Redis集群擴容的實現(xiàn)示例
更新時間：2025年02月27日 11:32:58 作者：元氣滿滿的熱碼式
本文介紹了在虛擬機上新建Redis集群,并將新增節(jié)點加入現(xiàn)有集群,通過配置文件和`redis-cli`命令,成功實現(xiàn)了Redis集群的擴容,感興趣的可以了解一下
在虛擬機上新建兩個6387，6388服務配置文件，新建之后啟動
[root@redis-cluster1 cluster]# cat redisCluster6387.conf bind 0.0.0.0 daemonize yes protected-mode no logfile "/myredis/cluster/cluster6387.log" pidfile /myredis/cluster6387.pid dir /myredis/cluster dbfilename dump6387.rdb appendonly yes appendfilename "appendonly6387.aof" requirepass 111111 masterauth 111111 port 6387 cluster-enabled yes cluster-config-file nodes-6387.conf cluster-node-timeout 5000 [root@redis-cluster1 cluster]# cat redisCluster6388.conf bind 0.0.0.0 daemonize yes protected-mode no logfile "/myredis/cluster/cluster6388.log" pidfile /myredis/cluster6388.pid dir /myredis/cluster dbfilename dump6388.rdb appendonly yes appendfilename "appendonly6388.aof" requirepass 111111 masterauth 111111 port 6388 cluster-enabled yes cluster-config-file nodes-6388.conf cluster-node-timeout 5000
啟動87，88兩個服務，此時他們都是master，沒有加入集群
[root@redis-cluster1 cluster]# redis-server redisCluster6387.conf [root@redis-cluster1 cluster]# redis-server redisCluster6388.conf [root@redis-cluster1 cluster]# ps -ef | grep redis root 2038 1 0 15:31 ? 00:00:31 redis-server 0.0.0.0:6386 [cluster] root 2221 1 0 15:47 ? 00:00:24 redis-server 0.0.0.0:6385 [cluster] root 2327 1753 0 16:01 pts/0 00:00:00 redis-cli -a 111111 -p 6385 root 2472 1 0 16:44 ? 00:00:00 redis-server 0.0.0.0:6387 [cluster] root 2479 1 0 16:44 ? 00:00:00 redis-server 0.0.0.0:6388 [cluster] root 2486 1954 0 16:44 pts/1 00:00:00 grep --color=auto redis [root@redis-cluster1 cluster]# redis-cli -a 111111 -p 6387 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:6387> 127.0.0.1:6387> 127.0.0.1:6387> cluster nodes 494e60980fac86000312e544f71c0e835bc1445b :6387@16387 myself,master - 0 0 0 connected 127.0.0.1:6387>
將新增的6387節(jié)點作為master加入原集群
將新增的6387作為master節(jié)點加入原有集群
redis-cli -a 密碼 --cluster add-node,自己實際IP地址:6387 自己實際IP地址:6381
6387 就是將要作為master新增節(jié)點
6381 就是原來集群節(jié)點里面的領(lǐng)路人，相當于6387拜拜6381的碼頭從而找到組織加入集群redis-cli -a 111111 --cluster add-node 192.168.111.174:6387 192.168.111.175:6381
[root@redis-cluster1 cluster]# redis-cli -a 111111 --cluster add-node 192.168.58.212:6387 192.168.58.129:6381 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. >>> Adding node 192.168.58.212:6387 to cluster 192.168.58.129:6381 >>> Performing Cluster Check (using node 192.168.58.129:6381) M: ba40235fdad71fb36c3bf165ea51055825d453c2 192.168.58.129:6381 slots:[0-5460] (5461 slots) master 1 additional replica(s) S: fedf4b13be2122f44dde749a08c4b943582b3566 192.168.58.129:6382 slots: (0 slots) slave replicates be191621d4aa881d864a113c385d58b751753392 S: 91cf395e8f04a5df1aeec4602dd38b3e4a708d55 192.168.58.130:6384 slots: (0 slots) slave replicates ba40235fdad71fb36c3bf165ea51055825d453c2 M: 0a820807a70885c1d87d141824d3869dcf2418ee 192.168.58.130:6383 slots:[5461-10922] (5462 slots) master 1 additional replica(s) M: be191621d4aa881d864a113c385d58b751753392 192.168.58.212:6385 slots:[10923-16383] (5461 slots) master 1 additional replica(s) S: 30e5bdec200a671e4de666551d4489f0035235ba 192.168.58.212:6386 slots: (0 slots) slave replicates 0a820807a70885c1d87d141824d3869dcf2418ee [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. >>> Getting functions from cluster >>> Send FUNCTION LIST to 192.168.58.212:6387 to verify there is no functions in it >>> Send FUNCTION RESTORE to 192.168.58.212:6387 >>> Send CLUSTER MEET to node 192.168.58.212:6387 to make it join the cluster. [OK] New node added correctly.
