部署redis-cluster

1、环境准备

☆ 每个Redis 节点采用相同的相同的Redis版本、相同的密码、硬件配置

☆ 所有Redis服务器必须没有任何数据

#所有主从节点执行：
 [root@ubuntu2004 ~]#bash install_redis.sh     
 #脚本参考：https://blog.51cto.com/dayu/5805274

2、启用 redis cluster 配置

#所有主从节点执行：
 #每个节点修改redis配置，必须开启cluster功能的参数
 
 [root@master-1 ~]#vim /apps/redis/etc/redis.conf
 bind 0.0.0.0
 masterauth 123456       #建议配置，否则后期的master和slave主从复制无法成功，还需再配置
 requirepass 123456
 cluster-enabled yes     #取消此行注释,必须开启集群，开启后 redis 进程会有cluster标识
 cluster-config-file nodes-6379.conf     #取消此行注释,此为集群状态数据文件,记录主从关系及slot范围信息,由redis cluster 集群自动创建和维护
 cluster-require-full-coverage no        #默认值为yes,设为no可以防止一个节点不可用导致整个cluster不可用

#验证当前Redis服务状态：
 [root@master-1 ~]#ss -ntl
 State      Recv-Q     Send-Q          Local Address:Port            Peer Address:Port     Process     
 LISTEN     0          511                   0.0.0.0:6379                 0.0.0.0:*                    
 LISTEN     0          4096            127.0.0.53%lo:53                   0.0.0.0:*                   
 LISTEN     0          128                   0.0.0.0:22                   0.0.0.0:*                   
 LISTEN     0          511                   0.0.0.0:16379                0.0.0.0:*                   
 LISTEN     0          511                     [::1]:6379                    [::]:*                   
 LISTEN     0          128                      [::]:22                      [::]:*                   
 LISTEN     0          511                     [::1]:16379                   [::]:*   
 
 #开启了16379的cluster的端口,实际的端口=redis port + 10000

3、创建集群

#10.0.0.101:
 [root@master-1 ~]#redis-cli -a 123456 --cluster create 10.0.0.101:6379 10.0.0.102:6379 10.0.0.103:6379 10.0.0.18:6379 10.0.0.28:6379 10.0.0.38:6379 --cluster-replicas 1
 #命令redis-cli的选项 --cluster-replicas 1 表示每个master对应一个slave节点

4、验证集群

#查看主从状态
 [root@master-1 ~]#redis-cli -a 123456 -c info replication
 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
 # Replication
 role:master
 connected_slaves:1
 slave0:ip=10.0.0.28,port=6379,state=online,offset=602,lag=0
 ......
 
 #查看对应关系
 [root@master-1 ~]#redis-cli -a 123456 cluster nodes
 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
 c58b6d30550a3d6d682d2a4f7563efabf470bd82 10.0.0.38:6379@16379 slave 139317befd252551e1135b27d32ce557133ec71a 0 1667098745948 2 connected
 ......
 
 #验证集群状态
 [root@master-1 ~]#redis-cli -a 123456 cluster info
 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
 cluster_state:ok
 cluster_slots_assigned:16384
 cluster_slots_ok:16384
 cluster_slots_pfail:0
 cluster_slots_fail:0
 cluster_known_nodes:6         #节点数
 cluster_size:3                #三个集群
 ......
 
 #查看任意节点的集群状态
 [root@slave-1 ~]#redis-cli -a 123456 --cluster info 10.0.0.38:6379
 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
 10.0.0.102:6379 (139317be...) -> 0 keys | 5462 slots | 1 slaves.
 10.0.0.101:6379 (98df8874...) -> 0 keys | 5461 slots | 1 slaves.
 10.0.0.103:6379 (8d72bbb5...) -> 0 keys | 5461 slots | 1 slaves.
 [OK] 0 keys in 3 masters.
 0.00 keys per slot on average.
 
 [root@slave-1 ~]#redis-cli -a 123456 --cluster check 10.0.0.38:6379

5、测试写入数据

[root@master-1 ~]#redis-cli -a 123456 -h 10.0.0.102 set k1 wang
 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
 (error) MOVED 12706 10.0.0.103:6379             #槽位不在当前node所以无法写入
 
 [root@master-1 ~]#redis-cli -a 123456 -h 10.0.0.103 set k1 wang
 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
 OK
 
 [root@slave-1 ~]#redis-cli -a 123456 -h 10.0.0.103 get k1
 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
 "wang"
 [root@master-1 ~]#redis-cli -a 123456 -h 10.0.0.103 get k1
 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
 "wang"
 
 #使用选项-c 以集群模式连接
 [root@master-1 ~]#redis-cli -c -h 10.0.0.18 -a 123456 --no-auth-warning
 10.0.0.18:6379> cluster keyslot test
 (integer) 6918
 10.0.0.18:6379> set test mylove
 -> Redirected to slot [6918] located at 10.0.0.102:6379
 OK
 10.0.0.102:6379> get test
 "mylove"
 10.0.0.102:6379> exit
 [root@master-1 ~]#redis-cli -h 10.0.0.102 -a 123456 --no-auth-warning get test
 "mylove"