转自：https://www.cnblogs.com/blazeZzz/p/11007977.html

环境说明

单机redis

192.168.41.101:6379

redis集群

192.168.41.101:7000 master
192.168.41.101:7001 master
192.168.41.101:7002

192.168.41.102:7000 master
192.168.41.102:7001
192.168.41.102:7002

迁移步骤

查看集群状态及节点槽分布

[root@blaze bin]# ./redis-cli -c -p 7000
127.0.0.1:7000> cluster nodes
ab6d9f956de325cb4cf001abc31df365a5db5234 192.168.41.102:7001 slave 923c9ea13ec8fc19bed309dfbfad094320e1ca41 0 1560304528263 7 connected
48629733acbb8a580a39403dfac92845d63c97b3 192.168.41.101:7001 master - 0 1560304529768 2 connected 5461-10921
2cec8ac00f760c45d86f7903cefad85ec36704e7 192.168.41.102:7002 slave 923c9ea13ec8fc19bed309dfbfad094320e1ca41 0 1560304531271 7 connected
923c9ea13ec8fc19bed309dfbfad094320e1ca41 192.168.41.101:7000 myself,master - 0 0 7 connected 0-5460
e65b319e83997ed6f5323a26aaccba3f35522cbd 192.168.41.101:7002 slave 923c9ea13ec8fc19bed309dfbfad094320e1ca41 0 1560304532274 7 connected
5c0888d5bcceda2904311cbd5405596217c48105 192.168.41.102:7000 master - 0 1560304530268 4 connected 10922-16383

[root@blaze src]# ./redis-trib.rb check 192.168.41.101:7000
>>> Performing Cluster Check (using node 192.168.41.101:7000)
M: 923c9ea13ec8fc19bed309dfbfad094320e1ca41 192.168.41.101:7000
   slots:0-5460 (5461 slots) master
   3 additional replica(s)
S: ab6d9f956de325cb4cf001abc31df365a5db5234 192.168.41.102:7001
   slots: (0 slots) slave
   replicates 923c9ea13ec8fc19bed309dfbfad094320e1ca41
M: 48629733acbb8a580a39403dfac92845d63c97b3 192.168.41.101:7001
   slots:5461-10921 (5461 slots) master
   0 additional replica(s)
S: 2cec8ac00f760c45d86f7903cefad85ec36704e7 192.168.41.102:7002
   slots: (0 slots) slave
   replicates 923c9ea13ec8fc19bed309dfbfad094320e1ca41
S: e65b319e83997ed6f5323a26aaccba3f35522cbd 192.168.41.101:7002
   slots: (0 slots) slave
   replicates 923c9ea13ec8fc19bed309dfbfad094320e1ca41
M: 5c0888d5bcceda2904311cbd5405596217c48105 192.168.41.102:7000
   slots:10922-16383 (5462 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.

 

把101:7001和102:7000两个master的slots转移到101:7000上

./redis-trib.rb reshard --from 5c0888d5bcceda2904311cbd5405596217c48105 --to 923c9ea13ec8fc19bed309dfbfad094320e1ca41  --slots 5462 --yes 192.168.41.101:7000

./redis-trib.rb reshard --from 48629733acbb8a580a39403dfac92845d63c97b3 --to 923c9ea13ec8fc19bed309dfbfad094320e1ca41  --slots 5461 --yes 192.168.41.101:7000

 

查看转以后槽点分配

>>> Performing Cluster Check (using node 192.168.41.101:7000)
M: 923c9ea13ec8fc19bed309dfbfad094320e1ca41 192.168.41.101:7000
   slots:0-16383 (16384 slots) master
   3 additional replica(s)
S: ab6d9f956de325cb4cf001abc31df365a5db5234 192.168.41.102:7001
   slots: (0 slots) slave
   replicates 923c9ea13ec8fc19bed309dfbfad094320e1ca41
M: 48629733acbb8a580a39403dfac92845d63c97b3 192.168.41.101:7001
   slots: (0 slots) master
   0 additional replica(s)
S: 2cec8ac00f760c45d86f7903cefad85ec36704e7 192.168.41.102:7002
   slots: (0 slots) slave
   replicates 923c9ea13ec8fc19bed309dfbfad094320e1ca41
S: e65b319e83997ed6f5323a26aaccba3f35522cbd 192.168.41.101:7002
   slots: (0 slots) slave
   replicates 923c9ea13ec8fc19bed309dfbfad094320e1ca41
M: 5c0888d5bcceda2904311cbd5405596217c48105 192.168.41.102:7000
   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.

把192.168.41.101:6379的appendonly.aof 文件复制到101:7000的aof文件目录下

cp 6379目录/appendonly.aof   7000目录

重启101:7000节点加载aof文件

[root@blaze bin]# ./redis-cli -c -p 7000 shutdown

[root@blaze bin]# ./redis-server ../redis.conf 

查看数据是否正确

dbsize

 

将101:7000的槽 均匀分配给其他两个master节点

./redis-trib.rb reshard --from 923c9ea13ec8fc19bed309dfbfad094320e1ca41  --to 5c0888d5bcceda2904311cbd5405596217c48105  --slots 5462 --yes 192.168.41.101:7000

./redis-trib.rb reshard --from 923c9ea13ec8fc19bed309dfbfad094320e1ca41  --to 48629733acbb8a580a39403dfac92845d63c97b3  --slots 5461 --yes 192.168.41.101:7000

再次查看集群状态和槽分配。