第一次檢查集群狀態(tài)：
6387還沒有被分配槽位
[root@redis-cluster1 cluster]# redis-cli -a 111111 --cluster check 192.168.58.129:6381 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.58.129:6381 (ba40235f...) -> 0 keys | 5461 slots | 1 slaves. 192.168.58.130:6383 (0a820807...) -> 0 keys | 5462 slots | 1 slaves. 192.168.58.212:6385 (be191621...) -> 0 keys | 5461 slots | 1 slaves. 192.168.58.212:6387 (494e6098...) -> 0 keys | 0 slots | 0 slaves. [OK] 0 keys in 4 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.58.129:6381) M: ba40235fdad71fb36c3bf165ea51055825d453c2 192.168.58.129:6381 slots:[0-5460] (5461 slots) master 1 additional replica(s) S: fedf4b13be2122f44dde749a08c4b943582b3566 192.168.58.129:6382 slots: (0 slots) slave replicates be191621d4aa881d864a113c385d58b751753392 S: 91cf395e8f04a5df1aeec4602dd38b3e4a708d55 192.168.58.130:6384 slots: (0 slots) slave replicates ba40235fdad71fb36c3bf165ea51055825d453c2 M: 0a820807a70885c1d87d141824d3869dcf2418ee 192.168.58.130:6383 slots:[5461-10922] (5462 slots) master 1 additional replica(s) M: be191621d4aa881d864a113c385d58b751753392 192.168.58.212:6385 slots:[10923-16383] (5461 slots) master 1 additional replica(s) S: 30e5bdec200a671e4de666551d4489f0035235ba 192.168.58.212:6386 slots: (0 slots) slave replicates 0a820807a70885c1d87d141824d3869dcf2418ee M: 494e60980fac86000312e544f71c0e835bc1445b 192.168.58.212:6387 slots: (0 slots) master [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
重新分配槽號
16384處于4，因為現(xiàn)在有四個主機；
填寫6387的id號；
[root@redis-cluster1 cluster]# redis-cli -a 111111 --cluster reshard 192.168.58.129:6381
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Performing Cluster Check (using node 192.168.58.129:6381)
M: ba40235fdad71fb36c3bf165ea51055825d453c2 192.168.58.129:6381
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: fedf4b13be2122f44dde749a08c4b943582b3566 192.168.58.129:6382
slots: (0 slots) slave
replicates be191621d4aa881d864a113c385d58b751753392
S: 91cf395e8f04a5df1aeec4602dd38b3e4a708d55 192.168.58.130:6384
slots: (0 slots) slave
replicates ba40235fdad71fb36c3bf165ea51055825d453c2
M: 0a820807a70885c1d87d141824d3869dcf2418ee 192.168.58.130:6383
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
M: be191621d4aa881d864a113c385d58b751753392 192.168.58.212:6385
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: 30e5bdec200a671e4de666551d4489f0035235ba 192.168.58.212:6386
slots: (0 slots) slave
replicates 0a820807a70885c1d87d141824d3869dcf2418ee
M: 494e60980fac86000312e544f71c0e835bc1445b 192.168.58.212:6387
slots: (0 slots) master
[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)? 4096
What is the receiving node ID? 494e60980fac86000312e544f71c0e835bc1445b
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 4096 slots.
Source nodes:
M: ba40235fdad71fb36c3bf165ea51055825d453c2 192.168.58.129:6381
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 0a820807a70885c1d87d141824d3869dcf2418ee 192.168.58.130:6383
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
M: be191621d4aa881d864a113c385d58b751753392 192.168.58.212:6385
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
Destination node:
M: 494e60980fac86000312e544f71c0e835bc1445b 192.168.58.212:6387
slots: (0 slots) master
Resharding plan:
再次查看集群狀態(tài)
四個主節(jié)點均已被分配槽位；
當前狀態(tài)為三主三從，一主零從
[root@redis-cluster1 cluster]# redis-cli -a 111111 --cluster check 192.168.58.129:6381 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.58.129:6381 (ba40235f...) -> 0 keys | 4096 slots | 1 slaves. 192.168.58.130:6383 (0a820807...) -> 0 keys | 4096 slots | 1 slaves. 192.168.58.212:6385 (be191621...) -> 0 keys | 4096 slots | 1 slaves. 