Docker use tutorial related series catalog
table of Contents
1. Create a configuration file
1. Create a database, create a table, insert data
2. Start a new mysql container and close the current mysql container
Scenes
Citizen Zhao Tiezhu works as a development engineer in Company A. One day, a website maintained by Zhao Tiezhu could not be accessed. After investigation, it was found that the mysql container of docker was hung up. This is simple. Zhao Tiezhu took a cup of coffee without rushing. Started the mysql container. I thought about what to order for takeaway at noon.
Seeing that the mysql container started successfully, and then I visited the website to test it, and the data was gone. . Let us mourn for the citizen Zhao Tiezhu for three seconds
Analyze the reasons
What mistake did Zhao Tiezhu make that caused the loss of data?
After investigation, it was found that Zhao Tiezhu did not do the data persistence of the mysql container in order to be lazy.
solution
in conclusion
Mount the data from the container to the host
For students who don’t understand docker's data volume mounting, please see here: How docker mounts data from the host to the container (1)
1. Create a configuration file
Create configuration file storage location and data mapping location
mkdir -p /mysql/config /mysql/dataCreate and edit configuration files
vi /mysql/config/my.confThe content of my.conf configuration file is as follows
[mysqld]
user=mysql
character-set-server=utf8
default_authentication_plugin=mysql_native_password
[client]
default-character-set=utf8
[mysql]
default-character-set=utf82. Start the container
First check the containers that are already running, and stop the mysql57 container from serving
docker ps
docker stop mysql57 
docker run -d -p 3306:3306 --restart always --privileged=true --name dream_mysql57 -e MYSQL_ROOT_PASSWORD=root -v /mysql/config/my.conf:/etc/my.cof -v=/mysql/data:/var/lib/mysql mysql:5.7 
-d 后台运行容器
-p 3306:3306 指定端口映射(主机(宿主)端口:容器端口)
--restart=always 开机启动
--privileged=true 提升容器内权限
--name 为容器指定一个名称
-e 设置环境变量
MYSQL_ROOT_PASSWORD=root 初始密码
-v /mysql/config/my.conf:/etc/my.cof 映射配置文件
-v=/mysql/data:/var/lib/mysql 映射数据目录
mysql:5.7 镜像名称和版本号3. Test the connection
4. Verify data persistence
1. Create a database, create a table, insert data
Enter the test database and execute the following sql script
DROP TABLE IF EXISTS `test_table`;
CREATE TABLE `test_table` (
`uuid` varchar(32) NOT NULL,
`test_name` varchar(32) NOT NULL COMMENT '姓名',
PRIMARY KEY (`uuid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of test_table
-- ----------------------------
INSERT INTO `test_table` VALUES ('aaaa', '测试数据');
2. Start a new mysql container and close the current mysql container
Start the dream_mysql57_3307 container, and the external mapping port is 3307
docker run -d -p 3307:3306 --restart always --privileged=true --name dream_mysql57_3307 -e MYSQL_ROOT_PASSWORD=root -v /mysql/config/my.conf:/etc/my.cof -v=/mysql/data:/var/lib/mysql mysql:5.7Close the current mysql container
docker stop dream_mysql57
Access 3307 service
The data is still there
3. Some students may ask, if the current container is deleted, then start a new mysql container, the data is still there
Action is not as good as heart, let’s verify
First kill all the mysql containers
No more now
Then recreate the mysql container
docker run -d -p 3306:3306 --restart always --privileged=true --name dream_mysql57_3306 -e MYSQL_ROOT_PASSWORD=root -v /mysql/config/my.conf:/etc/my.cof -v=/mysql/data:/var/lib/mysql mysql:5.7Don't rush to visit, first check if the container is started
The container is started
Then access through the client
The data is also there. This time the boss will not sue me, happy. .