Docker preparation for SpringBoot

review:

Introduction

Docker is an open source application container engine; it is a lightweight container technology;

Docker supports compiling software into a mirror; then configure various software in the mirror and publish the mirror, and other users can use the mirror directly; similar to the principle of the ghost system.

Key concept

1) Install linux system (by Baidu)

2) Install docker on linux system

① Check the kernel version (3.10 and above), use the command uname -r to view

② Install docker yum install docker

View version:

③ 启动docker systemctl start docker

If it fails to start, enter the /etc/sysconfig/ directory, edit the selinux file, and change the attribute value of selinux to disabled.

④ Query command (such as docker search mysql )

⑤ Download the image (docker pull <image name [can be the full name or abbreviation, such as: full name [docker.io/mysql], abbreviation [mysql]]>)

⑥ Specify the version of the downloaded image (the default is the latest version [latest]): docker pull <image name>:<version name>

⑦ Query docker images ( docker images )

⑧ Delete the specified mirror (docker rmi <mirror id>)

Container operation

Process: Identify the required image ==> run the image ==> generate the corresponding container (the software itself, such as tomcat)

Search mirror: docker search tomcat

Pull the image: docker pull tomcat (default is the latest version)

Start the container: docker run --name <custom container name, such as: mytomcat> -d[represents background operation] <image name>[can add version number]

docker run --name mytomcat -d tomcat:latest

View running/all images (software): docker ps / docker ps -a

Stop the running container: docker stop <id of running container>

When you know the container id, you can also use the command docker start <container id> to start the container

Delete the container, docker rm <container id>

External access to tomcat's docker container (do port mapping)

Command: docker run --name <custom container name> -d -p <virtual machine port>:<port to be mapped to tomcat> <tomcat image name>

Example: Map the port 8888 of the virtual machine to port 8080 of tomcat, so that the outside can access port 8080 of tomcat through port 8888

Access: ip:8888 Before this, you need to turn off the Linux firewall

View container logs: docker logs <container id>

One image can start multiple containers

More commands: https://docs.docker.com/engine/reference/commandline/docker/

Install and start mysql

Install the mirror, refer to the above, start the mirror, refer to the official document

docker run --name mysql01 -e MYSQL_ROOT_PASSWORD=<custom password> -d mysql

-p: do port mapping

-e: Specify the password of the root account

-d: run in the background

Connection test:

ps: If the connection is unsuccessful and error code 2059 is reported, please refer to the solution: https://blog.csdn.net/u013274055/article/details/83794340

step:

① Query specific mysql container id: docker ps -a

② Connect to the docker container of mysql: docker exec -it [specify container id] bash

③ Connect to mysql: mysql -u root -p

④ Modify the encryption method to mysql_native_password, and the password to root: alter user'root '@'%' identified with mysql_native_password by'root'

⑤ Execute the command to make the permission configuration item take effect immediately: flush privileges

Other advanced operations

Official document description:

Interpretation:

docker run --name [custom mysql name] -e MYSQL_ROOT_PASSWORD=[custom root account password] -d mysql:[specified version, default latest version] --character-set-server=utf8mb4 --collation-server= utf8mb4_unicode_ci (the red part is the specified encoding as utf-8)

docker run --name mysql_name -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:tag --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci

It means that the encoding of mysql is utf-8

docker run --name [Custom Name] -v [Custom Folder]: /etc/mysql/conf.d -e MYSQL_ROOT_PASSWORD = [self-defined root account password] -d mysql: [specified version]

docker run --name some-mysql -v /my/custom:/etc/mysql/conf.d -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:tag

It means to mount the [specified folder] of the host to the /etc/mysql/conf.d folder of the mysql docker container , so that you only need to put the mysql configuration file in a custom folder in the future. (The docker container will be integrated with the original configuration file of mysql)

Docker preparation for SpringBoot

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