Redis Cluster添加、删除的完整操作步骤

(编辑：jimmy 日期: 2024/11/18 浏览：3 次 )

前言

最近学习了Redis，发现Redis还是挺好玩的，今天测试了集群的添加、删除节点、重分配slot等。更深入的理解redis的游戏规则。步骤繁多，但是详细，话不多说了，来一起看看详细的介绍吧。

环境解释：

我是在一台Centos 6.9上测试的，各个redis节点以端口号区分。文中针对各个redis，我只是以端口号代表。

~~~~Master Node~~~~~
172.16.32.116:7000
172.16.32.116:7001
172.16.32.116:7002
~~~~Slave Node~~~~~
172.16.32.116:8000
172.16.32.116:8001
172.16.32.116:8002
~~~~用来折腾的Node~~~~~
172.16.32.116:9000
172.16.32.116:9001

1. 创建redis集群

注：更多redis集群创建，请参阅

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: 172.16.32.116:7000 172.16.32.116:7001 172.16.32.116:7002 Adding replica 172.16.32.116:8000 to 172.16.32.116:7000 Adding replica 172.16.32.116:8001 to 172.16.32.116:7001 Adding replica 172.16.32.116:8002 to 172.16.32.116:7002 M: a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 slots:0-5460 (5461 slots) master M: 273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 slots:5461-10922 (5462 slots) master M: 88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 slots:10923-16383 (5461 slots) master S: aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 replicates a0b91f48e933c1f1d427c54917ce970bd25d29f8 S: a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 replicates 273107e5ac994d675749be0979556e761274bb93 S: 3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 replicates 88fe075375295b59eabe69fa1438ed7c7c314f43 Can I set the above configuration"htmlcode">

# ./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 88fe075375295b59eabe69fa1438ed7c7c314f43
S: a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001
 slots: (0 slots) slave
 replicates 273107e5ac994d675749be0979556e761274bb93
S: 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.

~~~~~~~~~~~~~~~~~~~~~~~~~~~添加节点~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

3. 添加新节点redis-trib.rb add-node 新增节点名原集群节点名

# ./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 88fe075375295b59eabe69fa1438ed7c7c314f43
S: a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001
 slots: (0 slots) slave
 replicates 273107e5ac994d675749be0979556e761274bb93
S: 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. 查看当前集群状态，9000是一个空的Master

# ./redis-cli -p 9000 cluster nodes
a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505321254767 1 connected 0-5460
273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505321250759 2 connected 5461-10922
88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505321251761 3 connected 10923-16383
3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505321255769 3 connected
aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505321253765 1 connected
a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505321256771 2 connected

5. 为9000分配slot， redis的solt是固定的，就16384个，只能从其他节点获取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 88fe075375295b59eabe69fa1438ed7c7c314f43 S: aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slots: (0 slots) slave replicates a0b91f48e933c1f1d427c54917ce970bd25d29f8 M: 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)"htmlcode">

# ./redis-cli -p 9000 cluster nodes
a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505324905062 1 connected 99-5460
273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505324910075 2 connected 5562-10922
364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,master - 0 0 7 connected 0-98 5461-5561 10923-11021
3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505324908070 3 connected
aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505324911077 1 connected
88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505324902057 3 connected 11022-16383
a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505324909073 2 connected

~~~~~~~~~~~~~~~~~~~~~~~~~~~将9000变为slave~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

7. 希望将9000变成7000的slave，但是由于有slot，执行失败，需要先转移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. 删除节点也是不可以的，总之，只要上面有slot。redis是不会让你删除的，而且需要人工介入，rebalance这些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 88fe075375295b59eabe69fa1438ed7c7c314f43 S: aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slots: (0 slots) slave replicates a0b91f48e933c1f1d427c54917ce970bd25d29f8 M: 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)"htmlcode">

# ./redis-cli -p 9000 cluster nodes
a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505328938056 8 connected 0-5561 10923-11021
273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505328939059 2 connected 5562-10922
364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,master - 0 0 7 connected
3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505328936053 3 connected
aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505328933046 8 connected
88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505328937054 3 connected 11022-16383
a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505328934049 2 connected

11. 再次执行命令，将9000变成7000的slave，成功

# redis-cli -c -p 9000 cluster replicate a0b91f48e933c1f1d427c54917ce970bd25d29f8
OK

12. 查看状态,9000已经成为7000的slave

# ./redis-cli -p 9000 cluster nodes
a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505329564286 8 connected 0-5561 10923-11021
273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329561281 2 connected 5562-10922
364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 0 7 connected <<<<<<<<<<<<<<
3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329558274 3 connected
aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329554266 8 connected
88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329563285 3 connected 11022-16383
a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329562283 2 connected

13. 删除节点9000，成功删除

# ./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. 连接9000，发现已经shutdown，无法连接

# ./redis-cli -p 9000 cluster nodes
Could not connect to Redis at 127.0.0.1:9000: Connection refused
Could not connect to Redis at 127.0.0.1:9000: Connection refused

15. 查看集群状态，9000已经不见了

# ./redis-cli -p 7000 cluster nodes
88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329693835 3 connected 11022-16383
273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329694837 2 connected 5562-10922
a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 myself,master - 0 0 8 connected 0-5561 10923-11021
3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329696841 6 connected
a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329695840 5 connected
aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329692833 8 connected

