Execute a command for every lxc instance

lxc-foreach

#!/bin/bash

# replace this with your rootfs
lxc_root=/data/containers
for n in `lxc-ls`; do
  name=n
  r=$lxc_root/$n/rootfs
  root=$r
  c=$lxc_root/$n/config
  config=$c
  eval echo "\$ $1" 1>&2
  eval "$1"
done

# example usage
$ lxc-foreach 'lxc-attach -n $n -- apt-get upgrade'