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Ask HN: What are some fun projects to try out on a spare Linux file server?

207 points by lordleft 7y ago

I installed Kubuntu on an old PC and am currently using it as a remote dev environment & FTP server. Any other cool use-cases for a spare Linux box?

bristleworm 7y ago
If you plan to keep the server running you could run pihole on it.
- true_tuna 7y ago
  I run mine on a raspberry pi zero w. I wouldn’t waste the power of dedicating a whole server to it.
  - bristleworm 7y ago
    Me neither. My thoughts were: if the server already is running 24/7 for some other reason, you could put pihole on it as well.
larrysalibra 7y ago
plex, tor relay, bitcoin + lightning nodes
rafaquintanilha 7y ago
There was a recent thread with Raspberry Pi ideas that you might find useful: https://news.ycombinator.com/item?id=20264911 https://news.ycombinator.com/item?id=20264911
whalesalad 7y ago
Check these out: - reddit.com/r/homelab - reddit.com/r/homeserver I'd say the content on /r/homelab is about 33/33/33 distributed between 1. Masturbatory massive rigs at your home that consume thousands of watts of power but look cool and its fun to say you have a 10-node vSAN cluster next to your dehumidifier. 2. People who like to pirate content like its their job - setting up Plex and all the newsgroup/torrent apps to auto-pirate shows and movies. For a 13 year old, that can be cool. For an adult who clearly has the cash to spend on non-essential items and in a world where time is money: I do not get it. 3. People with an old PC running Kubuntu for a remote dev / FTP environment who want to do more cool shit with their gear! So as long as you enter the homelab reddit knowing this, you will have a better experience there. I definitely second Pihole. I might suggest experimenting with virtualization: so you can turn that single computer into 5 or 6. Tools like Proxmox or even just installing KVM and managing it with (https://virt-manager.org/ https://virt-manager.org/). You could Also look into running your own installation of Gitlab (although due to the footprint of the install, I might suggest keeping that isolated to a virtual machine)
- pbk1 7y ago
  Also worth checking out is reddit.com/r/selfhosted, which tends to be much less 'masturbatory' than /r/homelab
  - owlninja 7y ago
    > reddit.com/r/selfhosted I second this, very laid back with good information.
  - pickle-wizard 7y ago
    I didn't know about that sub. Thanks.
- klodolph 7y ago
  pbk1, your comment appears to be dead. You may have tripped some anti-spam filter because your account is relatively new and you have posted many links in your comments.
- oauea 7y ago
  > 2. People who like to pirate content like its their job - setting up Plex and all the newsgroup/torrent apps to auto-pirate shows and movies. For a 13 year old, that can be cool. For an adult who clearly has the cash to spend on non-essential items and in a world where time is money: I do not get it. It took me about an afternoon or two to set up, was fun to do, and now my favorite TV shows just appear in Plex for me to watch whenever I want to. Half of the time they're not available on Netflix either, so I'd have to figure out what streaming provider they're on, deal with their special websites, not get notifications when a new episode airs, etc. It's just a better experience.
  - kspp 7y ago
    Some people just need to find additional validation to prove to themselves they're doing the right thing. Don't worry about it. I have no idea what they're talking about though. Installing qBittorrent takes about a minute, adding an RSS feed one minute more; that's it. I think I configured my setup about two years ago, the files just magically appear in whatever directory I asked them to. How much more time does this consume compared to opening the web browser, going to <whatever streaming site>, and so on? I'd say, about 300% less. Edit: to whoever is reading this, after pressing the downvote/flag button, please do the following: set up a VPN to any third-world country, go to your favorite streaming provider, and have a gander at the breadth and diversity of their catalog.
teekert 7y ago
NextCloud FTW! Caldav, Carddav, Webdav, dropbox-replacement. What's not to like? Installed in a snap: sudo snap install nextcloud
jasonjayr 7y ago
Running home servers, I'm always worried about power use: 300 Watt(average)/1000 * 24 hr = 7.2 kw/hr per day 7.2 * 30 * $0.14 (roughly tax, generation + distribution in my area) ≈ $30/month to run the machine.
- proaralyst 7y ago
  My ancient 5-disk box uses an average of 60W. Modern hardware should pull even less.
- FlyingAvatar 7y ago
  Definitely something to consider, but unless you're running some old big iron hardware, 300 watts would be a very high average for a mostly idle server. I have a nearly 10 year old HP Microserver with 4 SATA disks and the average usage is less than 50 watts.
- JaimeThompson 7y ago
  Right now I have a R720 fully loaded with a mix of 16 SSD/HDDs, multiple Fusion-IO cards, 128GB+ ECC RAM, 10Gig Ethernet and when not under load it draws < 200 watts. If you get something like a R620 from ebay, assuming the US, you can get one that uses less power.
- thedanbob 7y ago
  One reason why I love my NUC. I have it running everything under the sun and it plus my networking gear draws 18 W. To be fair I haven't checked when it's under heavy load, but the internet says it shouldn't be more than around 35 W.
- rhinoceraptor 7y ago
  As others said, 300 watts is a ton of power, if you're actually using that much compute then you're probably getting your money's worth. My little pizza box R210 II PFSense router uses 30 watts (even though the PSU is 250), once I turned all the BIOS power settings down.
- penagwin 7y ago
  At least for me and I'm sure for some others it's a hobby and just kinda excepted the higher electricity cost as part of my hobby's expenses. And as the others said, at idle you'll be using a lot less power. That said you can run home servers with WAYYYY less power usage if you prefer. Single board computers are good bets, like the Raspberry pi 4 only use a max of ~15watts. Repurposed laptops have low power usage too.
akeck 7y ago
One of my favorite recent projects I've done was making a full wpa2 wifi access point with firewall out of a Raspberry Pi 3B. (Yes, I know the limitations of hardware. This was a "hold my beer" project.). If your old PC isn't too old and has virtualization instructions, you have a lot of fun with KVM for VMs and iSCSI for a SAN.
- nibalizer 7y ago
  I agree with trying to move more of the network functionality out of the ISP provided device and into home servers. A simple and cheap access point[1] can provide all the L1/L2 you need. Then you can run dns and dhcp inside Linux, configure firewall rules, segment your network, etc. The sky is the limit! Note: I reccomend a dedicated access point over hostapd because I had a lot of problems with it circa 3 years ago. [1] https://www.dell.com/en-us/work/shop/tp-link-tl-wa801nd-300mbps-access-point-wireless-access-point-80211b-g-n-24-ghz/apd/a8859068/networking https://www.dell.com/en-us/work/shop/tp-link-tl-wa801nd-300m...
thom 7y ago
I like to leave spare machines running chess engines to analyze openings etc. You could also leave it churning for days on end on various Kaggle competitions (especially if it had a relevant GPU). Could also get the thing scraping interesting datasets at a slow and respectful pace.
- vidar 7y ago
  Interested in the chess aspect, what do you do with the analysis when it completes?
  - thom 7y ago
    Often I'm just looking for some vaguely novel line in an opening that might be interesting to pursue in a game (I am not a strong player but love studying). I sometimes like seeing the difference in analysis between Stockish and Leela of real games (Magnus Carlsen attributes much of his recent form to trying to play more like AlphaZero with all sorts of positional pawn sacrifices etc). I've also tried to do some programmatic stuff around the analyses to automate things (i.e. find a move in a common line that nobody in my database has ever played but the computer says is best, or find lines where it looks like the opponent only has a single path through to stay in the game etc).
- cr0sh 7y ago
