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Redis 集群操作
当前 Redis Cluster 状态：
| $ pwd | |
| /home/zxm/BD/redis-cluster | |
| $ ls -l | |
| 总用量 32 | |
| drwxrwxr-x. 2 zxm zxm 4096 8月 24 20:15 7000 | |
| drwxrwxr-x. 2 zxm zxm 4096 8月 24 20:22 7001 | |
| drwxrwxr-x. 2 zxm zxm 4096 8月 24 17:32 7002 | |
| drwxrwxr-x. 2 zxm zxm 4096 8月 24 20:36 7003 | |
| drwxrwxr-x. 2 zxm zxm 4096 8月 24 17:32 7004 | |
| drwxrwxr-x. 2 zxm zxm 4096 8月 24 20:23 7005 |
集群中各个节点状态：
| $ ./redis-trib.rb check 192.168.174.3:7000 | |
| >>> Performing Cluster Check (using node 192.168.174.3:7000) | |
| M: 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c 192.168.174.3:7000 | |
| slots:0-5460 (5461 slots) master | |
| 1 additional replica(s) | |
| M: ca33b3d7a60f8df7b74473f86c11f84df609fa45 192.168.174.3:7002 | |
| slots:10923-16383 (5461 slots) master | |
| 1 additional replica(s) | |
| S: 8f26d8a386853e338e7176c33e66166b5f835175 192.168.174.3:7003 | |
| slots: (0 slots) slave | |
| replicates 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c | |
| S: 46f81794cfcf6fbf10fcf18c44f137f446f28be9 192.168.174.3:7005 | |
| slots: (0 slots) slave | |
| replicates ca33b3d7a60f8df7b74473f86c11f84df609fa45 | |
| M: a2e08eda093f5b962881f309b8a3b9d5961e6aa8 192.168.174.3:7001 | |
| slots:5461-10922 (5462 slots) master | |
| 1 additional replica(s) | |
| S: 43d98665d41381c89d45c6f69bf8a2622b7b9dc3 192.168.174.3:7004 | |
| slots: (0 slots) slave | |
| replicates a2e08eda093f5b962881f309b8a3b9d5961e6aa8 | |
| [OK] All nodes agree about slots configuration. | |
| >>> Check for open slots... | |
| >>> Check slots coverage... | |
| [OK] All 16384 slots covered. |
Redis 集群 Resharding
resharding 步骤：
1) 使用命令开启 reshard 命令
./redis-trib.rb reshard host:port
2) 指定需要重新 reshard 的 slots 个数
How many slots do you want to move (from 1 to 16384)? 1000
3) 指定需要接收的节点 ID
What is the receiving node ID? 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c
4) 指定需要重新 shard 的节点，输入 done 开始 reshard
Source node #1:ca33b3d7a60f8df7b74473f86c11f84df609fa45
Source node #2:done
具体操作流程如下：
| $ ./redis-trib.rb reshard 192.168.174.3:7000 | |
| >>> Performing Cluster Check (using node 192.168.174.3:7000) | |
| M: 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c 192.168.174.3:7000 | |
| slots:0-5460 (5461 slots) master | |
| 1 additional replica(s) | |
| M: ca33b3d7a60f8df7b74473f86c11f84df609fa45 192.168.174.3:7002 | |
| slots:10923-16383 (5461 slots) master | |
| 1 additional replica(s) | |
| S: 8f26d8a386853e338e7176c33e66166b5f835175 192.168.174.3:7003 | |
| slots: (0 slots) slave | |
| replicates 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c | |
| S: 46f81794cfcf6fbf10fcf18c44f137f446f28be9 192.168.174.3:7005 | |
| slots: (0 slots) slave | |
| replicates ca33b3d7a60f8df7b74473f86c11f84df609fa45 | |
| M: a2e08eda093f5b962881f309b8a3b9d5961e6aa8 192.168.174.3:7001 | |
| slots:5461-10922 (5462 slots) master | |
| 1 additional replica(s) | |
| S: 43d98665d41381c89d45c6f69bf8a2622b7b9dc3 192.168.174.3:7004 | |
| slots: (0 slots) slave | |
| replicates a2e08eda093f5b962881f309b8a3b9d5961e6aa8 | |
| [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)? 1000 | |
| What is the receiving node ID? 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c | |
| 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:ca33b3d7a60f8df7b74473f86c11f84df609fa45 | |
| Source node #2:done | |
| Ready to move 1000 slots. | |
| Source nodes: | |
| M: ca33b3d7a60f8df7b74473f86c11f84df609fa45 192.168.174.3:7002 | |
| slots:10923-16383 (5461 slots) master | |
| 1 additional replica(s) | |
| Destination node: | |
