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docker inspect mysql:5.7
"Entrypoint": [
 "docker-entrypoint.sh"
 ],

##挂载到容器内/docker-entrypoint-initdb.d；MySQL启动时将执行 01_create_database.sql
/root/mysql-5.7/init-data
　　01_create_database.sql
　　##content
　　create database test_database DEFAULT CHARSET utf8 COLLATE utf8_general_ci;
　　grant all privileges on `test_database`.* to 'test_user'@'%' identified by '123456';
　　flush privileges;

##挂载到容器内 /var/lib/mysql
/root/mysql-5.7/mysql

docker run -p 33336:3306 -v /root/mysql-5.7/mysql:/var/lib/mysql -v /root/mysql-5.7/init-data:/docker-entrypoint-initdb.d -e MYSQL_ROOT_PASSWORD=123456 --name mysql_5.7 -d mysql/mysql:5.7

docker exec -ti <containerID> sh
mysql -uroot -p123456
show databases;