Redis集群中删除/修改节点（master、slave）（实验）
删除一个slave节点：# redis-trib.rb del-node 192.168.2.202:6380 e4dc23dc67418bf66c6c63655110612cb9516aff
// del-nodehost:portnode-id
>>> Removing node e4dc23dc67418bf66c6c63655110612cb9516aff from cluster 192.168.2.202:6380
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
查看集群节点信息：
# redis-trib.rb check 192.168.2.100:6379 (确认slave节点已经删除)
>>> Performing Cluster Check (using node 192.168.2.100:6379)
M: 098e7eb756b6047fde988ab3c0b7189e1724ecf5 192.168.2.100:6379
slots:333-5460 (5128 slots) master
1 additional replica(s)
S: 7119dec91b086ca8fe69f7878fa42b1accd75f0f 192.168.2.100:6380
slots: (0 slots) slave
replicates 5844b4272c39456b0fdf73e384ff8c479547de47
删除一个master节点：
先移除master身上的hash slot，再删除master。
目前不能直接删除slot，要把删除的master的slot迁移到其他master节点上。
# redis-trib.rb reshard 192.168.2.100:6379 //slot迁移到2.100上
How many slots do you want to move (from 1 to 16384)? 1000
//迁移多少个slot？（要删除的master节点上有多少个slot）
What is the receiving node> //迁移到那个节点上，ID是多少？（slot迁移给谁，写谁的ID）
Please enter all the source node> Type 'all' to use all the nodes as source nodes for the hash slots.
Type 'done' once you entered all the source nodes> Source node #1:8326ff0be199fa0d4db74f0ebcc58f27e65991b4
//被删除的master的ID
Source node #2:done //表示结束
... ...
Do you want to proceed with the proposed reshard plan (yes/no)? yes
//是否满意hash slot移动计划？
把要删除的master移除集群：
# redis-trib.rb del-node 192.168.2.100:6379 8326ff0be199fa0d4db74f0ebcc58f27e65991b4
//集群中任意节点的IP：端口、要删除的master的ID
更改slave节点隶属的master：
当前配置中，192.168.2.100:6380隶属于192.168.2.200:6379
将192.168.2.100:6380的隶属更改为192.168.2.100:6379
1、登录方式指定要更改隶属关系的IP、端口
2、更改隶属关系时，直接指定新的master节点的ID
# redis-cli -c -h 192.168.2.100 -p 6380
> cluster nodes
5844b4272c39456b0fdf73e384ff8c479547de47 192.168.2.200:6379 master - 0 1527165062499 3connected 5795-10922
2faf68564a70372cfc06c1afff197019cc6a39f3 192.168.2.201:6380 slave 3ff3a74f9dc41f8bc635ab845ad76bf77ffb0f69 0 1527165063511 6 connected
098e7eb756b6047fde988ab3c0b7189e1724ecf5 192.168.2.100:6379 master - 0 1527165060482 10 connected 0-5794 10923-11255
227f51028bbe827f27b4e40ed7a08fcc7d8df969 192.168.2.200:6380 slave 098e7eb756b6047fde988ab3c0b7189e1724ecf5 0 1527165059474 10 connected
7119dec91b086ca8fe69f7878fa42b1accd75f0f 192.168.2.100:6380 myself,slave 5844b4272c39456b0fdf73e384ff8c479547de47 0 0 2 connected
3ff3a74f9dc41f8bc635ab845ad76bf77ffb0f69 192.168.2.201:6379 master - 0 1527165058465 5 connected 11256-16383
192.168.2.100:6380>
192.168.2.100:6380> cluster replicate 098e7eb756b6047fde988ab3c0b7189e1724ecf5
OK
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