okd/README_CONTAINER_IMAGE.md

Containerized openshift-ansible to run playbooks

The Dockerfile in this repository uses the playbook2image source-to-image base image to containerize openshift-ansible. The resulting image can run any of the provided playbooks.

Note: at this time there are known issues that prevent to run this image for installation/upgrade purposes from within one of the hosts that is also an installation target at the same time: if the playbook you want to run attempts to manage the docker daemon and restart it (like install/upgrade playbooks do) this would kill the container itself during its operation.

Build

To build a container image of openshift-ansible:

1. Using standalone Docker:

   cd openshift-ansible
   docker build -t openshift-ansible .
   

2. Using an OpenShift build:

   oc new-build docker.io/aweiteka/playbook2image~https://github.com/openshift/openshift-ansible
   oc describe imagestream openshift-ansible
   

Usage

The base image provides several options to control the behaviour of the containers. For more details on these options see the playbook2image documentation.

At the very least, when running a container using an image built this way you must specify:

1. The playbook to run. This is set using the PLAYBOOK_FILE environment variable.
2. An inventory file. This can be mounted inside the container as a volume and specified with the INVENTORY_FILE environment variable. Alternatively you can serve the inventory file from a web server and use the INVENTORY_URL environment variable to fetch it.
3. ssh keys so that Ansible can reach your hosts. These should be mounted as a volume under /opt/app-root/src/.ssh

Here is an example of how to run a containerized openshift-ansible playbook that will check the expiration dates of OpenShift's internal certificates using the openshift_certificate_expiry role. The inventory and ssh keys are mounted as volumes (the latter requires setting the uid in the container and SELinux label in the key file via :Z so they can be accessed) and the PLAYBOOK_FILE environment variable is set to point to an example certificate check playbook that is already part of the image:

docker run -u `id -u` \
       -v $HOME/.ssh/id_rsa:/opt/app-root/src/.ssh/id_rsa:Z \
       -v /etc/ansible/hosts:/tmp/inventory \
       -e INVENTORY_FILE=/tmp/inventory \
       -e OPTS="-v" \
       -e PLAYBOOK_FILE=playbooks/certificate_expiry/default.yaml \
       openshift-ansible

The playbook2image examples provide additional information on how to use a built image.