  > especially if it had a relevant GPU For basic learning on somewhat larger datasets (sub-TB), I have found that my 750 TI SC GPU has been very adequate; the only time I maxed it out was while doing "live training" of a tensorflow CNN from images generated from a driving simulator - so I was using part of the GPU for 3D rendering, and part of it for the training. This was for some "self-driving vehicle" experimentation... But running the model against the same simulation (that is, having the model drive instead of watching me drive and learning) actually used much less GPU; while I wasn't getting stellar frame rates in either case, they were adequate for the purpose. I'm just mentioning it, because many people assume you have to have a crazy amount of compute power with a GPU for ML tasks right off the bat (and the associated higher costs of such a system), when in reality that may not be the case (depending on what you are doing and how you are doing it), and you can get away a lesser system. Where I ran into problems with my GPU, though, was in the case of training using larger datasets (that is, non-streaming) - I couldn't fit them all in the GPU's memory (I think the card only has 1 GB), and so I had to do a batch system - and while it worked well, it was a lot slower because of shuffling data to and from the GPU. But for my learning purposes, it still did a fine job IMHO; of course, if I were doing such tasks for actual analysis or other "professional" (and paying) purposes, a better card would definitely be in order.
bluGill 7y ago
I have a freenas NAS at home. I mostly use it so that I can have one home directory (via nfs) on multiple computers. (Firefox sucks when doing this - if anyone works for mozilla - help). I want to extend this to open LDAP so that I can use one login to all computers (not so much for me, but the family). I have cups installed so that my printer needs only be setup once to work for all my machines. I'm thinking about putting my scanner on it as well (ideally I'd figure out how to use the buttons on the scanner making a copier), but since I never use my scanner this isn't really likely. As a file server this is the obvious place to put all your shared media, then use kodi https://kodi.tv/ https://kodi.tv/ or volumio https://volumio.org/ https://volumio.org/ or some other media center to share your media to all rooms. Setting this up is next on my list of projects, but so far I haven't got it working. Actually I had it working at my last house, but it was too hard to use so we didn't - let this serve as a lesion: make sure not only that it works, but that it is convenient to use. Using it as a central hub for your home automation is an idea. I've resisted so far because https://www.home-assistant.io/blog/2016/01/19/perfect-home-automation/ https://www.home-assistant.io/blog/2016/01/19/perfect-home-a... makes a good point: I can't come up with a use for home automation that isn't worse than what I have without it. My fundamental idea is I have one powerful, reliable, always-on machine. Anything that I want to run all the time should be on it. My other computers are only turned on when I want to do something on them.
- whatshisface 7y ago
  To solve your problem with Firefox, you might want to find their directory and symlink it to somewhere on a local drive.
  - bluGill 7y ago
    That makes setting up new systems a pain, and is user-hostile Users need to create a new profile for each new computer I buy. Firefox sync sortof works but I shouldn't need to store this data externally if I don't want to - and if I do want to it should still auto setup.
    - dijit 7y ago
LinuxBender 7y ago
It's a little time consuming to set up correctly and manage, but there is Ampache [1], for creating a scalable streaming music server that can be joined to others, so that catalogs are merged. It was created initially by a bunch of college kids (ok, they were college kids back then) at OSU and paid for with beer. [1] - https://github.com/ampache/ampache/ https://github.com/ampache/ampache/
- kuzimoto 7y ago
  It's really not too bad to setup, I promise! Windows is a pain right now, but Linux is pretty decent. I'm in the process of writing up a guide for setup on Windows for the Wiki, and will also do one for OSX, and a generic one for Linux. The Arch Wiki has a good guide already. It relies on a webserver, MySQL/MariaDB, and PHP, so a great project to try to get something useful running. Version 4 is going to be released soon and brings a lot of nice changes. I've been trying to update the Wiki to make sure content is up to date and isn't missing important information.
  - LinuxBender 7y ago
    In full disclosure, I only mentioned that because when I had last set it up, it took some tinkering to get it fully functional. That was a few years ago. I'm sure a lot of improvements have been made since then. It probably doesn't help that I tend to harden servers a bit.
    - kuzimoto 7y ago
      No worries, I just wanted to make sure people wouldn't get scared off too easily ;)
- jesterson 7y ago
  This. I have Ampache set up in my cloud server, data storage mounted from my house. Works like a charm. Also amazing play:Sub iOS app (https://apps.apple.com/us/app/play-sub-music-streamer/id955329386 https://apps.apple.com/us/app/play-sub-music-streamer/id9553...) supports Ampache API and has quite decent UI. All this allows me to have my music anywhere I go
EamonnMR 7y ago
https://www.plex.tv/ https://www.plex.tv/
spork12 7y ago
You could setup a honeypot and mess with hackers.
eswat 7y ago
I have my Pi set up with Pi-hole and an IRC bouncer.
zelon88 7y ago
Low power 'buntu home servers are my jam. I've got a few open-source projects that you can plug right into a LAMP stack that you might be interested in... [1] https://github.com/zelon88/HRCloud2 https://github.com/zelon88/HRCloud2 [2] https://github.com/zelon88/HRConvert2 https://github.com/zelon88/HRConvert2 [3] https://github.com/zelon88/HRScan2 https://github.com/zelon88/HRScan2
BossingAround 7y ago
Deploy a single-node kubernetes instance and learn some containers/dev-ops to put on your CV, that'd be my advice.
- true_tuna 7y ago
  Don’t expose it to the internet please. Or if you do make sure you know how to secure it first.
aetherith 7y ago
I've had a ton of fun with setting up FreeIPA [1] to do LDAP/Kerberos for single sign-on. It's a primarily RH project but I think they have a working server implementation for Ubuntu and derivatives. [1]https://www.freeipa.org/page/Main_Page https://www.freeipa.org/page/Main_Page
- dundercoder 7y ago
  I set this up 4 or 5 years ago, has it gotten easier since then? Specifically TOTP was rough.
  - elcritch 7y ago
    Try out the free version of the Univention server. It’s pretty easy with ldap and active directory running out of the box, but you have to KVM it. 1: https://www.univention.com/products/ucs/ https://www.univention.com/products/ucs/
ohiovr 7y ago
You can install bind on it to serve your own dns, or wireguard vpn so you don’t get pwnd in a coffee shop. You could get dnsmasq going so you can give your lan computers proper domain names though it might not play nice with bind if it is on the same server.
gzu 7y ago
If its built out of a conventional pc, wipe it and install proxmox on an SSD. With that you can virtualize a openmediavault NAS instance then have spare for spare Linux/windows VM instances, Pihole VM, Nextcloud, etc
saxonww 7y ago
Familiarize with other distributions/operating systems: nixos, one of the bsds, etc.
giomasce 7y ago
If you are close to a window and willing to buy a receiver, install dump1090 and feed to FlightAware and FlightRadar24.
NickBusey 7y ago
Check out HomelabOS to help install a bunch of services that can be useful to have on a file server. Many of them are mentioned elsewhere in this thread. It currently has over 50 services you can optionally enable. The idea is you download it, you run `make`, it asks you a few questions, and then you have a working Dockerized deployment configured via Ansible, with versionable configuration. https://gitlab.com/NickBusey/HomelabOS https://gitlab.com/NickBusey/HomelabOS
sirwitti 7y ago
Gitlab and NextCloud are pretty cool. With NC you can quite easily host your own calendar and contacts.
moviuro 7y ago
Along with all other suggestions: - Syncthing node https://syncthing.org https://syncthing.org ; - WireGuard server https://wireguard.com https://wireguard.com ; - Pi-hole or just lying DNS Server https://pi-hole.net https://pi-hole.net, https://gitlab.com/moviuro/moviuro.bin/blob/master/lie-to-me https://gitlab.com/moviuro/moviuro.bin/blob/master/lie-to-me ; - Nextcloud https://nextcloud.com/ https://nextcloud.com/ ; - Your own little blog/site with https (LetsEncrypt), nginx, etc.
