LXC

Prepare a Linux Container (CT)

Requirements

• A console should be disabled (lxc.console = none)
• udev should not run in CT ($ mv /sbin/udevd{,.bcp})

Prepare a host environment

• Mount cgroupfs

$ mount -t cgroup c /cgroup

• Create a network bridge

# cat /etc/sysconfig/network-scripts/ifcfg-br0 
DEVICE=br0
TYPE=Bridge
BOOTPROTO=dhcp
ONBOOT=yes
DELAY=5
NM_CONTROLLED=n
$ cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE="eth0"
NM_CONTROLLED="no"
ONBOOT="yes"
BRIDGE=br0

Create CT

• Download an OpenVZ template and extract it.

curl http://download.openvz.org/template/precreated/centos-6-x86_64.tar.gz | tar -xz -C test-lxc

• Create a config files

$ cat ~/test-lxc.conf 
lxc.console=none
lxc.utsname = test-lxc
lxc.network.type = veth
lxc.network.flags = up
lxc.network.link = br0
lxc.network.name = eth0
lxc.mount = /root/test-lxc/etc/fstab
lxc.rootfs = /root/test-lxc-root/

$ cat /root/test-lxc/etc/fstab
none /root/test-lxc-root/dev/pts devpts defaults 0 0
none /root/test-lxc-root/proc    proc   defaults 0 0
none /root/test-lxc-root/sys     sysfs  defaults 0 0
none /root/test-lxc-root/dev/shm tmpfs  defaults 0 0

• Register CT

$ lxc-create -n test-lxc -f test-lxc.conf

• Start CT

$ mount --bind test-lxc test-lxc-root/
$ lxc-start -n test-lxc

Dump/Restore a Linux Container

• Install the last crtools' kernel Linux checkpoint/restore tree
• Install a modified version of iproute2
• Write a path to the command "ip" to the envoriment variable CR_IP_TOOL

export CR_IP_TOOL=/root/iproute2/ip/ip

• Install crtools