第八章、Redis Cluster 集群模式
Redis Cluster 集群模式
Redis 的 Cluster 集群模式， 启动还挺简单，主要有两步
1、配置文件
2、启动验证
集群规划
根据官方推荐，集群部署至少要 3 台以上的master节点，最好使用 3 主 3 从六个节点的模式。
节点 服务器IP 配置文件 监听端口
cluster-master-1 192.168.3.71 /etc/redis/redis.conf 6379
cluster-master-2 192.168.3.72 /etc/redis/redis.conf 6379
cluster-master-3 192.168.3.73 /etc/redis/redis.conf 6379
cluster-slave-1 192.168.3.71 /etc/redis/redis6380.conf 6380
cluster-slave-2 192.168.3.72 /etc/redis/redis6380.conf 6380
cluster-slave-3 192.168.3.73 /etc/redis/redis6380.conf 6380
配置文件设置:
三台服务器创建一下数据存放目录：
mkdir -pv /redis/{6379,6380}
其中6379目录相当于主节点存放目录；6380目录相当于从节点存放目录
配置文件内容如下(记得复制6份并替换端口号和工作目录)
#94行左右 保护模式 protected-mode no #257行左右 后台运行 daemonize yes #290行左右 设置进程ID和日志位置，根据你启用的节点监听端口来命名保持一致 pidfile /var/run/redis_6380.pid logfile /var/log/redis/redis_6380.log #455行左右 修改工作目录，根据你启用的节点监听端口来命名保持一致 dir /redis/6380 # 900行左右设置认证密码（可选） requirepass longtao #1255行左右 启用AOF模式 appendonly yes #1380行开始，后面需要开启这三行参数 # 启用集群模式 cluster-enabled yes # 根据你启用的节点监听端口来命名保持一致，这个是用来保存其他节点的名称，状态等信息的 cluster-config-file nodes_6380.conf # 超时时间 cluster-node-timeout 5000
启动集群
先每台服务器上启动 redis 节点
redis-server redis6379.conf redis-server redis6380.conf
然后启动集群
# -a 后面跟着是认证密码，根据需要设置
# --cluster-replicas 1 命令的意思是创建master的时候同时创建一个slave
redis-cli -a longtao --cluster create 192.168.3.71:6379 192.168.3.72:6379 192.168.3.73:6379 192.168.3.71:6380 192.168.3.72:6380 192.168.3.73:6380 --cluster-replicas 1
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.3.72:6380 to 192.168.3.71:6379
Adding replica 192.168.3.73:6380 to 192.168.3.72:6379
Adding replica 192.168.3.71:6380 to 192.168.3.73:6379
M: 234bc8723b957d3d4a91677da0f64600a7761f7f 192.168.3.71:6379
slots:[0-5460] (5461 slots) master
M: 359adb45a35ba6ccc5a76ff303c2b2ed6a92345b 192.168.3.72:6379
slots:[5461-10922] (5462 slots) master
M: 8807ca47a84e1518b0cc61cb10f7df1cf826f104 192.168.3.73:6379
slots:[10923-16383] (5461 slots) master
S: 48fd8baec6d1776de52983d2546d62b83daea52f 192.168.3.71:6380
replicates 8807ca47a84e1518b0cc61cb10f7df1cf826f104
S: c42d808d7cbb389e5e9298a99e50aa261944c9b6 192.168.3.72:6380
replicates 234bc8723b957d3d4a91677da0f64600a7761f7f
S: 4f57540795a2d4648de0dc0d769fcba2ed30ffc3 192.168.3.73:6380
replicates 359adb45a35ba6ccc5a76ff303c2b2ed6a92345b
Can I set the above configuration? (type 'yes' to accept): yes
# 这里有个要手动输入 yes 确认的过程
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join
...
>>> Performing Cluster Check (using node 192.168.3.71:6379)
M: 234bc8723b957d3d4a91677da0f64600a7761f7f 192.168.3.71:6379
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 4f57540795a2d4648de0dc0d769fcba2ed30ffc3 127.0.0.1:6380
slots: (0 slots) slave
replicates 359adb45a35ba6ccc5a76ff303c2b2ed6a92345b
M: 8807ca47a84e1518b0cc61cb10f7df1cf826f104 192.168.3.73:6379
slots:[10923-16383] (5461 slots) master
S: 4f57540795a2d4648de0dc0d769fcba2ed30ffc3 192.168.3.73:6380
slots: (0 slots) slave
replicates 359adb45a35ba6ccc5a76ff303c2b2ed6a92345b
M: 359adb45a35ba6ccc5a76ff303c2b2ed6a92345b 192.168.3.72:6379
slots:[5461-10922] (5462 slots) master
2 additional replica(s)
S: c42d808d7cbb389e5e9298a99e50aa261944c9b6 192.168.3.72:6380
slots: (0 slots) slave
replicates 234bc8723b957d3d4a91677da0f64600a7761f7f
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
如图：
数据验证
# 注意 集群模式下要带参数 -c，表示集群，否则不能正常存取数据！！！
# 如果设置过认证密码需要登录时加入密码： -a longtao
# redis-cli -h 192.168.3.73 -p 6379 -a longtao -c
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
# 设置键值对
192.168.3.73:6379> set long tao
-> Redirected to slot [5598] located at 192.168.3.72:6379
OK
# 这可以看到集群的特点:把数据存到计算得出的 slot，这里还自动跳到了 192.168.3.72
192.168.3.72:6379> get long
"tao"
192.168.3.72:6379>
测试结果如图：
换成其他节点，也测试成功
[root@CentOS7 redis]# redis-cli -h 192.168.3.71 -p 6379 -a longtao -c
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.3.71:6379> get long
-> Redirected to slot [5598] located at 192.168.3.72:6379
"tao"
192.168.3.72:6379>
测试结果如图：
本文内容参考自 知乎，作者为 猴哥一一，原文网址：https://zhuanlan.zhihu.com/p/145186839