前言
最近學習了Redis，發(fā)現(xiàn)Redis還是挺好玩的，今天測試了集群的添加、刪除節(jié)點、重分配slot等。更深入的理解redis的游戲規(guī)則。步驟繁多，但是詳細，話不多說了，來一起看看詳細的介紹吧。
環(huán)境解釋：
我是在一臺Centos 6.9上測試的，各個redis節(jié)點以端口號區(qū)分。文中針對各個redis，我只是以端口號代表。
~~~~Master Node~~~~~172.16.32.116:7000172.16.32.116:7001172.16.32.116:7002~~~~Slave Node~~~~~172.16.32.116:8000172.16.32.116:8001172.16.32.116:8002~~~~用來折騰的Node~~~~~172.16.32.116:9000172.16.32.116:9001
1. 創(chuàng)建redis集群
注：更多redis集群創(chuàng)建，請參閱
Redis Cluster集群部署搭建
# ./redis-trib.rb create --replicas 1 172.16.32.116:7000 172.16.32.116:7001 172.16.32.116:7002 172.16.32.116:8000 172.16.32.116:8001 172.16.32.116:8002>>> Creating cluster>>> Performing hash slots allocation on 6 nodes...Using 3 masters:172.16.32.116:7000172.16.32.116:7001172.16.32.116:7002Adding replica 172.16.32.116:8000 to 172.16.32.116:7000Adding replica 172.16.32.116:8001 to 172.16.32.116:7001Adding replica 172.16.32.116:8002 to 172.16.32.116:7002M: a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 slots:0-5460 (5461 slots) masterM: 273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 slots:5461-10922 (5462 slots) masterM: 88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 slots:10923-16383 (5461 slots) masterS: aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 replicates a0b91f48e933c1f1d427c54917ce970bd25d29f8S: a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 replicates 273107e5ac994d675749be0979556e761274bb93S: 3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 replicates 88fe075375295b59eabe69fa1438ed7c7c314f43Can 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 clusterWaiting for the cluster to join...>>> Performing Cluster Check (using node 172.16.32.116:7000)M: a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 slots:0-5460 (5461 slots) masterM: 273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 slots:5461-10922 (5462 slots) masterM: 88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 slots:10923-16383 (5461 slots) masterM: aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slots: (0 slots) master replicates a0b91f48e933c1f1d427c54917ce970bd25d29f8M: a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slots: (0 slots) master replicates 273107e5ac994d675749be0979556e761274bb93M: 3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slots: (0 slots) master replicates 88fe075375295b59eabe69fa1438ed7c7c314f43[OK] All nodes agree about slots configuration.>>> Check for open slots...>>> Check slots coverage...[OK] All 16384 slots covered.
2. 檢查集群狀態(tài)
# ./redis-trib.rb check 172.16.32.116:7000>>> Performing Cluster Check (using node 172.16.32.116:7000)M: a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 slots:0-5460 (5461 slots) master 1 additional replica(s)M: 88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 slots:10923-16383 (5461 slots) master 1 additional replica(s)M: 273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 slots:5461-10922 (5462 slots) master 1 additional replica(s)S: 3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slots: (0 slots) slave replicates 88fe075375295b59eabe69fa1438ed7c7c314f43S: a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slots: (0 slots) slave replicates 273107e5ac994d675749be0979556e761274bb93S: aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slots: (0 slots) slave replicates a0b91f48e933c1f1d427c54917ce970bd25d29f8[OK] All nodes agree about slots configuration.>>> Check for open slots...>>> Check slots coverage...[OK] All 16384 slots covered.
~~~~~~~~~~~~~~~~~~~~~~~~~~~添加節(jié)點~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3. 添加新節(jié)點redis-trib.rb add-node 新增節(jié)點名 原集群節(jié)點名
# ./redis-trib.rb add-node 172.16.32.116:9000 172.16.32.116:7000>>> Adding node 172.16.32.116:9000 to cluster 172.16.32.116:7000>>> Performing Cluster Check (using node 172.16.32.116:7000)M: a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 slots:0-5460 (5461 slots) master 1 additional replica(s)M: 88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 slots:10923-16383 (5461 slots) master 1 additional replica(s)M: 273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 slots:5461-10922 (5462 slots) master 1 additional replica(s)S: 3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slots: (0 slots) slave replicates 88fe075375295b59eabe69fa1438ed7c7c314f43S: a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slots: (0 slots) slave replicates 273107e5ac994d675749be0979556e761274bb93S: aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slots: (0 slots) slave replicates a0b91f48e933c1f1d427c54917ce970bd25d29f8[OK] All nodes agree about slots configuration.>>> Check for open slots...>>> Check slots coverage...