| M: 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c 192.168.174.3:7000 | |
| slots:0-5460 (5461 slots) master | |
| 1 additional replica(s) | |
| Resharding plan: | |
| Moving slot 10923 from ca33b3d7a60f8df7b74473f86c11f84df609fa45 | |
| ... ... | |
| Moving slot 11921 from ca33b3d7a60f8df7b74473f86c11f84df609fa45 | |
| Moving slot 11922 from ca33b3d7a60f8df7b74473f86c11f84df609fa45 | |
| Do you want to proceed with the proposed reshard plan (yes/no)?yes | |
| Moving slot 10923 from 192.168.174.3:7002 to 192.168.174.3:7000: | |
| Moving slot 10924 from 192.168.174.3:7002 to 192.168.174.3:7000: | |
| ... ... | |
| Moving slot 11921 from 192.168.174.3:7002 to 192.168.174.3:7000: | |
| Moving slot 11922 from 192.168.174.3:7002 to 192.168.174.3:7000: |
重新 sharding 后集群中各个节点状态：
| $ ./redis-trib.rb check 192.168.174.3:7000 | |
| >>> Performing Cluster Check (using node 192.168.174.3:7000) | |
| M: 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c 192.168.174.3:7000 | |
| slots:0-5460,10923-11922 (6461 slots) master | |
| 1 additional replica(s) | |
| M: ca33b3d7a60f8df7b74473f86c11f84df609fa45 192.168.174.3:7002 | |
| slots:11923-16383 (4461 slots) master | |
| 1 additional replica(s) | |
| S: 8f26d8a386853e338e7176c33e66166b5f835175 192.168.174.3:7003 | |
| slots: (0 slots) slave | |
| replicates 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c | |
| S: 46f81794cfcf6fbf10fcf18c44f137f446f28be9 192.168.174.3:7005 | |
| slots: (0 slots) slave | |
| replicates ca33b3d7a60f8df7b74473f86c11f84df609fa45 | |
| M: a2e08eda093f5b962881f309b8a3b9d5961e6aa8 192.168.174.3:7001 | |
| slots:5461-10922 (5462 slots) master | |
| 1 additional replica(s) | |
| S: 43d98665d41381c89d45c6f69bf8a2622b7b9dc3 192.168.174.3:7004 | |
| slots: (0 slots) slave | |
| replicates a2e08eda093f5b962881f309b8a3b9d5961e6aa8 | |
| [OK] All nodes agree about slots configuration. | |
| >>> Check for open slots... | |
| >>> Check slots coverage... | |
| [OK] All 16384 slots covered. |
新增节点
1) 添加节点
添加 redis 实例，端口为 7006
$ cp -r 7005 7006
修改 7006 目录中 redis-cluster.conf 文件中的参数：
| $ cat 7006/redis-cluster.conf | |
| bind 192.168.174.3 | |
| port 7006 | |
| daemonize yes | |
| logfile "/home/zxm/BD/redis-cluster/7006/redis.log" | |
| cluster-enabled yes | |
| cluster-config-file nodes.conf | |
| cluster-node-timeout 5000 | |
| appendonly yes |
启动 redis 实例节点
| cd 7006 | |
| redis-server redis-cluster.conf |
添加 Salve 节点
方式一：
1）将新的节点添加到集群中
| $ ./redis-trib.rb add-node 192.168.174.3:7006 192.168.174.3:7000 | |
| >>> Adding node 192.168.174.3:7006 to cluster 192.168.174.3:7000 | |
| >>> Performing Cluster Check (using node 192.168.174.3:7000) | |
| ... ... | |
| [OK] All nodes agree about slots configuration. | |
| >>> Check for open slots... | |
| >>> Check slots coverage... | |
| [OK] All 16384 slots covered. | |
| >>> Send CLUSTER MEET to node 192.168.174.3:7006 to make it join the cluster. | |
| [OK] New node added correctly. |
2) 进入 redis 命令行, 并查看集群状态
| $ redis-cli -c -h 192.168.174.3 -p 7006 | |
| 192.168.174.3:7006> cluster nodes | |
| fca935760ac28db5cbdc5396b5a326a85e4f8760 192.168.174.3:7006 myself,master - 0 0 0 connected | |
| 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c 192.168.174.3:7000 master - 0 1472046744344 7 connected 0-5460 10923-11922 | |
| ... |
可以看到默认将新添加的节点作为 master
3）将新节点修改为 7000 节点的 slave，并查看修改后的集群状态
| 192.168.174.3:7006> cluster replicate 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c | |
| OK | |
| 192.168.174.3:7006> cluster nodes | |
| ... | |
