Docker28:Redis集群

1. 说明

# 拉取redis镜像
docker pull redis:latest

2. 创建Redis网络

# 创建自定义redis网络
root@docker:/home/henggao/Desktop# docker network create redis --subnet 172.38.0.0/16
a186dbfeae7e588590e3eea18f8e4eda3ff3a9c5134cc02a984d766835249a7e
# 查看网络
root@docker:/home/henggao/Desktop# docker network ls
NETWORK ID     NAME          DRIVER    SCOPE
bca0a8305f26   bridge        bridge    local
9d5d46f3b050   host          host      local
adc9329dead3   mynet         bridge    local
591d8f64be59   none          null      local
a186dbfeae7e   redis         bridge    local
5d91f2e85a2b   somenetwork   bridge    local
# 查看自定义redis网络信息，目前没有网络
root@docker:/home/henggao/Desktop# docker network inspect redis
[
    {
        "Name": "redis",
        "Id": "a186dbfeae7e588590e3eea18f8e4eda3ff3a9c5134cc02a984d766835249a7e",
        "Created": "2021-11-18T11:06:06.036879264+08:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "172.38.0.0/16"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {},
        "Options": {},
        "Labels": {}
    }
]
root@docker:/home/henggao/Desktop#

3. 创建配置文件

• 本机创建文件

# 使用脚本创建六个redis配置文件
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 172.38.0.1${port}
cluster-announce-port 6379
cluster-announce-bus-port 16379
appendonly yes
EOF
done

root@docker:/home# cd /mydata/
root@docker:/mydata# ls
redis
root@docker:/home# cd /mydata/redis/
root@docker:/mydata/redis# ls
node-1  node-2  node-3  node-4  node-5  node-6
root@docker:/mydata/redis# cd node-1
root@docker:/mydata/redis/node-1# ls
conf
root@docker:/mydata/redis/node-1# cd conf/
root@docker:/mydata/redis/node-1/conf# ls
redis.conf
root@docker:/mydata/redis/node-1/conf# cat redis.conf 
port 6379
bind 0.0.0.0
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
cluster-announce-ip 172.38.0.11
cluster-announce-port 6379
cluster-announce-bus-port 16379
appendonly yes
root@docker:/mydata/redis/node-1/conf#

4. 启动集群

4.1 创建容器

# 启动第1个redis服务：外部暴露端口号：6371、 卷挂载、 网络为：172.38.0.11
docker run -p 6371:6379 -p 16371:16379 --name redis-1 \
-v /mydata/redis/node-1/data:/data \
-v /mydata/redis/node-1/conf/redis.conf:/etc/redis/redis.conf \
-d --net redis --ip 172.38.0.11 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf


# 使用脚本启动6个redis容器
for port in $(seq 1 6); \
do \
docker run -p 637${port}:6379 -p 1637${port}:16379 --name redis-${port} \
-v /mydata/redis/node-${port}/data:/data \
-v /mydata/redis/node-${port}/conf/redis.conf:/etc/redis/redis.conf \
-d --net redis --ip 172.38.0.1${port} redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf
done

4.2 进入容器

docker exec -it redis-1 /bin/sh

4.3 创建集群

# 搭建集群
redis-cli --cluster create 172.38.0.11:6379 172.38.0.12:6379 172.38.0.13:6379 172.38.0.14:6379 172.38.0.15:6379 172.38.0.16:6379 --cluster-replicas 1

# 集群连接
redis-cli -c
# 查看信息
cluster info
# 查看节点
cluster nodes

4.4. 测试

1. 我们创建一个k，v

set k1 v1

1. 此时我们模拟redis-3宕机，直接停掉 redis-3 容器，查看刚才的k1，是否可以获得？

root@docker:/home/henggao# docker stop redis-3
redis-3
root@docker:/home/henggao#

# 1. Ctrl + c退出，重新集群
/data # redis-cli -c
# 2. 查看数据
127.0.0.1:6379> get k1
-> Redirected to slot [12706] located at 172.38.0.14:6379
"v1"
172.38.0.14:6379>

cluster nodes