lxc#
Table of Contents
Linux containers is a kernel based lightweight virtual system mechanism sometimes described as “chroot on steroids”.
It is part of the mainstream kernel, and is based on kernel cgroups.
Resources#
Install and setup#
First install the package lxc. This will introduce some new directories and files :
- /etc/lxc/lxc.conf - the main configuration file for lxc
- /etc/init/lxc.conf - two upstart scripts
- /usr/lib/lxc/templates - contains the `templates' which can be used to create new containers.
- /var/lib/lxc - is where containers and their configuration information are stored.
- /var/cache/lxc - is where caches of distribution data are stored to speed up multiple container creations.
Creating your first container#
Well, this is very simple :
lxc-create -t ubuntu -n ubuntu1
A new directory is created and has contents for a minimal ubuntu system:
athena ~ # ls -l /var/lib/lxc/ubuntu1/ total 12 -rw-r--r-- 1 root root 1304 Feb 3 17:35 config -rw-r--r-- 1 root root 110 Feb 3 15:17 fstab drwxr-xr-x 21 root root 4096 Feb 4 20:55 rootfs -rw------- 1 root root 0 Feb 3 15:17 rootfs.hold athena ~ # ls -l /var/lib/lxc/ubuntu1/rootfs total 76 drwxr-xr-x 2 root root 4096 Feb 3 15:17 bin drwxr-xr-x 2 root root 4096 Apr 19 2012 boot drwxr-xr-x 8 root root 4096 Feb 4 20:55 dev drwxr-xr-x 62 root root 4096 Feb 4 20:55 etc drwxr-xr-x 3 root root 4096 Feb 3 15:17 home drwxr-xr-x 12 root root 4096 Feb 3 15:16 lib drwxr-xr-x 2 root root 4096 Feb 3 15:14 media drwxr-xr-x 2 root root 4096 Apr 19 2012 mnt drwxr-xr-x 2 root root 4096 Feb 3 15:14 opt drwxr-xr-x 2 root root 4096 Apr 19 2012 proc drwx------ 2 root root 4096 Feb 3 18:43 root drwxr-xr-x 6 root root 4096 Feb 3 15:17 run drwxr-xr-x 2 root root 4096 Feb 3 15:17 sbin drwxr-xr-x 2 root root 4096 Mar 5 2012 selinux drwxr-xr-x 2 root root 4096 Feb 3 15:14 srv drwxr-xr-x 2 root root 4096 Apr 14 2012 sys drwxrwxrwt 2 root root 4096 Feb 4 21:17 tmp drwxr-xr-x 10 root root 4096 Feb 3 15:14 usr drwxr-xr-x 11 root root 4096 Feb 3 18:52 var