Date: Mon, 16 May 2016 10:58:19 -0400 From: Allan Jude <allanjude@freebsd.org> To: freebsd-jail@freebsd.org Subject: Re: Unresponsive jails issues Message-ID: <5739E00B.7090100@freebsd.org> In-Reply-To: <6beab349-73bb-7159-cd81-443e115b687a@gjunka.com> References: <6beab349-73bb-7159-cd81-443e115b687a@gjunka.com>
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On 2016-05-16 08:55, Grzegorz Junka wrote: > I have a server running 13 jails for various system services. Recently I > added two jails to run simple go applications for testing. They open a > network socket and nginx, which is in another jail, and which round > robin balances requests to them. I mention that because it may be > related, however not necessarily because it was happening earlier. > > The problem is that every 2-3 days jails in my servers stop responding. > "jexec jailname tcsh" hangs forever, "service jail stop jailname" hangs > forever as well. "top" doesn't show anything suspicious. I can login > through SSH to the main server fine. I don't login to jails through SSH > so I can't check but it seems that when that happens they stop > responding because the services that are running in them stop too (e.g. > web server, imap, ...). I tried to "kill -9" the "jexec" process that > hangs but that doesn't work. > > My first question is what evidence should I gather when that happens so > that I can investigate the issue later on after the server is restarted? > > And the second question, any idea why that might be happening in the > first place? > > I am running FreeBSD 10.3 AMD64 updated from 10.2 a couple of weeks ago. > > Grzegorz > > _______________________________________________ > freebsd-jail@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-jail > To unsubscribe, send any mail to "freebsd-jail-unsubscribe@freebsd.org" When you issue the jexec and it hangs, try pressing 'control+t' to see what the waitchan is. Along with what Bjoern said, using procstat -k <pid> to examine other processes etc. -- Allan Jude
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