Redis集群模式搭建

Redis主要有三种集群方案:

1. 主从模式
2. 哨兵模式
3. 集群模式

集群模式搭建

Redis3.0版本之后才可用，推荐3主3从集群模式。

1. 启动6台Redis

配置文件如下 ，redis_7002.conf...类似修改

# redis_7001.conf
# 端口
port 7001
# 启用集群模式
cluster-enabled yes
# 集群节点信息配置
cluster-config-file nodes_7001.conf
# 超时时间
cluster-node-timeout 5000
appendonly yes
# 后台运行
daemonize yes
# 非保护模式
protected-mode no
pidfile  /var/run/redis_7001.pid

启动redis

./redis-server redis_7001.conf

启动后查看进程

# ps -ef | grep redis
redis   19196     1  0 10:52 ?        00:00:00 redis-server *:7001 [cluster]
redis   19336     1  0 10:58 ?        00:00:00 redis-server *:7002 [cluster]
redis   19341     1  0 10:58 ?        00:00:00 redis-server *:7003 [cluster]
redis   19346     1  0 10:58 ?        00:00:00 redis-server *:7004 [cluster]
redis   19351     1  0 10:58 ?        00:00:00 redis-server *:7005 [cluster]
redis   19356     1  0 10:58 ?        00:00:00 redis-server *:7006 [cluster]

2. 建立通信

# 建立通信
redis-cli -p 7001 cluster meet 127.0.0.1 7002
redis-cli -p 7001 cluster meet 127.0.0.1 7003
redis-cli -p 7001 cluster meet 127.0.0.1 7004
redis-cli -p 7001 cluster meet 127.0.0.1 7005
redis-cli -p 7001 cluster meet 127.0.0.1 7006
# 查看集群状态
# redis-cli -p 7001 cluster nodes
37d5fc8893126bea6895c694bd58448c89850354 127.0.0.1:7002@17002 master - 0 1661339366084 1 connected
16ceb3377a22dd6131b82d3da2f00bf1bea9a450 127.0.0.1:7006@17006 master - 0 1661339364075 5 connected
c2f26926df0a0e1b41c5d762a50e2255cea04611 127.0.0.1:7001@17001 myself,master - 0 1661339365000 0 connected
468020945e3ae2bbe96f19d19766354700cdee59 127.0.0.1:7004@17004 master - 0 1661339366000 4 connected
6bf6034bd4106d423d12d2123d254dc9c87d0481 127.0.0.1:7005@17005 master - 0 1661339364577 3 connected
1738af4b9fbff887dc74fa8acf56084c89de9496 127.0.0.1:7003@17003 master - 0 1661339365079 2 connected

3. 分配槽位

# 查看集群状态
# redis-cli -p 7001 cluster info
cluster_state:fail
cluster_slots_assigned:0
cluster_slots_ok:0
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
# 分配槽位
redis-cli -p 7001 cluster addslots {0..5460}
redis-cli -p 7001 cluster addslots {5461..10922}
redis-cli -p 7001 cluster addslots {10923..16383}
# 查看集群状态
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6

4. 确定主从

# NodeID可以通过cluster nodes命令查看
redis-cli -p 7004 cluster replicate c2f26926df0a0e1b41c5d762a50e2255cea04611
redis-cli -p 7005 cluster replicate 37d5fc8893126bea6895c694bd58448c89850354
redis-cli -p 7006 cluster replicate 1738af4b9fbff887dc74fa8acf56084c89de9496
# 查看集群状态
# redis-cli -p 7001 cluster nodes
37d5fc8893126bea6895c694bd58448c89850354 127.0.0.1:7002@17002 master - 0 1661340450922 1 connected
16ceb3377a22dd6131b82d3da2f00bf1bea9a450 127.0.0.1:7006@17006 slave 1738af4b9fbff887dc74fa8acf56084c89de9496 0 1661340449000 5 connected
c2f26926df0a0e1b41c5d762a50e2255cea04611 127.0.0.1:7001@17001 myself,master - 0 1661340449000 0 connected 0-16383
468020945e3ae2bbe96f19d19766354700cdee59 127.0.0.1:7004@17004 slave c2f26926df0a0e1b41c5d762a50e2255cea04611 0 1661340450520 4 connected
6bf6034bd4106d423d12d2123d254dc9c87d0481 127.0.0.1:7005@17005 slave 37d5fc8893126bea6895c694bd58448c89850354 0 1661340450420 3 connected
1738af4b9fbff887dc74fa8acf56084c89de9496 127.0.0.1:7003@17003 master - 0 1661340449415 2 connected

参考资料：
https://redis.io/docs/manual/scaling/