coreos/azure: Make etcd cluster scalable

docs/getting-started-guides/coreos/azure/cloud_config_templates/kubernetes-cluster-etcd-node-template.yml

@@ -39,7 +39,6 @@ coreos:
         Environment=ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379,http://0.0.0.0:4001
         Environment=ETCD_ADVERTISE_CLIENT_URLS=http://%H:2379,http://%H:4001
         Environment=ETCD_INITIAL_CLUSTER_STATE=new
-        Environment=ETCD_INITIAL_CLUSTER=etcd-00=http://etcd-00:2380,etcd-01=http://etcd-01:2380,etcd-02=http://etcd-02:2380
         ExecStart=/opt/bin/etcd2
         Restart=always
         RestartSec=10

docs/getting-started-guides/coreos/azure/cloud_config_templates/kubernetes-cluster-main-nodes-template.yml

@@ -244,7 +244,7 @@ coreos:
         ExecStart=/opt/kubernetes/server/bin/kube-apiserver \
             --address=0.0.0.0 \
             --port=8080 \
-            --etcd_servers=http://etcd-00:4001,http://etcd-01:4001,http://etcd-02:4001 \
+            $ETCD_SERVERS \
             --portal_net=10.1.0.0/16 \
             --cloud_provider=vagrant \
             --logtostderr=true --v=3

docs/getting-started-guides/coreos/azure/lib/deployment_logic/kubernetes.js

@@ -5,15 +5,51 @@ var util = require('../util.js');
 var cloud_config = require('../cloud_config.js');
 
 
+etcd_initial_cluster_conf_self = function (conf) {
+  var port = '2380';
+
+  var data = {
+    nodes: _(conf.nodes.etcd).times(function (n) {
+      var host = util.hostname(n, 'etcd');
+      return [host, [host, port].join(':')].join('=http://');
+    }),
+  };
+
+  return {
+    'name': 'etcd2.service',
+    'drop-ins': [{
+      'name': '50-etcd-initial-cluster.conf',
+      'content': _.template("[Service]\nEnvironment=ETCD_INITIAL_CLUSTER=<%= nodes.join(',') %>\n")(data),
+    }],
+  };
+};
+
+etcd_initial_cluster_conf_kube = function (conf) {
+  var port = '4001';
+
+  var data = {
+    nodes: _(conf.nodes.etcd).times(function (n) {
+      var host = util.hostname(n, 'etcd');
+      return 'http://' + [host, port].join(':');
+    }),
+  };
+
+  return {
+    'name': 'apiserver.service',
+    'drop-ins': [{
+      'name': '50-etcd-initial-cluster.conf',
+      'content': _.template("[Service]\nEnvironment=ETCD_SERVERS=--etcd_servers=<%= nodes.join(',') %>\n")(data),
+    }],
+  };
+};
+
 exports.create_etcd_cloud_config = function (node_count, conf) {
   var input_file = './cloud_config_templates/kubernetes-cluster-etcd-node-template.yml';
+  var output_file = util.join_output_file_path('kubernetes-cluster-etcd-nodes', 'generated.yml');
 
-  return _(node_count).times(function (n) {
+  return cloud_config.process_template(input_file, output_file, function(data) {
-    var output_file = util.join_output_file_path('kubernetes-cluster-etcd-node-' + n, 'generated.yml');
+    data.coreos.units.push(etcd_initial_cluster_conf_self(conf));
-
+    return data;
-    return cloud_config.process_template(input_file, output_file, function(data) {
-      return data;
-    });
   });
 };
 
@@ -31,8 +67,10 @@ exports.create_node_cloud_config = function (node_count, conf) {
       bridge_address_cidr: util.ipv4([10, 2, n, 1], 24),
     });
   };
+
   return cloud_config.process_template(input_file, output_file, function(data) {
     data.write_files = data.write_files.concat(_(node_count).times(make_node_config));
+    data.coreos.units.push(etcd_initial_cluster_conf_kube(conf));
     return data;
   });
 };