[docker]redis-cluster的使用
Posted 蟒城贝勒爷
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1、为集群添加一个主节点
首先准备一个全新的redis文件夹，这里我们叫做为7007
[[email protected] redis-cluster]# ls 7001 7002 7003 7004 7005 7006 7007
[[email protected] redis-cluster]# tree 7007 7007 ├── redis-benchmark ├── redis-check-aof ├── redis-check-dump ├── redis-cli ├── redis.conf ├── redis-sentinel └── redis-server
启动7007的redis，然后添加7007的节点
[[email protected] ~]# cd /usr/local/redis-cluster/7007
[[email protected] 7007]# ./redis-server redis.conf
[[email protected] redis-cluster]# ./redis-trib.rb add-node 192.168.133.159:7007 192.168.133.159:7001
这个时候在集群里其实已经可以但看7007的节点了
[[email protected] 7001]# ./redis-cli -h 192.168.133.159 -p 7001 192.168.133.159:7001> CLUSTER nodes 50e36c10b731d536fcf35d0478b20c6671ed3116 192.168.133.159:7004 slave ee1d1cfbd7385893ababb0342329a55644734f4c 0 1535362869157 4 connected b40a94dee3200f716e8f628060348296b37952d1 192.168.133.159:7003 master - 0 1535362870164 3 connected 10923-16383 93d1ef27a47b5e830e2f1fdce9bdaeac6ce7689d 192.168.133.159:7006 slave b40a94dee3200f716e8f628060348296b37952d1 0 1535362865134 6 connected ee1d1cfbd7385893ababb0342329a55644734f4c 192.168.133.159:7001 myself,master - 0 0 1 connected 0-5460 8ca1250d01509febbedc14748069ea130fdf2b76 192.168.133.159:7007 master - 0 1535362868150 0 connected 4e1ca9e4d966776c0ec1c37ab12e90315baef857 192.168.133.159:7005 slave dd05edc6f7544f502c666d9b416a4063987bdbe9 0 1535362871170 5 connected dd05edc6f7544f502c666d9b416a4063987bdbe9 192.168.133.159:7002 master - 0 1535362870667 2 connected 5461-10922
但它还没有生效，因为redis的集群是对“槽“的操作，所以对于新加的节点，需要进行”槽“的再分配
[[email protected] redis-cluster]# ./redis-trib.rb reshard 192.168.133.159:7001
比如我们这里先分配1000个槽
How many slots do you want to move (from 1 to 16384)? 1000
然后输入接收点的ID
What is the receiving node ID? 8ca1250d01509febbedc14748069ea130fdf2b76
这个ID其实是通过cluster nodes的redis命令进行但看到的
最后输入源结点id
输入源结点id，槽将从源结点中拿，分配后的槽在源结点中就不存在了。
输入all表示从所有源结点中获取槽。
输入done取消分配。
Source node #1:all
以下就日志信息
Ready to move 1000 slots. Source nodes: M: ee1d1cfbd7385893ababb0342329a55644734f4c 192.168.133.159:7001 slots:0-5460 (5461 slots) master 1 additional replica(s) M: b40a94dee3200f716e8f628060348296b37952d1 192.168.133.159:7003 slots:10923-16383 (5461 slots) master 1 additional replica(s) M: dd05edc6f7544f502c666d9b416a4063987bdbe9 192.168.133.159:7002 slots:5461-10922 (5462 slots) master 1 additional replica(s) Destination node: M: 8ca1250d01509febbedc14748069ea130fdf2b76 192.168.133.159:7007 slots: (0 slots) master 0 additional replica(s) Resharding plan: Moving slot 5461 from dd05edc6f7544f502c666d9b416a4063987bdbe9 。。。
2、为集群添加一个从节点，用它来做为7007的从节点
创建一个7008的目录，然后启动7008的进程，然后添加从节点
[[email protected] 7008]# cd ../redis-trib.rb add-node --slave --master-id 8ca1250d01509febbedc14748069ea130fdf2b76 192.168.133.159:7008 192.168.133.159:7001
这样就完成了从节点的添加
192.168.133.159:7001> CLUSTER nodes 912b8dd1c7f35866ac15b263248ee729af7171e3 192.168.133.159:7008 slave 8ca1250d01509febbedc14748069ea130fdf2b76 0 1535368329746 7 connected 50e36c10b731d536fcf35d0478b20c6671ed3116 192.168.133.159:7004 slave ee1d1cfbd7385893ababb0342329a55644734f4c 0 1535368331758 4 connected b40a94dee3200f716e8f628060348296b37952d1 192.168.133.159:7003 master - 0 1535368328237 3 connected 11256-16383 93d1ef27a47b5e830e2f1fdce9bdaeac6ce7689d 192.168.133.159:7006 slave b40a94dee3200f716e8f628060348296b37952d1 0 1535368327735 6 connected ee1d1cfbd7385893ababb0342329a55644734f4c 192.168.133.159:7001 myself,master - 0 0 1 connected 333-5460 8ca1250d01509febbedc14748069ea130fdf2b76 192.168.133.159:7007 master - 0 1535368330752 7 connected 0-332 5461-5794 10923-11255 4e1ca9e4d966776c0ec1c37ab12e90315baef857 192.168.133.159:7005 slave dd05edc6f7544f502c666d9b416a4063987bdbe9 0 1535368326728 5 connected dd05edc6f7544f502c666d9b416a4063987bdbe9 192.168.133.159:7002 master - 0 1535368328742 2 connected 5795-10922
如果需要删除一个主节点
[[email protected] redis-cluster]# ./redis-trib.rb del-node 192.168.133.159:7007 8ca1250d01509febbedc14748069ea130fdf2b76 >>> Removing node 8ca1250d01509febbedc14748069ea130fdf2b76 from cluster 192.168.133.159:7007 [ERR] Node 192.168.133.159:7007 is not empty! Reshard data away and try again.
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