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"