Date: Mon, 16 May 2016 12:55:02 +0000 From: Grzegorz Junka <list1@gjunka.com> To: freebsd-jail@freebsd.org Subject: Unresponsive jails issues Message-ID: <6beab349-73bb-7159-cd81-443e115b687a@gjunka.com>
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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
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