Hi, it bugged me that there is no "clean" way to shut down a full system container from the outside, so I wrote the attached helper script.
It finds the "init" process for the container and sends the INT signal to that process, which most init systems (all?) interpret as a request to reboot the system. Changing the inittab (or whatever is cool with current init systems) to make the system halt instead gives us a nice way to shut down a container in a clean fashion. Since this script may be usable for system shutdown scripts, I also implemented a timeout, but maybe lxc-wait should be extended to provide that functionality... Thoughts, comments? Greetings, Tobi -- My blog: http://blog.23.gs/ GPG-Key 0xE2BEA341 - signed/encrypted mail preferred http://www.fli4l.de/ - ISDN- & DSL-Router on one disk! Registered FLI4L-User #00000003
#!/bin/sh
# set -ex
usage() {
echo "Usage: $(basename $0) {--name|-n} <name> [{--wait|-w} <timeout>]"
}
help() {
usage
echo
echo "send the INT signal to a specified container"
echo "to simulate Ctrl+Alt+Del for a clean shutdown"
echo
echo "Options:"
echo "name : name of the container"
echo "help : this current help."
echo "wait : wait <timeout> seconds for the container to stop."
echo
echo "For proper operation the ctrlaltdel action of the"
echo "container should halt the system."
}
name=
waittime=
for i in "$@"; do
case $i in
-h|--help)
help; exit 1;;
-n|--name)
name="$2"; shift 2;;
-w|--wait)
waittime="$2"; shift 2;;
esac
done
if [ -z "$name" ]; then
usage
exit 1
fi
cgroups=$(mount -l -t cgroup)
cgroup_path=""
for i in "$cgroups"; do
set -- $i
cgroup_name=$1
cgroup_path=$3
if [ "$cgroup_name" = "lxc" ]; then
break;
fi
done
if [ -z "$cgroup_path" ]; then
echo "no cgroup mount point found"
exit 1
fi
init_pid=
while read pid
do
set -- $(cat /proc/$pid/stat)
ppid=$4
if ! grep -q $ppid "$cgroup_path/$name/tasks"
then
init_pid=$pid
break
fi
done < "$cgroup_path/$name/tasks"
if [ -z "$init_pid" ]; then
echo "no process found for '$name'"
exit 1
fi
kill -s INT $init_pid
if [ "$waittime" ]; then
while [ "$waittime" -gt 0 ]; do
if lxc-info -n "$name" | grep -q 'is STOPPED'
then
exit 0
fi
sleep 1
waittime=$((waittime - 1))
done
exit 1
fi
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