redis搭建集群 - 增加节点

客官°小女子只卖身不卖艺 2022-02-17 03:01 374阅读 0赞

集群扩容- 增加节点

  1. 新增redis服务：(:1,$s/6381/8382/g  替换)
  2.     192.168.2.111:6381
  3.     192.168.2.111:6382
  4.     增加节点必须是一对，一个主节点一个从节点(手动分配6382是6381的从服务)，注意对外开放对应的端口和监控端口(10000+端口)
  6. 一：主节点
  8. 1：把节点添加到集群中
  9. [root@192 redis6382]$ redis-cli --cluster add-node 192.168.2.111:6381 192.168.2.111:6379
  10. >>> Adding node 192.168.2.111:6381 to cluster 192.168.2.111:6379
  11. >>> Performing Cluster Check (using node 192.168.2.111:6379)
  12. M: 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a 192.168.2.111:6379
  13.    slots:[0-5460] (5461 slots) master
  14.    1 additional replica(s)
  15. M: 75b477ef4967c1bf50502cb834df3fd5660cfa22 192.168.2.112:6379
  16.    slots:[5461-10922] (5462 slots) master
  17.    1 additional replica(s)
  18. M: ebc80d8dcabe30645b96fdfe08de84f52a42cbff 192.168.2.113:6379
  19.    slots:[10923-16383] (5461 slots) master
  20.    1 additional replica(s)
  21. S: e6d09dcaa252336190e4e8747a60d067572d5156 192.168.2.112:6380
  22.    slots: (0 slots) slave
  23.    replicates ebc80d8dcabe30645b96fdfe08de84f52a42cbff
  24. S: f3dbdddc6c2dc23e1dde2e6e6662c6c5ebf167e9 192.168.2.111:6380
  25.    slots: (0 slots) slave
  26.    replicates 75b477ef4967c1bf50502cb834df3fd5660cfa22
  27. S: 5da5d0d7f7036c971926a821b33764fb2c78ea50 192.168.2.113:6380
  28.    slots: (0 slots) slave
  29.    replicates 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a
  30. [OK] All nodes agree about slots configuration.
  31. >>> Check for open slots...
  32. >>> Check slots coverage...
  33. [OK] All 16384 slots covered.
  34. >>> Send CLUSTER MEET to node 192.168.2.111:6381 to make it join the cluster.
  35. [OK] New node added correctly.
  37. 命令解释：
  38. redis-cli --cluster add-node new_host:new_port existing_host:existing_port
  39.     -> new_host:new_port: 新的ip： 新添加的端口号
  40.     -> existing_host:existing_port： 集群中任意ip和对应端口号
  43. 2：查看添加的节点在集群中的状态
  44. [root@192 redis]$ redis-cli -h 192.168.2.111 -p 6381 -c
  45. 192.168.2.111:6381> cluster nodes
  46.     4ca16d842ea07379be11371aa2381529a9b5d7bc 192.168.2.111:6381@16381 myself,master - 0 1555496064000 0 connected
  47. 结果解释：6381节点是一个master节点， connected为空说明没有分配哈希槽，不能存储数据
  49. 3：为新增的master节点分配哈希槽 -  分片操作
  50. redis-cli --cluster reshard 需要增加哈希槽的ip加端口
  52. [root@192 redis6382]# redis-cli --cluster reshard 192.168.2.111:6381
  53. >>> Performing Cluster Check (using node 192.168.2.111:6381)
  54. M: 4ca16d842ea07379be11371aa2381529a9b5d7bc 192.168.2.111:6381
  55.    slots: (0 slots) master
  56. S: f3dbdddc6c2dc23e1dde2e6e6662c6c5ebf167e9 192.168.2.111:6380
  57.    slots: (0 slots) slave
  58.    replicates 75b477ef4967c1bf50502cb834df3fd5660cfa22
  59. M: ebc80d8dcabe30645b96fdfe08de84f52a42cbff 192.168.2.113:6379
  60.    slots:[10923-16383] (5461 slots) master
  61.    1 additional replica(s)
  62. M: 75b477ef4967c1bf50502cb834df3fd5660cfa22 192.168.2.112:6379
  63.    slots:[5461-10922] (5462 slots) master
  64.    1 additional replica(s)
  65. M: 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a 192.168.2.111:6379
  66.    slots:[0-5460] (5461 slots) master
  67.    1 additional replica(s)
  68. S: e6d09dcaa252336190e4e8747a60d067572d5156 192.168.2.112:6380
  69.    slots: (0 slots) slave
  70.    replicates ebc80d8dcabe30645b96fdfe08de84f52a42cbff
  71. S: 5da5d0d7f7036c971926a821b33764fb2c78ea50 192.168.2.113:6380
  72.    slots: (0 slots) slave
  73.    replicates 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a
  74. [OK] All nodes agree about slots configuration.
  75. >>> Check for open slots...
  76. >>> Check slots coverage...
  77. [OK] All 16384 slots covered
  78. How many slots do you want to move (from 1 to 16384)? 500
  79.     -> 解释：希望分配多少个哈希槽，这里分配了500个哈希槽
  80. What is the receiving node ID? 4ca16d842ea07379be11371aa2381529a9b5d7bc
  81.     -> 解释：希望哪个节点接收这500个哈希槽(感觉废话)，id从上面取(4ca16d842ea07379be11371aa2381529a9b5d7bc)
  82. Please enter all the source node IDs.
  83. Type 'all' to use all the nodes as source nodes for the hash slots.
  84. Type 'done' once you entered all the source nodes IDs.
  85.     -> 解释：清楚如all或者done， all:从16384个哈希槽中随机分配500个槽，done:指定节点id从中分配500个
  86. Source node #1: all
  87. -> 解释：列出500个哈希槽，分别从哪些节点分配的
  88. Ready to move 500 slots.
  89. Source nodes:
