LXC Nesting Snippet from stgraber.org

Credits: LXC in Ubuntu 12.04 LTS (Posted on 2012/05/04 by Stéphane Graber at stgraber.org)
------------------------------------------------------------------------------------------

    sudo apt-get install lxc
    sudo lxc-create -t ubuntu -n my-host-container -t ubuntu
    sudo wget https://www.stgraber.org/download/lxc-with-nesting -O /etc/apparmor.d/lxc/lxc-with-nesting
    sudo /etc/init.d/apparmor reload
    sudo sed -i "s/#lxc.aa_profile = unconfined/lxc.aa_profile = lxc-container-with-nesting/" /var/lib/lxc/my-host-container/config
    sudo lxc-start -n my-host-container
    (in my-host-container) sudo apt-get install lxc
    (in my-host-container) sudo stop lxc
    (in my-host-container) sudo sed -i "s/10.0.3/10.0.4/g" /etc/default/lxc
    (in my-host-container) sudo start lxc
    (in my-host-container) sudo lxc-create -n my-sub-container -t ubuntu
    (in my-host-container) sudo lxc-start -n my-sub-container

---------------------------------------------------
https://www.stgraber.org/download/lxc-with-nesting:
---------------------------------------------------

# Do not load this file.  Rather, load /etc/apparmor.d/lxc-containers, which
# will source all profiles under /etc/apparmor.d/lxc

profile lxc-container-with-nesting flags=(attach_disconnected,mediate_deleted) {
  network,
  capability,
  file,
  umount,

  # addition for container nesting
  mount -> /sys/fs/cgroup/**,
  mount fstype=proc -> /var/cache/lxc/**,
  mount fstype=sysfs -> /var/cache/lxc/**,
  mount fstype=devpts -> /dev/pts/,
  mount -> /usr/lib/lxc/root/,
  mount -> /usr/lib/lxc/root/**,
  mount /dev/pts/ptmx/ -> /dev/ptmx/,
  pivot_root,
  change_profile -> lxc-*,

  # ignore DENIED message on / remount
  deny mount options=(ro, remount) -> /,

  # allow tmpfs mounts everywhere
  mount fstype=tmpfs,

  # allow mqueue mounts everywhere
  mount fstype=mqueue,

  # allow bind mount of /lib/init/fstab for lxcguest
  mount options=(rw, bind) /lib/init/fstab.lxc/ -> /lib/init/fstab/,

  # deny writes in /proc/sys/fs but allow fusectl to be mounted
  mount fstype=binfmt_misc -> /proc/sys/fs/binfmt_misc/,
  deny @{PROC}/sys/fs/** wklx,

  # block some other dangerous paths
  deny @{PROC}/sysrq-trigger rwklx,
  deny @{PROC}/mem rwklx,
  deny @{PROC}/kmem rwklx,
  deny @{PROC}/sys/kernel/** wklx,

  # deny writes in /sys except for /sys/fs/cgroup, also allow
  # fusectl, securityfs and debugfs to be mounted there (read-only)
  mount fstype=fusectl -> /sys/fs/fuse/connections/,
  mount fstype=securityfs -> /sys/kernel/security/,
  mount fstype=debugfs -> /sys/kernel/debug/,
  deny mount fstype=debugfs -> /var/lib/ureadahead/debugfs/,
  mount fstype=proc -> /proc/,
  mount fstype=sysfs -> /sys/,
  deny /sys/[^f]*/** wklx,
  deny /sys/f[^s]*/** wklx,
  deny /sys/fs/[^c]*/** wklx,
  deny /sys/fs/c[^g]*/** wklx,
  deny /sys/fs/cg[^r]*/** wklx,
}