Fix dual-stack clusters with multiple master nodes (#237)

* Test IPv6 scenario with two master nodes

* Fix IPv6 multimaster setup

---------

Co-authored-by: Techno Tim <timothystewart6@gmail.com>

molecule/ipv6/host_vars/control2.yml

@@ -0,0 +1,3 @@
+---
+node_ipv4: 192.168.123.12
+node_ipv6: fdad:bad:ba55::de:12

molecule/ipv6/molecule.yml

@@ -4,7 +4,6 @@ dependency:
 driver:
   name: vagrant
 platforms:
-
   - name: control1
     box: generic/ubuntu2204
     memory: 2048
@@ -21,6 +20,22 @@ platforms:
       ssh.username: "vagrant"
       ssh.password: "vagrant"
 
+  - name: control2
+    box: generic/ubuntu2204
+    memory: 2048
+    cpus: 2
+    groups:
+      - k3s_cluster
+      - master
+    interfaces:
+      - network_name: private_network
+        ip: fdad:bad:ba55::de:12
+    config_options:
+      # We currently can not use public-key based authentication on Ubuntu 22.04,
+      # see: https://github.com/chef/bento/issues/1405
+      ssh.username: "vagrant"
+      ssh.password: "vagrant"
+
   - name: node1
     box: generic/ubuntu2204
     memory: 2048

roles/k3s/master/defaults/main.yml

@@ -9,7 +9,7 @@ server_init_args: >-
     {% if ansible_hostname == hostvars[groups['master'][0]]['ansible_hostname'] %}
       --cluster-init
     {% else %}
-      --server https://{{ hostvars[groups['master'][0]].k3s_node_ip }}:6443
+      --server https://{{ hostvars[groups['master'][0]].k3s_node_ip | split(",") | first | ansible.utils.ipwrap }}:6443
     {% endif %}
     --token {{ k3s_token }}
   {% endif %}