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Steps to create minimal CentOS 6 container template:

1.Create a directory where the template files will be created

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8. centos-6-x86_64.tar.gz can be registered as a template in CloudStack

Creating template on Ubuntu

1. Install lxc: apt-get install lxc

2. Create  a container with any name, in our case 'ubuntu':
   sudo lxc-create --template=debian --name=ubuntu -- --release=wheezy 

   
   

3. Creation of the LXC container will take a lot of time, it will be stored here: /var/lib/lxc/ubuntu

   
   

4. Next stop the container:
   sudo lxc-stop -n ubuntu

   
   

5. Next create a temp director, tar the rootfs and export the template:
   mkdir -p /tmp/lxc-template
   cd /tmp/lxc-template
   sudo tar --numeric-owner -czf /tmp/lxc-template/template.tar.gz /var/lib/lxc/ubuntu/rootfs/