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Docker 快速搭建主从 + 哨兵监控

发布于2021-03-14 06:04 阅读(783) 评论(0) 点赞(11) 收藏(4)

安装 Redis

执行命令

我的官方群点击此处。

docker pull redis

部署方案

启动三台机器，6379 容器作为主节点，其余作为从节点

开始准备工作

目录结构

├── conf
│   ├── redis_6379.conf
│   ├── redis_6380.conf
│   ├── redis_6381.conf
│   ├── sentinel_26379.conf
│   ├── sentinel_26380.conf
│   └── sentinel_26381.conf
├── data_6379
│   ├── appendonly.aof
│   └── dump.rdb
├── data_6380
│   └── dump.rdb
├── data_6381
│   └── dump.rdb
└── scripts
    ├── run.sh
    └── sentinel.sh

redis_.conf 配置文件

下载配置文件，具体配置另行调整即可

1	`https://raw.githubusercontent.com/antirez/redis/5.0/redis.conf`

sentinel_.conf 配置文件

port 26379
dir "/etc/redis"
sentinel monitor mymaster 172.17.0.2 6379 1
sentinel down-after-milliseconds mymaster 60000
sentinel failover-timeout mymaster 180000

run.sh 启动脚本文件

#!/usr/bin/env bash
set -e
 
# 脚本当前目录
cPath=$(cd $(dirname "$0") || exit; pwd)
 
# 根目录
dirPath=$(dirname "$cPath")
 
# 获取端口
port="$1"
if [[ ! "$port" ]]; then
  port=6379
fi
 
# 创建数据目录
mkdir -p "$dirPath"/data_"$port"
 
# 删除已启动服务
containerId=$(docker ps -a | grep "redis_$port" | awk -F' ' '{print $1}')
if [[ "$containerId" ]]; then
    echo "正在删除服务：${containerId}"
    docker rm -f ${containerId} > /dev/null
fi
 
# 启动服务
docker run -itd --privileged=true -p "$port":6379 --name redis_"$port" \
-v="$dirPath"/conf/redis_"$port".conf:/etc/redis/redis.conf \
-v="$dirPath"/data_"$port":/data \
redis \
redis-server /etc/redis/redis.conf

sentinel.sh 启动脚本文件

#!/usr/bin/env bash
set -e
 
# 脚本当前目录
cPath=$(cd $(dirname "$0") || exit; pwd)
 
# 根目录
dirPath=$(dirname "$cPath")
 
# 设置端口
port=$1
if [[ ! "$port" ]]; then
  port=26379
fi
 
# 删除已启动服务
containerId=$(docker ps -a | grep "sentinel_$port" | awk -F' ' '{print $1}')
if [[ "$containerId" ]]; then
    echo "正在删除服务：${containerId}"
    docker rm -f ${containerId} > /dev/null
fi
 
# 启动服务
docker run -itd --privileged=true -p "$port":26379 --name "sentinel_$port" \
-v="${dirPath}/conf/sentinel_${port}.conf":/etc/redis/sentinel.conf \
-w=/etc/redis/ \
redis \
redis-server /etc/redis/sentinel.conf --sentinel

注意

启动 sentinel 服务如果如下错误

1 2	`1:X 10 May 2020 08:10:48.234 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn` `is` `set` `to the lower value of 128.` `1:X 10 May 2020 08:10:48.235 # Sentinel config file /etc/redis/sentinel.conf` `is` `not writable: Permission denied. Exiting...`

解决方案

在 docker run 中增加 ==-w=/etc/redis/==，具体见 sentinel.sh 脚本
修改目录权限

1	`docker run -it --rm --privileged=true` `-v=/root/docker-config/redis/conf/:/etc/redis/ redis chown -R redis /etc/redis`

主要语句：==chown -R redis /etc/redis==

查看修改后的权限

root@DESKTOP-Q13EI52:~/docker-config/redis# docker run -it --rm --privileged=true -v=/root/docker-config/redis/conf/:/etc/redis/ redis ls -l /etc/redis/
total 204
-rw-r--r-- 1 redis root 61793 May 10 07:41 redis_6379.conf
-rw-r--r-- 1 redis root 61864 May 10 12:52 redis_6380.conf
-rw-r--r-- 1 redis root 61890 May 10 12:52 redis_6381.conf
-rw-r--r-- 1 redis root   459 May 10 12:52 sentinel_26379.conf
-rw-r--r-- 1 redis root   161 May 10 07:56 sentinel_26380.conf
-rw-r--r-- 1 redis root   161 May 10 10:16 sentinel_26381.conf

