Date: Thu, 19 Mar 2020 21:01:32 +0700 From: Victor Sudakov <vas@sibptus.ru> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: Miroslav Lachman <000.fbsd@quip.cz>, freebsd-net@freebsd.org, freebsd-questions@freebsd.org Subject: Re: IPv6 in jails Message-ID: <20200319140132.GA93947@admin.sibptus.ru> In-Reply-To: <01EF7656-4F8A-4075-A0B4-27E8AB17B516@lists.zabbadoz.net> 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> <01EF7656-4F8A-4075-A0B4-27E8AB17B516@lists.zabbadoz.net>
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--tKW2IUtsqtDRztdT Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Bjoern A. Zeeb wrote: >=20 > > > If it does, can you add a > > >=20 > > > exec.start +=3D "sleep 2 "; > > >=20 > > > to your config > >=20 > > OK, I've added it to the configs of 3 experimental jails. > >=20 > > > and see if your problem goes away? > >=20 > > 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: > >=20 > .. > >=20 > > > 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 What is "DUD" BTW? > > > seconds > > > avoids this problem and the address is usable at that time. > >=20 > > There is obviously a race somewhere, but the 2 second sleep does not > > eliminate it entirely. >=20 > Well not so much of a race but than a =E2=80=9Cgap=E2=80=9D. >=20 > The point is you are configuring an address on the base system and the ja= il > knows nothing about it so it=E2=80=99ll simply start the daemons. Normal= ly the > startup scripts would do the right thing. >=20 > I don=E2=80=99t think =E2=80=9Cpolluting=E2=80=9D jail(8) with logic to c= heck that the addresses > become available or not is a good idea. However I agree that it should > automatically do the right thing somehow .. >=20 >=20 >=20 > > Thank you for the hint in the right direction, what would you suggest > > further? >=20 > If you make it 3 seconds, does it deterministically work then? Not quite: https://termbin.com/arvb syslogd sometimes remains deprived of the IPv6 address. --=20 Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/ --tKW2IUtsqtDRztdT Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEcBAEBAgAGBQJec3s8AAoJEA2k8lmbXsY0Od0IAK0+xmWkuH/uazuRTSVKr9VI +XHfx9+tThzPE0MlrPBwJJ0x0Mj+HbI9RxYxQlmCRXkNoNQ2oIca5KmEjSHlnr+p cka9T025H2mJ//SP53i8ZFB8+kVlj4z6nsE+X0eJBuah0dhmdrAP/p7oWWgpPRYq mqwagg814XAWNXzWfZZ8LDtlgjVszY2L29khNojAk9Ao87slowlJ8j+BPCKrF30Y WPiHUTlW8hVmogsKB6q+bdNg6ePqAoG9GbyM4UF6tHrEQH9M0RwpS1lDSkTNZdTj amgRXlQFcS8IuPUIlFntTuJdtFvFGN0z2ZncFEHjsHKbcCQce6BnQs1TjEBnm0M= =+OwQ -----END PGP SIGNATURE----- --tKW2IUtsqtDRztdT--
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