Redis Cluster集群
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Redis Cluster集群
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一、redis-cluster設計
Redis集群搭建的方式有多種，例如使用zookeeper等，但從redis 3.0之后版本支持redis-cluster集群，Redis-Cluster采用無中心結構，每個節點保存數據和整個集群狀態,每個節點都和其他所有 節點連接。其redis-cluster架構圖如下：
其結構特點：
? ? ?1、所有的redis節點彼此互聯(PING-PONG機制),內部使用二進制協議優化傳輸速度和帶寬。
? ? ?2、節點的fail是通過集群中超過半數的節點檢測失效時才生效。
? ? ?3、客戶端與redis節點直連,不需要中間proxy層.客戶端不需要連接集群所有節點,連接集群中任何一個可用節點即可。
? ? ?4、redis-cluster把所有的物理節點映射到[0-16383]slot上（不一定是平均分配）,cluster 負責維護node<->slot<->value。
? ? ?5、Redis集群預分好16384個桶，當需要在 Redis 集群中放置一個 key-value 時，根據 CRC16(key) mod 16384的值，決定將一個key放到哪個桶中。
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? ?1、redis cluster節點分配
?
? ?現在我們是三個主節點分別是：A, B, C 三個節點，它們可以是一臺機器上的三個端口，也可以是三臺不同的服務器。那么，采用哈希槽 (hash slot)的方式來分配16384個slot 的話，它們三個節點分別承擔的slot 區間是：
? ? ? 節點A覆蓋0－5460;
? ? ? 節點B覆蓋5461－10922;
? ? ? 節點C覆蓋10923－16383.
? ??
? ? ?獲取數據：
? ? ? 如果存入一個值，按照redis cluster哈希槽的算法：?CRC16('key')%16384 = 6782。 那么就會把這個key 的存儲分配到 B 上了。同樣，當我連接(A,B,C)任何一個節點想獲取'key'這個key時，也會這樣的算法，然后內部跳轉到B節點上獲取數據?
? ??
? ? ?新增一個主節點：
? ? ??新增一個節點D，redis cluster的這種做法是從各個節點的前面各拿取一部分slot到D上，我會在接下來的實踐中實驗。大致就會變成這樣：
??
? ? 節點A覆蓋1365-5460
? ? 節點B覆蓋6827-10922
? ? 節點C覆蓋12288-16383
? ? 節點D覆蓋0-1364,5461-6826,10923-12287
? ? ?同樣刪除一個節點也是類似，移動完成后就可以刪除這個節點了。
?
??? ?2、Redis Cluster主從模式
? ? ? ? ? redis cluster 為了保證數據的高可用性，加入了主從模式，一個主節點對應一個或多個從節點，主節點提供數據存取，從節點則是從主節點拉取數據備份，當這個主節點掛掉后，就會有這個從節點選取一個來充當主節點，從而保證集群不會掛掉。
? ? ? 上面那個例子里, 集群有ABC三個主節點, 如果這3個節點都沒有加入從節點，如果B掛掉了，我們就無法訪問整個集群了。A和C的slot也無法訪問。
? ? ?所以我們在集群建立的時候，一定要為每個主節點都添加了從節點, 比如像這樣, 集群包含主節點A、B、C, 以及從節點A1、B1、C1, 那么即使B掛掉系統也可以繼續正確工作。
? ? ?B1節點替代了B節點，所以Redis集群將會選擇B1節點作為新的主節點，集群將會繼續正確地提供服務。 當B重新開啟后，它就會變成B1的從節點。
? ? 不過需要注意，如果節點B和B1同時掛了，Redis集群就無法繼續正確地提供服務了。
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二、redis集群的搭建
? ? 集群中至少應該有奇數個節點，所以至少有三個節點，每個節點至少有一個備份節點，所以下面使用6節點（主節點、備份節點由redis-cluster集群確定）。
? ?
? ? ?下面使用redis-3.2.0安裝，下載地址? ?
? ? ?1、安裝redis節點指定端口
? ? ? ? ?解壓redis壓縮包，編譯安裝
? ? ? ??
[root@localhost?redis-3.2.0]#?tar?xzf?redis-3.2.0.tar.gz?? [root@localhost?redis-3.2.0]#?cd?redis-3.2.0?? [root@localhost?redis-3.2.0]#?make?? [root@localhost?redis01]#?make?install?PREFIX=/usr/andy/redis-cluster???
?在redis-cluster下?修改bin文件夾為redis01,復制redis.conf配置文件
? ? ? ?
? ? ?配置redis的配置文件redis.conf
?
? ? ? ? ?daemonize yes #后臺啟動
? ? ? ??port 7001 #修改端口號，從7001到7006
? ? ? ??cluster-enabled yes #開啟cluster，去掉注釋
? ? ? ? cluster-config-file nodes.conf
? ? ? ??cluster-node-timeout 15000
? ? ? ??appendonly yes
?
?
? ? ? ? 復制六份，修改對應的端口號
? ? ? ??
?
??? ?2、安裝redis-trib所需的 ruby腳本
? ? ? ? ? 復制redis解壓文件src下的redis-trib.rb文件到redis-cluster目錄
? ? ? ? ??
[root@localhost?redis-cluster]#?cp?/usr/andy/redis/redis-3.2.0/src/redis-trib.rb?./???
?
? ? ??? ?安裝ruby環境：
? ? ??
[root@localhost?redis-cluster]#?yum?install?ruby?? [root@localhost?redis-cluster]#?yum?install?rubygems???
? ? ? ??安裝redis-trib.rb運行依賴的ruby的包redis-3.2.2.gem，下載
? ? ? ??
[root@localhost?redis-cluster]#?gem?install?redis-3.2.2.gem???
? ? ?3、啟動所有的redis節點
? ? ? ?可以寫一個命令腳本start-all.sh
? ? ? ?
?
cd?redis01?? ./redis-server?redis.conf?? cd?..?? cd?redis02?? ./redis-server?redis.conf?? cd?..?? cd?redis03?? ./redis-server?redis.conf?? cd?..?? cd?redis04?? ./redis-server?redis.conf?? cd?..?? cd?redis05?? ./redis-server?redis.conf?? cd?..?? cd?redis06?? ./redis-server?redis.conf?? cd?..???
