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

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

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

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

    - name: Execute a command
      k8s_exec:
        pod: "{{ pod }}"
        namespace: "{{ ns }}"
        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: Cleanup namespace
      k8s:
        kind: Namespace
        name: "{{ ns }}"
        state: absent