Linux Containers

Date: Wed, Jan 28, 2015

Setting up and using Linux Containers (LXC) on Debian

Linux Containers provide a Free Software virtualization system for computers running GNU/Linux. This is accomplished through kernel level isolation. It allows one to run multiple virtual units simultaneously. Those units, similar to chroots, are sufficiently isolated to guarantee the required security, but utilize available resources efficiently, as they run on the same kernel.

apt-get install lxc bridge-utils debootstrap

First we will setup our Bridge: Linux:bridge-utils


cgroup          /sys/fs/cgroup         cgroup  defaults        0       0

mount -a

nano vm0.cfg

Following is a template config file. If you are also looking at other howto’s, don’t get coughed up at the fstab mount option. The debian script takes care of that. You will at leased have to change the IP address.


lxc.utsname = vm0
lxc.rootfs = /var/lib/lxc/vm0/rootfs

lxc.tty = 4 = veth = up = br0 = eth0 = 1500

# security parameter
lxc.cgroup.devices.deny = a # Deny all access to devices
lxc.cgroup.devices.allow = c 1:3 rwm   # dev/null
lxc.cgroup.devices.allow = c 1:5 rwm   # dev/zero
lxc.cgroup.devices.allow = c 5:1 rwm   # dev/console
lxc.cgroup.devices.allow = c 5:0 rwm   # dev/tty
lxc.cgroup.devices.allow = c 4:0 rwm   # dev/tty0
lxc.cgroup.devices.allow = c 4:1 rwm   # dev/tty1
lxc.cgroup.devices.allow = c 4:2 rwm   # dev/tty2
lxc.cgroup.devices.allow = c 1:9 rwm   # dev/urandon
lxc.cgroup.devices.allow = c 1:8 rwm   # dev/random
lxc.cgroup.devices.allow = c 136:* rwm # dev/pts/*
lxc.cgroup.devices.allow = c 5:2 rwm   # dev/pts/ptmx
lxc.cgroup.devices.allow = c 254:0 rwm # dev/rtc

# mounts point
lxc.mount.entry=proc   /var/lib/lxc/vm0/rootfs/proc proc nodev,noexec,nosuid 0 0
lxc.mount.entry=devpts /var/lib/lxc/vm0/rootfs/dev/pts devpts defaults 0 0
lxc.mount.entry=sysfs  /var/lib/lxc/vm0/rootfs/sys sysfs defaults  0 0


lxc-create -f $LXCDIR/vm0.cfg -n vm0
cp /usr/lib/lxc/templates/lxc-debian $LXCDIR

At this point you might wont to make lxc-debian your own. At leased change the release from Lenny to Squeeze

./lxc-debian -p vm0

The vm0 should have been created now. Your root password is root. Before we start it up we will make some config changes.

First edit your network config

nano $LXCDIR/vm0/rootfs/etc/network/interfaces

File needs to look like this: // Note change the IP addresses to yours, if you don’t know how, you know you shouldn’t be here //

# The loopback network interface
auto lo
iface lo inet loopback
up route add -net netmask dev lo
down route add -net netmask dev lo

auto eth0
iface eth0 inet static

Now we will try to boot the system.

lxc-start -n vm0

default password:

  • user: root
  • password: root

Tip: copy your ~/.ssh folder to each server for passwordless login

nano /etc/default/locale

And add:


Configure locales

dpkg-reconfigure locales

Open /etc/inittab and make sure you comment out like this:

1:2345:respawn:/sbin/getty 38400 console
#c1:12345:respawn:/sbin/getty 38400 tty1 linux
#c2:12345:respawn:/sbin/getty 38400 tty2 linux
#c3:12345:respawn:/sbin/getty 38400 tty3 linux
#c4:12345:respawn:/sbin/getty 38400 tty4 linux

Now you should be at the vm0 login, try user root with pass root
Try to ping a domain you know works, and it should give you a response otherwise your network setup failed.

Assuming it worked, let’s make it permanent.

ln -s $LXCDIR/vm0/config /etc/lxc/vm0.conf

Turn this on and add vm0 to the container variable.

cd /etc/default/
nano lxc

Next we will setup the server:

LXC Debian Server Setup

Useful Resources:

Found another approach which looks interesting