? ? ?設置權限啟動
? ? ?
[root@localhost?redis-cluster]#?chmod?777?start-all.sh??? [root@localhost?redis-cluster]#?./start-all.sh????
? ? ? ?查看redis進程啟動狀態
[root@localhost?redis-cluster]#?ps?-ef?|?grep?redis??root???????4547??????1??0?23:12??????????00:00:00?./redis-server?127.0.0.1:7001?[cluster]?? root???????4551??????1??0?23:12??????????00:00:00?./redis-server?127.0.0.1:7002?[cluster]?? root???????4555??????1??0?23:12??????????00:00:00?./redis-server?127.0.0.1:7003?[cluster]?? root???????4559??????1??0?23:12??????????00:00:00?./redis-server?127.0.0.1:7004?[cluster]?? root???????4563??????1??0?23:12??????????00:00:00?./redis-server?127.0.0.1:7005?[cluster]?? root???????4567??????1??0?23:12??????????00:00:00?./redis-server?127.0.0.1:7006?[cluster]?? root???????4840???4421??0?23:26?pts/1????00:00:00?grep?--color=auto?redis??? ?
? 可以看到redis的6個節點已經啟動成功
? ?
? ? 殺死全部的節點：
?
[root@localhost?redis-cluster]#?pkill?-9?redis???
? ? ?4、使用redis-trib.rb創建集群
?
?
./redis-trib.rb?create?--replicas?1?127.0.0.1:7001?127.0.0.1:7002?127.0.0.1:7003?127.0.0.1:7004?127.0.0.1:7005?127.0.0.1:7006???
? ? ???使用create命令 --replicas 1 參數表示為每個主節點創建一個從節點，其他參數是實例的地址集合。
? ? ??
[root@localhost?redis-cluster]#?./redis-trib.rb?create?--replicas?1?127.0.0.1:7001?127.0.0.1:7002?127.0.0.1:7003?127.0.0.1:7004?127.0.0.1:7005?127.0.0.1:7006?? >>>?Creating?cluster?? >>>?Performing?hash?slots?allocation?on?6?nodes...?? Using?3?masters:?? 127.0.0.1:7001?? 127.0.0.1:7002?? 127.0.0.1:7003?? Adding?replica?127.0.0.1:7004?to?127.0.0.1:7001?? Adding?replica?127.0.0.1:7005?to?127.0.0.1:7002?? Adding?replica?127.0.0.1:7006?to?127.0.0.1:7003?? M:?dfd510594da614469a93a0a70767ec9145aefb1a?127.0.0.1:7001??slots:0-5460?(5461?slots)?master?? M:?e02eac35110bbf44c61ff90175e04d55cca097ff?127.0.0.1:7002??slots:5461-10922?(5462?slots)?master?? M:?4385809e6f4952ecb122dbfedbee29109d6bb234?127.0.0.1:7003??slots:10923-16383?(5461?slots)?master?? S:?ec02c9ef3acee069e8849f143a492db18d4bb06c?127.0.0.1:7004??replicates?dfd510594da614469a93a0a70767ec9145aefb1a?? S:?83e5a8bb94fb5aaa892cd2f6216604e03e4a6c75?127.0.0.1:7005??replicates?e02eac35110bbf44c61ff90175e04d55cca097ff?? S:?10c097c429ca24f8720986c6b66f0688bfb901ee?127.0.0.1:7006??replicates?4385809e6f4952ecb122dbfedbee29109d6bb234?? 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?127.0.0.1:7001)?? M:?dfd510594da614469a93a0a70767ec9145aefb1a?127.0.0.1:7001??slots:0-5460?(5461?slots)?master?? M:?e02eac35110bbf44c61ff90175e04d55cca097ff?127.0.0.1:7002??slots:5461-10922?(5462?slots)?master?? M:?4385809e6f4952ecb122dbfedbee29109d6bb234?127.0.0.1:7003??slots:10923-16383?(5461?slots)?master?? M:?ec02c9ef3acee069e8849f143a492db18d4bb06c?127.0.0.1:7004??slots:?(0?slots)?master??replicates?dfd510594da614469a93a0a70767ec9145aefb1a?? M:?83e5a8bb94fb5aaa892cd2f6216604e03e4a6c75?127.0.0.1:7005??slots:?(0?slots)?master??replicates?e02eac35110bbf44c61ff90175e04d55cca097ff?? M:?10c097c429ca24f8720986c6b66f0688bfb901ee?127.0.0.1:7006??slots:?(0?slots)?master??replicates?4385809e6f4952ecb122dbfedbee29109d6bb234?? [OK]?All?nodes?agree?about?slots?configuration.?? >>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.???
? ? ???上面顯示創建成功，有3個主節點，3個從節點，每個節點都是成功連接狀態。
?
? ? ? ?3個主節點[M]以及分配的哈希卡槽如下：
??M: dfd510594da614469a93a0a70767ec9145aefb1a 127.0.0.1:7001
? ???slots:0-5460 (5461 slots) master
??M: e02eac35110bbf44c61ff90175e04d55cca097ff 127.0.0.1:7002
? ? ?slots:5461-10922 (5462 slots) master
??M: 4385809e6f4952ecb122dbfedbee29109d6bb234 127.0.0.1:7003
? ???slots:10923-16383 (5461 slots) master
? ? ??
? ? ? ? ??3個從節點[S]以及附屬的主節點如下：
? ? ? ? ??S: ec02c9ef3acee069e8849f143a492db18d4bb06c 127.0.0.1:7004
? ? ? ? ? ? ?replicates dfd510594da614469a93a0a70767ec9145aefb1a
? ? ? ? ? S: 83e5a8bb94fb5aaa892cd2f6216604e03e4a6c75 127.0.0.1:7005
? ? ? ? ? ? ?replicates e02eac35110bbf44c61ff90175e04d55cca097ff
? ? ? ? ? S: 10c097c429ca24f8720986c6b66f0688bfb901ee 127.0.0.1:7006
? ? ? ? ? ? ?replicates 4385809e6f4952ecb122dbfedbee29109d6bb234
?