192.168.58.212:6387 (494e6098...) -> 0 keys | 4096 slots | 0 slaves. [OK] 0 keys in 4 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.58.129:6381) M: ba40235fdad71fb36c3bf165ea51055825d453c2 192.168.58.129:6381 slots:[1365-5460] (4096 slots) master 1 additional replica(s) S: fedf4b13be2122f44dde749a08c4b943582b3566 192.168.58.129:6382 slots: (0 slots) slave replicates be191621d4aa881d864a113c385d58b751753392 S: 91cf395e8f04a5df1aeec4602dd38b3e4a708d55 192.168.58.130:6384 slots: (0 slots) slave replicates ba40235fdad71fb36c3bf165ea51055825d453c2 M: 0a820807a70885c1d87d141824d3869dcf2418ee 192.168.58.130:6383 slots:[6827-10922] (4096 slots) master 1 additional replica(s) M: be191621d4aa881d864a113c385d58b751753392 192.168.58.212:6385 slots:[12288-16383] (4096 slots) master 1 additional replica(s) S: 30e5bdec200a671e4de666551d4489f0035235ba 192.168.58.212:6386 slots: (0 slots) slave replicates 0a820807a70885c1d87d141824d3869dcf2418ee M: 494e60980fac86000312e544f71c0e835bc1445b 192.168.58.212:6387 slots:[0-1364],[5461-6826],[10923-12287] (4096 slots) master [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
為主節(jié)點87分配從節(jié)點88
[root@redis-cluster1 cluster]# redis-cli -a 111111 --cluster add-node 192.168.58.212:6388 192.168.58.212:6387 --cluster-slave --cluster-master-id 494e60980fac86000312e544f71c0e835bc1445b
--cluster-master-id 494e60980fac86000312e544f71c0e835bc1445b ：主節(jié)點id號
再次查看當前的集群狀態(tài)：
127.0.0.1:6385> cluster nodes 0a820807a70885c1d87d141824d3869dcf2418ee 192.168.58.130:6383@16383 master - 0 1733303488000 3 connected 6827-10922 91cf395e8f04a5df1aeec4602dd38b3e4a708d55 192.168.58.130:6384@16384 slave ba40235fdad71fb36c3bf165ea51055825d453c2 0 1733303487073 1 connected be191621d4aa881d864a113c385d58b751753392 192.168.58.212:6385@16385 myself,master - 0 0 8 connected 12288-16383 30e5bdec200a671e4de666551d4489f0035235ba 192.168.58.212:6386@16386 slave 0a820807a70885c1d87d141824d3869dcf2418ee 0 1733303488559 3 connected ba40235fdad71fb36c3bf165ea51055825d453c2 192.168.58.129:6381@16381 master - 0 1733303488000 1 connected 1365-5460 c26c4f5ec9882083544326df9249fa48e35c6a2a 192.168.58.212:6388@16388 slave 494e60980fac86000312e544f71c0e835bc1445b 0 1733303488345 9 connected 494e60980fac86000312e544f71c0e835bc1445b 192.168.58.212:6387@16387 master - 0 1733303488675 9 connected 0-1364 5461-6826 10923-12287 fedf4b13be2122f44dde749a08c4b943582b3566 192.168.58.129:6382@16382 slave be191621d4aa881d864a113c385d58b751753392 0 1733303488106 8 connected 127.0.0.1:6385>
四主四從，集群擴容完成！
[root@redis-cluster1 cluster]# redis-cli -a 111111 --cluster check 192.168.58.129:6381 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.58.129:6381 (ba40235f...) -> 0 keys | 4096 slots | 1 slaves. 192.168.58.212:6387 (494e6098...) -> 0 keys | 4096 slots | 1 slaves. 192.168.58.130:6383 (0a820807...) -> 0 keys | 4096 slots | 1 slaves. 192.168.58.212:6385 (be191621...) -> 0 keys | 4096 slots | 1 slaves. [OK] 0 keys in 4 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.58.129:6381) M: ba40235fdad71fb36c3bf165ea51055825d453c2 192.168.58.129:6381 slots:[1365-5460] (4096 slots) master 1 additional replica(s) S: 30e5bdec200a671e4de666551d4489f0035235ba 192.168.58.212:6386 slots: (0 slots) slave replicates 0a820807a70885c1d87d141824d3869dcf2418ee M: 494e60980fac86000312e544f71c0e835bc1445b 192.168.58.212:6387 slots:[0-1364],[5461-6826],[10923-12287] (4096 slots) master 1 additional replica(s) S: fedf4b13be2122f44dde749a08c4b943582b3566 192.168.58.129:6382 slots: (0 slots) slave replicates be191621d4aa881d864a113c385d58b751753392 M: 0a820807a70885c1d87d141824d3869dcf2418ee 192.168.58.130:6383 slots:[6827-10922] (4096 slots) master 1 additional replica(s) S: 91cf395e8f04a5df1aeec4602dd38b3e4a708d55 192.168.58.130:6384 slots: (0 slots) slave replicates ba40235fdad71fb36c3bf165ea51055825d453c2 M: be191621d4aa881d864a113c385d58b751753392 192.168.58.212:6385 slots:[12288-16383] (4096 slots) master 1 additional replica(s) S: c26c4f5ec9882083544326df9249fa48e35c6a2a 192.168.58.212:6388 slots: (0 slots) slave replicates 494e60980fac86000312e544f71c0e835bc1445b [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
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