- greggyb 7y ago
  Last item (blog/site) could run afoul of ISP terms. I would double check before hosting anything public.
  - Apotheos 7y ago
    I'm actually doing this right now, and it should be fine as long as you use a service that offers dynamic DNS. If your ISP changes your IP, the dynamic DNS service will automatically point to the new IP. Namecheap offers this when you buy a domain through them.
  - henryfjordan 7y ago
    I have Spectrum and I just checked, it is Prohibited to: > Running any type of server on the system that is not consistent with personal, residential use. This includes but is not limited to FTP, IRC, SMTP, POP, HTTP, SOCS, SQUID, NTP, DNS or any multi-user forums. That said, I run a small stack of personal stuff, including a public resume-style site, and I've never heard a peep from them. Because there's nothing commercial I feel like I could make an argument my site is "residential". I did have my server pwned once though (I came home and it was very clear from the fan intensity that it was mining bitcoin) so I'm not sure I'd recommend it to anyone.
    - sucrose 7y ago
      My Synology luckily was never pwned, but there were millions of attempts. Noticed higher than usual traffic one day, opened the access logs and found someone attempting to brute-force the SSH credentials... unfortunately for them I don't use passwords, only certs for authentication.
mnajiri 7y ago
أفضل المواقع العربية لمشاهدة وتحميل المسلسلات والافلام https://mdwab.blogspot.com/2019/05/Best-site-films-Series.html https://mdwab.blogspot.com/2019/05/Best-site-films-Series.ht...
tombert 7y ago
My latest project has been to start ripping my entire blu-ray and DVD collection (which is massive), and using Emby to serve them. Since I didn't want my laptop to overheat by compressing the video, I wrote a script to transcode files on my server to a smaller size once the ripping is done. It's a little different, since my "server" is actually six ODroid XU4's glued together with Docker Swarm and NFS, but it wouldn't be hard to adapt for your thing. I'd be happy to share that script if you'd like but it's not terribly elaborate.
- umvi 7y ago
  So do your machines just idle or do you have a way to put them to sleep and only wake/poweron if someone actually wants to watch a movie? I had a Plex server running on a spare machine, but I found I only used it once a week or so (Friday/Saturday nights) and the rest of the time it was just wasting energy.
  - cannonedhamster 7y ago
    If you only use Plex infrequently it can be a bit of a power waster for a standalone server. But one of the really cool things about Plex is photo backups from your mobile devices. If you'd rather not have them up in a third party, then it's a really great solution. Also Plex has streaming audio options, though it could be better with audiobooks. My storage array for Plex is in the same place as my home back up so it's never really wasted for me since I store all my files in one location and just open them at whatever computer I'm at.
  - tombert 7y ago
    The ODroids peak at ~20W of power each, and idle at a lot less. All six together, at peak will be ~120W, which isn't so bad, and it seems to idle at around ~40W, which is a number I'm ok with, especially since these things live deep in my basement, far away from the AC, meaning that the heat they generate at least isn't being re-cooled. That said, I also use these things for a whole ton of things; I watch a lot of movies on there, but since I use docker swarm liberally, pretty much any pet project I have gets deployed there. For example, and I forgot to mention this in the previous post, I built my own basic home-security system by using ffmpeg with a bunch of webcams and Raspberry Pi Zero W's, which communicates to a docker container that streams HLS to hard disk. Of course I could probably get away with turning these servers on at an as-needed level, but I like being able to just spin up a container whenever I want.
josteink 7y ago
Get to know ZFS.
rocky1138 7y ago
I've got an old HP laptop running a pihole-alike, boinc, syncthing, and a webcam capture from my window: https://johnrockefeller.net/guelph-webcam https://johnrockefeller.net/guelph-webcam. In addition, I also host local files in a temporary way so other machines in my home network can pick them up easily with `php -s`. Running a home server on an old laptop is very useful. If you're worried about power usage, just set the CPU to the lowest MHz like I did. If you're doing it, please don't forget to look at boinc, because they need all the help they can get with computing power.
- emilburzo 7y ago
  How do you get such a glare-free image behind a window?
  - rocky1138 7y ago
    I hot glued the camera to the glass so there is no air gap.
rhinoceraptor 7y ago
A couple things I find useful: - ZFS fileshare - Plex Server - Time Machine server for Macs - CUPS server, my printer is old and requires drivers, so now I can print from my phone and computers without drivers - Run your own IRC bouncer if you're into that kind of thing - Run a seedbox, just for Linux ISOs of course :)
- callmeal 7y ago
  >- Plex Server I had to stop using plex after they insisted on knowing everything I was watching. Mine runs pihole, a print-server, and a fileserver for kodi now.
godshatter 7y ago
Run a freenet node, or setup a YaCy node, or some other network node. An always-on network node for projects like those can really benefit them.
true_tuna 7y ago
I set up a gitlab ci/cd server. It was fun, just the right about of challenging. Although gitlab has free hosted accounts so maybe not too useful.
cr0sh 7y ago
For a while I ran a box as a combo LAMP and ZoneMinder server; I ended up shutting it down as I wasn't using the LAMP server much any longer, and ZoneMinder was overkill for my purposes... ...but if you've never played around with a security camera system like ZoneMinder allows for, it can be an interesting experience. Like I said, complete overkill for my home security camera system - but it would be perfect if you set it up like an appliance, on a beefy system - because it needs a lot of CPU to process frames and such - and you have a lot of cameras to work with. You can hook up virtually any kind of camera; from a simple USB webcam (heck, you could probably even get a parallel port black and white quickcam to work if you were crazy enough), to a set of cameras on a multi-input video digitizer card, to a full-on professional level PTZ (pan-tilt-zoom) camera (with PTZ control!). It is fairly complex to set up properly; one could easily create a business around it selling turnkey camera security appliances if one wanted to, I believe - though I don't think I've seen any such business like that (unlike how there are/were tons of companies doing VOIP using custom Asterisk systems). The whole application is written (IIRC) in Python; I don't recall what it uses for the video processing (whether OpenCV or some other library). It uses multiple processes to handle everything (it isn't a monolithic system), so it is fairly robust. But as I mentioned, the more cameras/video streams you have (and the higher resolution those cameras are), the more CPU you need to process everything. I'm not sure if there is a hard limit, or a way to segregate things across multiple systems (ie - some kind of clustering?); I think you can specify a separate DB server... Anyhow - it's something different; I had it at one time running on a PII-350 with 64 Mb of RAM years ago - the last machine, IIRC, was a P4-933 with 256 Mb of RAM - and I could process a couple of streams of 640x480 color video from a couple of IP cameras (all I needed for my home system). But that was the limit for that machine. A more modern machine would probably work much better.
hestefisk 7y ago
Install Asterisk and run your own home PBX using SIP.
PopeDotNinja 7y ago
