============ Redis 叢集 ============

1、說明：至少6臺，3主3從，本例中【7001[master1]、7002[master2]、7003[master3]、7004[slave1]、7005[slave2]、7006[slave3]】，搭建在同臺機器上

2、搭建步驟：

  1)、遞迴建立資料夾：【mkdir -p /usr/local/redis-cluster】
  
  2)、在/usr/local/redis-cluster目錄下建立6個資料夾：【mkdir 7001、mkdir 7002、mkdir 7003、mkdir 7004、mkdir 7005、mkdir 7006】
  
  3)、將redis.conf配置檔案分別copy到700*下，進行修改各個檔案的內容
    (1)、後臺啟動：【daemonize yes】
	(2)、埠號：【port 700*】
	(3)、綁定當前機器IP：【bind 192.168.56.101】
	(4)、指定資料檔案存放路徑：【dir /usr/local/redis-cluster/700*/】,不修改擔心丟失資料
	(5)、持久方式開啟快照：【appendonly yes】，生產上用【appendfsync always】
	(6)、啟動叢集模式：【cluster-enabled yes】
	(7)、節點配置檔案與埠號對應：【cluster-config-file nodes700*.conf】，讓每個節點相互知道對方的存在
	(8)、設定超時時間：【cluster-node-timeout 15000】
	
  4.1)、叢集用到ruby命令，因此安裝ruby，方式一
    (1)、【yum install ruby】
	(2)、【yum install rubygems】
	(3)、【gem install redis】,安裝redis和ruby介面,redis版本要2.2.x以上
	
  4.2)、叢集用到ruby命令，因此安裝ruby，方式二
    (1)、安裝rvm
	  1]、切換到root目錄下：【cd /】
	  2]、【gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB】
      3]、【curl -sSL https://get.rvm.io | bash -s stable】
      4]、【source /etc/profile.d/rvm.sh】
      5]、檢視是否安裝成功：【rvm -v】
	(2)、安裝ruby：【rvm install 2.4.2】
	(3)、【gem install redis】,安裝redis和ruby介面,redis版本要2.2.x以上
	
  5)、逐個啟動6個redis例項：【/usr/local/redis/bin/redis-server /usr/local/redis-cluster/700*/redis.conf】
  
  6)、檢查是否啟動成功：【ps -ef | grep redis】,檢視是否已存在對應程序
  
  7)、在redis的安裝目錄下，執行叢集指令碼，啟動叢集：【/usr/local/redis-3.0.7/src/redis-trib.rb create --replicas 1 192.168.56.101:7001 192.168.56.101:7002 192.168.56.101:7003 192.168.56.101:7004 192.168.56.101:7005 192.168.56.101:7006】，下次重啟機器不需要此操作
  注：其中的 1 為主節點與從節點的比值(1 = 主節點數量/從節點數量),主節點排完，接著排從節點，一一對應，例如，7001為master1，則7004為slave1
  
  8)、連線任意客戶端：【/usr/local/redis/bin/redis-cli -c -h 192.168.56.101 -p 7001】(./redis-cli -c -h -p),[-c 表示叢集模式，-h指定ip,-p指定埠號]
  
  9)、驗證叢集是否搭建成功：檢視叢集資訊【cluster info】，檢視叢集節點【cluster nodes】
  
  10)、關閉叢集：【/usr/local/redis/bin/redis-cli -c -h 192.168.56.101 -p 700* shutdown】，需要逐個關閉
  
  11)、注意：出現叢集無法啟動時，刪除臨時的資料檔案，再次重新啟動每個redis服務，然後重新構建叢集環境
  
  12)、啟動成功時返回的資訊：
[
 
[email protected] src]# /usr/local/redis-3.0.7/src/redis-trib.rb create --replicas 1 192.168.56.101:7001 192.168.56.101:7002 192.168.56.101:7003 192.168.56.101:7004 192.168.56.101:7005 192.168.56.101:7006
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.56.101:7001
192.168.56.101:7002
192.168.56.101:7003
Adding replica 192.168.56.101:7004 to 192.168.56.101:7001
Adding replica 192.168.56.101:7005 to 192.168.56.101:7002
Adding replica 192.168.56.101:7006 to 192.168.56.101:7003
M: dbad2a94ae14569188a0ea2a0a645d8fcd023486 192.168.56.101:7001
   slots:0-5460 (5461 slots) master
M: f668dbe36e0af1aca1242659b8f4ad561257f9d8 192.168.56.101:7002
   slots:5461-10922 (5462 slots) master
M: b7e323d03ec1eab723c563125a19606039b6da8f 192.168.56.101:7003
   slots:10923-16383 (5461 slots) master
S: 242f06fa14821f7d5ff698e7459b8138b96b0161 192.168.56.101:7004
   replicates dbad2a94ae14569188a0ea2a0a645d8fcd023486
S: ba721da0c5da588b834fe4525e0c1860aaa44bb0 192.168.56.101:7005
   replicates f668dbe36e0af1aca1242659b8f4ad561257f9d8
S: d5082dbe9ab6c70e2592864dd814bb3ac72920ac 192.168.56.101:7006
   replicates b7e323d03ec1eab723c563125a19606039b6da8f
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join....
>>> Performing Cluster Check (using node 192.168.56.101:7001)
M: dbad2a94ae14569188a0ea2a0a645d8fcd023486 192.168.56.101:7001
   slots:0-5460 (5461 slots) master
M: f668dbe36e0af1aca1242659b8f4ad561257f9d8 192.168.56.101:7002
   slots:5461-10922 (5462 slots) master
M: b7e323d03ec1eab723c563125a19606039b6da8f 192.168.56.101:7003
   slots:10923-16383 (5461 slots) master
M: 242f06fa14821f7d5ff698e7459b8138b96b0161 192.168.56.101:7004
   slots: (0 slots) master
   replicates dbad2a94ae14569188a0ea2a0a645d8fcd023486
M: ba721da0c5da588b834fe4525e0c1860aaa44bb0 192.168.56.101:7005
   slots: (0 slots) master
   replicates f668dbe36e0af1aca1242659b8f4ad561257f9d8
M: d5082dbe9ab6c70e2592864dd814bb3ac72920ac 192.168.56.101:7006
   slots: (0 slots) master
   replicates b7e323d03ec1eab723c563125a19606039b6da8f
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.