Redis集群部署（Redis集群部署脚本）

经历了redis5.x之前（redis3.x或redis4.x）集群部署过程中ruby版本及各种依赖包蹂躏后，再感受一下redis5.x之后集群部署的便捷。

Redis5之前版本部署步骤

1、安装redis集群节点

因本次为伪分布式部署，生产环境部署时建议至少3台机器部署（其中每台机器1主1从），依旧和redis4.0.14的方式一样部署

1.1 启动cluster各节点

创建数据目录

mkdir -p  /data/redis/cluster/{7000,7001,7002,7003,7004,7005}

配置文件中主要修改如下内容，其他的可按需调整，也可保持默认值，各节点中注意修改对应的端口号

bind 192.168.56.103
port 7000
daemonize yes
pidfile /data/redis/cluster/7000/redis_7000.pid
logfile "/data/redis/cluster/7000/redis_7000.log"
appendonly yes
appendfilename "appendonly.aof"
appendfsync everysec
cluster-enabled yes
cluster-config-file nodes-7000.conf     #注意此文件自动生成，且初始化时不要有和此重名的文件
cluster-node-timeout 5000
cluster-slave-validity-factor 10
cluster-migration-barrier 1
cluster-require-full-coverage yes
cluster-slave-no-failover no

启动各节点，建议用redis用户启动

useradd redis
chown -R  redis:redis  /data/redis/
su - redis
cd /data/redis/cluster/7001
cp /data/redis/cluster/7000/redis.conf . 
sed -i "s#7000#7001#g" redis.conf
redis-server redis.conf

其他节点和7001类似启动，启动后进程中会标记redis节点以cluster模式启动

2. 初始化集群

redis5.x之后的版本初始化集群相当便捷，命令及过程如下

redis-cli --cluster create --cluster-replicas 1 192.168.56.103:7000 192.168.56.103:7001 192.168.56.103:7002 192.168.56.103:7003 192.168.56.103:7004 192.168.56.103:7005
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.56.103:7004 to 192.168.56.103:7000
Adding replica 192.168.56.103:7005 to 192.168.56.103:7001
Adding replica 192.168.56.103:7003 to 192.168.56.103:7002
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: 84ea774c08450db01bf5a518e3b9e55fd26d4d34 192.168.56.103:7000
   slots:[0-5460] (5461 slots) master
M: eb98e53273fd348deb5eabcc6bfffc20484749b1 192.168.56.103:7001
   slots:[5461-10922] (5462 slots) master
M: e059d418c11401189558d0f33bd5658297c10939 192.168.56.103:7002
   slots:[10923-16383] (5461 slots) master
S: 23eed1c27ad11c685e5a226e2f82d5c0b6384c79 192.168.56.103:7003
   replicates e059d418c11401189558d0f33bd5658297c10939
S: cfa2549ea7782bb4f0ed6d45e9e3704a7d38d540 192.168.56.103:7004
   replicates 84ea774c08450db01bf5a518e3b9e55fd26d4d34
S: c3e14c4139bfa88af03ea97679715f051a122806 192.168.56.103:7005
   replicates eb98e53273fd348deb5eabcc6bfffc20484749b1
Can I set the above configuration? (type 'yes' to accept): yes
>>> 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 192.168.56.103:7000)
M: 84ea774c08450db01bf5a518e3b9e55fd26d4d34 192.168.56.103:7000
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
S: 23eed1c27ad11c685e5a226e2f82d5c0b6384c79 192.168.56.103:7003
   slots: (0 slots) slave
   replicates e059d418c11401189558d0f33bd5658297c10939
M: eb98e53273fd348deb5eabcc6bfffc20484749b1 192.168.56.103:7001
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
S: c3e14c4139bfa88af03ea97679715f051a122806 192.168.56.103:7005
   slots: (0 slots) slave
   replicates eb98e53273fd348deb5eabcc6bfffc20484749b1
S: cfa2549ea7782bb4f0ed6d45e9e3704a7d38d540 192.168.56.103:7004
   slots: (0 slots) slave
   replicates 84ea774c08450db01bf5a518e3b9e55fd26d4d34
M: e059d418c11401189558d0f33bd5658297c10939 192.168.56.103:7002
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

看到如下结果，代表成功配置并分配slot完成

查看各节点信息也可以用如下命令

[redis@localhost 7005]$ redis-cli -h 192.168.56.103 -p 7000 cluster nodes
23eed1c27ad11c685e5a226e2f82d5c0b6384c79 192.168.56.103:7003@17003 slave e059d418c11401189558d0f33bd5658297c10939 0 1646118171000 4 connected
eb98e53273fd348deb5eabcc6bfffc20484749b1 192.168.56.103:7001@17001 master - 0 1646118171604 2 connected 5461-10922
c3e14c4139bfa88af03ea97679715f051a122806 192.168.56.103:7005@17005 slave eb98e53273fd348deb5eabcc6bfffc20484749b1 0 1646118171000 6 connected
cfa2549ea7782bb4f0ed6d45e9e3704a7d38d540 192.168.56.103:7004@17004 slave 84ea774c08450db01bf5a518e3b9e55fd26d4d34 0 1646118170000 5 connected
e059d418c11401189558d0f33bd5658297c10939 192.168.56.103:7002@17002 master - 0 1646118169590 3 connected 10923-16383
84ea774c08450db01bf5a518e3b9e55fd26d4d34 192.168.56.103:7000@17000 myself,master - 0 1646118171000 1 connected 0-5460