gpu-k8s: precheck SSH connectivity

playbooks/roles/vhosts/gpu-k8s/tasks/install_cluster.yml

@@ -72,6 +72,15 @@
     fail_msg: "Provide masters/nodes hostnames or master_ips/node_ips with at least one entry"
   when: inventory_hostname == (ops_host | default(masters | default(master_ips) | first))
 
+- name: Verify passwordless SSH access to all cluster nodes
+  shell: ssh -o BatchMode=yes -o StrictHostKeyChecking=no root@{{ item }} hostname
+  loop: "{{ master_ips + node_ips }}"
+  delegate_to: "{{ ops_host | default(masters | default(master_ips) | first) }}"
+  become: false
+  register: ssh_access
+  changed_when: false
+  run_once: true
+
 - name: Run sealos to create Kubernetes cluster
   shell: |
     sealos run \