LinuxContainer00

17 July 2011

Make and install lxc rpm packages

The spec file for lxc is included in lxc source code.So you can make rpm packages of lxc easily.

# yum -y update kernel
# reboot
# yum -y install rpm-build libcap-devel docbook-utils kernel-devel gcc make
# wget http://lxc.sourceforge.net/download/lxc/lxc-0.7.4.2.tar.gz
# tar zxvf lxc-0.7.4.2.tar.gz
# mkdir -p ~/rpmbuild/SOURCES
# cp lxc-0.7.4.2.tar.gz ~/rpmbuild/SOURCES
# chown root:root lxc-0.7.4.2/lxc.spec
# rpmbuild -ba lxc-0.7.4.2/lxc.spec --define 'ksrc /usr/src/kernels/`uname -r`'
# rpm -Uvh ~/rpmbuild/RPMS/x86_64/lxc-0.7.4.2-1.x86_64.rpm

Check whether this os is lxc ready or not

All statuses should be "enabled".

# lxc-checkconfig 
Kernel config /proc/config.gz not found, looking in other places...
Found kernel config file /boot/config-2.6.32-131.2.1.el6.x86_64
--- Namespaces ---
Namespaces: enabled
Utsname namespace: enabled
Ipc namespace: enabled
Pid namespace: enabled
User namespace: enabled
Network namespace: enabled
Multiple /dev/pts instances: enabled

--- Control groups ---
Cgroup: enabled
Cgroup namespace: enabled
Cgroup device: enabled
Cgroup sched: enabled
Cgroup cpu account: enabled
Cgroup memory controller: enabled
Cgroup cpuset: enabled

--- Misc ---
Veth pair device: enabled
Macvlan: enabled
Vlan: enabled
File capabilities: enabled
enabled

Quick Start

In the man of lxc, you can get how to start lxc quickly.

QUICK START
       You are in a hurry, and you don’t want to read this man page. Ok, with-
       out warranty, here are the commands to launch a  shell  inside  a  con-
       tainer   with   a  predefined  configuration  template,  it  may  work.
       /usr/bin/lxc-execute -n foo -f /usr/share/doc/lxc/examples/
       lxc-macvlan.conf /bin/bash

But before running lxc-execute, you should mount croup.

# mount -t cgroup cgroup /cgroup
# /usr/bin/lxc-execute -n foo -f /usr/share/doc/lxc/examples/lxc-macvlan.conf /bin/bash

In the container, processes are like this.

# ps -ef
UID        PID  PPID  C STIME TTY          TIME CMD
root         1     0  0 10:54 ttyS0    00:00:00 /usr/lib64/lxc/lxc-init -- /bin/
root         2     1  0 10:54 ttyS0    00:00:00 /bin/bash
root        11     2  0 10:55 ttyS0    00:00:00 ps -ef

You can also see the processes in the container from the outside of the container.

# lxc-ps --name=foo
CONTAINER    PID TTY          TIME CMD
foo         1654 ttyS0    00:00:00 lxc-init
foo         1656 ttyS0    00:00:00 bash

The sample lxc conf is like this.

# cat /usr/share/doc/lxc/examples/lxc-macvlan.conf 
# Container with network virtualized using the macvlan device driver
lxc.utsname = alpha
lxc.network.type = macvlan
lxc.network.flags = up
lxc.network.link = eth0
lxc.network.hwaddr = 4a:49:43:49:79:bd
lxc.network.ipv4 = 1.2.3.4/24
lxc.network.ipv6 = 2003:db8:1:0:214:1234:fe0b:3596