Integrate SkyDNS in libvirt-coreos

cluster/libvirt-coreos/config-default.sh

@@ -54,3 +54,9 @@ ENABLE_NODE_MONITORING=true
 # Optional: Enable node logging.
 ENABLE_NODE_LOGGING=false
 LOGGING_DESTINATION=elasticsearch
+
+# Optional: Install cluster DNS.
+ENABLE_CLUSTER_DNS=true
+DNS_SERVER_IP="10.11.0.254"
+DNS_DOMAIN="kubernetes.local"
+DNS_REPLICAS=1

cluster/libvirt-coreos/skydns-rc.yaml

@@ -0,0 +1,44 @@
+kind: ReplicationController
+apiVersion: v1beta1
+id: skydns
+namespace: default
+labels:
+  k8s-app: skydns
+desiredState:
+  replicas: ${DNS_REPLICAS}
+  replicaSelector:
+    k8s-app: skydns
+  podTemplate:
+    labels:
+      k8s-app: skydns
+    desiredState:
+      manifest:
+        version: v1beta2
+        id: skydns
+        dnsPolicy: "Default"  # Don't use cluster DNS.
+        containers:
+          - name: etcd
+            image: quay.io/coreos/etcd:latest
+            command: [
+                    \"/etcd\",
+                    \"-bind-addr=127.0.0.1\",
+                    \"-peer-bind-addr=127.0.0.1\",
+            ]
+          - name: kube2sky
+            image: kubernetes/kube2sky:1.0
+            command: [
+                    # entrypoint = \"/kube2sky\",
+                    \"-domain=${DNS_DOMAIN}\",
+            ]
+          - name: skydns
+            image: kubernetes/skydns:2014-12-23-001
+            command: [
+                    # entrypoint = \"/skydns\",
+                    \"-machines=http://localhost:4001\",
+                    \"-addr=0.0.0.0:53\",
+                    \"-domain=${DNS_DOMAIN}.\",
+            ]
+            ports:
+              - name: dns
+                containerPort: 53
+                protocol: UDP

cluster/libvirt-coreos/skydns-svc.yaml

@@ -0,0 +1,12 @@
+kind: Service
+apiVersion: v1beta1
+id: skydns
+namespace: default
+protocol: UDP
+port: 53
+portalIP: ${DNS_SERVER_IP}
+containerPort: 53
+labels:
+  k8s-app: skydns
+selector:
+  k8s-app: skydns

cluster/libvirt-coreos/user_data_master.yml

@@ -59,5 +59,25 @@ coreos:
         Restart=always
         RestartSec=2
 
+        [Install]
+        WantedBy=multi-user.target
+    - name: kube-addons.service
+      command: start
+      content: |
+        [Unit]
+        After=opt-kubernetes.mount kube-apiserver.service
+        ConditionPathIsDirectory=/opt/kubernetes/addons
+        Description=Kubernetes addons
+        Documentation=https://github.com/GoogleCloudPlatform/kubernetes
+        Requires=opt-kubernetes.mount kube-apiserver.service
+
+        [Service]
+        Type=oneshot
+        ExecStartPre=/bin/bash -c 'while [[ \"\$(curl -s http://127.0.0.1:8080/healthz)\" != \"ok\" ]]; do sleep 1; done'
+        ExecStartPre=/bin/sleep 10
+        ExecStart=/opt/kubernetes/bin/kubectl create -f /opt/kubernetes/addons
+        ExecStop=/opt/kubernetes/bin/kubectl stop -f /opt/kubernetes/addons
+        RemainAfterExit=yes
+
         [Install]
         WantedBy=multi-user.target

cluster/libvirt-coreos/user_data_minion.yml

@@ -17,6 +17,9 @@ coreos:
         --address=0.0.0.0 \
         --hostname_override=${MINION_IPS[$i]} \
         --etcd_servers=http://127.0.0.1:4001 \
+        --api_servers=http://${MASTER_IP}:8080 \
+        $( [[ "$ENABLE_CLUSTER_DNS" == "true" ]] && echo "--cluster_dns=${DNS_SERVER_IP}" ) \
+        $( [[ "$ENABLE_CLUSTER_DNS" == "true" ]] && echo "--cluster_domain=${DNS_DOMAIN}" ) \
         --config=/opt/kubernetes/manifests
         Restart=always
         RestartSec=2

cluster/libvirt-coreos/util.sh

@@ -137,6 +137,12 @@ function initialize-pool {
       fi
   fi
 
+  mkdir -p "$POOL_PATH/kubernetes/addons"
+  if [[ "$ENABLE_CLUSTER_DNS" == "true" ]]; then
+      render-template "$ROOT/skydns-svc.yaml" > "$POOL_PATH/kubernetes/addons/skydns-svc.yaml"
+      render-template "$ROOT/skydns-rc.yaml"  > "$POOL_PATH/kubernetes/addons/skydns-rc.yaml"
+  fi
+
   virsh pool-refresh $POOL
 }