Quoting Trent W. Buck (t...@cybersource.com.au):
Serge E. Hallyn serge.hal...@canonical.com
writes:
Quoting Trent W. Buck (trentb...@gmail.com):
A race condition in my containers means that occasionally
/var/run/screen/ isn't present when startup finishes and I SSH in.
This results in an error when normal users try to run screen.
I believe the race is against my lxc integration job:
root@imago:~# cat /etc/init/lxc.conf
start on startup
task
script
[...]
find /var/run/ -xdev -not -path /var/run/ -delete
The screen-cleanup job is
root@imago:~# grep -v ^$ /etc/init/screen-cleanup.conf
start on filesystem
task
script
SCREENDIR=/var/run/screen
if [ -L $SCREENDIR ] || [ ! -d $SCREENDIR ]; then
rm -f $SCREENDIR
mkdir $SCREENDIR
chown root:utmp $SCREENDIR
fi
[...]
Obviously the *right* solution is to use a tmpfs for /var/run, as
non-containerized Ubuntu does. Since this breaks lxc-start's
reboot/halt (via utmp) detection, I'm looking for the next best
workaround.
I think this is probably to disable /etc/init/mountall.conf and spoof
If you're saying that what you need is for this to run before mountall.conf,
then you can make sure that screen-cleanup.conf finishes before mountall
starts by making it
start on starting mountall
Then it will finish before mountall really starts.
screen-cleanup creates /var/run/screen -- it needs to run *after*
lxc.conf deletes everything in /var/tmp. It (lxc) does that to simulate
mounting a tmpfs on /var/run, which is something the mountall job
normally does, and what it normally emits a filesystem event after.
But with the lxc job above, /var/run is deleted asynchronously from the
mountall run, meaning that screen-cleanup can earlier. Changing
screen-cleanup to depend on anything mountall emits wouldn't help,
AFAICT -- and more to the point, it'd only fix screen-cleanup and not
arbitrary other jobs that might be created when a new package is
installed.
I'm not groking what order you want/need upstart jobs to run in,
I just wanted to make sure that you knew you had quite a bit of
power in specifying the order.
From the above it sounds like you actually might want to have
lxc.conf start on starting mountall, and have IT mkdir -p /var/run/screen.
-serge
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