Docker quickly set up master-slave + sentry monitoring

Install Redis

Execute command

My official group Click here .

docker pull redis

Deployment plan

Start three machines, 6379 container as master node, the rest as slave node

Start preparations

 

directory structure

├── 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 configuration file

Download the configuration file. The specific configuration can be adjusted separately

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

  

Sentinel.conf configuration file

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 startup script file

#!/usr/bin/env bash
set -e

# Script current directory
cPath=$(cd $(dirname "$0") || exit; pwd)

# root directory
dirPath=$(dirname "$cPath")

# Get port
port="$1"
if [[ ! "$port" ]]; then
  port=6379
fi

# Create data directory
mkdir -p "$dirPath"/data_"$port"

# Delete started services
containerId=$(docker ps -a | grep "redis_$port" | awk -F' ' '{print $1}')
if [[ "$containerId" ]]; then
    echo "Deleting service: ${containerId}"
    docker rm -f ${containerId} > /dev/null
fi

# Start service
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 startup script file

#!/usr/bin/env bash
set -e

# Script current directory
cPath=$(cd $(dirname "$0") || exit; pwd)

# root directory
dirPath=$(dirname "$cPath")

# Set port
port=$1
if [[ ! "$port" ]]; then
  port=26379
fi

# Delete started services
containerId=$(docker ps -a | grep "sentinel_$port" | awk -F' ' '{print $1}')
if [[ "$containerId" ]]; then
    echo "Deleting service: ${containerId}"
    docker rm -f ${containerId} > /dev/null
fi

# Start service
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

  

be careful

Start the sentinel service if the following error occurs

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...

  

Solution

  • Add = = - w=/etc/redis / = = = in docker run. See sentinel.sh script for details
  • Modify directory permissions
docker run -it --rm --privileged=true -v=/root/docker-config/redis/conf/:/etc/redis/ redis chown -R redis /etc/redis

  

Main statement: = = chown -R redis /etc/redis==

 

View modified permissions

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

  

Start Redis service

 

Start main service

sh scripts/run.sh 6379

  

Start slave service

sh scripts/run.sh 6380
sh scripts/run.sh 6381

  

Access from service

docker exec -it redis_6380 bash
docker exec -it redis_6381 bash
# Execute command after entering container
redis-cli

# Set to slave
slaveof 172.17.0.2 6379

  

design sketch

 

 

 

Start Sentinel service

sh scripts/sentinel.sh

  

design sketch

 

 

 

Manually stop the main service

  • The current machine service structure is as follows
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

  

Execute command: docker stop redis

1:X 10 May 2020 12:52:15.634 # +sdown master mymaster 172.17.0.2 6379
1:X 10 May 2020 12:52:15.634 # +odown master mymaster 172.17.0.2 6379 #quorum 1/1
1:X 10 May 2020 12:52:15.634 # +new-epoch 1
1:X 10 May 2020 12:52:15.634 # +try-failover master mymaster 172.17.0.2 6379
1:X 10 May 2020 12:52:15.649 # +vote-for-leader 6905a137af7baedbdfce4978d1d9126fdaad4faf 1
1:X 10 May 2020 12:52:15.649 # +elected-leader master mymaster 172.17.0.2 6379
1:X 10 May 2020 12:52:15.649 # +failover-state-select-slave master mymaster 172.17.0.2 6379
1: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
1: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
1: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
1: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
1:X 10 May 2020 12:52:16.798 # +failover-state-reconf-slaves master mymaster 172.17.0.2 6379
1: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
1: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
1: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
1:X 10 May 2020 12:52:17.937 # +failover-end master mymaster 172.17.0.2 6379

# Generate execute failover
1:X 10 May 2020 12:52:17.937 # +switch-master mymaster 172.17.0.2 6379 172.17.0.3 6379

1: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
1: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

1: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

  

be careful

172.17.0.2:6379 the primary node will automatically switch to the slave service after it is online again

 

For more information, please visit:

Tencent T3-T4 standard boutique PHP architect tutorial directory, as long as you read it to ensure a higher salary (continuous update)

Tags: PHP Redis Docker REST Permission denied

Posted on Mon, 11 May 2020 10:06:36 -0400 by Angry Coder