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Example of using Ansible to update Container Native Storage

November 29, 2017
Glenn West
Related topics:
KubernetesLinux
Related products:
Red Hat OpenShift Container PlatformStreams for Apache Kafka

Share:

    Container Native Storage (CNS) is implemented in OpenShift as pods. These pods are created from a template that is built into OpenShift. After an automated install, we want to make sure we have the latest template, and the latest containers when using the Advanced Installer. While typically this is a multi-step manual process, an Ansible Script makes this a lot simpler.

    Let's walk through the update using an Ansible script. First, we add the gluster channel on one of the CNS nodes. Next, we will update the herketi client and the CNS deployer. During this update, the gluster OpenShift templates are updated. We need that in order to update the template inside OpenShift. The fetch, with the flat, copies it from the CNS node.

    In the next step, we make sure we are in the right project, and we delete the daemon set. As this is designed to run before a workload is on CNS, we delete the pods and the daemon set.

    The following step deletes the template for Gluster inside of OpenShift.

    In the new version, the nodes are labeled differently. This uses a local_action to run it directly on the bastion host. You will note the command will run multiple times locally with the node names changing.

    At this point, we load the new template and recreate the CNS daemon set.

    The original instructions for this are here in Chapter 13.3. And a gist of the code is here.

    - hosts: cns01
      vars:
        description: "get updated templates for cns"
      tasks:
      - name: add cns channel
        shell: subscription-manager repos --enable=rh-gluster-3-for-rhel-7-server-rpms
      - name: install latest cns-deploy package
        yum: name="cns-deploy" state=latest
      - name: install latest herketi packages
        yum: name="heketi-client" state=latest
      - name: remove cns channel
        shell: subscription-manager repos --disable=rh-gluster-3-for-rhel-7-server-rpms
      - name: Copy templates from cns01 to bastion for /usr/share/heketi/templates
        fetch:
          src:  /usr/share/heketi/templates/glusterfs-template.yaml
          dest: glusterfs-template.yaml
          flat: yes
    - hosts: master1
      tasks:
      - name: use gluster project
        shell: oc project glusterfs
      - name: delete daemon set
        command: oc delete ds glusterfs
        ignore_errors: yes
      - name: Delete Old Templates
        shell:  oc delete templates glusterfs
        ignore_errors: yes
    - hosts: glusterfs
      tasks:
      - name: relabel nodes
        local_action: command oc label nodes {{ansible_hostname}} storagenode=glusterfs --overwrite
    - hosts: localhost
      tasks:
      - name: Use new template
        local_action: command  oc create -f glusterfs-template.yaml
      - name: Wait for distribution of template
        pause:
          seconds: 10
      - name: Deploy the template
        local_action: shell oc process glusterfs | oc create -f -

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    Last updated: September 3, 2019

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