4. 查看當前集群狀態(tài)，9000是一個空的Master
# ./redis-cli -p 9000 cluster nodesa0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505321254767 1 connected 0-5460273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505321250759 2 connected 5461-1092288fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505321251761 3 connected 10923-163833d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505321255769 3 connectedaeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505321253765 1 connecteda96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505321256771 2 connected
5. 為9000分配slot， redis的solt是固定的，就16384個，只能從其他節(jié)點獲取slot，然后分配到9000
# ./redis-trib.rb reshard 172.16.32.116:9000>>> Performing Cluster Check (using node 172.16.32.116:9000)M: 364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 slots: (0 slots) master 0 additional replica(s)M: a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 slots:0-5460 (5461 slots) master 1 additional replica(s)M: 273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 slots:5461-10922 (5462 slots) master 1 additional replica(s)S: 3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slots: (0 slots) slave replicates 88fe075375295b59eabe69fa1438ed7c7c314f43S: aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slots: (0 slots) slave replicates a0b91f48e933c1f1d427c54917ce970bd25d29f8M: 88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 slots:10923-16383 (5461 slots) master 1 additional replica(s)S: a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slots: (0 slots) slave replicates 273107e5ac994d675749be0979556e761274bb93[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)? What is the receiving node ID? 364ae8322ab2627e25b05d45b702448c74afad10 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:all Ready to move 300 slots. Source nodes: M: a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 slots:0-5460 (5461 slots) master 1 additional replica(s) M: 273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 slots:5461-10922 (5462 slots) master 1 additional replica(s) M: 88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 slots:10923-16383 (5461 slots) master 1 additional replica(s) Destination node: M: 364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 slots: (0 slots) master 0 additional replica(s) Resharding plan: Moving slot 5461 from 273107e5ac994d675749be0979556e761274bb93 Moving slot 5469 from 273107e5ac994d675749be0979556e761274bb93Do you want to proceed with the proposed reshard plan (yes/no)? yesMoving slot 5461 from 172.16.32.116:7001 to 172.16.32.116:9000:
6. 可以看到，9000已經(jīng)分配到的slot是0-98 5461-5561 10923-11021
# ./redis-cli -p 9000 cluster nodesa0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505324905062 1 connected 99-5460273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505324910075 2 connected 5562-10922364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,master - 0 0 7 connected 0-98 5461-5561 10923-110213d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505324908070 3 connectedaeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505324911077 1 connected88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505324902057 3 connected 11022-16383a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505324909073 2 connected
~~~~~~~~~~~~~~~~~~~~~~~~~~~將9000變?yōu)閟lave~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7. 希望將9000變成7000的slave，但是由于有slot，執(zhí)行失敗，需要先轉移slot
# redis-cli -c -p 9000 cluster replicate a0b91f48e933c1f1d427c54917ce970bd25d29f8(error) ERR To set a master the node must be empty and without assigned slots.
8. 刪除節(jié)點也是不可以的，總之，只要上面有slot。redis是不會讓你刪除的，而且需要人工介入，rebalance這些slot之后才行
# ./redis-trib.rb del-node 172.16.32.116:9000 364ae8322ab2627e25b05d45b702448c74afad10>>> Removing node 364ae8322ab2627e25b05d45b702448c74afad10 from cluster 172.16.32.116:9000[ERR] Node 172.16.32.116:9000 is not empty! Reshard data away and try again.
9.重新分配9000的slot到7000上
# ./redis-trib.rb reshard 172.16.32.116:9000 <<<<<<重新分配slot>>> Performing Cluster Check (using node 172.16.32.116:9000)M: 364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 slots:0-98,5461-5561,10923-11021 (299 slots) master 0 additional replica(s)M: a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 slots:99-5460 (5362 slots) master 1 additional replica(s)M: 273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 slots:5562-10922 (5361 slots) master 1 additional replica(s)S: 3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slots: (0 slots) slave replicates 88fe075375295b59eabe69fa1438ed7c7c314f43S: aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slots: (0 slots) slave replicates a0b91f48e933c1f1d427c54917ce970bd25d29f8M: 88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 slots:11022-16383 (5362 slots) master 1 additional replica(s)S: a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slots: (0 slots) slave replicates 273107e5ac994d675749be0979556e761274bb93[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)? 300 <<<9000節(jié)點全部需要遷移的節(jié)點What is the receiving node ID? a0b91f48e933c1f1d427c54917ce970bd25d29f8 <<<<<<7000的IDPlease 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 #1:364ae8322ab2627e25b05d45b702448c74afad10 <<<<<<9000的IDSource node #2:doneReady to move 300 slots. Source nodes: M: 364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 <<<<<<Source nodes slots:0-98,5461-5561,10923-11021 (299 slots) master 0 additional replica(s) Destination node: M: a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 <<<<<<<Destination node slots:99-5460 (5362 slots) master 1 additional replica(s) Resharding plan: Moving slot 0 from 364ae8322ab2627e25b05d45b702448c74afad10......... Moving slot 11021 from 364ae8322ab2627e25b05d45b702448c74afad10Do you want to proceed with the proposed reshard plan (yes/no)? yesMoving slot 0 from 172.16.32.116:9000 to 172.16.32.116:7000:Moving slot 1 from 172.16.32.116:9000 to 172.16.32.116:7000:........
10. 查詢，可以看到9000已經(jīng)沒有slot了
# ./redis-cli -p 9000 cluster nodesa0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505328938056 8 connected 0-5561 10923-11021273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505328939059 2 connected 5562-10922364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,master - 0 0 7 connected3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505328936053 3 connectedaeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505328933046 8 connected88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505328937054 3 connected 11022-16383a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505328934049 2 connected
11. 再次執(zhí)行命令，將9000變成7000的slave，成功
# redis-cli -c -p 9000 cluster replicate a0b91f48e933c1f1d427c54917ce970bd25d29f8OK
12. 查看狀態(tài),9000已經(jīng)成為7000的slave
# ./redis-cli -p 9000 cluster nodesa0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505329564286 8 connected 0-5561 10923-11021273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329561281 2 connected 5562-10922364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 0 7 connected <<<<<<<<<<<<<<3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329558274 3 connectedaeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329554266 8 connected88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329563285 3 connected 11022-16383a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329562283 2 connected
13. 刪除節(jié)點9000，成功刪除
# ./redis-trib.rb del-node 172.16.32.116:9000 364ae8322ab2627e25b05d45b702448c74afad10>>> Removing node 364ae8322ab2627e25b05d45b702448c74afad10 from cluster 172.16.32.116:9000>>> Sending CLUSTER FORGET messages to the cluster...>>> SHUTDOWN the node.
14. 連接9000，發(fā)現(xiàn)已經(jīng)shutdown，無法連接
# ./redis-cli -p 9000 cluster nodesCould not connect to Redis at 127.0.0.1:9000: Connection refusedCould not connect to Redis at 127.0.0.1:9000: Connection refused
15. 查看集群狀態(tài)，9000已經(jīng)不見了
# ./redis-cli -p 7000 cluster nodes88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329693835 3 connected 11022-16383273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329694837 2 connected 5562-10922a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 myself,master - 0 0 8 connected 0-5561 10923-110213d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329696841 6 connecteda96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329695840 5 connectedaeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329692833 8 connected
~~~~~~~~~~~~~~~~~~~~~~~~~~~再次啟動9000，發(fā)現(xiàn)不同~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
16. 再次啟動9000，發(fā)現(xiàn)一個有意思的事情。上面檢查7000，集群已經(jīng)沒有9000了
# ./redis-cli -p 7000 cluster nodes88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329898241 3 connected 11022-16383273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329899242 2 connected 5562-10922a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 myself,master - 0 0 8 connected 0-5561 10923-110213d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329902249 6 connecteda96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329901246 5 connectedaeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329900244 8 connected
17. 但是查看9000，確仍然能看到整個集群的信息。
說明，在刪除節(jié)點的過程，只是在原有集群中刪除9000的信息。但是9000自身的信息并沒有被刪除，依然保留全部的信息，只是9000實例被關閉而已。
# ./redis-cli -p 9000 cluster nodesa0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505329902003 8 connected 0-5561 10923-11021273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329903006 2 connected 5562-109223d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329906013 3 connecteda96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329908019 2 connectedaeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329904008 8 connected364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 0 7 connected88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329907016 3 connected 11022-16383
18. 而9000的全部信息，是記錄在自身目錄的nodes.conf中
# more nodes.confa0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505329544244 8 connected 0-5561 10923-11021273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329542241 2 connected 5562-10922364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 0 7 connected3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329541239 3 connectedaeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329545246 8 connected88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329543242 3 connected 11022-16383a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329546248 2 connectedvars currentEpoch 8 lastVoteEpoch 0
19. 到7001等其他節(jié)點中查看，nodes.conf已經(jīng)沒有9000的信息
# more nodes.conf273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 myself,master - 0 0 2 connected 5562-10922a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505329680312 8 connected 0-5561 10923-11021aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329684319 8 connected3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329686321 6 connecteda96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329685318 5 connected88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329683317 3 connected 11022-16383vars currentEpoch 8 lastVoteEpoch 0
~~~~~~~~~~~~~~~~~~~~~~~~~~~再次添加9000，以及9001~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20. 將9000和9001再次加入集群，開始下面的折騰。
注意：需要將9000和9001下的redis.conf外的文件清除，重啟。然后才能再次加入集群。不然會遇到錯誤：
[ERR] Node 172.16.32.116:9001 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.
