create CentOS6 containers under Ubuntu 14.04 LXC host

Here's how to create CentOS6 containers under Ubuntu host

Install lxc, lxc-templates and yum on Ubuntu, which is required to run CentOS container.

# tail -1 /etc/lsb-release DISTRIB_DESCRIPTION="Ubuntu 14.04.3 LTS" # uname -ri 3.19.0-33-generic x86_64 # apt-get install lxc lxc-templates yum

template files are located at /usr/share/lxc/templates directory.

# dpkg -L lxc-templates | grep 'templates/' /usr/share/lxc/templates/lxc-gentoo /usr/share/lxc/templates/lxc-centos # ls /usr/share/lxc/templates/ lxc-alpine    lxc-archlinux  lxc-centos  lxc-debian    lxc-fedora  lxc-openmandriva  lxc-oracle  lxc-sshd    lxc-ubuntu-cloud lxc-altlinux  lxc-busybox    lxc-cirros  lxc-download  lxc-gentoo  lxc-opensuse      lxc-plamo   lxc-ubuntu

create a CentOS container.

# /usr/share/lxc/templates/lxc-centos -n centos01 -R 6.7 Host CPE ID from /etc/os-release: Checking cache download in /var/cache/lxc/centos/x86_64/6.7/rootfs ... Downloading centos minimal ... Fixing rpmdb location ... Download complete. Copy /var/cache/lxc/centos/x86_64/6.7/rootfs to /var/lib/lxc/centos01/rootfs ... Copying rootfs to /var/lib/lxc/centos01/rootfs ... Storing root password in '/var/lib/lxc/centos01/tmp_root_pass' Expiring password for user root. passwd: Success Container rootfs and config have been created. Edit the config file to check/enable networking setup. The temporary root password is stored in:        '/var/lib/lxc/centos01/tmp_root_pass' The root password is set up as expired and will require it to be changed at first login, which you should do as soon as possible.  If you lose the root password or wish to change it without starting the container, you can change it from the host by running the following command (which will also reset the expired flag):        chroot /var/lib/lxc/centos01/rootfs passwd

change container’s root password, if you would like.

#  chroot /var/lib/lxc/centos01/rootfs passwd

or

You can also create a CentOS container via lxc-create with ‘-t’ opton.

# lxc-create -t centos -n centos02 Host CPE ID from /etc/os-release: This is not a CentOS or Redhat host and release is missing, defaulting to 6 use -R|--release to specify release Checking cache download in /var/cache/lxc/centos/x86_64/6/rootfs ... Cache found. Updating... Loaded plugins: fastestmirror

run the container

# lxc-start -n centos02 –d

access to the container.

# lxc-attach -n centos02

[root@centos02 ~]# cat /etc/centos-release CentOS release 6.7 (Final) [root@centos02 ~]# uname -a Linux centos02 3.19.0-33-generic #38~14.04.1-Ubuntu SMP Fri Nov 6 18:17:28 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux