Date: Thu, 19 Mar 2020 13:22:40 +0000 From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: "Victor Sudakov" <vas@sibptus.ru> Cc: "Miroslav Lachman" <000.fbsd@quip.cz>, freebsd-net@freebsd.org, freebsd-questions@freebsd.org Subject: Re: IPv6 in jails Message-ID: <01EF7656-4F8A-4075-A0B4-27E8AB17B516@lists.zabbadoz.net> In-Reply-To: <20200319021432.GA80800@admin.sibptus.ru> References: <20200318151556.GA64871@admin.sibptus.ru> <2dd539ed-0ee3-079b-27b2-28126056c69a@quip.cz> <20200318155046.GD65497@admin.sibptus.ru> <4CA69535-0F6C-40FC-83CF-5000FD728C2D@lists.zabbadoz.net> <20200319021432.GA80800@admin.sibptus.ru>
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On 19 Mar 2020, at 2:14, Victor Sudakov wrote: >> If it does, can you add a >> >> exec.start += "sleep 2 "; >> >> to your config > > OK, I've added it to the configs of 3 experimental jails. > >> and see if your problem goes away? > > It goes away partially (only for sshd in 2 of the 3 available jails), > and > not for syslogd in any of the 3 available jails. Restarting the > daemons > from within the jail fixes the problem. An example from a problem > jail: > .. > >> If it does, the reason is >> that you configure an IPv6 address to an interface and DUD has not >> yet >> completed by the time sshd or other daemons start. Giving it the 2 >> seconds >> avoids this problem and the address is usable at that time. > > There is obviously a race somewhere, but the 2 second sleep does not > eliminate it entirely. Well not so much of a race but than a “gap”. The point is you are configuring an address on the base system and the jail knows nothing about it so it’ll simply start the daemons. Normally the startup scripts would do the right thing. I don’t think “polluting” jail(8) with logic to check that the addresses become available or not is a good idea. However I agree that it should automatically do the right thing somehow .. > Thank you for the hint in the right direction, what would you suggest > further? If you make it 3 seconds, does it deterministically work then? /bz
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