Etcd

1. Etcd 是一個分散式鍵值儲存系統，用於分散式密鑰鎖定。OpenStack 可以使用 Etcd 為集群之間提供可靠的共享數據服務。

   [root@ip112 ~]# yum install etcd
   

2. 編輯 /etc/etcd/etcd.conf 設定檔，設定以下變數，163.17.10.112 為控制節點的IP。

   [root@ip112 ~]# vim /etc/etcd/etcd.conf 
   [root@ip112 ~]# egrep '(#\[[MC]|^ETCD)' /etc/etcd/etcd.conf
   #[Member]
   ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
   ETCD_LISTEN_PEER_URLS="http://163.17.10.112:2380"
   ETCD_LISTEN_CLIENT_URLS="http://163.17.10.112:2379"
   ETCD_NAME="controller"
   #[Clustering]
   ETCD_INITIAL_ADVERTISE_PEER_URLS="http://163.17.10.112:2380"
   ETCD_ADVERTISE_CLIENT_URLS="http://163.17.10.112:2379"
   ETCD_INITIAL_CLUSTER="default=http://163.17.10.112:2380"
   ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster-01"
   ETCD_INITIAL_CLUSTER_STATE="new"
   

3. 啟動 etcd 服務，並設定開機啟動。

   [root@ip112 ~]# systemctl enable etcd.service
   [root@ip112 ~]# systemctl start etcd.service
   [root@ip112 ~]# systemctl status etcd.service
   ● etcd.service - Etcd Server
      Loaded: loaded (/usr/lib/systemd/system/etcd.service; enabled; vendor preset: disabled)
      Active: active (running) since Wed 2018-05-23 19:23:23 CST; 19s ago
    Main PID: 15849 (etcd)
      CGroup: /system.slice/etcd.service
              └─15849 /usr/bin/etcd --name=controller --data-dir=/var/lib/etcd/default.etcd --listen-client-url...