Merge pull request #124 from utilitywarehouse/kubelet-node-name

Override hostname on kubelet

Author: alkar

master.tf

@@ -218,6 +218,7 @@ data "template_file" "master-kubelet" {
   vars = {
     kubelet_binary_path = "/opt/bin/kubelet"
     cloud_provider      = var.cloud_provider
+    get_hostname        = var.node_name_command[var.cloud_provider]
   }
 }
 

resources/master-kubelet.service

@@ -3,6 +3,10 @@ Description=Kubernetes Kubelet
 Requires=docker.service
 After=docker.service
 [Service]
+EnvironmentFile=-/etc/kubernetes/config/kubeletenv
+ExecStartPre=/usr/bin/mkdir -p /etc/kubernetes/config
+ExecStartPre=/usr/bin/truncate -s0 /etc/kubernetes/config/kubeletenv
+ExecStartPre=/bin/sh -c 'echo "NODE_HOSTNAME=$(${get_hostname})" >> /etc/kubernetes/config/kubeletenv'
 ExecStartPre=/usr/bin/mkdir -p /etc/kubernetes/manifests
 ExecStartPre=/usr/bin/mkdir -p /var/log/containers
 ExecStartPre=/usr/bin/mkdir -p /opt/cni/bin
@@ -18,6 +22,7 @@ ExecStartPre=/sbin/sysctl -w net.ipv4.tcp_retries2=8
 ExecStartPre=/sbin/sysctl -w fs.inotify.max_user_watches=524288
 ExecStart=${kubelet_binary_path} \
   --config=/etc/kubernetes/config/master-kubelet-conf.yaml \
+  --hostname-override="$${NODE_HOSTNAME}" \
   --kubeconfig=/var/lib/kubelet/kubeconfig \
   --node-labels=role=master \
   --register-with-taints=node-role.kubernetes.io/master=:NoSchedule \

resources/node-kubelet.service

@@ -3,6 +3,10 @@ Description=Kubernetes Kubelet
 Requires=docker.service
 After=docker.service
 [Service]
+EnvironmentFile=-/etc/kubernetes/config/kubeletenv
+ExecStartPre=/usr/bin/mkdir -p /etc/kubernetes/config
+ExecStartPre=/usr/bin/truncate -s0 /etc/kubernetes/config/kubeletenv
+ExecStartPre=/bin/sh -c 'echo "NODE_HOSTNAME=$(${get_hostname})" >> /etc/kubernetes/config/kubeletenv'
 ExecStartPre=/usr/bin/mkdir -p /etc/kubernetes/manifests
 ExecStartPre=/usr/bin/mkdir -p /var/log/containers
 ExecStartPre=/usr/bin/mkdir -p /opt/cni/bin
@@ -24,6 +28,7 @@ ExecStart=${kubelet_binary_path} \
   --config=/etc/kubernetes/config/node-kubelet-conf.yaml \
   --container-runtime=docker \
   --exit-on-lock-contention \
+  --hostname-override="$${NODE_HOSTNAME}" \
   --kubeconfig=/var/lib/kubelet/kubeconfig \
   --network-plugin=cni \
   --node-labels=${labels} \

storage-node.tf

@@ -9,6 +9,7 @@ data "template_file" "storage-node-kubelet" {
   vars = {
     kubelet_binary_path = "/opt/bin/kubelet"
     cloud_provider      = var.cloud_provider
+    get_hostname        = var.node_name_command[var.cloud_provider]
     labels              = "role=storage-node,node.longhorn.io/create-default-disk=true"
     taints              = "storage=longhorn:NoSchedule"
   }

worker.tf

@@ -9,6 +9,7 @@ data "template_file" "worker-kubelet" {
   vars = {
     kubelet_binary_path = "/opt/bin/kubelet"
     cloud_provider      = var.cloud_provider
+    get_hostname        = var.node_name_command[var.cloud_provider]
     labels              = "role=worker"
     taints              = ""
   }