If you're interested in learning about Systemd, you could service that runs in the background. Here's an an example of a Slack it I wrote... A couple years ago & at the last minute, I needed to cover for a sys admin on a new, complicated system that didn't yet have much automation or monitoring. I only got 2 hours of instruction before he needed to disappear for two weeks. We had a status page that showed the status of services, but it wasn't wired to email alerts, PagerDuty, etc. I really didn't want to keep staring at the status page. So I wrote a simple bash script that curled the status page once per minute. Then the script grep-ed thru the html looking for a line that indicated there was a critical failure. Finally, I did a curl post request to a slack channel that said "the servers are on fire" if there was something to report, and occasionally posted a "the servers are not on fire" if everything was fine. It was a great hack that made life easier while I learned how to properly manage the system, and help with wiring up the monitoring. It was pretty quick to write, too!
cr0sh 7y ago
It's been mentioned in passing form a few times, but if the machine is decent enough (cpu and ram), you might consider setting it up to run and learn Docker or some other virtualization/container system.
malceore1 7y ago
I would sugguest: 1. CUPS print server 2. Pihole 3. Automated Backup storage 4. Network Storage with Samba At home I use Mozilla Webthings gateway but running on Lubuntu Server instead of the sugguested Raspberry Pi. I even host a local only voice assistant that leverages Gateway to control device states. https://hacks.mozilla.org/2019/04/introducing-mozilla-webthings/ https://hacks.mozilla.org/2019/04/introducing-mozilla-webthi...
moduspwnens14 7y ago
If you haven't learned Kubernetes yet, it's probably a good use case for that. Then use any of the other ideas here, except deploy them through Kubernetes.
jolmg 7y ago
Just to see what happens, it might be cool to find a way to safely (as in without compromising your local network) provide root read, write and execute access to the whole anonymous, public internet while still being able to fully inspect everything that people (and bots) do. Maybe you can set an "intranet" of virtual machines to also see how people/bots move around the network. Kind of like: https://www.xkcd.com/350/ https://www.xkcd.com/350/
- somepig 7y ago
  expect a bricked firmware and/or child porn repository within 72 hours
  - jolmg 7y ago
    Ha. Would people really do that? I honestly don't know what to expect. Maybe bitcoin mining? Anyway, if we're talking about fun, I can't think of anything more exciting than seeing what happens in this scenario. I imagine the way you expose it makes a difference, too, in what kind of people you attract.
    - snazz 7y ago
      I don’t think you need to expose it—a root account with “password” as the password and open SSH on port 22 would do the trick.
      - dddddaviddddd 7y ago
        With adequate traffic filtering/limitations and VM snapshots, could be interesting.
        theossuary 7y ago
        Buy a second internet connection from your ISP if you're going to do that.
asoltys83 7y ago
run a sia node: https://sia.tech/ https://sia.tech/
lawrencegs 7y ago
If you have tons of space, how about running a blockchain node? Something like FileCoin node is interesting because you can theoretically made some tokens when you’re doing it.
gigama 7y ago
Running a Folding@Home client is a helpful way to contribute spare CPU cycles to science... https://foldingathome.org/ https://foldingathome.org/
smivan 7y ago
I wrote an article about this exact question: https://blog.ivansmirnov.name/what-can-you-do-with-a-personal-server/ https://blog.ivansmirnov.name/what-can-you-do-with-a-persona... Some new tech that hasn't made it on the list yet: - https://github.com/issmirnov/zap https://github.com/issmirnov/zap - recursive URL expander, can be run at DNS level. Ie, "n/" -> "https://news.ycombinator.com/" https://news.ycombinator.com/" or "f/g/homelab" -> facebook.com/groups/homelab - netdata - https://concourse-ci.org/ https://concourse-ci.org/ - https://varnish-cache.org/intro/ https://varnish-cache.org/intro/ - AFP/NFS/samba for file sharing - https://github.com/janeczku/calibre-web https://github.com/janeczku/calibre-web - web UI for calibre ebooks - https://jupyter.org/ https://jupyter.org/ for python scripts and web scraping - https://github.com/cdr/code-server https://github.com/cdr/code-server for an IDE in a tab. - https://www.portainer.io/ https://www.portainer.io/ if you use docker - https://yourls.org/ https://yourls.org/ for a private URL shortener in your home
gsliepen 7y ago
Run a mirror for your favorite projects. This can be for individual programs, or for whole repositories of data like the Debian archive or Wikipedia. Please do check with whatever project you are mirroring if they are OK with it (in case bandwidth will be significant) and what the best practices are that they recommend.
wdroz 7y ago
DNS tunnel "server" using iodine https://github.com/yarrick/iodine https://github.com/yarrick/iodine "Free" Wifi in the whole world after that as most AP allow DNS requests.
- sandinmyjoints 7y ago
  I tried to do this about a year ago on an Ubuntu DO Droplet with a static public IP to point the NS record to and I never could get it to work. Even tried this fork which has a few more commits than upstream: https://github.com/advoryanskiy/iodine https://github.com/advoryanskiy/iodine So are you running this successfully? Mind sharing your stack and hosting environment?
  - wdroz 7y ago
    With fresh Ubuntu 18.04, I just installed some packages to be able to run `make` without issues. I did exactly the same as stated in the README t1 IN NS t1ns.mydomain.com. ; note the dot! t1ns IN A 10.15.213.99 I configured these entries from the domain provider directly. Then I use proxychains with a sock tunnel (ssh -D ...) to run whatever I want through the tunnel.
jedberg 7y ago
rm -rf /bin Then try to recover from it.
ChuckMcM 7y ago
I used an old VAX for a while connected to full frontal internet with a Telnet port available. One of the cool things VMS had was a way to mirror the session from one terminal on another. It would watch while script kiddies would try to break in, only to be confused about what it was they had broken into when they succeeded. I'm sure you could do something like this by running VMS on simh and a vlan/pty and use your modem's port routing nat feature to send it telnet traffic. My go to "spare Linux server" environment has been RasPis for a while though since headless they are pretty cheap, with an actual x86 there are perhaps some interesting PCIe, PCI ,or ISA cards (depends on how old it is) that are fun. Setting it up as a media transfer station to move things off 5.25" floppy or 3.5" floppy or Zip disks or something can be a fun use as well.
grahamburger 7y ago
Matrix and Mastodon are kinda fun, and federated so you can join a community even if it's just you on your server.
peterbmarks 7y ago
Ever since Google Reader was killed I've run a https://tt-rss.org https://tt-rss.org server.
crobertsbmw 7y ago
Fork bomb. Seriously, it’s a fun learning excersize.
- scottydelta 7y ago
  Many years ago I was in a course which had a lab. We would log onto linux machines with network based login(kerberos IIRC). Once logged in, you could also ssh into a server available to us for running codes(limited access). One day while the lab was in session, I was just playing with stuff and tried executing a fork bomb on the server. The moment I executed the fork bomb, all the 120 machines in the lab became unresponsive, including mine. I didnt realize at that time that they were using the same server for code execution as well as auth server. No one knew what happened and the class was dismissed.
tenebrisalietum 7y ago
- FreshRSS; get all your RSS feeds remotely in one spot. - OnlyOffice; this is basically an open-source version of Google Docs. It's rather heavyweight - you will need 2 hosts for this to run and the install uses many varied components, so this is a great opportunity to work with virtualization or containerization. - EtherCalc; a shared spreadsheet, much easier to setup than OnlyOffice. - WARCproxy; record your web browsing to a WARC archive and play it back later. - Install nginx, setup a 64GB VM, install a graphical Linux desktop on it, and use NoVNC and nginx websockets to allow external access to it. - Play with Yacy, a search engine. - Seed some Debian torrents and help out the community.
jamieweb 7y ago
Rosetta@Home - perform medical research using your spare CPU cycles.
T3RMINATED 7y ago
microsoft windows trumps linux so stop going to linux just use windows 10
decentralizer 7y ago
Hosting a Tor relay. Also if you contribute to network with at least 500 KBytes/s internet speed, you get a Tor T-shirt after 60 days.
quickthrower2 7y ago
A Kubernetes Node. An elastic search for whatever you fancy searching