| fca935760ac28db5cbdc5396b5a326a85e4f8760 192.168.174.3:7006 myself,slave 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c 0 0 0 connected | |
| 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c 192.168.174.3:7000 master - 0 1472047082185 7 connected 0-5460 10923-11922 | |
| ... |
方式二：
1) 将新节点直接作为 7000 节点的 slave 添加到集群中
| $ ./redis-trib.rb add-node --slave --master-id 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c 192.168.174.3:7006 192.168.174.3:7000 | |
| Adding node 192.168.174.3:7006 to cluster 192.168.174.3:7000 | |
| Performing Cluster Check (using node 192.168.174.3:7000) | |
| ... | |
| [OK] All nodes agree about slots configuration. | |
| Check for open slots... | |
| Check slots coverage... | |
| [OK] All 16384 slots covered. | |
| Send CLUSTER MEET to node 192.168.174.3:7006 to make it join the cluster. | |
| Waiting for the cluster to join. | |
| Configure node as replica of 192.168.174.3:7000. | |
| [OK] New node added correctly. |
2) 查看集群状态
| $ ./redis-trib.rb check 192.168.174.3:7001 | |
| Performing Cluster Check (using node 192.168.174.3:7001) | |
| ... | |
| M: 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c 192.168.174.3:7000 | |
| slots:0-5460,10923-11922 (6461 slots) master | |
| 2 additional replica(s) | |
| S: 1a0d5c686108182ab2ea7ca136c8e726d077171e 192.168.174.3:7006 | |
| slots: (0 slots) slave | |
| replicates 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c | |
| ... | |
| [OK] All nodes agree about slots configuration. | |
| Check for open slots... | |
| Check slots coverage... | |
| [OK] All 16384 slots covered. |
删除节点
删除 7000 节点，并将 7000 端口节点上的 slots 分配到 7006 上
1) 将 7006 节点作为 master 节点添加到集群中，并察看集群状态：
| [zxm@node1 src]$ ./redis-trib.rb check 192.168.174.3:7001 | |
| Performing Cluster Check (using node 192.168.174.3:7001) | |
| M: d7a7e6e57827d94803a139f6f36425276c9e1019 192.168.174.3:7006 | |
| slots: (0 slots) master | |
| 0 additional replica(s) | |
| M: 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c 192.168.174.3:7000 | |
| slots:0-5460,10923-11922 (6461 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. |
2) 对集群进行 reshard 操作，将 7000 节点上的所有 slots 转移到 7006 节点上
| [zxm@node1 src]$ ./redis-trib.rb reshard 192.168.174.3:7000 | |
| >>> Performing Cluster Check (using node 192.168.174.3:7000) | |
| M: 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c 192.168.174.3:7000 | |
| slots:0-5460,10923-11922 (6461 slots) master | |
| 1 additional replica(s) | |
| ... ... | |
| M: d7a7e6e57827d94803a139f6f36425276c9e1019 192.168.174.3:7006 | |
| slots: (0 slots) master | |
| 0 additional replica(s) | |
| [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)? 6461 | |
| What is the receiving node ID? d7a7e6e57827d94803a139f6f36425276c9e1019 | |
| 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 #1:7f12512f46ce8e0bac2fffcb7ca05c9941d2864c | |
| Source node #2:done |
3) 查看集群状态
| $ ./redis-trib.rb check 192.168.174.3:7001 | |
| Performing Cluster Check (using node 192.168.174.3:7001) | |
| ... | |
| M: d7a7e6e57827d94803a139f6f36425276c9e1019 192.168.174.3:7006 | |
| slots:0-5460,10923-11922 (6461 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. |
4) 删除 7000 节点
| $ ./redis-trib.rb del-node 192.168.174.3:7000 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c | |
| Removing node 7f12512f46ce8e0bac2fffcb7ca05c9941d2864c from cluster 192.168.174.3:7000 | |
| Sending CLUSTER FORGET messages to the cluster... | |
| SHUTDOWN the node. |
⚠️删除 master 节点时，该节点上 slots 必须为零
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本文永久更新链接地址：http://www.linuxidc.com/Linux/2017-03/141404.htm
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