dynamically get the nodeport host

Signed-off-by: Hong Yao <[email protected]>

docs/examples/kubevirt.md

@@ -40,6 +40,9 @@ rules:
   - apiGroups: [""]
     resources: ["services"]
     verbs: ["get", "list", "watch", "create", "delete", "patch", "edit"]
+  - apiGroups: [""]
+    resources: ["pods"]
+    verbs: ["get", "list"]
 ---
 apiVersion: rbac.authorization.k8s.io/v1
 kind: RoleBinding
@@ -67,17 +70,17 @@ You will need to substitute the following placeholders:
 
 - This example is using ephemeral VMs, which enhance the speed of VM creation and cleanup. However, it is important to note that any data in the system will not be retained if the VM is rebooted.
 - You don't need to worry about setting up SSH keys. The `create.yml` Ansible playbook takes care of configuring a temporary SSH key.
+- The hostname for SSH connection to the VM is fetched dynamically, which is the K8S node where the VM is running.
 
 ## Config playbook
 
 ```yaml title="molecule.yml"
 {!../molecule/kubevirt/molecule.yml!}
 ```
 
-Please, replace the following parameters:
+Please, replace the following parameter:
 
 - `<Kubernetes VM Namespace>`: This should be replaced with the namespace in Kubernetes where you intend to create the KubeVirt VMs.
-- `<Kubernetes Node FQDN>`: Change this to the fully qualified domain name (FQDN) of the Kubernetes node that Ansible will attempt to SSH into via the Service NodePort.
 
 ```yaml title="requirements.yml"
 {!../molecule/kubevirt/requirements.yml!}

molecule/kubevirt/destroy.yml

@@ -14,7 +14,7 @@
       loop_control:
         loop_var: vm
 
-    - name: Delete VM Instance in KubeVirt
+    - name: Delete NodePort Service in KubeVirt
       kubernetes.core.k8s:
         state: absent
         kind: Service

molecule/kubevirt/molecule.yml

@@ -10,15 +10,13 @@ platforms:
     namespace: <Kubernetes VM Namespace>
     ssh_service:
       type: NodePort
-      nodeport_host: <Kubernetes Node FQDN>
     ansible_user: cloud-user
     memory: 1Gi
   - name: rhel8
     image: registry.redhat.io/rhel8/rhel-guest-image
     namespace: <Kubernetes VM Namespace>
     ssh_service:
       type: NodePort
-      nodeport_host: <Kubernetes Node FQDN>
     ansible_user: cloud-user
     memory: 1Gi
 provisioner:

molecule/kubevirt/tasks/create_vm.yml

@@ -57,3 +57,16 @@
                       - [ sudo, yum, install, -y, qemu-guest-agent ]  # Installs qemu-guest-agent
                       - [ sudo, systemctl, start, qemu-guest-agent ]  # Starts qemu-guest-agent
                 name: cloudinitdisk
+
+- name: Fetch VM pod info
+  kubernetes.core.k8s_info:
+    api_version: v1
+    kind: Pod
+    label_selectors:
+      - "vm.kubevirt.io/name={{ vm.name }}"
+    namespace: "{{ vm.namespace }}"
+  register: vm_pod_info
+
+- name: Extract the nodename from the VM pod info
+  ansible.builtin.set_fact:
+    nodeport_host: "{{ vm_pod_info.resources | map(attribute='spec.nodeName') | list | first }}"

molecule/kubevirt/tasks/create_vm_dictionary.yml

@@ -17,8 +17,8 @@
       {{
         molecule_systems | default({}) | combine({
           vm.name: {
-            'ansible_user': 'cloud-user',
-            'ansible_host': vm.ssh_service.nodeport_host,
+            'ansible_user': vm.ansible_user,
+            'ansible_host': nodeport_host,
             'ansible_ssh_port': ssh_service_address,
             'ansible_ssh_private_key_file': tempoary_ssh_key_path
           }