  90. M: ebc80d8dcabe30645b96fdfe08de84f52a42cbff 192.168.2.113:6379
  91.    slots:[10923-16383] (5461 slots) master
  92.    1 additional replica(s)
  93. M: 75b477ef4967c1bf50502cb834df3fd5660cfa22 192.168.2.112:6379
  94.    slots:[5461-10922] (5462 slots) master
  95.    1 additional replica(s)
  96. M: 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a 192.168.2.111:6379
  97.    slots:[0-5460] (5461 slots) master
  98.    1 additional replica(s)
  99. Destination node:
  100. M: 4ca16d842ea07379be11371aa2381529a9b5d7bc 192.168.2.111:6381
  101.    slots: (0 slots) master
  102. Resharding plan:
  103.     -> 展示具体分配的是哪些哈希槽
  104.     Moving slot 5461 from 75b477ef4967c1bf50502cb834df3fd5660cfa22
  105.     .....
  106. Do you want to proceed with the proposed reshard plan (yes/no)? yes
  107.     ->解释：是否同意分配的哈希槽
  109.      -> 展示具体分配的是哪些哈希槽
  110.     Moving slot 5461 from 192.168.2.112:6379 to 192.168.2.111:6381: 
  111.     .....
  113. 4: 查看分配结果
  114. 192.168.2.111:6381> cluster nodes
  115.     4ca16d842ea07379be11371aa2381529a9b5d7bc 192.168.2.111:6381@16381 myself,master - 0 1555557769000 7 connected 0-165 5461-5627 10923-11088
  118. 二：从节点
  119. [root@192 ~]# redis-cli --cluster add-node 192.168.2.111:6382 192.168.2.111:6379  --cluster-slave --cluster-master-id  4ca16d842ea07379be11371aa2381529a9b5d7bc
  120.     结果：
  121.     >>> Adding node 192.168.2.111:6382 to cluster 192.168.2.111:6379
  122.     >>> Performing Cluster Check (using node 192.168.2.111:6379)
  123.     M: 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a 192.168.2.111:6379
  124.        slots:[166-5460] (5295 slots) master
  125.        1 additional replica(s)
  126.     M: 75b477ef4967c1bf50502cb834df3fd5660cfa22 192.168.2.112:6379
  127.        slots:[5628-10922] (5295 slots) master
  128.        1 additional replica(s)
  129.     M: 4ca16d842ea07379be11371aa2381529a9b5d7bc 192.168.2.111:6381
  130.        slots:[0-165],[5461-5627],[10923-11088] (499 slots) master
  131.     M: ebc80d8dcabe30645b96fdfe08de84f52a42cbff 192.168.2.113:6379
  132.        slots:[11089-16383] (5295 slots) master
  133.        1 additional replica(s)
  134.     S: e6d09dcaa252336190e4e8747a60d067572d5156 192.168.2.112:6380
  135.        slots: (0 slots) slave
  136.        replicates ebc80d8dcabe30645b96fdfe08de84f52a42cbff
  137.     S: f3dbdddc6c2dc23e1dde2e6e6662c6c5ebf167e9 192.168.2.111:6380
  138.        slots: (0 slots) slave
  139.        replicates 75b477ef4967c1bf50502cb834df3fd5660cfa22
  140.     S: 5da5d0d7f7036c971926a821b33764fb2c78ea50 192.168.2.113:6380
  141.        slots: (0 slots) slave
  142.        replicates 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a
  143.     [OK] All nodes agree about slots configuration.
  144.     >>> Check for open slots...
  145.     >>> Check slots coverage...
  146.     [OK] All 16384 slots covered.
  147.     >>> Send CLUSTER MEET to node 192.168.2.111:6382 to make it join the cluster.
  148.     Waiting for the cluster to join
  149.     ..
  150.     >>> Configure node as replica of 192.168.2.111:6381.
  151.     [OK] New node added correctly.
  153. 命令解释：
  154. redis-cli --cluster add-node new_host:new_port existing_host:existing_port
  155. --cluster-slave --cluster-master-id  <arg>
  157. 2：查看节点信息
  158. [root@192 ~]# redis-cli --cluster check 192.168.2.111:6382
  159.     结果：
  160.     192.168.2.111:6379 (63cfbaf1...) -> 1 keys | 5295 slots | 1 slaves.
  161.     192.168.2.112:6379 (75b477ef...) -> 1 keys | 5295 slots | 1 slaves.
  162.     192.168.2.113:6379 (ebc80d8d...) -> 0 keys | 5295 slots | 1 slaves.
  163.     192.168.2.111:6381 (4ca16d84...) -> 0 keys | 499 slots | 1 slaves.
  164.     [OK] 2 keys in 4 masters.
  165.     0.00 keys per slot on average.
  166.     >>> Performing Cluster Check (using node 192.168.2.111:6382)
  167.     S: cc3cfe29129ff7a5bcb2c5f803e8f4614b291373 192.168.2.111:6382
  168.        slots: (0 slots) slave
  169.        replicates 4ca16d842ea07379be11371aa2381529a9b5d7bc
  171.     M: 4ca16d842ea07379be11371aa2381529a9b5d7bc 192.168.2.111:6381
  172.        slots:[0-165],[5461-5627],[10923-11088] (499 slots) master
  173.        1 additional replica(s)
  174.     显示已经变成192.168.2.111:6381 的slave

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