207 points by lordleft 7y ago

I installed Kubuntu on an old PC and am currently using it as a remote dev environment & FTP server. Any other cool use-cases for a spare Linux box?

bristleworm 7y ago

If you plan to keep the server running you could run pihole on it.

true_tuna 7y ago
I run mine on a raspberry pi zero w. I wouldn’t waste the power of dedicating a whole server to it.
- bristleworm 7y ago
  Me neither. My thoughts were: if the server already is running 24/7 for some other reason, you could put pihole on it as well.

larrysalibra 7y ago

plex, tor relay, bitcoin + lightning nodes

rafaquintanilha 7y ago

There was a recent thread with Raspberry Pi ideas that you might find useful: https://news.ycombinator.com/item?id=20264911 https://news.ycombinator.com/item?id=20264911

whalesalad 7y ago

Check these out: - reddit.com/r/homelab - reddit.com/r/homeserver I'd say the content on /r/homelab is about 33/33/33 distributed between 1. Masturbatory massive rigs at your home that consume thousands of watts of power but look cool and its fun to say you have a 10-node vSAN cluster next to your dehumidifier. 2. People who like to pirate content like its their job - setting up Plex and all the newsgroup/torrent apps to auto-pirate shows and movies. For a 13 year old, that can be cool. For an adult who clearly has the cash to spend on non-essential items and in a world where time is money: I do not get it. 3. People with an old PC running Kubuntu for a remote dev / FTP environment who want to do more cool shit with their gear! So as long as you enter the homelab reddit knowing this, you will have a better experience there. I definitely second Pihole. I might suggest experimenting with virtualization: so you can turn that single computer into 5 or 6. Tools like Proxmox or even just installing KVM and managing it with (https://virt-manager.org/ https://virt-manager.org/). You could Also look into running your own installation of Gitlab (although due to the footprint of the install, I might suggest keeping that isolated to a virtual machine)

pbk1 7y ago
Also worth checking out is reddit.com/r/selfhosted, which tends to be much less 'masturbatory' than /r/homelab
- owlninja 7y ago
  > reddit.com/r/selfhosted I second this, very laid back with good information.
- pickle-wizard 7y ago
  I didn't know about that sub. Thanks.
klodolph 7y ago
pbk1, your comment appears to be dead. You may have tripped some anti-spam filter because your account is relatively new and you have posted many links in your comments.
oauea 7y ago
> 2. People who like to pirate content like its their job - setting up Plex and all the newsgroup/torrent apps to auto-pirate shows and movies. For a 13 year old, that can be cool. For an adult who clearly has the cash to spend on non-essential items and in a world where time is money: I do not get it. It took me about an afternoon or two to set up, was fun to do, and now my favorite TV shows just appear in Plex for me to watch whenever I want to. Half of the time they're not available on Netflix either, so I'd have to figure out what streaming provider they're on, deal with their special websites, not get notifications when a new episode airs, etc. It's just a better experience.
- kspp 7y ago
  Some people just need to find additional validation to prove to themselves they're doing the right thing. Don't worry about it. I have no idea what they're talking about though. Installing qBittorrent takes about a minute, adding an RSS feed one minute more; that's it. I think I configured my setup about two years ago, the files just magically appear in whatever directory I asked them to. How much more time does this consume compared to opening the web browser, going to <whatever streaming site>, and so on? I'd say, about 300% less. Edit: to whoever is reading this, after pressing the downvote/flag button, please do the following: set up a VPN to any third-world country, go to your favorite streaming provider, and have a gander at the breadth and diversity of their catalog.

teekert 7y ago

NextCloud FTW! Caldav, Carddav, Webdav, dropbox-replacement. What's not to like? Installed in a snap: sudo snap install nextcloud

jasonjayr 7y ago

Running home servers, I'm always worried about power use: 300 Watt(average)/1000 * 24 hr = 7.2 kw/hr per day 7.2 * 30 * $0.14 (roughly tax, generation + distribution in my area) ≈ $30/month to run the machine.

proaralyst 7y ago
My ancient 5-disk box uses an average of 60W. Modern hardware should pull even less.
FlyingAvatar 7y ago
Definitely something to consider, but unless you're running some old big iron hardware, 300 watts would be a very high average for a mostly idle server. I have a nearly 10 year old HP Microserver with 4 SATA disks and the average usage is less than 50 watts.
JaimeThompson 7y ago
Right now I have a R720 fully loaded with a mix of 16 SSD/HDDs, multiple Fusion-IO cards, 128GB+ ECC RAM, 10Gig Ethernet and when not under load it draws < 200 watts. If you get something like a R620 from ebay, assuming the US, you can get one that uses less power.
thedanbob 7y ago
One reason why I love my NUC. I have it running everything under the sun and it plus my networking gear draws 18 W. To be fair I haven't checked when it's under heavy load, but the internet says it shouldn't be more than around 35 W.
rhinoceraptor 7y ago
As others said, 300 watts is a ton of power, if you're actually using that much compute then you're probably getting your money's worth. My little pizza box R210 II PFSense router uses 30 watts (even though the PSU is 250), once I turned all the BIOS power settings down.
penagwin 7y ago
At least for me and I'm sure for some others it's a hobby and just kinda excepted the higher electricity cost as part of my hobby's expenses. And as the others said, at idle you'll be using a lot less power. That said you can run home servers with WAYYYY less power usage if you prefer. Single board computers are good bets, like the Raspberry pi 4 only use a max of ~15watts. Repurposed laptops have low power usage too.

akeck 7y ago

One of my favorite recent projects I've done was making a full wpa2 wifi access point with firewall out of a Raspberry Pi 3B. (Yes, I know the limitations of hardware. This was a "hold my beer" project.). If your old PC isn't too old and has virtualization instructions, you have a lot of fun with KVM for VMs and iSCSI for a SAN.

nibalizer 7y ago
I agree with trying to move more of the network functionality out of the ISP provided device and into home servers. A simple and cheap access point[1] can provide all the L1/L2 you need. Then you can run dns and dhcp inside Linux, configure firewall rules, segment your network, etc. The sky is the limit! Note: I reccomend a dedicated access point over hostapd because I had a lot of problems with it circa 3 years ago. [1] https://www.dell.com/en-us/work/shop/tp-link-tl-wa801nd-300mbps-access-point-wireless-access-point-80211b-g-n-24-ghz/apd/a8859068/networking https://www.dell.com/en-us/work/shop/tp-link-tl-wa801nd-300m...

thom 7y ago

I like to leave spare machines running chess engines to analyze openings etc. You could also leave it churning for days on end on various Kaggle competitions (especially if it had a relevant GPU). Could also get the thing scraping interesting datasets at a slow and respectful pace.

