Date: Wed, 1 May 2019 11:22:07 -0400 From: "Michael W. Lucas" <mwlucas@michaelwlucas.com> To: James Gritton <jamie@freebsd.org> Cc: freebsd-jail@freebsd.org, squiggly foo <foo.squiggly@yandex.com> Subject: Re: Application Jail Shutdown Problem Message-ID: <20190501152207.GA35338@mail.mwl.io> In-Reply-To: <9f04fc825b4a931e51c4d7fd5d7ed7e0@freebsd.org> References: <22066461556647435@iva8-3b901672a9c5.qloud-c.yandex.net> <9f04fc825b4a931e51c4d7fd5d7ed7e0@freebsd.org>
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On Wed, May 01, 2019 at 08:53:18AM -0600, James Gritton wrote: > On 2019-04-30 12:03, squiggly foo wrote: > > Hi All, > > > > I use the mount.fstab parameter to mount a number of file systems > > before starting a jail which works without any problem. However since > > it is an application jail, there are no other processes running inside > > the jail other than the one application. As soon as that application > > terminates the jail is removed by the host. > > > > This is actually my preferred behavior; I want the jail to be removed > > when the process inside of it terminates. But the problem is that the > > mount points are not unmounted after the jail is removed that way. > > The only way I can get the jails to unmount is if I do a "jail -r > > jailname" which is what I want to avoid as I would not do that while > > the process inside the jail is still running. > > > > > > Does anyone know of a way for the jails to umount the mount points in > > its fstab file when the only process inside the jail exits? > > No easy way. Those filesystems have to be unmounted by somebody; the > jail can't do it because it doesn't have the permission (because it > didn't > mount them). So some process needs to be watching to see when the jail > goes away. That would be some kind of watcher that wakes up > occasionally > and sees if the jail is still there. It might be nice to have some > kqueue > support for jails. Maybe I'm not understanding the problem. Is there a reason why exec.poststop="umount -aF /whatever/jail.fstab" won't do the trick? ==ml -- Michael W. Lucas https://mwl.io/ author of: Absolute OpenBSD, SSH Mastery, git commit murder, Immortal Clay, PGP & GPG, Absolute FreeBSD, etc, etc, etc...
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