? ? ? ??以上集群安裝成功了，如果安裝未成功報如下錯誤
? ? ? ?>>> Creating cluster
? ? ? ?[ERR] Sorry, can't connect to node??....
? ? ? ? ? 需要安裝最新的ruby源碼，下載
?
[root@localhost?redis-cluster]#?tar?-zxvf?ruby-2.3.1.tar.gz??? [root@localhost?redis-cluster]#?cd???? [root@localhost?redis-cluster]#?./configure?--prefix=/usr/local/ruby-2.3.1???? [root@localhost?redis-cluster]#?make?&&?make?install??????? [root@localhost?redis-cluster]#gem?install?redis????? ? ? ? ?還有一種情況是，在VMware做測試的時間（都在一臺服務器時），ip應該使用127.0.0.1，如果使用局域網ip，也會報節點創建失敗。
? ? ? ??
三、redis集群的測試
? ? ?1、測試存取值
? ? ? ? ?客戶端連接集群redis-cli需要帶上 -c ，redis-cli -c -p 端口號
[root@localhost?redis01]#?./redis-cli?-c?-p?7001?? 127.0.0.1:7001>?set?name?andy?? ->?Redirected?to?slot?[5798]?located?at?127.0.0.1:7002?? OK?? 127.0.0.1:7002>?get?name?? "andy"?? 127.0.0.1:7002>????
? ? ? ? 根據redis-cluster的key值分配，name應該分配到節點7002[5461-10922]上，上面顯示redis cluster自動從7001跳轉到了7002節點。
? ? ? ?我們可以測試一下7006從節點獲取name值
[root@localhost?redis06]#?./redis-cli?-c?-p?7006?? 127.0.0.1:7006>?get?name?? ->?Redirected?to?slot?[5798]?located?at?127.0.0.1:7002?? "andy"?? 127.0.0.1:7002>???
?
? ? ? ? 7006位7003的從節點，從上面也是自動跳轉至7002獲取值，這也是redis cluster的特點，它是去中心化，每個節點都是對等的，連接哪個節點都可以獲取和設置數據。
?
?
四、集群節點選舉
? ? ? ? ?現在模擬將7002節點掛掉，按照redis-cluster原理會選舉會將 7002的從節點7005選舉為主節點。
?
[root@localhost?redis-cluster]#?ps?-ef?|?grep?redis?? root???????7950??????1??0?12:50??????????00:00:28?./redis-server?127.0.0.1:7001?[cluster]?? root???????7952??????1??0?12:50??????????00:00:29?./redis-server?127.0.0.1:7002?[cluster]?? root???????7956??????1??0?12:50??????????00:00:29?./redis-server?127.0.0.1:7003?[cluster]?? root???????7960??????1??0?12:50??????????00:00:29?./redis-server?127.0.0.1:7004?[cluster]?? root???????7964??????1??0?12:50??????????00:00:29?./redis-server?127.0.0.1:7005?[cluster]?? root???????7966??????1??0?12:50??????????00:00:29?./redis-server?127.0.0.1:7006?[cluster]?? root??????11346??10581??0?14:57?pts/2????00:00:00?grep?--color=auto?redis?? [root@localhost?redis-cluster]#?kill?7952??? ? ? ? 在查看集群中的7002節點
?
[root@localhost?redis-cluster]#??? [root@localhost?redis-cluster]#?./redis-trib.rb?check?127.0.0.1:7002?? [ERR]?Sorry,?can't?connect?to?node?127.0.0.1:7002?? [root@localhost?redis-cluster]#?./redis-trib.rb?check?127.0.0.1:7005?? >>>?Performing?Cluster?Check?(using?node?127.0.0.1:7005)?? M:?a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005??slots:5461-10922?(5462?slots)?master??0?additional?replica(s)?? S:?50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004??slots:?(0?slots)?slave??replicates?dd19221c404fb2fc4da37229de56bab755c76f2b?? M:?f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003??slots:10923-16383?(5461?slots)?master??1?additional?replica(s)?? M:?dd19221c404fb2fc4da37229de56bab755c76f2b?127.0.0.1:7001??slots:0-5460?(5461?slots)?master??1?additional?replica(s)?? S:?8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006??slots:?(0?slots)?slave??replicates?f9886c71e98a53270f7fda961e1c5f730382d48f?? [OK]?All?nodes?agree?about?slots?configuration.?? >>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.?? [root@localhost?redis-cluster]#???
? ? ? 可以看到集群連接不了7002節點，而7005有原來的S轉換為M節點，代替了原來的7002節點。我們可以獲取name值：
? ?從7001節點連入，自動跳轉到7005節點，并且獲取name值。
?
? ? 現在我們將7002節點恢復，看是否會自動加入集群中以及充當的M還是S節點。
[root@localhost?redis-cluster]#?cd?redis02?? [root@localhost?redis02]#?./redis-server?redis.conf??? [root@localhost?redis02]#????
? ? ?在check一下7002節點
[root@localhost?redis-cluster]#?./redis-trib.rb?check?127.0.0.1:7002?? >>>?Performing?Cluster?Check?(using?node?127.0.0.1:7002)?? S:?1f07d76585bfab35f91ec711ac53ab4bc00f2d3a?127.0.0.1:7002??slots:?(0?slots)?slave??replicates?a5db243087d8bd423b9285fa8513eddee9bb59a6?? M:?f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003??slots:10923-16383?(5461?slots)?master??1?additional?replica(s)?? M:?a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005??slots:5461-10922?(5462?slots)?master??1?additional?replica(s)?? S:?50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004??slots:?(0?slots)?slave??replicates?dd19221c404fb2fc4da37229de56bab755c76f2b?? S:?8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006??slots:?(0?slots)?slave??replicates?f9886c71e98a53270f7fda961e1c5f730382d48f?? M:?dd19221c404fb2fc4da37229de56bab755c76f2b?127.0.0.1:7001??slots:0-5460?(5461?slots)?master??1?additional?replica(s)?? [OK]?All?nodes?agree?about?slots?configuration.?? >>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.?? [root@localhost?redis-cluster]#????