vidar 7y ago
Interested in the chess aspect, what do you do with the analysis when it completes?
- thom 7y ago
  Often I'm just looking for some vaguely novel line in an opening that might be interesting to pursue in a game (I am not a strong player but love studying). I sometimes like seeing the difference in analysis between Stockish and Leela of real games (Magnus Carlsen attributes much of his recent form to trying to play more like AlphaZero with all sorts of positional pawn sacrifices etc). I've also tried to do some programmatic stuff around the analyses to automate things (i.e. find a move in a common line that nobody in my database has ever played but the computer says is best, or find lines where it looks like the opponent only has a single path through to stay in the game etc).
cr0sh 7y ago
> especially if it had a relevant GPU For basic learning on somewhat larger datasets (sub-TB), I have found that my 750 TI SC GPU has been very adequate; the only time I maxed it out was while doing "live training" of a tensorflow CNN from images generated from a driving simulator - so I was using part of the GPU for 3D rendering, and part of it for the training. This was for some "self-driving vehicle" experimentation... But running the model against the same simulation (that is, having the model drive instead of watching me drive and learning) actually used much less GPU; while I wasn't getting stellar frame rates in either case, they were adequate for the purpose. I'm just mentioning it, because many people assume you have to have a crazy amount of compute power with a GPU for ML tasks right off the bat (and the associated higher costs of such a system), when in reality that may not be the case (depending on what you are doing and how you are doing it), and you can get away a lesser system. Where I ran into problems with my GPU, though, was in the case of training using larger datasets (that is, non-streaming) - I couldn't fit them all in the GPU's memory (I think the card only has 1 GB), and so I had to do a batch system - and while it worked well, it was a lot slower because of shuffling data to and from the GPU. But for my learning purposes, it still did a fine job IMHO; of course, if I were doing such tasks for actual analysis or other "professional" (and paying) purposes, a better card would definitely be in order.

bluGill 7y ago

I have a freenas NAS at home. I mostly use it so that I can have one home directory (via nfs) on multiple computers. (Firefox sucks when doing this - if anyone works for mozilla - help). I want to extend this to open LDAP so that I can use one login to all computers (not so much for me, but the family). I have cups installed so that my printer needs only be setup once to work for all my machines. I'm thinking about putting my scanner on it as well (ideally I'd figure out how to use the buttons on the scanner making a copier), but since I never use my scanner this isn't really likely. As a file server this is the obvious place to put all your shared media, then use kodi https://kodi.tv/ https://kodi.tv/ or volumio https://volumio.org/ https://volumio.org/ or some other media center to share your media to all rooms. Setting this up is next on my list of projects, but so far I haven't got it working. Actually I had it working at my last house, but it was too hard to use so we didn't - let this serve as a lesion: make sure not only that it works, but that it is convenient to use. Using it as a central hub for your home automation is an idea. I've resisted so far because https://www.home-assistant.io/blog/2016/01/19/perfect-home-automation/ https://www.home-assistant.io/blog/2016/01/19/perfect-home-a... makes a good point: I can't come up with a use for home automation that isn't worse than what I have without it. My fundamental idea is I have one powerful, reliable, always-on machine. Anything that I want to run all the time should be on it. My other computers are only turned on when I want to do something on them.

whatshisface 7y ago
To solve your problem with Firefox, you might want to find their directory and symlink it to somewhere on a local drive.
- bluGill 7y ago
  That makes setting up new systems a pain, and is user-hostile Users need to create a new profile for each new computer I buy. Firefox sync sortof works but I shouldn't need to store this data externally if I don't want to - and if I do want to it should still auto setup.
  - dijit 7y ago

LinuxBender 7y ago

It's a little time consuming to set up correctly and manage, but there is Ampache [1], for creating a scalable streaming music server that can be joined to others, so that catalogs are merged. It was created initially by a bunch of college kids (ok, they were college kids back then) at OSU and paid for with beer. [1] - https://github.com/ampache/ampache/ https://github.com/ampache/ampache/

kuzimoto 7y ago
It's really not too bad to setup, I promise! Windows is a pain right now, but Linux is pretty decent. I'm in the process of writing up a guide for setup on Windows for the Wiki, and will also do one for OSX, and a generic one for Linux. The Arch Wiki has a good guide already. It relies on a webserver, MySQL/MariaDB, and PHP, so a great project to try to get something useful running. Version 4 is going to be released soon and brings a lot of nice changes. I've been trying to update the Wiki to make sure content is up to date and isn't missing important information.
- LinuxBender 7y ago
  In full disclosure, I only mentioned that because when I had last set it up, it took some tinkering to get it fully functional. That was a few years ago. I'm sure a lot of improvements have been made since then. It probably doesn't help that I tend to harden servers a bit.
  - kuzimoto 7y ago
    No worries, I just wanted to make sure people wouldn't get scared off too easily ;)
jesterson 7y ago
This. I have Ampache set up in my cloud server, data storage mounted from my house. Works like a charm. Also amazing play:Sub iOS app (https://apps.apple.com/us/app/play-sub-music-streamer/id955329386 https://apps.apple.com/us/app/play-sub-music-streamer/id9553...) supports Ampache API and has quite decent UI. All this allows me to have my music anywhere I go

EamonnMR 7y ago

https://www.plex.tv/ https://www.plex.tv/

spork12 7y ago

You could setup a honeypot and mess with hackers.

eswat 7y ago

I have my Pi set up with Pi-hole and an IRC bouncer.

zelon88 7y ago

Low power 'buntu home servers are my jam. I've got a few open-source projects that you can plug right into a LAMP stack that you might be interested in... [1] https://github.com/zelon88/HRCloud2 https://github.com/zelon88/HRCloud2 [2] https://github.com/zelon88/HRConvert2 https://github.com/zelon88/HRConvert2 [3] https://github.com/zelon88/HRScan2 https://github.com/zelon88/HRScan2

BossingAround 7y ago

Deploy a single-node kubernetes instance and learn some containers/dev-ops to put on your CV, that'd be my advice.

true_tuna 7y ago
Don’t expose it to the internet please. Or if you do make sure you know how to secure it first.

aetherith 7y ago

I've had a ton of fun with setting up FreeIPA [1] to do LDAP/Kerberos for single sign-on. It's a primarily RH project but I think they have a working server implementation for Ubuntu and derivatives. [1]https://www.freeipa.org/page/Main_Page https://www.freeipa.org/page/Main_Page

dundercoder 7y ago
I set this up 4 or 5 years ago, has it gotten easier since then? Specifically TOTP was rough.
- elcritch 7y ago
  Try out the free version of the Univention server. It’s pretty easy with ldap and active directory running out of the box, but you have to KVM it. 1: https://www.univention.com/products/ucs/ https://www.univention.com/products/ucs/

ohiovr 7y ago

You can install bind on it to serve your own dns, or wireguard vpn so you don’t get pwnd in a coffee shop. You could get dnsmasq going so you can give your lan computers proper domain names though it might not play nice with bind if it is on the same server.

gzu 7y ago

If its built out of a conventional pc, wipe it and install proxmox on an SSD. With that you can virtualize a openmediavault NAS instance then have spare for spare Linux/windows VM instances, Pihole VM, Nextcloud, etc

saxonww 7y ago

Familiarize with other distributions/operating systems: nixos, one of the bsds, etc.

giomasce 7y ago

If you are close to a window and willing to buy a receiver, install dump1090 and feed to FlightAware and FlightRadar24.