21. 加入集群
./redis-trib.rb add-node 172.16.32.116:9000 172.16.32.116:7002./redis-trib.rb add-node 172.16.32.116:9001 172.16.32.116:7002
22. 現(xiàn)在是兩個空的Master節(jié)點
# ./redis-trib.rb check 172.16.32.116:9001>>> Performing Cluster Check (using node 172.16.32.116:9001)M: c4ba7a1f537ac66076791461d6af9012741fee74 172.16.32.116:9001 slots: (0 slots) master 0 additional replica(s)M: dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 172.16.32.116:9000 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.
23. 重分配100個slot到9000上，其實redis很聰明的，我連接的是9001，但是在分配的時候，它會問你，receiving node是誰，Source node 是誰。
# ./redis-trib.rb reshard 172.16.32.116:9001>>> Performing Cluster Check (using node 172.16.32.116:9001)......[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)? 100What is the receiving node ID? dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 <<<<<<<<<receiving node IDPlease 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:aeb684429d220c0fd1392574d193cc1ae7577782 <<<<<<<Source node我選的是 8000*** The specified node is not known or is not a master, please retry. <<<<<<<然而，并沒能欺騙redis，它發(fā)現(xiàn)了，這個是slave，沒有slot可以提供的。 Source node #1:273107e5ac994d675749be0979556e761274bb93 <<<<<<<<Source node再次指定為7001，開始分配了Source node #2:doneReady to move 100 slots. Source nodes: M: 273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 slots:5562-10922 (5361 slots) master 1 additional replica(s) Destination node: M: dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 172.16.32.116:9000 slots: (0 slots) master 0 additional replica(s) Resharding plan: Moving slot 5562 from 273107e5ac994d675749be0979556e761274bb93 Moving slot 5563 from 273107e5ac994d675749be0979556e761274bb93
24. 查看分配情況，redis還是很聰明靈活的。
# redis-cli -p 7001 cluster nodes273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 myself,master - 0 0 2 connected 5662-10922a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505330856605 8 connected 0-5561 10923-11021aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505330853598 8 connected3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505330860611 6 connecteda96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505330859608 5 connectedc4ba7a1f537ac66076791461d6af9012741fee74 172.16.32.116:9001 master - 0 1505330862615 9 connected <<<<<<<<<<<<<<<<<<<<<依然是空的88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505330861612 3 connected 11022-16383dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 172.16.32.116:9000 master - 0 1505330858607 10 connected 5562-5661 <<<<<<<<<<<<<<<<<<<<<從7001要來100個slot
25. 將9001添加為9000的slave節(jié)點 redis-cli -p <slave IP:port> cluster nodes <Master ID 號>
# redis-cli -p 9001 cluster nodes dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 myself,master - 0 0 2 connected 5662-10922a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505331457798 8 connected 0-5561 10923-11021aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505331454791 8 connected3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505331456795 6 connecteda96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505331458799 10 connectedc4ba7a1f537ac66076791461d6af9012741fee74 172.16.32.116:9001 slave dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 0 1505331459801 10 connected88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505331455793 3 connected 11022-16383dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 172.16.32.116:9000 master - 0 1505331453788 10 connected 5562-5661
經(jīng)過各種折騰，redis添加，刪除，重分配slot等操作，都測試完了。
中間有很多命令輸出部門，視乎有點重復。但是為了更好的閱讀理解，觀察每一步操作的變化。后面查閱也更容易一些。
畢竟，年紀大了，記性不好。好多自己寫過的blog，回頭翻閱的時候，發(fā)現(xiàn)某些步驟，不是很好理解了。雖然我的blog，都是基于自己測試的結果，但是依然會忘記。
總結
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