Nicholas Marriott <nicholas.marri...@gmail.com> on Mon, 23 May 2011
20:18:21 +0100:
> I'm not convinced tmux should need PAM support to do something
> perfectly normal.
>
> How does systemd deal with other programs that want to daemonize?
> Surely it doesn't kill eg httpd if you start it from a terminal.
Surely it does! ;)
"Mark T. Kennedy" <mkenn...@diamondbackcap.com> on Tue, 24 May 2011
08:00:51 -0400:
> hmm... that doesn't happen to me on an FC15 instance running
> systemd. i.e.
>
> ssh fc15-box 'tmux attach || tmux new-session'
>
> followed by detaching, followed by a 2nd invocation of the
> same command, puts me back in the original session.
Ok, let's be a bit more specific.
Case A:
You do not have set up anything in /etc/pam.d/ for systemd. Services
started by systemd get their own cgroup
(name=systemd:/system/{httpd,sshd,slim}.service), processes started by
these parents get the same cgroup.
So if you ssh to a box, start tmux, detach, log out and restart sshd
the tmux session is kill as well. The same is true for a tmux session
launched anywhere under X when you restart the login manager.
Case B:
You have set up pam_systemd.so without any options. Interactive
sessions get their own cgroup, systemd does not care left over
processes if the user logs out.
tmux should work without any problems in this case, but there is no
garbage collection.
Case C:
You have set up pam_systemd.so with with kill-user=1, kill-session=1 or
similar options. Processes in the same cgroup are killed as soon as the
user logs out. This kills daemons like gpg-agent, etc. and even httpd
when started from a terminal.
>From man pam_systemd:
> Note that setting kill-user=1 or even kill-session=1 will break
> tools like screen(1).
Pam support for tmux could create it's own cgroup via pam_systemd. This
way tmux could not be broken by systemd.
--
Schoene Gruesse
Chris
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