add: validation before joining to cluster

roles/cluster_workers_join/tasks/main.yaml

@@ -1,30 +1,40 @@
 ---
-# TODO: check is worker already joined
-
-- name: Get join command
-  become: true
-  delegate_to: "{{ cluster_workers_join_first_control_plane.ipv4 | split('/') | first }}"
+- name: Get cluster nodes
+  delegate_to: kvm_host_local
+  connection: local
   changed_when: true
-  register: result
+  register: cluster_workers_join_result
   ansible.builtin.command:
-    cmd: >
-      kubeadm token create --print-join-command
+    cmd: kubectl get nodes
 
-- name: Set fact join command
-  register: result
-  until: result is not failed
-  retries: 25
-  delay: 10
-  ansible.builtin.set_fact:
-    cluster_workers_join_command: /usr/bin/{{ result.stdout }}
+- name: Join to cluster
+  when: inventory_hostname not in cluster_workers_join_result.stdout
+  block:
 
-- name: Join to the cluster
-  become: true
-  changed_when: true
-  register: result
-  until: result is not failed
-  retries: 25
-  delay: 10
-  ansible.builtin.command:
-    cmd: >
-      {{ cluster_workers_join_command }}
+    - name: Get join command
+      become: true
+      delegate_to: "{{ cluster_workers_join_first_control_plane.ipv4 | split('/') | first }}"
+      changed_when: true
+      register: result
+      ansible.builtin.command:
+        cmd: >
+          kubeadm token create --print-join-command
+
+    - name: Set fact join command
+      register: result
+      until: result is not failed
+      retries: 25
+      delay: 10
+      ansible.builtin.set_fact:
+        cluster_workers_join_command: /usr/bin/{{ result.stdout }}
+
+    - name: Join to the cluster
+      become: true
+      changed_when: true
+      register: result
+      until: result is not failed
+      retries: 25
+      delay: 10
+      ansible.builtin.command:
+        cmd: >
+          {{ cluster_workers_join_command }}