Set host IP for kubelet always (#1924)

* Set host IP for kubelet always

Use ansible default IP if ip var is not set.

* Update main.yml

roles/kubernetes/node/defaults/main.yml

@@ -5,6 +5,12 @@ kubelet_deployment_type: host
 # change to 0.0.0.0 to enable insecure access from anywhere (not recommended)
 kube_apiserver_insecure_bind_address: 127.0.0.1
 
+# advertised host IP for kubelet. This affects network plugin config. Take caution
+kubelet_address: "{{ ip | default(ansible_default_ipv4['address']) }}"
+
+# bind address for kubelet. Set to 0.0.0.0 to listen on all interfaces
+kubelet_bind_address: "{{ ip | default('0.0.0.0') }}"
+
 # resolv.conf to base dns config
 kube_resolv_conf: "/etc/resolv.conf"
 

roles/kubernetes/node/templates/kubelet.kubeadm.env.j2

@@ -5,7 +5,7 @@
 KUBE_LOGTOSTDERR="--logtostderr=true"
 KUBE_LOG_LEVEL="--v={{ kube_log_level }}"
 # The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)
-KUBELET_ADDRESS="--address={{ ip | default("0.0.0.0") }} {% if ip is defined %} --node-ip={{ ip }}{% endif %}"
+KUBELET_ADDRESS="--address={{ kubelet_bind_address }} --node-ip={{ kubelet_address }}"
 # The port for the info server to serve on
 # KUBELET_PORT="--port=10250"
 # You may leave this blank to use the actual hostname

roles/kubernetes/node/templates/kubelet.standard.env.j2

@@ -2,7 +2,7 @@
 KUBE_LOGTOSTDERR="--logtostderr=true"
 KUBE_LOG_LEVEL="--v={{ kube_log_level }}"
 # The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)
-KUBELET_ADDRESS="--address={{ ip | default("0.0.0.0") }} {% if ip is defined %} --node-ip={{ ip }}{% endif %}"
+KUBELET_ADDRESS="--address={{ kubelet_bind_address }} --node-ip={{ kubelet_address }}"
 # The port for the info server to serve on
 # KUBELET_PORT="--port=10250"
 # You may leave this blank to use the actual hostname