Openshift installation on GCE using terraform

I wanted to try to install openshift on a GCE cluster with the official “ansible installer” available on github Nevertheless I did not manage to have the installer creating the VM on GCE and I’m not even sure it is possible (even if it seems based on libcloud). In the meantime I discover Terraform which allow describing an infrastructure in a common language and deploying it on multiple cloud (including GCE and AWS).

Finally I decided to work on a project that will include these 2 topics “Openshift installation with ansible” and “infrastructure creation with terrafrom”.
I did not had to search too long before I found an open source project that aim to do that:

“This repo contains Ansible and terraform scripts for installing openshift onto OpenStack or AWS EC2.

The repo is organized into the different deployment models. Currently tested with EC2 and OpenStack, but can be extended to Google Compute, Digital Ocean, etc. Happy to take pull requests for additional infrastructure.”

That was perfect since I wanted to use GCE. I decided to contribute to this project by adding the GCE support.

Here is an overview of the whole process (more detail on the github project) :

  1. Used Terrafrom to create the VMs cluster on the cloud
    this is based on an Infrastructure file and Terrafrom.
  2. Use Ansible to customize the VMs
    this part use Ansible and an external Opensource project made by cisco to create dynamically a Ansible Inventory file from the Terrafrom files: This is not obvious today since the Cisco code is copied in the repo (see my comment later)
  3. Use the Openshift-Ansible installer to install Openshift on these VMs
    This part use the official installer but require a manual action first to create the ansible inventory file.

Remove static “” script

During my changes on the repo I noticed that it was relying on an Cisco project to create an Ansible inventory from the Terrafrom files. Nevertheless instead of cloning the cisco repo (like it is done for Openshift-Ansible Repo) it was committed.
I think it was done like this since the original creator was thinking to modify it later on but for now it prevent us to benefit from the changes done on the official github repository of Cisco. This is particularly true for my usecase since there was a bug preventing to create the inventory file for GCE in the actual version (but fix on the github last versions).
I thus decided first to create a PR to clone the Cisco repo in the procedure and remove the old version which was committed.

GCE Terrafrom integration