~~~~~~~~~~~~~~~~~~~~~~~~~~~再次启动9000，发现不同~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

16. 再次启动9000，发现一个有意思的事情。上面检查7000，集群已经没有9000了

# ./redis-cli -p 7000 cluster nodes
88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329898241 3 connected 11022-16383
273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329899242 2 connected 5562-10922
a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 myself,master - 0 0 8 connected 0-5561 10923-11021
3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329902249 6 connected
a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329901246 5 connected
aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329900244 8 connected

17. 但是查看9000，确仍然能看到整个集群的信息。

说明，在删除节点的过程，只是在原有集群中删除9000的信息。但是9000自身的信息并没有被删除，依然保留全部的信息，只是9000实例被关闭而已。

# ./redis-cli -p 9000 cluster nodes
a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505329902003 8 connected 0-5561 10923-11021
273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329903006 2 connected 5562-10922
3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329906013 3 connected
a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329908019 2 connected
aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329904008 8 connected
364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 0 7 connected
88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329907016 3 connected 11022-16383

18. 而9000的全部信息，是记录在自身目录的nodes.conf中

# more nodes.conf
a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505329544244 8 connected 0-5561 10923-11021
273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329542241 2 connected 5562-10922
364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 0 7 connected
3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329541239 3 connected
aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329545246 8 connected
88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329543242 3 connected 11022-16383
a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329546248 2 connected
vars currentEpoch 8 lastVoteEpoch 0

19. 到7001等其他节点中查看，nodes.conf已经没有9000的信息

# more nodes.conf
273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 myself,master - 0 0 2 connected 5562-10922
a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505329680312 8 connected 0-5561 10923-11021
aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329684319 8 connected
3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329686321 6 connected
a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329685318 5 connected
88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329683317 3 connected 11022-16383
vars currentEpoch 8 lastVoteEpoch 0

~~~~~~~~~~~~~~~~~~~~~~~~~~~再次添加9000，以及9001~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

20. 将9000和9001再次加入集群，开始下面的折腾。

注意：需要将9000和9001下的redis.conf外的文件清除，重启。然后才能再次加入集群。不然会遇到错误：

[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. 现在是两个空的Master节点

# ./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个slot到9000上，其实redis很聪明的，我连接的是9001，但是在分配的时候，它会问你，receiving node是谁，Source node 是谁。

# ./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)"htmlcode">

# redis-cli -p 7001 cluster nodes
273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 myself,master - 0 0 2 connected 5662-10922
a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505330856605 8 connected 0-5561 10923-11021
aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505330853598 8 connected
3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505330860611 6 connected
a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505330859608 5 connected
c4ba7a1f537ac66076791461d6af9012741fee74 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 11022-16383
dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 172.16.32.116:9000 master - 0 1505330858607 10 connected 5562-5661    <<<<<<<<<<<<<<<<<<<<<从7001要来100个slot

25. 将9001添加为9000的slave节点 redis-cli -p <slave IP:port> cluster nodes <Master ID 号>

# redis-cli -p 9001 cluster nodes dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516
273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 myself,master - 0 0 2 connected 5662-10922
a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505331457798 8 connected 0-5561 10923-11021
aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505331454791 8 connected
3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505331456795 6 connected
a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505331458799 10 connected
c4ba7a1f537ac66076791461d6af9012741fee74 172.16.32.116:9001 slave dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 0 1505331459801 10 connected
88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505331455793 3 connected 11022-16383
dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 172.16.32.116:9000 master - 0 1505331453788 10 connected 5562-5661

经过各种折腾，redis添加，删除，重分配slot等操作，都测试完了。

中间有很多命令输出部门，视乎有点重复。但是为了更好的阅读理解，观察每一步操作的变化。后面查阅也更容易一些。
毕竟，年纪大了，记性不好。好多自己写过的blog，回头翻阅的时候，发现某些步骤，不是很好理解了。虽然我的blog，都是基于自己测试的结果，但是依然会忘记。

总结

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