【Docker】搭建部署Redis高可用集群实验

一、示意图

二、创建Redis网络

执行命令

docker network ls
docker network create redis --subnet 192.168.100.0/24
docker network inspect redis

执行命令结果

[root@docker ~]# docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
d000c2d78106   bridge    bridge    local
9fd62dbfb07f   host      host      local
27700772b8f7   none      null      local
[root@docker ~]# docker network create redis --subnet 192.168.100.0/24
75c42ccdfaff7291081a73cf6f28eeb629c80da12b1ec55153a8171d2bc98155
[root@docker ~]# docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
d000c2d78106   bridge    bridge    local
9fd62dbfb07f   host      host      local
27700772b8f7   none      null      local
75c42ccdfaff   redis     bridge    local
[root@docker ~]# docker network inspect redis
[
    {
    
    
        "Name": "redis",
        "Id": "75c42ccdfaff7291081a73cf6f28eeb629c80da12b1ec55153a8171d2bc98155",
        "Created": "2022-05-11T00:09:44.013536884+08:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
    
    
            "Driver": "default",
            "Options": {
    
    },
            "Config": [
                {
    
    
                    "Subnet": "192.168.100.0/24",
                    "Gateway": "192.168.100.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
    
    
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
    
    },
        "Options": {
    
    },
        "Labels": {
    
    }
    }
]
[root@docker ~]#

三、创建Redis配置文件

执行脚本创建redis配置文件命令

for port in $(seq 1 6); \
do \
mkdir -p /mydata/redis/node-${port}/conf
touch /mydata/redis/node-${port}/conf/redis.conf
cat << EOF >/mydata/redis/node-${port}/conf/redis.conf 
port 6379
bind 0.0.0.0
cluster-enabled yes 
cluster-config-file nodes.conf 
cluster-node-timeout 5000 
cluster-announce-ip 192.168.100.1${port} 
cluster-announce-port 6379 
cluster-announce-bus-port 16379 
appendonly yes
EOF
done

执行命令结果

[root@docker ~]# for port in $(seq 1 6); \
> do \
> mkdir -p /mydata/redis/node-${port}/conf
> touch /mydata/redis/node-${port}/conf/redis.conf
> cat << EOF >/mydata/redis/node-${port}/conf/redis.conf
> port 6379
> bind 0.0.0.0
> cluster-enabled yes
> cluster-config-file nodes.conf
> cluster-node-timeout 5000
> cluster-announce-ip 172.36.0.1${port}
> cluster-announce-port 6379
> cluster-announce-bus-port 16379
> appendonly yes
> EOF
> done
[root@docker ~]# ll /mydata/redis/
total 0
drwxr-xr-x 3 root root 18 May 11 23:07 node-1
drwxr-xr-x 3 root root 18 May 11 23:07 node-2
drwxr-xr-x 3 root root 18 May 11 23:07 node-3
drwxr-xr-x 3 root root 18 May 11 23:07 node-4
drwxr-xr-x 3 root root 18 May 11 23:07 node-5
drwxr-xr-x 3 root root 18 May 11 23:07 node-6
[root@docker ~]# cat /mydata/redis/node-1/conf/redis.conf
port 6379
bind 0.0.0.0
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
cluster-announce-ip 172.36.0.11
cluster-announce-port 6379
cluster-announce-bus-port 16379
appendonly yes
[root@docker ~]#

四、启动Redis容器

执行六条命令，分别创建六个redis容器

# 第一个节点配置命令
docker run -p 6371:6379 -p 16371:16379 --name redis-01 \
-v /mydata/redis/node-1/data:/data \
-v /mydata/redis/node-1/conf/redis.conf:/etc/redis/redis.conf \
-d --net redis --ip 192.168.100.11 redis:6-alpine3.15 redis-server /etc/redis/redis.conf 

# 命令参数解释：
# -p 6371:6379 对外端口
# -p 16371:16379 Redis内部通信端口
# -v /mydata/redis/node-1/data:/data 绑定挂载卷（容器内外挂载路径）
# -d 在后台运行容器并打印容器ID
# --net redis 使用自定义redis网络
# --ip 指定IP地址
# redis:6-alpine3.15 指定Redis版本号

# 第二个节点配置命令
docker run -p 6372:6379 -p 16372:16379 --name redis-02 \
-v /mydata/redis/node-2/data:/data \
-v /mydata/redis/node-2/conf/redis.conf:/etc/redis/redis.conf \
-d --net redis --ip 192.168.100.12 redis:6-alpine3.15 redis-server /etc/redis/redis.conf 

