kubespray/roles/container-engine/validate-container-engine/tasks/main.yml

---
- name: Validate-container-engine | check if fedora coreos
  stat:
    path: /run/ostree-booted
    get_attributes: false
    get_checksum: false
    get_mime: false
  register: ostree
  tags:
    - facts

- name: Validate-container-engine | set is_ostree
  set_fact:
    is_ostree: "{{ ostree.stat.exists }}"
  tags:
    - facts

- name: Ensure kubelet systemd unit exists
  stat:
    path: "/etc/systemd/system/kubelet.service"
  register: kubelet_systemd_unit_exists
  tags:
    - facts

- name: Populate service facts
  service_facts:
  tags:
    - facts

- name: Check if containerd is installed
  find:
    file_type: file
    recurse: true
    use_regex: true
    patterns:
      - containerd.service$
    paths:
      - /lib/systemd
      - /etc/systemd
      - /run/systemd
  register: containerd_installed
  tags:
    - facts

- name: Check if docker is installed
  find:
    file_type: file
    recurse: true
    use_regex: true
    patterns:
      - docker.service$
    paths:
      - /lib/systemd
      - /etc/systemd
      - /run/systemd
  register: docker_installed
  tags:
    - facts

- name: Check if crio is installed
  find:
    file_type: file
    recurse: true
    use_regex: true
    patterns:
      - crio.service$
    paths:
      - /lib/systemd
      - /etc/systemd
      - /run/systemd
  register: crio_installed
  tags:
    - facts

- name: Uninstall containerd
  vars:
    service_name: containerd.service
  when:
    - not (is_ostree or (ansible_distribution == "Flatcar Container Linux by Kinvolk") or (ansible_distribution == "Flatcar"))
    - container_manager != "containerd"
    - docker_installed.matched == 0
    - containerd_installed.matched > 0
    - ansible_facts.services[service_name]['state'] == 'running'
  block:
    - name: Drain node
      include_role:
        name: remove-node/pre-remove
        apply:
          tags:
            - pre-remove
      when: kubelet_systemd_unit_exists.stat.exists
    - name: Stop kubelet
      service:
        name: kubelet
        state: stopped
      when: kubelet_systemd_unit_exists.stat.exists
    - name: Remove Containerd
      import_role:
        name: container-engine/containerd
        tasks_from: reset
        handlers_from: reset

- name: Uninstall docker
  vars:
    service_name: docker.service
  when:
    - not (is_ostree or (ansible_distribution == "Flatcar Container Linux by Kinvolk") or (ansible_distribution == "Flatcar"))
    - container_manager != "docker"
    - docker_installed.matched > 0
    - ansible_facts.services[service_name]['state'] == 'running'
  block:
    - name: Drain node
      include_role:
        name: remove-node/pre-remove
        apply:
          tags:
            - pre-remove
      when: kubelet_systemd_unit_exists.stat.exists
    - name: Stop kubelet
      service:
        name: kubelet
        state: stopped
      when: kubelet_systemd_unit_exists.stat.exists
    - name: Remove Docker
      import_role:
        name: container-engine/docker
        tasks_from: reset

- name: Uninstall crio
  vars:
    service_name: crio.service
  when:
    - not (is_ostree or (ansible_distribution == "Flatcar Container Linux by Kinvolk") or (ansible_distribution == "Flatcar"))
    - container_manager != "crio"
    - crio_installed.matched > 0
    - ansible_facts.services[service_name]['state'] == 'running'
  block:
    - name: Drain node
      include_role:
        name: remove-node/pre-remove
        apply:
          tags:
            - pre-remove
      when: kubelet_systemd_unit_exists.stat.exists
    - name: Stop kubelet
      service:
        name: kubelet
        state: stopped
      when: kubelet_systemd_unit_exists.stat.exists
    - name: Remove CRI-O
      import_role:
        name: container-engine/cri-o
        tasks_from: reset