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On the same topic, what are the other pitfalls of re-using OS images? I can think of: - Hostname conflicts - SSH key duplication - Driver issues if the hard

On the same topic, what are the other pitfalls of re-using OS images? I can think of: - Hostname conflicts - SSH key duplication - Driver issues if the hardware is not the same Are there more? This seems like a compelling argument for bootstrapping new instances with configuration management, rather than trying to re-use OS images.

achillean 12y ago
Speaking of hostname conflicts: an ISP in Vietnam has configured all their devices to have a reverse DNS name of "localhost" https://www.shodan.io/search?query=hostname%3Alocalhost https://www.shodan.io/search?query=hostname%3Alocalhost
- JonRB 12y ago
  I've experienced this too - I seem to get a few people joining my gameserver from that ISP and I notice the DNS appeared as 'localhost'. Not ideal and I imagine it could break certain things. I always assumed it was a misconfigured internet cafe or something. 'Nice' to know it's a wider issue
Xylakant 12y ago
MAC Address duplication on virtual interfaces for VMs started from a template.
- warrenm 12y ago
  Never seen this in years of using VMs
- shitloadofbooks 12y ago
  No (mainstream) Hypervisor does this and you'd run into networking problems pretty quickly if any of those VMs share a network.
  - devicenull 12y ago
    Libvirt has serious issues with this https://www.redhat.com/archives/libvirt-users/2014-November/msg00009.html https://www.redhat.com/archives/libvirt-users/2014-November/...
icebraining 12y ago
An alternative to typical configuration management (puppet, ansible, etc) is making your own OS installer. I've adapted the Ubuntu installer to turn a blank machine into a running instance of our app in just a couple of days. The client just has to pop-in the CD or flash drive, answer a couple of questions, and go grab a cup of tea while it installs.
- warrenm 12y ago
  >in just a couple of days Days?! That is a crazy-long deploy time.
  - icebraining 12y ago
    No, I meant it took me a couple of days to make the installer :-)
    - jamiesonbecker 12y ago
      .. here I thought you were talking about the normal speed of cloudformation to boot up EC2 instances..
      - icebraining 12y ago
        You jest, but our previous "cloud" provider (which we used in 2012/13) took more than that to provision a bog standard Linux VPS - and they often got the distro wrong!
daurnimator 12y ago
Even things like /etc/machine-id
emmelaich 12y ago
MAC addresses. HP-UX saves them in its startup configs for some reason. A place I worked at used a sample build for its 'gold' build. All builds had the same MAC. Hilarity ensued.
elij 12y ago
shared inode number

achillean 12y ago

Speaking of hostname conflicts: an ISP in Vietnam has configured all their devices to have a reverse DNS name of "localhost" https://www.shodan.io/search?query=hostname%3Alocalhost https://www.shodan.io/search?query=hostname%3Alocalhost

JonRB 12y ago
I've experienced this too - I seem to get a few people joining my gameserver from that ISP and I notice the DNS appeared as 'localhost'. Not ideal and I imagine it could break certain things. I always assumed it was a misconfigured internet cafe or something. 'Nice' to know it's a wider issue

Xylakant 12y ago

MAC Address duplication on virtual interfaces for VMs started from a template.

warrenm 12y ago
Never seen this in years of using VMs
shitloadofbooks 12y ago
No (mainstream) Hypervisor does this and you'd run into networking problems pretty quickly if any of those VMs share a network.
- devicenull 12y ago
  Libvirt has serious issues with this https://www.redhat.com/archives/libvirt-users/2014-November/msg00009.html https://www.redhat.com/archives/libvirt-users/2014-November/...

icebraining 12y ago

An alternative to typical configuration management (puppet, ansible, etc) is making your own OS installer. I've adapted the Ubuntu installer to turn a blank machine into a running instance of our app in just a couple of days. The client just has to pop-in the CD or flash drive, answer a couple of questions, and go grab a cup of tea while it installs.

warrenm 12y ago
>in just a couple of days Days?! That is a crazy-long deploy time.
- icebraining 12y ago
  No, I meant it took me a couple of days to make the installer :-)
  - jamiesonbecker 12y ago
    .. here I thought you were talking about the normal speed of cloudformation to boot up EC2 instances..
    - icebraining 12y ago
      You jest, but our previous "cloud" provider (which we used in 2012/13) took more than that to provision a bog standard Linux VPS - and they often got the distro wrong!

daurnimator 12y ago

Even things like /etc/machine-id

emmelaich 12y ago

MAC addresses. HP-UX saves them in its startup configs for some reason. A place I worked at used a sample build for its 'gold' build. All builds had the same MAC. Hilarity ensued.

elij 12y ago

shared inode number