? ? 可以看到7002節點變成了a5db243087d8bd423b9285fa8513eddee9bb59a6 7005的從節點。
?
五、集群節點添加
? ?節點新增包括新增主節點、從節點兩種情況。以下分別做一下測試：
? ? 1、新增主節點
? ? ? ?新增一個節點7007作為主節點修改配置文件
?
[root@localhost?redis-cluster]#?cp?-r??redis01?redis07?? [root@localhost?redis-cluster]#?cd?redis07/?? [root@localhost?redis07]#?sed?-i?"s/7001/7007/g"?./redis.conf????
? ? ? 啟動7007redis服務
?
[root@localhost?redis07]#?./redis-server?redis.conf??? [root@localhost?redis07]#?netstat?-anp?|?grep?7007?? tcp????????0??????0?127.0.0.1:17007?????????0.0.0.0:*???????????????LISTEN??????13441/./redis-serve??? tcp????????0??????0?127.0.0.1:7007??????????0.0.0.0:*???????????????LISTEN??????13441/./redis-serve??? [root@localhost?redis07]#???
? 上面可以看到，7007已經啟動，現在加入集群中。添加使用redis-trib.rb的add-node命令
?
./redis-trib.rb?add-node?127.0.0.1:7007?127.0.0.1:7002??
? ? add-node是加入集群節點，127.0.0.1:7007為要加入的節點，127.0.0.1:7002 表示加入的集群的一個節點，用來辨識是哪個集群，理論上那個集群的節點都可以。
? ? 執行以下add-node
?
[root@localhost?redis-cluster]#?./redis-trib.rb?add-node?127.0.0.1:7007?127.0.0.1:7002?? >>>?Adding?node?127.0.0.1:7007?to?cluster?127.0.0.1:7002?? >>>?Performing?Cluster?Check?(using?node?127.0.0.1:7002)?? S:?1f07d76585bfab35f91ec711ac53ab4bc00f2d3a?127.0.0.1:7002??slots:?(0?slots)?slave??replicates?a5db243087d8bd423b9285fa8513eddee9bb59a6?? M:?f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003??slots:10923-16383?(5461?slots)?master??1?additional?replica(s)?? M:?a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005??slots:5461-10922?(5462?slots)?master??1?additional?replica(s)?? S:?50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004??slots:?(0?slots)?slave??replicates?dd19221c404fb2fc4da37229de56bab755c76f2b?? S:?8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006??slots:?(0?slots)?slave??replicates?f9886c71e98a53270f7fda961e1c5f730382d48f?? M:?dd19221c404fb2fc4da37229de56bab755c76f2b?127.0.0.1:7001??slots:0-5460?(5461?slots)?master??1?additional?replica(s)?? [OK]?All?nodes?agree?about?slots?configuration.?? >>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.?? >>>?Send?CLUSTER?MEET?to?node?127.0.0.1:7007?to?make?it?join?the?cluster.?? [OK]?New?node?added?correctly.?? [root@localhost?redis-cluster]#????
? ???可以看到7007加入這個Cluster，并成為一個新的節點。
? ? ?可以check以下7007節點狀態
[root@localhost?redis-cluster]#?./redis-trib.rb?check?127.0.0.1:7007?? >>>?Performing?Cluster?Check?(using?node?127.0.0.1:7007)?? M:?ee3efb90e5ac0725f15238a64fc60a18a71205d7?127.0.0.1:7007??slots:?(0?slots)?master??0?additional?replica(s)?? S:?8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006??slots:?(0?slots)?slave??replicates?f9886c71e98a53270f7fda961e1c5f730382d48f?? M:?dd19221c404fb2fc4da37229de56bab755c76f2b?127.0.0.1:7001??slots:0-5460?(5461?slots)?master??1?additional?replica(s)?? M:?f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003??slots:10923-16383?(5461?slots)?master??1?additional?replica(s)?? S:?1f07d76585bfab35f91ec711ac53ab4bc00f2d3a?127.0.0.1:7002??slots:?(0?slots)?slave??replicates?a5db243087d8bd423b9285fa8513eddee9bb59a6?? M:?a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005??slots:5461-10922?(5462?slots)?master??1?additional?replica(s)?? S:?50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004??slots:?(0?slots)?slave??replicates?dd19221c404fb2fc4da37229de56bab755c76f2b?? [OK]?All?nodes?agree?about?slots?configuration.?? >>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.?? [root@localhost?redis-cluster]#????
??M: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007
? ?slots: (0 slots) master
? ?0 additional replica(s)
??上面信息可以看到有4個M節點，3個S節點，7007成為了M主節點，它沒有附屬的從節點，而且Cluster并未給7007分配哈希卡槽（0 slots）。
? ??
? ?可以從客戶端連接集群查看一下，集群節點的連接情況
?
[root@localhost?redis-cluster]#?cd?redis07/?? [root@localhost?redis07]#?./redis-cli?-c?-p?7007?? 127.0.0.1:7007>?cluster?nodes?? 8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006?slave?f9886c71e98a53270f7fda961e1c5f730382d48f?0?1462955393326?3?connected?? dd19221c404fb2fc4da37229de56bab755c76f2b?127.0.0.1:7001?master?-?0?1462955388247?1?connected?0-5460?? ee3efb90e5ac0725f15238a64fc60a18a71205d7?127.0.0.1:7007?myself,master?-?0?0?0?connected?? f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003?master?-?0?1462955390270?3?connected?10923-16383?? 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a?127.0.0.1:7002?slave?a5db243087d8bd423b9285fa8513eddee9bb59a6?0?1462955394334?7?connected?? a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005?master?-?0?1462955392309?7?connected?5461-10922?? 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004?slave?dd19221c404fb2fc4da37229de56bab755c76f2b?0?1462955389663?1?connected?? 127.0.0.1:7007>????
? ? ?redis-cluster在新增節點時并未分配卡槽，需要我們手動對集群進行重新分片遷移數據，需要重新分片命令 reshard
? ??
? ? ? ? ? ? ? redis-trib.rb reshard 127.0.0.1:7005
?