NickBusey 7y ago

Check out HomelabOS to help install a bunch of services that can be useful to have on a file server. Many of them are mentioned elsewhere in this thread. It currently has over 50 services you can optionally enable. The idea is you download it, you run `make`, it asks you a few questions, and then you have a working Dockerized deployment configured via Ansible, with versionable configuration. https://gitlab.com/NickBusey/HomelabOS https://gitlab.com/NickBusey/HomelabOS

sirwitti 7y ago

Gitlab and NextCloud are pretty cool. With NC you can quite easily host your own calendar and contacts.

moviuro 7y ago

Along with all other suggestions: - Syncthing node https://syncthing.org https://syncthing.org ; - WireGuard server https://wireguard.com https://wireguard.com ; - Pi-hole or just lying DNS Server https://pi-hole.net https://pi-hole.net, https://gitlab.com/moviuro/moviuro.bin/blob/master/lie-to-me https://gitlab.com/moviuro/moviuro.bin/blob/master/lie-to-me ; - Nextcloud https://nextcloud.com/ https://nextcloud.com/ ; - Your own little blog/site with https (LetsEncrypt), nginx, etc.

greggyb 7y ago
Last item (blog/site) could run afoul of ISP terms. I would double check before hosting anything public.
- Apotheos 7y ago
  I'm actually doing this right now, and it should be fine as long as you use a service that offers dynamic DNS. If your ISP changes your IP, the dynamic DNS service will automatically point to the new IP. Namecheap offers this when you buy a domain through them.
- henryfjordan 7y ago
  I have Spectrum and I just checked, it is Prohibited to: > Running any type of server on the system that is not consistent with personal, residential use. This includes but is not limited to FTP, IRC, SMTP, POP, HTTP, SOCS, SQUID, NTP, DNS or any multi-user forums. That said, I run a small stack of personal stuff, including a public resume-style site, and I've never heard a peep from them. Because there's nothing commercial I feel like I could make an argument my site is "residential". I did have my server pwned once though (I came home and it was very clear from the fan intensity that it was mining bitcoin) so I'm not sure I'd recommend it to anyone.
  - sucrose 7y ago
    My Synology luckily was never pwned, but there were millions of attempts. Noticed higher than usual traffic one day, opened the access logs and found someone attempting to brute-force the SSH credentials... unfortunately for them I don't use passwords, only certs for authentication.

mnajiri 7y ago

أفضل المواقع العربية لمشاهدة وتحميل المسلسلات والافلام https://mdwab.blogspot.com/2019/05/Best-site-films-Series.html https://mdwab.blogspot.com/2019/05/Best-site-films-Series.ht...

tombert 7y ago

My latest project has been to start ripping my entire blu-ray and DVD collection (which is massive), and using Emby to serve them. Since I didn't want my laptop to overheat by compressing the video, I wrote a script to transcode files on my server to a smaller size once the ripping is done. It's a little different, since my "server" is actually six ODroid XU4's glued together with Docker Swarm and NFS, but it wouldn't be hard to adapt for your thing. I'd be happy to share that script if you'd like but it's not terribly elaborate.

umvi 7y ago
So do your machines just idle or do you have a way to put them to sleep and only wake/poweron if someone actually wants to watch a movie? I had a Plex server running on a spare machine, but I found I only used it once a week or so (Friday/Saturday nights) and the rest of the time it was just wasting energy.
- cannonedhamster 7y ago
  If you only use Plex infrequently it can be a bit of a power waster for a standalone server. But one of the really cool things about Plex is photo backups from your mobile devices. If you'd rather not have them up in a third party, then it's a really great solution. Also Plex has streaming audio options, though it could be better with audiobooks. My storage array for Plex is in the same place as my home back up so it's never really wasted for me since I store all my files in one location and just open them at whatever computer I'm at.
- tombert 7y ago
  The ODroids peak at ~20W of power each, and idle at a lot less. All six together, at peak will be ~120W, which isn't so bad, and it seems to idle at around ~40W, which is a number I'm ok with, especially since these things live deep in my basement, far away from the AC, meaning that the heat they generate at least isn't being re-cooled. That said, I also use these things for a whole ton of things; I watch a lot of movies on there, but since I use docker swarm liberally, pretty much any pet project I have gets deployed there. For example, and I forgot to mention this in the previous post, I built my own basic home-security system by using ffmpeg with a bunch of webcams and Raspberry Pi Zero W's, which communicates to a docker container that streams HLS to hard disk. Of course I could probably get away with turning these servers on at an as-needed level, but I like being able to just spin up a container whenever I want.

josteink 7y ago

Get to know ZFS.

rocky1138 7y ago

I've got an old HP laptop running a pihole-alike, boinc, syncthing, and a webcam capture from my window: https://johnrockefeller.net/guelph-webcam https://johnrockefeller.net/guelph-webcam. In addition, I also host local files in a temporary way so other machines in my home network can pick them up easily with `php -s`. Running a home server on an old laptop is very useful. If you're worried about power usage, just set the CPU to the lowest MHz like I did. If you're doing it, please don't forget to look at boinc, because they need all the help they can get with computing power.

emilburzo 7y ago
How do you get such a glare-free image behind a window?
- rocky1138 7y ago
  I hot glued the camera to the glass so there is no air gap.

rhinoceraptor 7y ago

A couple things I find useful: - ZFS fileshare - Plex Server - Time Machine server for Macs - CUPS server, my printer is old and requires drivers, so now I can print from my phone and computers without drivers - Run your own IRC bouncer if you're into that kind of thing - Run a seedbox, just for Linux ISOs of course :)

callmeal 7y ago
>- Plex Server I had to stop using plex after they insisted on knowing everything I was watching. Mine runs pihole, a print-server, and a fileserver for kodi now.

godshatter 7y ago

Run a freenet node, or setup a YaCy node, or some other network node. An always-on network node for projects like those can really benefit them.

true_tuna 7y ago

I set up a gitlab ci/cd server. It was fun, just the right about of challenging. Although gitlab has free hosted accounts so maybe not too useful.

cr0sh 7y ago

For a while I ran a box as a combo LAMP and ZoneMinder server; I ended up shutting it down as I wasn't using the LAMP server much any longer, and ZoneMinder was overkill for my purposes... ...but if you've never played around with a security camera system like ZoneMinder allows for, it can be an interesting experience. Like I said, complete overkill for my home security camera system - but it would be perfect if you set it up like an appliance, on a beefy system - because it needs a lot of CPU to process frames and such - and you have a lot of cameras to work with. You can hook up virtually any kind of camera; from a simple USB webcam (heck, you could probably even get a parallel port black and white quickcam to work if you were crazy enough), to a set of cameras on a multi-input video digitizer card, to a full-on professional level PTZ (pan-tilt-zoom) camera (with PTZ control!). It is fairly complex to set up properly; one could easily create a business around it selling turnkey camera security appliances if one wanted to, I believe - though I don't think I've seen any such business like that (unlike how there are/were tons of companies doing VOIP using custom Asterisk systems). The whole application is written (IIRC) in Python; I don't recall what it uses for the video processing (whether OpenCV or some other library). It uses multiple processes to handle everything (it isn't a monolithic system), so it is fairly robust. But as I mentioned, the more cameras/video streams you have (and the higher resolution those cameras are), the more CPU you need to process everything. I'm not sure if there is a hard limit, or a way to segregate things across multiple systems (ie - some kind of clustering?); I think you can specify a separate DB server... Anyhow - it's something different; I had it at one time running on a PII-350 with 64 Mb of RAM years ago - the last machine, IIRC, was a P4-933 with 256 Mb of RAM - and I could process a couple of streams of 640x480 color video from a couple of IP cameras (all I needed for my home system). But that was the limit for that machine. A more modern machine would probably work much better.

hestefisk 7y ago

Install Asterisk and run your own home PBX using SIP.

