kubernetes.core/molecule/default/tasks/exec.yml

---
- vars:
    exec_namespace: k8s-exec
    pod: sleep-pod
    exec_pod_definition:
      apiVersion: v1
      kind: Pod
      metadata:
        name: "{{ pod }}"
        namespace: "{{ exec_namespace }}"
      spec:
        containers:
          - name: sleeper
            image: busybox
            command: ["sleep", "infinity"]

  block:
    - name: "Ensure that {{ exec_namespace }} namespace exists"
      k8s:
        kind: Namespace
        name: "{{ exec_namespace }}"

    - name: "Create a pod"
      k8s:
        definition: "{{ exec_pod_definition }}"
        wait: yes
        wait_sleep: 1
        wait_timeout: 30

    - name: "Execute a command"
      k8s_exec:
        pod: "{{ pod }}"
        namespace: "{{ exec_namespace }}"
        command: cat /etc/resolv.conf
      register: output

    - name: "Show k8s_exec output"
      debug:
        var: output

    - name: "Assert k8s_exec output is correct"
      assert:
        that:
          - "'nameserver' in output.stdout"

    - name: Check if rc is returned for the given command
      k8s_exec:
        namespace: "{{ exec_namespace }}"
        pod: "{{ pod }}"
        command: 'false'
      register: command_status
      ignore_errors: True

    - name: Check last command status
      assert:
        that:
          - command_status.rc != 0
          - command_status.return_code != 0

  always:
    - name: "Cleanup namespace"
      k8s:
        kind: Namespace
        name: "{{ exec_namespace }}"
        state: absent