? ? ?這個命令是用來遷移slot節點的，后面的127.0.0.1:7005是表示是哪個集群，端口填［7000-7007］都可以，執行結果如下：
[root@localhost?redis-cluster]#?./redis-trib.rb?reshard?127.0.0.1:7005?? >>>?Performing?Cluster?Check?(using?node?127.0.0.1:7005)?? M:?a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005??slots:5461-10922?(5462?slots)?master??1?additional?replica(s)?? S:?50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004??slots:?(0?slots)?slave??replicates?dd19221c404fb2fc4da37229de56bab755c76f2b?? M:?f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003??slots:10923-16383?(5461?slots)?master??1?additional?replica(s)?? S:?1f07d76585bfab35f91ec711ac53ab4bc00f2d3a?127.0.0.1:7002??slots:?(0?slots)?slave??replicates?a5db243087d8bd423b9285fa8513eddee9bb59a6?? M:?ee3efb90e5ac0725f15238a64fc60a18a71205d7?127.0.0.1:7007??slots:?(0?slots)?master??0?additional?replica(s)?? M:?dd19221c404fb2fc4da37229de56bab755c76f2b?127.0.0.1:7001??slots:0-5460?(5461?slots)?master??1?additional?replica(s)?? S:?8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006??slots:?(0?slots)?slave??replicates?f9886c71e98a53270f7fda961e1c5f730382d48f?? [OK]?All?nodes?agree?about?slots?configuration.?? >>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.?? How?many?slots?do?you?want?to?move?(from?1?to?16384)?????
? ? ? 它提示我們需要遷移多少slot到7007上，我們平分16384個哈希槽給4個節點：16384/4 = 4096，我們需要移動4096個槽點到7007上。
?
[OK]?All?16384?slots?covered.?? How?many?slots?do?you?want?to?move?(from?1?to?16384)??4096?? What?is?the?receiving?node?ID????? ? ?需要輸入7007的節點id，ee3efb90e5ac0725f15238a64fc60a18a71205d7
?
Please?enter?all?the?source?node?IDs.??Type?'all'?to?use?all?the?nodes?as?source?nodes?for?the?hash?slots.??Type?'done'?once?you?entered?all?the?source?nodes?IDs.?? Source?node?#1:???
? ? ??redis-trib 會向你詢問重新分片的源節點（source node），即，要從特點的哪個節點中取出 4096 個哈希槽，還是從全部節點提取4096個哈希槽， 并將這些槽移動到7007節點上面。
? ? ?如果我們不打算從特定的節點上取出指定數量的哈希槽，那么可以向redis-trib輸入 all，這樣的話， 集群中的所有主節點都會成為源節點，redis-trib從各個源節點中各取出一部分哈希槽，湊夠4096個，然后移動到7007節點上：
?
Source?node?#1:all??? ? 然后開始從別的主節點遷移哈希槽，并且確認。
?
????
Moving?slot?1343?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1344?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1345?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1346?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1347?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1348?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1349?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1350?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1351?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1352?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1353?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1354?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1355?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1356?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1357?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1358?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1359?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1360?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1361?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1362?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1363?from?dd19221c404fb2fc4da37229de56bab755c76f2b??Moving?slot?1364?from?dd19221c404fb2fc4da37229de56bab755c76f2b?? Do?you?want?to?proceed?with?the?proposed?reshard?plan?(yes/no)??yes??
? ? ?確認之后，redis-trib就開始執行分片操作，將哈希槽一個一個從源主節點移動到7007目標主節點。
? ? ?重新分片結束后我們可以check以下節點的分配情況。
?
[root@localhost?redis-cluster]#?./redis-trib.rb?check?127.0.0.1:7001?? >>>?Performing?Cluster?Check?(using?node?127.0.0.1:7001)?? M:?dd19221c404fb2fc4da37229de56bab755c76f2b?127.0.0.1:7001??slots:1365-5460?(4096?slots)?master??1?additional?replica(s)?? M:?ee3efb90e5ac0725f15238a64fc60a18a71205d7?127.0.0.1:7007??slots:0-1364,5461-6826,10923-12287?(4096?slots)?master??0?additional?replica(s)?? M:?a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005??slots:6827-10922?(4096?slots)?master??1?additional?replica(s)?? S:?8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006??slots:?(0?slots)?slave??replicates?f9886c71e98a53270f7fda961e1c5f730382d48f?? M:?f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003??slots:12288-16383?(4096?slots)?master??1?additional?replica(s)?? S:?1f07d76585bfab35f91ec711ac53ab4bc00f2d3a?127.0.0.1:7002??slots:?(0?slots)?slave??replicates?a5db243087d8bd423b9285fa8513eddee9bb59a6?? S:?50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004??slots:?(0?slots)?slave??replicates?dd19221c404fb2fc4da37229de56bab755c76f2b?? [OK]?All?nodes?agree?about?slots?configuration.?? >>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.?? [root@localhost?redis-cluster]#????
? ?slots:0-1364,5461-6826,10923-12287 (4096 slots) master
? ?可以看到7007節點分片的哈希槽片不是連續的，間隔的移動。
[root@localhost?redis-cluster]#?cd?redis07/?? [root@localhost?redis07]#?./redis-cli?-c?7007?? Could?not?connect?to?Redis?at?127.0.0.1:6379:?Connection?refused?? [root@localhost?redis07]#?./redis-cli?-c?-p?7007?? 127.0.0.1:7007>?keys?*?? 1)?"name"?? 2)?"age"?? 127.0.0.1:7007>??? 127.0.0.1:7007>???? ? 可以看到將7001的age[741]和name[5798]移動到7007節點上，
? ? 主節點7007添加成功。
?
? ? 2、新增從節點
? ? ? ?新增一個節點7008節點，使用add-node --slave命令。
?
[root@localhost?redis-cluster]#?cp?-r?redis01/?redis08?? [root@localhost?redis-cluster]#?cd?redis08/?? [root@localhost?redis08]#?sed?-i?"s/7001/7008/g"?./redis.conf?? [root@localhost?redis08]#?./redis-server?redis.conf???
? ?redis-trib增加從節點的命令為：
?
./redis-trib.rb?add-node?--slave?--master-id?$[nodeid]?127.0.0.1:7008?127.0.0.1:7000???
