Redis Cluster集群的搭建与实践[转]
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Redis Cluster集群的搭建与实践[转]
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Redis Cluster集群的搭建與實踐
Redis Cluster集群
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。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。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[plain] view plain copy
[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.confdaemonize yes #后臺啟動port 7001 #修改端口號，從7001到7006cluster-enabled yes #開啟cluster，去掉注釋cluster-config-file nodes.confcluster-node-timeout 15000appendonly 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[plain] view plain copy
[root@localhost redis-cluster]# cp /usr/andy/redis/redis-3.2.0/src/redis-trib.rb ./ 安裝ruby環境：[plain] view plain copy
[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[plain] view plain copy
[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[plain] view plain copy
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[plain] view plain copy
[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[plain] view plain copy
[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
殺死全部的幾點：[plain] view plain copy
[root@localhost redis-cluster]# pkill -9 redis 4、使用redis-trib.rb創建集群[plain] view plain copy
./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。[plain] view plain copy
[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
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[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
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[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[plain] view plain copy
[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。[plain] view plain copy
[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[plain] view plain copy
[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：[plain] view plain copy
[root@localhost redis01]# ./redis-cli -c -p 7001 127.0.0.1:7001> get name -> Redirected to slot [5798] located at 127.0.0.1:7005 "andy" 127.0.0.1:7005> 127.0.0.1:7005>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。[plain] view plain copy
[root@localhost redis-cluster]# cd redis02 [root@localhost redis02]# ./redis-server redis.conf [root@localhost redis02]# 在check一下7002節點[plain] view plain copy
[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
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[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[plain] view plain copy
[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
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./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[plain] view plain copy
[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?？梢詂heck以下7007節點狀態[plain] view plain copy
[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
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[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 reshardredis-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：[plain] view plain copy
[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。[plain] view plain copy
[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[plain] view plain copy
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：[plain] view plain copy
Source node #1:all 然后開始從別的主節點遷移哈希槽，并且確認。[plain] view plain copy
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。[plain] view plain copy
[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。
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[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。[plain] view plain copy
[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.confredis-trib增加從節點的命令為：
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./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?，F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。[plain] view plain copy
[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?？梢詂heck一下7008：[plain] view plain copy
[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。[plain] view plain copy
[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[plain] view plain copy
[root@localhost redis-cluster]# ./redis-trib.rb add-node --slave --master-id ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7009 127.0.0.1:7001 >>> Adding node 127.0.0.1:7009 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) S: 2ab1b061c36f30ae35604e9a171ae3afdc3c87e5 127.0.0.1:7008 slots: (0 slots) slave replicates ee3efb90e5ac0725f15238a64fc60a18a71205d7 M: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007 slots:0-1364,5461-6826,10923-12287 (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: 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. >>> Send CLUSTER MEET to node 127.0.0.1:7009 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]# 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：[plain] view plain copy
[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。[plain] view plain copy
[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。[plain] view plain copy
[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
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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：[plain] view plain copy
[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。
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[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
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>>> 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。
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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
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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
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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。
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[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[plain] view plain copy
[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。[plain] view plain copy
[root@localhost redis-cluster]# ./redis-trib.rb check 127.0.0.1:7001 [ERR] Sorry, can't connect to node 127.0.0.1:7001 [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) 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：[plain] view plain copy
[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：[plain] view plain copy
[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]#ok，測試到這兒吧。
轉載于:https://blog.51cto.com/9280078/2129919
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