# 第三个节点配置命令
docker run -p 6373:6379 -p 16373:16379 --name redis-03 \
-v /mydata/redis/node-3/data:/data \
-v /mydata/redis/node-3/conf/redis.conf:/etc/redis/redis.conf \
-d --net redis --ip 192.168.100.13 redis:6-alpine3.15 redis-server /etc/redis/redis.conf 

# 第四个节点配置命令
docker run -p 6374:6379 -p 16374:16379 --name redis-04 \
-v /mydata/redis/node-4/data:/data \
-v /mydata/redis/node-4/conf/redis.conf:/etc/redis/redis.conf \
-d --net redis --ip 192.168.100.14 redis:6-alpine3.15 redis-server /etc/redis/redis.conf 

# 第五个节点配置命令
docker run -p 6375:6379 -p 16375:16379 --name redis-05 \
-v /mydata/redis/node-5/data:/data \
-v /mydata/redis/node-5/conf/redis.conf:/etc/redis/redis.conf \
-d --net redis --ip 192.168.100.15 redis:6-alpine3.15 redis-server /etc/redis/redis.conf 

# 第六个节点配置命令
docker run -p 6376:6379 -p 16376:16379 --name redis-06 \
-v /mydata/redis/node-6/data:/data \
-v /mydata/redis/node-6/conf/redis.conf:/etc/redis/redis.conf \
-d --net redis --ip 192.168.100.16 redis:6-alpine3.15 redis-server /etc/redis/redis.conf 

查看部署的Redis容器

[root@docker ~]# docker ps
CONTAINER ID   IMAGE                COMMAND                  CREATED          STATUS          PORTS                                                                                      NAMES
34864cf361ab   redis:6-alpine3.15   "docker-entrypoint.s…"   4 minutes ago    Up 4 minutes    0.0.0.0:6376->6379/tcp, :::6376->6379/tcp, 0.0.0.0:16376->16379/tcp, :::16376->16379/tcp   redis-06
cb3667596bd8   redis:6-alpine3.15   "docker-entrypoint.s…"   4 minutes ago    Up 4 minutes    0.0.0.0:6375->6379/tcp, :::6375->6379/tcp, 0.0.0.0:16375->16379/tcp, :::16375->16379/tcp   redis-05
190ca9226db4   redis:6-alpine3.15   "docker-entrypoint.s…"   4 minutes ago    Up 4 minutes    0.0.0.0:6374->6379/tcp, :::6374->6379/tcp, 0.0.0.0:16374->16379/tcp, :::16374->16379/tcp   redis-04
cd9fae883a1f   redis:6-alpine3.15   "docker-entrypoint.s…"   4 minutes ago    Up 4 minutes    0.0.0.0:6373->6379/tcp, :::6373->6379/tcp, 0.0.0.0:16373->16379/tcp, :::16373->16379/tcp   redis-03
6784b9a3fa94   redis:6-alpine3.15   "docker-entrypoint.s…"   5 minutes ago    Up 5 minutes    0.0.0.0:6372->6379/tcp, :::6372->6379/tcp, 0.0.0.0:16372->16379/tcp, :::16372->16379/tcp   redis-02
884dd21979fb   redis:6-alpine3.15   "docker-entrypoint.s…"   11 minutes ago   Up 11 minutes   0.0.0.0:6371->6379/tcp, :::6371->6379/tcp, 0.0.0.0:16371->16379/tcp, :::16371->16379/tcp   redis-01

五、创建Redis集群

执行命令

docker exec -it redis-01 /bin/sh

redis-cli --cluster create 192.168.100.11:6379 192.168.100.12:6379 192.168.100.13:6379 192.168.100.14:6379 192.168.100.15:6379 192.168.100.16:6379 --cluster-replicas 1

执行命令结果

六、查看Redis集群

执行命令

# 进入集群
redis-cli -c

# 查看集群内节点
cluster nodes

执行命令结果

七、测试Redis集群高可用

模拟redis集群中某台节点丢失，例如，将Redis-03节点停止服务。
执行命令

# 查看节点
docker ps

# 停止redis-03节点
docker stop redis-03

执行命令结果

查看Redis集群中，节点变化情况，是否实现集群高可用

重新启动redis-03节点

docker start redis-03
docker exec -it redis-01 /bin/sh

九、学习链接

Redis - Official Image | Docker Hub

【狂神说Java】Docker最新超详细版教程通俗易懂_哔哩哔哩_bilibili