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Ask HN: What Linux diagnostic tools/commands do you use?
I've been writing a basic script (https://github.com/adampie/granscan) and was looking for feedback, what diagnostic tools/commands do you guys use? How should I change the script?
- JosephRedfern 9y agoI guess it depends what I'm trying to debug, but one thing that seems to be missing from your wrapper is quick logfile inspection. Tailing the last n lines of syslog (or something more specific) is often a good starting point when diagnosing problems. Perhaps something that performs basic connectivity tests might be useful, too -- pinging the router, an external IP (like 8.8.8.8), and a FQDN (like google.com) would be a good quick test of both internal connectivity, external connectivity, and DNS resolver.
- adampie 9y agoGood idea, I will add that in once I figure out a better way to deal with the output; I feel like it needs to be cleaner. Might make it menu driven.
- bennofs 9y agostrace - to see what a program is doing / where exactly something is failing if the error message is bad ltrace - same as above, if strace is not enough perf trace - if you don't know the exact process to strace upfront https://github.com/brendangregg/perf-tools https://github.com/brendangregg/perf-tools - to track disk accesses or exec calls env LD_DEBUG=all - debugging dynamic linker issues
- lobster_johnson 9y agoPer-process I/O and network metrics are super important. I usually use pidstat (-d flag gives you I/O) for this, or read data from /proc directly.
- deleted 9y ago[deleted]
- b0n40 9y agonc, tcpdump, ethtool, htop
- gricardo99 9y agolsof netstat strace top
- amingilani 9y agotop, ps aux, which, find, ls, rm, cd, cat, echo, touch, pbcopy, ssh That's pretty much it, otherwise I have a whole lot of cli tools too. Things like git, tmux, mosh, rails.. but I guess they don't count.
- irundebian 9y agoHave a look on this picture which maps subsystems to tools: http://www.brendangregg.com/linuxperf.html http://www.brendangregg.com/linuxperf.html
- deckarep 9y agohtop, iftop, ngrep, tcpdump, lsof, strace, wireshark, nc, telnet, ping, netstat, ps, grep, awk, pv, middleman, curl, jq, mitmproxy, tail, tr.... Okay, ok pretty much all of them. :)
- assafmo 9y agomostly htop, iotop, pv -d... EDIT: ... curl, jq, cat, less, grep, awk, lynx, watch, parallel, xargs, head, tail, sqlite3, rsync, scp...