centos7安裝etcd

           通過上一篇博客（剖析etcd）已經對etcd有初步了解了，那麼就動手實踐安裝吧。本次系統環境了是在vmware下安裝了2個centos7系統（使用NAT方式，ip分別是192.168.174.128和192.168.174.129）。登錄用戶用root。

1.下載安裝

     https://github.com/coreos/etcd/releases  在這網頁，你可以看到有多個版本共選擇，也有不同OS下的下載方式例子，點擊進去看就OK了。
    使用curl -L下載curl -L https://github.com/coreos/etcd/releases/download/v3.1.0-alpha.1/etcd-v3.1.0-alpha.1-linux-amd64.tar.gz -o etcd-v3.1.0-alpha.1-linux-amd64.tar.gz   3.1.0是目前最新版本。

   解壓後，會看到etcd,etcdctl,將它們複制到/usr/local/bin或/usr/bin下

運行 etcd，將默認組建一個兩個節點的集群。數據庫服務端默認監聽在 2379 和 4001 端口，etcd 實例監 聽在 2380 和 7001 端口。顯示類似如下的信息：

   檢查etcd是否正常了，那就通過etcdctl操作一些命令。注意操作前請先看看READ-etcdctl.ME和READv2-etcdctl.ME文件，其中READ-etcdctl.ME開頭有句話。

    就是說，要在環境變量中設置ETCDCTL_API=3.否則使用etcdctl時會報錯（我一開始就沒注意）

  通過etcdctl help查看有哪些命令

[root@localhost etcd-v3.1.0-alpha.1-linux-amd64]# etcdctl help
NAME:
 etcdctl - A simple command line client for etcd3.
USAGE:
 etcdctl
VERSION:
 3.1.0-alpha.1
COMMANDS:
 get Gets the key or a range of keys
 put Puts the given key into the store
 del Removes the specified key or range of keys [key, range_end)
 txn Txn processes all the requests in one transaction
 compaction Compacts the event history in etcd
 alarm disarm Disarms all alarms
 alarm list Lists all alarms
 defrag Defragments the storage of the etcd members with given endpoints
 endpoint health Checks the healthiness of endpoints specified in `endpoints` flag
 endpoint status Prints out the status of endpoints specified in `endpoints` flag
 watch Watches events stream on keys or prefixes
 version Prints the version of etcdctl
 lease grant Creates leases
 lease revoke Revokes leases
 lease timetolive Get lease information
 lease keep-alive Keeps leases alive (renew)
 member add Adds a member into the cluster
 member remove Removes a member from the cluster
 member update Updates a member in the cluster
 member list Lists all members in the cluster
 snapshot save Stores an etcd node backend snapshot to a given file
 snapshot restore Restores an etcd member snapshot to an etcd directory
 snapshot status Gets backend snapshot status of a given file
 make-mirror Makes a mirror at the destination etcd cluster
 migrate Migrates keys in a v2 store to a mvcc store
 lock Acquires a named lock
 elect Observes and participates in leader election
 auth enable Enables authentication
 auth disable Disables authentication
 user add Adds a new user
 user delete Deletes a user
 user get Gets detailed information of a user
 user list Lists all users
 user passwd Changes password of user
 user grant-role Grants a role to a user
 user revoke-role Revokes a role from a user
 role add Adds a new role
 role delete Deletes a role
 role get Gets detailed information of a role




 role list Lists all roles
 role grant-permission Grants a key to a role
 role revoke-permission Revokes a key from a role
 help Help about any command
OPTIONS:
 cacert="" verify certificates of TLS-enabled secure servers using this CA bundle
 cert="" identify secure client using this TLS certificate file
 command-timeout=5s timeout for short running command (excluding dial timeout)
 dial-timeout=2s dial timeout for client connections
 endpoints=[127.0.0.1:2379] gRPC endpoints
 hex[=false] print byte strings as hex encoded strings
 insecure-skip-tls-verify[=false] skip server certificate verification
 insecure-transport[=true] disable transport security for client connections
 key="" identify secure client using this TLS key file
 user="" username[:password] for authentication (prompt if password is not supplied)
 -w, write-out="simple" set the output format (json, proto, simple, table)
[root@localhost etcd-v3.1.0-alpha.1-linux-amd64]# 

   
通過查看.md文件，裏面有非常多關於etcdctl相關的操作命令，並且舉例子說明，內容很多，這裏就不貼了.測試

[root@localhost etcd-v3.1.0-alpha.1-linux-amd64]# etcdctl put testkey 'hello word'
OK
[root@localhost etcd-v3.1.0-alpha.1-linux-amd64]# etcdctl get testkey
testkey
hello word

說明安裝成功了。
再另一台機器也是如此安裝。

2.集群配置

   上面的安裝都是在單台服務上的。下面說說集群的安裝。
   轉載自http://blog.csdn.net/u010511236/article/details/52386229