3主3从Redis集群配置

### redis集群搭建环境准备

```shell
        域名 : ip
主机1   test1:192.168.225.132
主机2   test2:192.168.225.130
主机3   test3:192.168.225.131
```

由于主机数量有限，一台linux都运行两台redis
```shell
主机1：192.168.225.132:6381   192.168.225.132:6382
主机2：192.168.225.130:6381   192.168.225.130:6382
主机3：192.168.225.131:6381   192.168.225.131:6382
```
简历集群的目录主要使用：/redis/cluster

### 新建6个独立的Redis实例服务

#### 新建目录

mkdir -p /redis/cluster

192.168.225.128 + 端口6381/6382

vim /redis/cluster/redisCluster6381.conf

#### 6381redis存放内容

```txt
daemonize yes
protected-mode no
port 6381
logfile "/redis/cluster/cluster6381.log"
pidfile /redis/cluster/cluster6381.pid
dir /redis/cluster/cluster
dbfilename dump6381.rdb
appendonly yes
appendfilename "appendonly6381.aof"
requirepass 123456
masterauth 123456

cluster-enabled yes
cluster-config-file nodes-6381.conf
cluster-node-timeout 5000
```
参数见参数说明

#### 6382redis存放内容
vim /redis/cluster/redisCluster6382.conf

```txt
daemonize yes
protected-mode no
port 6382
logfile "/redis/cluster/cluster6382.log"
pidfile /redis/cluster/cluster6382.pid
dir /redis/cluster
dbfilename dump6382.rdb
appendonly yes
appendfilename "appendonly6382.aof"
requirepass 123456
masterauth 123456

cluster-enabled yes
cluster-config-file nodes-6382.conf
cluster-node-timeout 5000
```
其他两台主机，拷贝redisCluster6382.conf和redisCluster6381.conf文件到/redis/cluster即可

### 启动redis

#### 启动6381 redis

redis-server /opt/redis/redisCluster6381.conf

#### 启动6382 redis

redis-server /opt/redis/redisCluster6382.conf
	
### 通过redis-cli 命令为6台机器构建集群关系

#### 构建主从关系命令

```shell
// 一定要注意，此处要修改自己的IP为真实IP
redis-cli -a 123456 --cluster create --cluster-replicas 1 192.168.225.132:6381 192.168.225.132:6382 192.168.225.130:6381 192.168.225.130:6382 192.168.225.131:6381 192.168.225.131:6382
```
--cluster- replicas 1 表示为每个master创建一一个slave节点

Can I set the above configuration? (type 'yes' to accept):输入yes

![启动redis集群](https://www.speechb.com/blog/redis/redis-cluster2.png "启动redis集群")

集群启动信息

![启动redis集群](https://www.speechb.com/blog/redis/redis-cluster1.png "启动redis集群")

出现All nodes agree about slots configuration.即成功搭建成功

### 检测集群状态

#### 连接集群
```shell
# -a 登录redis 密码  -p 端口
redis-cli -a 123456 -p 6381
```

#### info replication

```txt
127.0.0.1:6381> info replication
# Replication
role:master
connected_slaves:1
slave0:ip=192.168.225.130,port=6382,state=online,offset=108,lag=0
master_failover_state:no-failover
master_replid:18b19fc5524865b3bf69cabdd78a3e87394ba778
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:108
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:108
```
 	role:master: 标识当前redis为master
	
	connected_slaves:1: 当前连接了一台从机

slave0:ip=192.168.225.130,port=6382,state=online,offset=108,lag=0: 从节点信息，ip和端口

#### cluster nodes

```txt
5977667fbfa2b75d7015c067819d3283c51224f0 192.168.225.130:6381@16381 master - 0 1689215775000 3 connected 5461-10922
452f736b17490ec1f2e33afb574490c807fa913f 192.168.225.130:6382@16382 slave 84f534d712ab956fd5f51efef8a0e749fb775fc4 0 1689215776622 1 connected
84f534d712ab956fd5f51efef8a0e749fb775fc4 192.168.225.132:6381@16381 myself,master - 0 1689215775000 1 connected 0-5460
e1da6d5ca5c1c4ee50b78dc4405afbb6950905aa 192.168.225.131:6382@16382 slave 5977667fbfa2b75d7015c067819d3283c51224f0 0 1689215775614 3 connected
913d5c8d4d160cdbdfbb2918f2b9c2aef8736e78 192.168.225.131:6381@16381 master - 0 1689215776522 5 connected 10923-16383
c1f047c0d0e815ead05f997645a16684bc42f73e 192.168.225.132:6382@16382 slave 913d5c8d4d160cdbdfbb2918f2b9c2aef8736e78 0 1689215775000 5 connected
```
	0-5460 5461-10922 10923-16383 为槽位范围

#### CLUSTER INFO

```text
127.0.0.1:6381> CLUSTER INFO
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:562
cluster_stats_messages_pong_sent:563
cluster_stats_messages_sent:1125
cluster_stats_messages_ping_received:558
cluster_stats_messages_pong_received:562
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:1125
total_cluster_links_buffer_limit_exceeded:0
```

### 数据操作
#### 对6381新增连个key
127.0.0.1:6381> set k1 v1
(error) MOVED 12706 192.168.225.131:6381

出现报错，这是由于需要注意槽位范围，<span color='red'>路由到位</span>

如何解决

防止路由失效加参数-c并新增两个key：

redis-cli -a 123456 -p 6381 -c

成功
```text
127.0.0.1:6381> set k1 v1
-> Redirected to slot [12706] located at 192.168.225.131:6381
OK
```

查看某个key该属于对应的槽位值 cluster keyslot 键名称

```text
192.168.225.131:6381> cluster keyslot k1
(integer) 12706
```

### 集群配置参数说明

```config
# 设置后台开启
daemonize yes
# 是否启动保护模式，默认yes
protected-mode no
# redis端口
port 6381
# 日志文件
logfile "/myredis/cluster/cluster6381.log"
# pid存放未知
pidfile /myredis/cluster6381.pid
# 
dir /myredis/cluster
# rbd文件的文件名
dbfilename dump6381.rdb
# 打开aof持久化
appendonly yes
# aof文件名
appendfilename "appendonly6381.aof"
# redis密码
requirepass 123456
# master密码
masterauth 123456

#开启集群
cluster-enabled yes
# 集群的配置文件,该文件自动生成
cluster-config-file nodes-6381.conf
#设置集群的超时时间
cluster-node-timeout 5000
```