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#!/bin/bash
# set -ex
usage() {
echo "usage: $(basename $0) --name <name> [netstat options]"
}
help() {
usage
echo
echo "execute netstat for the specified container"
echo "with the added netstat options"
echo
echo "Options:"
echo "name : name of the container"
echo "help : this current help."
echo
echo "to be executed as root."
}
exec=""
if [ $# -eq 0 ]; then
usage
exit 1
fi
for i in "$@"; do
case $i in
-h|--help)
help; exit 1;;
-n|--name)
name=$2; shift 2;;
--exec)
exec="exec"; shift;;
esac
done
if [ -z "$exec" ]; then
exec @BINDIR@/lxc-unshare -s MOUNT -- $0 -n $name --exec "$@"
fi
if [ -z "$name" ]; then
usage
exit 1
fi
lxc-info -n $name 2>&1 | grep -q 'STOPPED'
if [ $? -eq 0 ]; then
echo "Container $name is not running"
exit 1
fi
cgroups=$(mount -l -t cgroup)
cgroup_path=""
for i in "$cgroups"; do
cgroup_name=$(echo $i | awk ' { print $1 } ')
cgroup_path=$(echo $i | awk ' { print $3 } ')
if [ "$cgroup_name" == "lxc" ]; then
break;
fi
done
if [ -z "$cgroup_path" ]; then
cgroups=`grep -m1 -E '^[^ \t]+[ \t]+[^ \t]+[ \t]+cgroup' /proc/self/mounts`
for i in "$cgroups"; do
cgroup_path=$(echo $i | awk ' { print $2 } ')
if [ -n $cgroup_path ]; then
break;
fi
done
fi
if [ -z "$cgroup_path" ]; then
echo "no cgroup mount point found"
exit 1
fi
# the container will be in:
# ${cgroup_path}.${init_cgroup_path}."lxc".$name
init_cgroup=`cat /proc/1/cgroup | awk -F: '{ print $3 }' | head -1`
final_cgroup_path=$cgroup_path/$init_cgroup/lxc
pid=$(head -1 $final_cgroup_path/$name/tasks)
if [ -z "$pid" ]; then
echo "no process found for '$name'"
exit 1
fi
mount -n --bind /proc/$pid/net /proc/$$/net && \
exec netstat "$@"
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