【Redis集群】docker实现3主3从扩缩容架构配置案例

一，集群规划及准备工作

架构实现：Redis3主3从

二，搭建命令

第一步，创建6台服务：

docker run -d --name redis-node-1 --net host --privileged=true -v /data/redis/share/redis-node-1:/data redis:6.0.8 --cluster-enabled yes --appendonly yes --port 6381

docker run -d --name redis-node-2 --net host --privileged=true -v /data/redis/share/redis-node-2:/data redis:6.0.8 --cluster-enabled yes --appendonly yes --port 6382

docker run -d --name redis-node-3 --net host --privileged=true -v /data/redis/share/redis-node-3:/data redis:6.0.8 --cluster-enabled yes --appendonly yes --port 6383

docker run -d --name redis-node-4 --net host --privileged=true -v /data/redis/share/redis-node-4:/data redis:6.0.8 --cluster-enabled yes --appendonly yes --port 6384

docker run -d --name redis-node-5 --net host --privileged=true -v /data/redis/share/redis-node-5:/data redis:6.0.8 --cluster-enabled yes --appendonly yes --port 6385

docker run -d --name redis-node-6 --net host --privileged=true -v /data/redis/share/redis-node-6:/data redis:6.0.8 --cluster-enabled yes --appendonly yes --port 6386

参数说明：
--cluster-enabled yes: 是否开启集群
--privileged=true：获取宿主机root用户权限
--net host：使用宿主机的端口和ip，默认
--appendonly yes：开启持久化

查看是否启动创建成功：

[root@localhost ~]# docker ps
CONTAINER ID   IMAGE         COMMAND                  CREATED         STATUS         PORTS     NAMES
528b29c8330b   redis:6.0.8   "docker-entrypoint.s…"   5 seconds ago   Up 5 seconds             redis-node-6
fd9184cd6761   redis:6.0.8   "docker-entrypoint.s…"   7 seconds ago   Up 7 seconds             redis-node-5
44397301e3ac   redis:6.0.8   "docker-entrypoint.s…"   7 seconds ago   Up 7 seconds             redis-node-4
18720ac44b13   redis:6.0.8   "docker-entrypoint.s…"   8 seconds ago   Up 7 seconds             redis-node-3
2b2987704c6d   redis:6.0.8   "docker-entrypoint.s…"   8 seconds ago   Up 8 seconds             redis-node-2
e2304c8acbd6   redis:6.0.8   "docker-entrypoint.s…"   9 seconds ago   Up 8 seconds             redis-node-1

第二步：进入容器redis-node-1并为6台机器构建集群关系

# 进入任何台都行（以redis-node-1为例）
docker exec -it redis-node-1 /bin/bash

# 构建主从关系
redis-cli --cluster create 12.114.161.16:6381 12.114.161.16:6382 12.114.161.16:6383 12.114.161.16:6384 12.114.161.16:6385 12.114.161.16:6386 --cluster-replicas 1

--cluster-replicas 1：为每个Master创建一个slave节点

>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 12.114.161.16:6385 to 12.114.161.16:6381
Adding replica 12.114.161.16:6386 to 12.114.161.16:6382
Adding replica 12.114.161.16:6384 to 12.114.161.16:6383
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: 6e961a4765b555189708bebb69badf7dfad25cd5 12.114.161.16:6381
   slots:[0-5460] (5461 slots) master
M: f097fec937f54d147d316c1c62e26cb67c9fd059 12.114.161.16:6382
   slots:[5461-10922] (5462 slots) master
M: 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2 12.114.161.16:6383
   slots:[10923-16383] (5461 slots) master
S: 0e34147ce2544cd90f5cce78d5493ae9e8625dfe 12.114.161.16:6384
   replicates f097fec937f54d147d316c1c62e26cb67c9fd059
S: 9bc2417a9cd6545ef2445eb4aa0610d586acd73b 12.114.161.16:6385
   replicates 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2
S: 4ed46e0368698cd9d5af2ee84631c878b8ebc4d0 12.114.161.16:6386
   replicates 6e961a4765b555189708bebb69badf7dfad25cd5
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 12.114.161.16:6381)
M: 6e961a4765b555189708bebb69badf7dfad25cd5 12.114.161.16:6381
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
S: 4ed46e0368698cd9d5af2ee84631c878b8ebc4d0 12.114.161.16:6386
   slots: (0 slots) slave
   replicates 6e961a4765b555189708bebb69badf7dfad25cd5
M: f097fec937f54d147d316c1c62e26cb67c9fd059 12.114.161.16:6382
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
S: 0e34147ce2544cd90f5cce78d5493ae9e8625dfe 12.114.161.16:6384
   slots: (0 slots) slave
   replicates f097fec937f54d147d316c1c62e26cb67c9fd059
M: 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2 12.114.161.16:6383
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
S: 9bc2417a9cd6545ef2445eb4aa0610d586acd73b 12.114.161.16:6385
   slots: (0 slots) slave
   replicates 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.   # 哈希槽166384个全部覆盖

至此，说明创建哈希槽成功！！！

第三步，进入任意容器内部的Redis，查看集群状态
两个重要命令：

# 进入Redis
redis-cli -p 6381

# 查看槽位信息
cluster info
# 查看节点信息，尤其主从节点如何分配关系
cluster nodes

127.0.0.1:6381> cluster nodes
4ed46e0368698cd9d5af2ee84631c878b8ebc4d0 122.114.161.116:6386@16386 slave 6e961a4765b555189708bebb69badf7dfad25cd5 0 1705242300000 1 connected
f097fec937f54d147d316c1c62e26cb67c9fd059 122.114.161.116:6382@16382 master - 0 1705242299110 2 connected 5461-10922
0e34147ce2544cd90f5cce78d5493ae9e8625dfe 122.114.161.116:6384@16384 slave f097fec937f54d147d316c1c62e26cb67c9fd059 0 1705242300113 2 connected
78ac7be13522bd4ffd6fcf900c6c149c6938ecc2 122.114.161.116:6383@16383 master - 0 1705242298000 3 connected 10923-16383
6e961a4765b555189708bebb69badf7dfad25cd5 122.114.161.116:6381@16381 myself,master - 0 1705242297000 1 connected 0-5460
9bc2417a9cd6545ef2445eb4aa0610d586acd73b 122.114.161.116:6385@16385 slave 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2 0 1705242301116 3 connected