PopeDotNinja 7y ago

If you're interested in learning about Systemd, you could service that runs in the background. Here's an an example of a Slack it I wrote... A couple years ago & at the last minute, I needed to cover for a sys admin on a new, complicated system that didn't yet have much automation or monitoring. I only got 2 hours of instruction before he needed to disappear for two weeks. We had a status page that showed the status of services, but it wasn't wired to email alerts, PagerDuty, etc. I really didn't want to keep staring at the status page. So I wrote a simple bash script that curled the status page once per minute. Then the script grep-ed thru the html looking for a line that indicated there was a critical failure. Finally, I did a curl post request to a slack channel that said "the servers are on fire" if there was something to report, and occasionally posted a "the servers are not on fire" if everything was fine. It was a great hack that made life easier while I learned how to properly manage the system, and help with wiring up the monitoring. It was pretty quick to write, too!

cr0sh 7y ago

It's been mentioned in passing form a few times, but if the machine is decent enough (cpu and ram), you might consider setting it up to run and learn Docker or some other virtualization/container system.

malceore1 7y ago

I would sugguest: 1. CUPS print server 2. Pihole 3. Automated Backup storage 4. Network Storage with Samba At home I use Mozilla Webthings gateway but running on Lubuntu Server instead of the sugguested Raspberry Pi. I even host a local only voice assistant that leverages Gateway to control device states. https://hacks.mozilla.org/2019/04/introducing-mozilla-webthings/ https://hacks.mozilla.org/2019/04/introducing-mozilla-webthi...

moduspwnens14 7y ago

If you haven't learned Kubernetes yet, it's probably a good use case for that. Then use any of the other ideas here, except deploy them through Kubernetes.

jolmg 7y ago

Just to see what happens, it might be cool to find a way to safely (as in without compromising your local network) provide root read, write and execute access to the whole anonymous, public internet while still being able to fully inspect everything that people (and bots) do. Maybe you can set an "intranet" of virtual machines to also see how people/bots move around the network. Kind of like: https://www.xkcd.com/350/ https://www.xkcd.com/350/

somepig 7y ago
expect a bricked firmware and/or child porn repository within 72 hours
- jolmg 7y ago
  Ha. Would people really do that? I honestly don't know what to expect. Maybe bitcoin mining? Anyway, if we're talking about fun, I can't think of anything more exciting than seeing what happens in this scenario. I imagine the way you expose it makes a difference, too, in what kind of people you attract.
  - snazz 7y ago
    I don’t think you need to expose it—a root account with “password” as the password and open SSH on port 22 would do the trick.
    - dddddaviddddd 7y ago
      With adequate traffic filtering/limitations and VM snapshots, could be interesting.
      - theossuary 7y ago
        Buy a second internet connection from your ISP if you're going to do that.

asoltys83 7y ago

run a sia node: https://sia.tech/ https://sia.tech/

lawrencegs 7y ago

If you have tons of space, how about running a blockchain node? Something like FileCoin node is interesting because you can theoretically made some tokens when you’re doing it.

gigama 7y ago

Running a Folding@Home client is a helpful way to contribute spare CPU cycles to science... https://foldingathome.org/ https://foldingathome.org/

smivan 7y ago

I wrote an article about this exact question: https://blog.ivansmirnov.name/what-can-you-do-with-a-personal-server/ https://blog.ivansmirnov.name/what-can-you-do-with-a-persona... Some new tech that hasn't made it on the list yet: - https://github.com/issmirnov/zap https://github.com/issmirnov/zap - recursive URL expander, can be run at DNS level. Ie, "n/" -> "https://news.ycombinator.com/" https://news.ycombinator.com/" or "f/g/homelab" -> facebook.com/groups/homelab - netdata - https://concourse-ci.org/ https://concourse-ci.org/ - https://varnish-cache.org/intro/ https://varnish-cache.org/intro/ - AFP/NFS/samba for file sharing - https://github.com/janeczku/calibre-web https://github.com/janeczku/calibre-web - web UI for calibre ebooks - https://jupyter.org/ https://jupyter.org/ for python scripts and web scraping - https://github.com/cdr/code-server https://github.com/cdr/code-server for an IDE in a tab. - https://www.portainer.io/ https://www.portainer.io/ if you use docker - https://yourls.org/ https://yourls.org/ for a private URL shortener in your home

gsliepen 7y ago

Run a mirror for your favorite projects. This can be for individual programs, or for whole repositories of data like the Debian archive or Wikipedia. Please do check with whatever project you are mirroring if they are OK with it (in case bandwidth will be significant) and what the best practices are that they recommend.

wdroz 7y ago

DNS tunnel "server" using iodine https://github.com/yarrick/iodine https://github.com/yarrick/iodine "Free" Wifi in the whole world after that as most AP allow DNS requests.

sandinmyjoints 7y ago
I tried to do this about a year ago on an Ubuntu DO Droplet with a static public IP to point the NS record to and I never could get it to work. Even tried this fork which has a few more commits than upstream: https://github.com/advoryanskiy/iodine https://github.com/advoryanskiy/iodine So are you running this successfully? Mind sharing your stack and hosting environment?
- wdroz 7y ago
  With fresh Ubuntu 18.04, I just installed some packages to be able to run `make` without issues. I did exactly the same as stated in the README t1 IN NS t1ns.mydomain.com. ; note the dot! t1ns IN A 10.15.213.99 I configured these entries from the domain provider directly. Then I use proxychains with a sock tunnel (ssh -D ...) to run whatever I want through the tunnel.

jedberg 7y ago

rm -rf /bin Then try to recover from it.

ChuckMcM 7y ago

I used an old VAX for a while connected to full frontal internet with a Telnet port available. One of the cool things VMS had was a way to mirror the session from one terminal on another. It would watch while script kiddies would try to break in, only to be confused about what it was they had broken into when they succeeded. I'm sure you could do something like this by running VMS on simh and a vlan/pty and use your modem's port routing nat feature to send it telnet traffic. My go to "spare Linux server" environment has been RasPis for a while though since headless they are pretty cheap, with an actual x86 there are perhaps some interesting PCIe, PCI ,or ISA cards (depends on how old it is) that are fun. Setting it up as a media transfer station to move things off 5.25" floppy or 3.5" floppy or Zip disks or something can be a fun use as well.

grahamburger 7y ago

Matrix and Mastodon are kinda fun, and federated so you can join a community even if it's just you on your server.

peterbmarks 7y ago

Ever since Google Reader was killed I've run a https://tt-rss.org https://tt-rss.org server.

crobertsbmw 7y ago

Fork bomb. Seriously, it’s a fun learning excersize.

scottydelta 7y ago
Many years ago I was in a course which had a lab. We would log onto linux machines with network based login(kerberos IIRC). Once logged in, you could also ssh into a server available to us for running codes(limited access). One day while the lab was in session, I was just playing with stuff and tried executing a fork bomb on the server. The moment I executed the fork bomb, all the 120 machines in the lab became unresponsive, including mine. I didnt realize at that time that they were using the same server for code execution as well as auth server. No one knew what happened and the class was dismissed.

tenebrisalietum 7y ago

- FreshRSS; get all your RSS feeds remotely in one spot. - OnlyOffice; this is basically an open-source version of Google Docs. It's rather heavyweight - you will need 2 hosts for this to run and the install uses many varied components, so this is a great opportunity to work with virtualization or containerization. - EtherCalc; a shared spreadsheet, much easier to setup than OnlyOffice. - WARCproxy; record your web browsing to a WARC archive and play it back later. - Install nginx, setup a 64GB VM, install a graphical Linux desktop on it, and use NoVNC and nginx websockets to allow external access to it. - Play with Yacy, a search engine. - Seed some Debian torrents and help out the community.

jamieweb 7y ago

Rosetta@Home - perform medical research using your spare CPU cycles.

T3RMINATED 7y ago

microsoft windows trumps linux so stop going to linux just use windows 10

decentralizer 7y ago

Hosting a Tor relay. Also if you contribute to network with at least 500 KBytes/s internet speed, you get a Tor T-shirt after 60 days.

quickthrower2 7y ago

A Kubernetes Node. An elastic search for whatever you fancy searching