启动 Redis 服务

启动主服务

1	`sh scripts/run.sh 6379`

启动从服务

1 2	`sh scripts/run.sh 6380` `sh scripts/run.sh 6381`

进入从服务

docker exec -it redis_6380 bash
docker exec -it redis_6381 bash
# 进入容器后执行命令
redis-cli
 
# 设置为从服务
slaveof 172.17.0.2 6379

效果图

启动 Sentinel 服务

1	`sh scripts/sentinel.sh`

效果图

手动停止主服务

目前机器服务结构如下

root@DESKTOP-Q13EI52:~/docker-config/redis# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED              STATUS              PORTS                                NAMES
e518580ce8eb        redis               "docker-entrypoint.s…"   About a minute ago   Up About a minute   6379/tcp, 0.0.0.0:26379->26379/tcp   sentinel_26379
e2ef253d3513        redis               "docker-entrypoint.s…"   2 hours ago          Up 2 hours          0.0.0.0:6381->6379/tcp               redis_6381
15fdc81eb530        redis               "docker-entrypoint.s…"   2 hours ago          Up 2 hours          0.0.0.0:6380->6379/tcp               redis_6380
77f4fdc84cb1        redis               "docker-entrypoint.s…"   2 hours ago          Up 2 hours          0.0.0.0:6379->6379/tcp               redis_6379

执行命令：docker stop redis_6379

X 10 May 2020 12:52:15.634 # +sdown master mymaster 172.17.0.2 6379
X 10 May 2020 12:52:15.634 # +odown master mymaster 172.17.0.2 6379 #quorum 1/1
X 10 May 2020 12:52:15.634 # +new-epoch 1
X 10 May 2020 12:52:15.634 # +try-failover master mymaster 172.17.0.2 6379
X 10 May 2020 12:52:15.649 # +vote-for-leader 6905a137af7baedbdfce4978d1d9126fdaad4faf 1
X 10 May 2020 12:52:15.649 # +elected-leader master mymaster 172.17.0.2 6379
X 10 May 2020 12:52:15.649 # +failover-state-select-slave master mymaster 172.17.0.2 6379
X 10 May 2020 12:52:15.725 # +selected-slave slave 172.17.0.3:6379 172.17.0.3 6379 @ mymaster 172.17.0.2 6379
X 10 May 2020 12:52:15.725 * +failover-state-send-slaveof-noone slave 172.17.0.3:6379 172.17.0.3 6379 @ mymaster 172.17.0.2 6379
X 10 May 2020 12:52:15.781 * +failover-state-wait-promotion slave 172.17.0.3:6379 172.17.0.3 6379 @ mymaster 172.17.0.2 6379
X 10 May 2020 12:52:16.798 # +promoted-slave slave 172.17.0.3:6379 172.17.0.3 6379 @ mymaster 172.17.0.2 6379
X 10 May 2020 12:52:16.798 # +failover-state-reconf-slaves master mymaster 172.17.0.2 6379
X 10 May 2020 12:52:16.845 * +slave-reconf-sent slave 172.17.0.4:6379 172.17.0.4 6379 @ mymaster 172.17.0.2 6379
X 10 May 2020 12:52:17.837 * +slave-reconf-inprog slave 172.17.0.4:6379 172.17.0.4 6379 @ mymaster 172.17.0.2 6379
X 10 May 2020 12:52:17.837 * +slave-reconf-done slave 172.17.0.4:6379 172.17.0.4 6379 @ mymaster 172.17.0.2 6379
X 10 May 2020 12:52:17.937 # +failover-end master mymaster 172.17.0.2 6379
 
# 生成执行故障转移
X 10 May 2020 12:52:17.937 # +switch-master mymaster 172.17.0.2 6379 172.17.0.3 6379
 
X 10 May 2020 12:52:17.938 * +slave slave 172.17.0.4:6379 172.17.0.4 6379 @ mymaster 172.17.0.3 6379
X 10 May 2020 12:52:17.938 * +slave slave 172.17.0.2:6379 172.17.0.2 6379 @ mymaster 172.17.0.3 6379
 
X 10 May 2020 12:53:18.010 # +sdown slave 172.17.0.2:6379 172.17.0.2 6379 @ mymaster 172.17.0.3 6379