? ? nodeid為要加到master主節點的node id，127.0.0.1:7008為新增的從節點，127.0.0.1:7000為集群的一個節點（集群的任意節點都行），用來辨識是哪個集群；如果沒有給定那個主節點--master-id的話，redis-trib將會將新增的從節點隨機到從節點較少的主節點上。
?
? ? 現在我們添加一下7008，看是否會自動加到沒有從節點的7007主節點上。
?
[root@localhost?redis-cluster]#?./redis-trib.rb?add-node?--slave?127.0.0.1:7008?127.0.0.1:7001>>>?Adding?node?127.0.0.1:7008?to?cluster?127.0.0.1:7001?? >>>?Performing?Cluster?Check?(using?node?127.0.0.1:7001)?? M:?dd19221c404fb2fc4da37229de56bab755c76f2b?127.0.0.1:7001??slots:1365-5460?(4096?slots)?master??1?additional?replica(s)?? M:?ee3efb90e5ac0725f15238a64fc60a18a71205d7?127.0.0.1:7007??slots:0-1364,5461-6826,10923-12287?(4096?slots)?master??0?additional?replica(s)?? M:?a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005??slots:6827-10922?(4096?slots)?master??1?additional?replica(s)?? S:?8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006??slots:?(0?slots)?slave??replicates?f9886c71e98a53270f7fda961e1c5f730382d48f?? M:?f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003??slots:12288-16383?(4096?slots)?master??1?additional?replica(s)?? S:?1f07d76585bfab35f91ec711ac53ab4bc00f2d3a?127.0.0.1:7002??slots:?(0?slots)?slave??replicates?a5db243087d8bd423b9285fa8513eddee9bb59a6?? S:?50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004??slots:?(0?slots)?slave??replicates?dd19221c404fb2fc4da37229de56bab755c76f2b?? [OK]?All?nodes?agree?about?slots?configuration.?? >>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.?? Automatically?selected?master?127.0.0.1:7007?? >>>?Send?CLUSTER?MEET?to?node?127.0.0.1:7008?to?make?it?join?the?cluster.?? Waiting?for?the?cluster?to?join.?? >>>?Configure?node?as?replica?of?127.0.0.1:7007.?? [OK]?New?node?added?correctly.?? [root@localhost?redis-cluster]#???
? ? ?可以看到自動選擇了127.0.0.1:7007為master主節點，并且添加成功。
? ? ?可以check一下7008：
?
[root@localhost?redis-cluster]#?./redis-trib.rb?check?127.0.0.1:7008?? >>>?Performing?Cluster?Check?(using?node?127.0.0.1:7008)?? S:?2ab1b061c36f30ae35604e9a171ae3afdc3c87e5?127.0.0.1:7008??slots:?(0?slots)?slave??replicates?ee3efb90e5ac0725f15238a64fc60a18a71205d7?? M:?a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005??slots:6827-10922?(4096?slots)?master??1?additional?replica(s)?? M:?dd19221c404fb2fc4da37229de56bab755c76f2b?127.0.0.1:7001??slots:1365-5460?(4096?slots)?master??1?additional?replica(s)?? S:?8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006??slots:?(0?slots)?slave??replicates?f9886c71e98a53270f7fda961e1c5f730382d48f?? M:?ee3efb90e5ac0725f15238a64fc60a18a71205d7?127.0.0.1:7007??slots:0-1364,5461-6826,10923-12287?(4096?slots)?master??1?additional?replica(s)?? S:?50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004??slots:?(0?slots)?slave??replicates?dd19221c404fb2fc4da37229de56bab755c76f2b?? M:?f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003??slots:12288-16383?(4096?slots)?master??1?additional?replica(s)?? S:?1f07d76585bfab35f91ec711ac53ab4bc00f2d3a?127.0.0.1:7002??slots:?(0?slots)?slave??replicates?a5db243087d8bd423b9285fa8513eddee9bb59a6?? [OK]?All?nodes?agree?about?slots?configuration.?? >>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.?? [root@localhost?redis-cluster]#???? ? ? ?可以看到7008作為了7007的從節點。
? ? ? ??
? ? ? ?再測試一下指定主節點添加從節點，給7007增加7009從節點。
?
[root@localhost?redis-cluster]#?cp?-r?redis01/?redis09?? [root@localhost?redis-cluster]#?cd?redis09?? [root@localhost?redis09]#?sed?-i?"s/7001/7009/g"?./redis.conf?? [root@localhost?redis09]#?./redis-server?redis.conf????
? ? ? ?添加7007主節點上
?
?
? ? ?顯示從節點7009節點添加到7007主節點，可以看一下7007的從節點，如下：
?
[root@localhost?redis-cluster]#?cd?./redis07?? [root@localhost?redis07]#?./redis-cli?-c?-p?7007?cluster?nodes?|?grep?ee3efb90e5ac0725f15238a64fc60a18a71205d7??? 1f51443ede952b98724fea2a12f61fe710ab6cb1?127.0.0.1:7009?slave?ee3efb90e5ac0725f15238a64fc60a18a71205d7?0?1462962710266?8?connected?? ee3efb90e5ac0725f15238a64fc60a18a71205d7?127.0.0.1:7007?myself,master?-?0?0?8?connected?0-1364?5461-6826?10923-12287?? 2ab1b061c36f30ae35604e9a171ae3afdc3c87e5?127.0.0.1:7008?slave?ee3efb90e5ac0725f15238a64fc60a18a71205d7?0?1462962711607?8?connected?? [root@localhost?redis07]#???
? ? ?maser 7007有2個slave 7008,7009。
?
? ? ?我們測試一下7007節點掛掉，看7008和7009那個成為主節點。
?
