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Installing Docker and using docker to install other tools.

Docker

1. install for WSL https://docs.docker.com/desktop/wsl/

2. install for centos7 https://docs.docker.com/engine/install/centos/#install-docker-engine-on-centos

3. install for ubuntu https://docs.docker.com/engine/install/ubuntu/

Follow the instructions to install it.

To set Docker to start automatically:

WSL:

service docker start

CentOS:

sudo systemctl enable docker

MySQL

Get MySQL Image

docker pull mysql

Create and Start MySQL Instance

docker run -p 3306:3306 --name mysql \
-v /mydata/mysql/log:/var/log/mysql \
-v /mydata/mysql/data:/var/lib/mysql \
-v /mydata/mysql/conf:/etc/mysql/conf.d \
-e MYSQL_ROOT_PASSWORD=root \
-d mysql

Parameter Explanation:

• -p 3306:3306: Maps the container’s 3306 port to the host’s 3306 port.
• -v /mydata/mysql/conf:/etc/mysql: Mounts the configuration folder to the host.
• -v /mydata/mysql/log:/var/log/mysql: Mounts the log folder to the host.
• -v /mydata/mysql/data:/var/lib/mysql/config.d: Mounts the data folder to the host.
• -e MYSQL_ROOT_PASSWORD=root: Initializes the password for the root user.

Then check the status of the container:

docker ps -a

My error note

I run into an error of:

[root@localhost vagrant]# docker ps -a
CONTAINER ID   IMAGE         COMMAND                  CREATED         STATUS                     PORTS     NAMES
8adbd5efd699   mysql         "docker-entrypoint.s…"   6 minutes ago   Exited (1) 6 minutes ago             mysql

The container didn’t start successfully and couldn’t started manually. So I checked the logs of the error info:

docker logs 8adbd5efd699
2023-12-23 21:11:04+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.2.0-1.el8 started.
2023-12-23 21:11:04+00:00 [ERROR] [Entrypoint]: mysqld failed while attempting to check config
        command was: mysqld --verbose --help --log-bin-index=/tmp/tmp.XmFIY0PZWm
        mysqld: Can't read dir of '/etc/mysql/conf.d/' (OS errno 2 - No such file or directory)
mysqld: [ERROR] Stopped processing the 'includedir' directive in file /etc/my.cnf at line 36.
mysqld: [ERROR] Fatal error in defaults handling. Program aborted!

This is because I didn’t add the conf.g at the command line -v /mydata/mysql/conf:/etc/mysql/config.d \

Delete the stopped container

docker container prune

Logging into the container:

docker exec -it mysql /bin/bash

MySQL Config

Add the following config to /mydata/mysql/conf/my.cnf, create that file

[client]
default-character-set=utf8

[mysql]
default-character-set=utf8

[mysqld]
init_connect='SET collation_connection = utf8_unicode_ci'
init_connect='SET NAMES utf8'
character-set-server=utf8
collation-server=utf8_unicode_ci
skip-character-set-client-handshake
skip-name-resolve

Then restart docker

docker restart mysql

Set always restart by default

docker update mysql --restart=always

Redis

Get Redis Image

docker pull redis

Create and Start Redis Instance

Create directory structure and the config file

mkdir -p /mydata/redis/conf
touch /mydata/redis/conf/redis.conf

This steps is to prevent the following command read redis.conf as a directory not a file

Create and Run

docker run -p 6379:6379 --name redis \
-v /mydata/redis/data:/data \
-v /mydata/redis/conf/redis.conf:/etc/redis/redis.conf \
-d redis redis-server /etc/redis/redis.conf

Test its usage

docker exec -it redis redis-cli
127.0.0.1:6379> set a b
OK
127.0.0.1:6379> get a
"b"
127.0.0.1:6379> exit

To make the data persistent, add config to the file /mydata/redis/conf/redis.conf

appendonly yes

For my WSL, I encountered an error saying I need to enable certain permissions. To solve this, run the command:

sysctl vm.overcommit_memory=1

Install Redis desktop manager

I use this: https://github.com/qishibo/AnotherRedisDesktopManager/releases

Set always restart by default.

docker update redis --restart=always

Author: o_oyao

Link: http://dyingdown.github.io/2023/12/23/E-Commerce-Platform-02-Docker-Setup/

License: All articles in this blog are licensed under CC BY-NC-SA 4.0 unless stating additionally.