Configuring garbage collection in OCP3, an example of appending to YAML in Ansible

ocp3-garbage-collection.yml

---
# Configuring garbage collection in OCP3, an example of appending to YAML in Ansible
# Lucian Maly - Red Hat, Inc.
- name: Configuring garbage collection in OCP3
  hosts: masters[0]
  gather_facts: no
  tasks:
    - name: 1.0 | ocp3-garbage-collection.yml | Download the content of a ConfigMap
      shell: |
        oc extract cm/node-config-compute --to=/root --confirm=true -n openshift-node

    - name: 1.1 | ocp3-garbage-collection.yml | Read the node-config.yaml
      slurp:
        path: /root/node-config.yaml
      register: r_myfile

    - name: 1.2 | ocp3-garbage-collection.yml | Extract the data of node-config.yaml
      set_fact:
        mydata: "{{ r_myfile['content'] | b64decode | from_yaml }}"

    - name: 1.3 | ocp3-garbage-collection.yml | Append new garbage collection options to Kubelet
      set_fact:
        mydata: "{{ mydata | combine(kubelet, recursive=True) }}"
      vars:
        kubelet: 
          kubeletArguments:
            minimum-container-ttl-duration:
            - "0"
            maximum-dead-containers-per-container:
            - "1"
            maximum-dead-containers:
            - "240"

    - name: 1.4 | ocp3-garbage-collection.yml | Cleanup of the original remote file node-config.yaml
      file:
        path: /root/node-config.yaml
        state: absent

    - name: 1.5 | ocp3-garbage-collection.yml | Write back to a file
      copy:
        content: '{{ mydata | to_nice_yaml }}'
        dest: /root/node-config.yaml

    - name: 1.6 | ocp3-garbage-collection.yml | Apply/update the existing ConfigMap in openshift-node
      shell: |
        oc create configmap node-config-compute --from-file=/root/node-config.yaml -n openshift-node --dry-run -o yaml | oc apply -f -

    - name: 1.7 | ocp3-garbage-collection.yml | Cleanup of the new remote file node-config.yaml
      file:
        path: /root/node-config.yaml
        state: absent