Fix CNI: configure flannel to use private network interface (enp7s0) instead of public

ansible/roles/k3s-agent/tasks/main.yml

@@ -22,6 +22,7 @@
       command: >-
         /tmp/install-k3s.sh agent
         --node-ip {{ k3s_node_ip }}
+        --flannel-iface=enp7s0
         {% if k3s_kubelet_cloud_provider_external | bool %}--kubelet-arg=cloud-provider=external{% endif %}
       args:
         creates: /usr/local/bin/k3s-agent

ansible/roles/k3s-server/tasks/main.yml

@@ -61,6 +61,7 @@
     --cluster-init
     --advertise-address={{ k3s_primary_ip }}
     --node-ip={{ k3s_node_ip }}
+    --flannel-iface=enp7s0
     --tls-san={{ k3s_primary_ip }}
     --tls-san={{ k3s_primary_public_ip }}
     --tls-san={{ kube_api_endpoint }}
@@ -86,6 +87,7 @@
         --server https://{{ k3s_join_endpoint | default(k3s_primary_ip) }}:6443
         --advertise-address={{ k3s_node_ip }}
         --node-ip={{ k3s_node_ip }}
+        --flannel-iface=enp7s0
         {% if k3s_disable_embedded_ccm | bool %}--disable-cloud-controller{% endif %}
         {% if k3s_disable_servicelb | bool %}--disable=servicelb{% endif %}
         {% if k3s_kubelet_cloud_provider_external | bool %}--kubelet-arg=cloud-provider=external{% endif %}