[root@localhost?redis-cluster]#?ps?-ef?|?grep?redis?? root???????7950??????1??0?12:50??????????00:02:05?./redis-server?127.0.0.1:7001?[cluster]?? root???????7956??????1??0?12:50??????????00:02:11?./redis-server?127.0.0.1:7003?[cluster]?? root???????7960??????1??0?12:50??????????00:01:47?./redis-server?127.0.0.1:7004?[cluster]?? root???????7964??????1??0?12:50??????????00:02:07?./redis-server?127.0.0.1:7005?[cluster]?? root???????7966??????1??0?12:50??????????00:01:46?./redis-server?127.0.0.1:7006?[cluster]?? root??????12070??????1??0?15:14??????????00:01:08?./redis-server?127.0.0.1:7002?[cluster]?? root??????13441??????1??0?16:09??????????00:01:25?./redis-server?127.0.0.1:7007?[cluster]?? root??????15939??????1??0?17:41??????????00:00:20?./redis-server?127.0.0.1:7008?[cluster]?? root??????16623??????1??0?18:07??????????00:00:10?./redis-server?127.0.0.1:7009?[cluster]?? root??????17295??10581??0?18:37?pts/2????00:00:00?grep?--color=auto?redis?? [root@localhost?redis-cluster]#?kill?-9?13441?? [root@localhost?redis-cluster]#?cd?./redis08?? [root@localhost?redis08]#?./redis-cli?-c?-p?7008?? 127.0.0.1:7008>?get?name?? ->?Redirected?to?slot?[5798]?located?at?127.0.0.1:7009?? "andy"?? 127.0.0.1:7009>?cluster?nodes?? ee3efb90e5ac0725f15238a64fc60a18a71205d7?127.0.0.1:7007?master,fail?-?1462963082317?1462963080194?8?disconnected?? 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004?slave?dd19221c404fb2fc4da37229de56bab755c76f2b?0?1462963170968?1?connected?? f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003?master?-?0?1462963168525?3?connected?12288-16383?? dd19221c404fb2fc4da37229de56bab755c76f2b?127.0.0.1:7001?master?-?0?1462963164466?1?connected?1365-5460?? 2ab1b061c36f30ae35604e9a171ae3afdc3c87e5?127.0.0.1:7008?slave?1f51443ede952b98724fea2a12f61fe710ab6cb1?0?1462963167508?9?connected?? 1f51443ede952b98724fea2a12f61fe710ab6cb1?127.0.0.1:7009?myself,master?-?0?0?9?connected?0-1364?5461-6826?10923-12287?? 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a?127.0.0.1:7002?slave?a5db243087d8bd423b9285fa8513eddee9bb59a6?0?1462963170564?7?connected?? 8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006?slave?f9886c71e98a53270f7fda961e1c5f730382d48f?0?1462963167915?3?connected?? a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005?master?-?0?1462963169538?7?connected?6827-10922?? 127.0.0.1:7009>???? ? ? 可以看到7009代替7007成了主節點。
? ? ? ?重啟7007之后，會自動變成7009的從節點。
[root@localhost?redis-cluster]#?cd?redis07?? [root@localhost?redis07]#?./redis-server?redis.conf??? [root@localhost?redis07]#?cd?../?? [root@localhost?redis-cluster]#?./redis-trib.rb?check?127.0.0.1:7007?? >>>?Performing?Cluster?Check?(using?node?127.0.0.1:7007)?? S:?ee3efb90e5ac0725f15238a64fc60a18a71205d7?127.0.0.1:7007??slots:?(0?slots)?slave??replicates?1f51443ede952b98724fea2a12f61fe710ab6cb1?? S:?50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004??slots:?(0?slots)?slave??replicates?dd19221c404fb2fc4da37229de56bab755c76f2b?? M:?1f51443ede952b98724fea2a12f61fe710ab6cb1?127.0.0.1:7009??slots:0-1364,5461-6826,10923-12287?(4096?slots)?master??2?additional?replica(s)?? S:?8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006??slots:?(0?slots)?slave??replicates?f9886c71e98a53270f7fda961e1c5f730382d48f?? M:?dd19221c404fb2fc4da37229de56bab755c76f2b?127.0.0.1:7001??slots:1365-5460?(4096?slots)?master??1?additional?replica(s)?? M:?a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005??slots:6827-10922?(4096?slots)?master??1?additional?replica(s)?? S:?1f07d76585bfab35f91ec711ac53ab4bc00f2d3a?127.0.0.1:7002??slots:?(0?slots)?slave??replicates?a5db243087d8bd423b9285fa8513eddee9bb59a6?? M:?f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003??slots:12288-16383?(4096?slots)?master??1?additional?replica(s)?? S:?2ab1b061c36f30ae35604e9a171ae3afdc3c87e5?127.0.0.1:7008??slots:?(0?slots)?slave??replicates?1f51443ede952b98724fea2a12f61fe710ab6cb1?? [OK]?All?nodes?agree?about?slots?configuration.?? >>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.?? [root@localhost?redis-cluster]#????
? ? 驗證了之前的測試。
?
六、節點的移除
? ?和節點添加一樣，移除節點也有移除主節點，從節點。
? ?1、移除主節點
? ? ? ?移除節點使用redis-trib的del-node命令，
?
redis-trib?del-node?127.0.0.1:7002??${node-id}???
? ? 127.0.0.1:7002位集群節點，node-id為要刪除的主節點。 和添加節點不同，移除節點node-id是必需的，測試刪除7001主節點：
?
[root@localhost?redis-cluster]#?./redis-trib.rb?del-node?127.0.0.1:7001?<span?style="font-size:?14px;">dd19221c404fb2fc4da37229de56bab755c76f2b</span>?? >>>?Removing?node?<span?style="font-size:?14px;">dd19221c404fb2fc4da37229de56bab755c76f2b</span>?from?cluster?127.0.0.1:7002?? [ERR]?Node?127.0.0.1:7001?is?not?empty!?Reshard?data?away?and?try?again.?? [root@localhost?redis-cluster]#????
? redis cluster提示7001已經有數據了，不能夠被刪除，需要將他的數據轉移出去，也就是和新增主節點一樣需重新分片。
?
[root@localhost?redis-cluster]#?./redis-trib.rb?reshard?127.0.0.1:7002???
? 執行以后會提示我們移除的大小，因為7001占用了4096個槽點
?
>>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.?? How?many?slots?do?you?want?to?move?(from?1?to?16384)????
? 輸入4096
? 提示移動的node id，填寫7009的node id。
?
