Trishna Guha: Customize Packages for Atomic Host : Ansible Automation

My earlier post automate-building-your-own-atomic-host describes how to Automate building Atomic Host with Ansible. But it is not capable of customizing packages for OSTree and build Atomic host based on it.

This post includes Ansible Automation for customizing packages of OSTree and build Atomic Host. Below are the improvements on this updated post :

  • Add packages to OSTree (It is suggested not to delete any pre-existing packages from the OSTree, that might break your Atomic host).
  • No need to create VM from the QCOW2 image will shell script anymore, It will be now all-in-one playbook.

If you do not know about Atomic host, please refer to


The requirements remain the same just like the earlier post. I will use Fedora distribution for the demo, but the same will be applicable for CentOS as well.

  • Make sure Ansible is installed on your system. If you are using Fedora workstation/any other platform, do not forget to install python2-dnf as well.
  • Download Atomic QCOW2 image: Fedora-Atomic.



$ git clone
$ cd build-atomic-host/

Environment Setup:

The following will install requirements on your system, initializes OSTree and starts HTTP server as daemon service. The OSTree is made available via web server at TCP port 35000. After running the playbook you may use ip addr to check the IP Address of your HTTP server.

$ ansible-playbook setup.yml --ask-sudo-pass


I am going to use variables applicable for Fedora. If you are using CentOS please modify the variables based on it.

  • Primary Variables.
# Variables for Atomic host
atomicname: my-atomic                          # OSTree name
basehost: fedora-atomic/25/x86_64/docker-host  # Basehost
httpserver:                      # IP Address of HTTP Server
  • Additional packages you would like to have in your OSTree.
# Variables for OSTree packages
branch: f25
repodir: fedora-atomic
abs_path: /workspace                                # The absolute path to the git repo.
custommanifest: customized-atomic-docker-host.json  # The manifest that goes into the custom host(ostree) content that we are going to build.
sourcemanifest: fedora-atomic-docker-host.json      # The manifest that goes into the actual Base Fedora host(ostree) content.
packages: '"vim-enhanced", "git"'                   # Packages you want to have in your Atomic host.

Add packages like above separate by comma.

  • Variables for the VM
# Variables for Creating VM
domain: atomic-node                        # Domain name
image: Fedora-Atomic-25-20170228.0.x86_64  # Image name
cpu: 1
mem: 1536
  variant: fedora23
path: /tmp                                 # Path to QCOW2 Image

Main Playbook:

Run the main Playbook which will create VM from QCOW2 image, compose OSTree and perform SSH-Setup and Rebase on OSTree:

$ ansible-playbook main.yml --ask-sudo-pass

Note: user-name: atomic-user, password: atomic are the credentials for the instance.
If you wish to change it, modify the cloud-init user-data.
We will have the credentials as variables/vault later.

To Check the IP Address of the VM running:

$ sudo virsh domifaddr atomic-node

Now SSH to the Atomic host and perform Reboot so that it will reboot in to custom OSTree.

$ ssh atomic-user@IP-ADDRESS-OF-VM
$ sudo systemctl reboot

SSH again and You will have your own OSTRee.

[atomic-user@atomic-node ~]$ sudo rpm-ostree status
State: idle
● my-atomic:fedora-atomic/25/x86_64/docker-host
       Version: 25.1 (2017-02-07 05:34:46)
        Commit: 15b70198b8ec7fd54271f9672578544ff03d1f61df8d7f0fa262ff7519438eb6
        OSName: fedora-atomic

       Version: 25.51 (2017-01-30 20:09:59)
        Commit: f294635a1dc62d9ae52151a5fa897085cac8eaa601c52e9a4bc376e9ecee11dd
        OSName: fedora-atomic
[atomic-user@atomic-node ~]$ rpm -q git vim-enhanced

If you find any bug/idea please open up issues here. Thanks.


Source From:
Original article title: Trishna Guha: Customize Packages for Atomic Host : Ansible Automation.
This full article can be read at: Trishna Guha: Customize Packages for Atomic Host : Ansible Automation.


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