How?many?slots?do?you?want?to?move?(from?1?to?16384)??4096?? What?is?the?receiving?node?ID?????
? ?
? ?需要移動到全部主節點上還是單個主節點
Please?enter?all?the?source?node?IDs.??Type?'all'?to?use?all?the?nodes?as?source?nodes?for?the?hash?slots.??Type?'done'?once?you?entered?all?the?source?nodes?IDs.?? Source?node?#1:??
? ?將4096個槽點移動到7009上，填寫7001的node id ：dd19221c404fb2fc4da37229de56bab755c76f2b
?
Source?node?#1:dd19221c404fb2fc4da37229de56bab755c76f2b?? Source?node?#2:done?? Do?you?want?to?proceed?with?the?proposed?reshard?plan?(yes/no)??yes???
? ?確認之后會一個一個將7001的卡槽移到到7009上。
?
[root@localhost?redis-cluster]#?./redis-trib.rb?check?127.0.0.1:7009?? >>>?Performing?Cluster?Check?(using?node?127.0.0.1:7009)?? M:?1f51443ede952b98724fea2a12f61fe710ab6cb1?127.0.0.1:7009??slots:0-6826,10923-12287?(8192?slots)?master??3?additional?replica(s)?? S:?ee3efb90e5ac0725f15238a64fc60a18a71205d7?127.0.0.1:7007??slots:?(0?slots)?slave??replicates?1f51443ede952b98724fea2a12f61fe710ab6cb1?? S:?50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004??slots:?(0?slots)?slave??replicates?1f51443ede952b98724fea2a12f61fe710ab6cb1?? M:?f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003??slots:12288-16383?(4096?slots)?master??1?additional?replica(s)?? M:?dd19221c404fb2fc4da37229de56bab755c76f2b?127.0.0.1:7001??slots:?(0?slots)?master??0?additional?replica(s)?? S:?2ab1b061c36f30ae35604e9a171ae3afdc3c87e5?127.0.0.1:7008??slots:?(0?slots)?slave??replicates?1f51443ede952b98724fea2a12f61fe710ab6cb1?? S:?1f07d76585bfab35f91ec711ac53ab4bc00f2d3a?127.0.0.1:7002??slots:?(0?slots)?slave??replicates?a5db243087d8bd423b9285fa8513eddee9bb59a6?? S:?8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006??slots:?(0?slots)?slave??replicates?f9886c71e98a53270f7fda961e1c5f730382d48f?? M:?a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005??slots:6827-10922?(4096?slots)?master??1?additional?replica(s)?? [OK]?All?nodes?agree?about?slots?configuration.?? >>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.?? [root@localhost?redis-cluster]#???
? ? ?可以看到7001有0個卡槽，而7009有8192個卡槽。
?
? ? ?在執行移除操作
? ?
[root@localhost?redis-cluster]#?./redis-trib.rb?del-node?127.0.0.1:7002?dd19221c404fb2fc4da37229de56bab755c76f2b?? >>>?Removing?node?dd19221c404fb2fc4da37229de56bab755c76f2b?from?cluster?127.0.0.1:7002?? >>>?Sending?CLUSTER?FORGET?messages?to?the?cluster...?? >>>?SHUTDOWN?the?node.?? [root@localhost?redis-cluster]#???
? ? 已經刪除了7001節點。
? 可以看到7001已經連接不了；而7001的從節點7004自動分配到了7009主節點中，7009現在3個從節點。
?
?2、移除從節點
? ? ?比如刪除7009的7008節點：
?
[root@localhost?redis-cluster]#?./redis-trib.rb?del-node?127.0.0.1:7009?2ab1b061c36f30ae35604e9a171ae3afdc3c87e5?? >>>?Removing?node?2ab1b061c36f30ae35604e9a171ae3afdc3c87e5?from?cluster?127.0.0.1:7009?? >>>?Sending?CLUSTER?FORGET?messages?to?the?cluster...?? >>>?SHUTDOWN?the?node.?? [root@localhost?redis-cluster]#?./redis-trib.rb?check?127.0.0.1:7008?? [ERR]?Sorry,?can't?connect?to?node?127.0.0.1:7008?? [root@localhost?redis-cluster]#???? ? ?刪除從節點比較方便，現在redis-cluster中有3個主節點，4個從節點，如下：
?
[root@localhost?redis-cluster]#?./redis-trib.rb?check?127.0.0.1:7009?? >>>?Performing?Cluster?Check?(using?node?127.0.0.1:7009)?? M:?1f51443ede952b98724fea2a12f61fe710ab6cb1?127.0.0.1:7009??slots:0-6826,10923-12287?(8192?slots)?master??2?additional?replica(s)?? S:?ee3efb90e5ac0725f15238a64fc60a18a71205d7?127.0.0.1:7007??slots:?(0?slots)?slave??replicates?1f51443ede952b98724fea2a12f61fe710ab6cb1?? S:?50ce1ea59106b4c2c6bc502593a6a7a7dabf5041?127.0.0.1:7004??slots:?(0?slots)?slave??replicates?1f51443ede952b98724fea2a12f61fe710ab6cb1?? M:?f9886c71e98a53270f7fda961e1c5f730382d48f?127.0.0.1:7003??slots:12288-16383?(4096?slots)?master??1?additional?replica(s)?? S:?1f07d76585bfab35f91ec711ac53ab4bc00f2d3a?127.0.0.1:7002??slots:?(0?slots)?slave??replicates?a5db243087d8bd423b9285fa8513eddee9bb59a6?? S:?8bb3ede48319b46d0015440a91ab277da9353c8b?127.0.0.1:7006??slots:?(0?slots)?slave??replicates?f9886c71e98a53270f7fda961e1c5f730382d48f?? M:?a5db243087d8bd423b9285fa8513eddee9bb59a6?127.0.0.1:7005??slots:6827-10922?(4096?slots)?master??1?additional?replica(s)?? [OK]?All?nodes?agree?about?slots?configuration.?? >>>?Check?for?open?slots...?? >>>?Check?slots?coverage...?? [OK]?All?16384?slots?covered.?? [root@localhost?redis-cluster]#???
總結
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