Grant Privileges to Root via Dockerfile - mysql

Question

Is there some way to grant all privileges to root via Dockerfile ou docker-compose.yml?
I'm trying to boot up a mysql:latest image like this:
docker-compose.yml
version: "3.9"
services:
mysql_database:
container_name: mysql_test_server
restart: always
build: .
image: mysql:latest
command: --default-authentication-plugin=mysql_native_password
ports:
- 3306:3306
volumes:
- ./data:/var/lib/mysql
- ./config:/etc/mysql/conf.d
environment:
MYSQL_ROOT_PASSWORD: root
dockerfile (the build: . on .yml)
FROM mysql:latest
RUN mysql -u root -proot -h localhost -p 3306
RUN grant all privileges on *.* to 'root'#'%' identified by 'root';
RUN flush all privileges;
RUN exit;
EXPOSE 3306
TLDR; I just want to grant privileges for remote connections (SQLYog, DBeaver, etc) automatically... if docker-compose up, run this command so I don't need to do manually, like docker exet -it mysql_test_server mysql -u root ...
I awalys get this:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

Answer 1

Your MySQL server is not running in this docker file, so you are getting errors.
The default docker image has root user and root user has all privileges.
You have to use environment variables to achieve what you try to do:
Run this command:
docker run --name some-mysql \
-v /my/own/datadir:/var/lib/mysql \
-e MYSQL_ROOT_PASSWORD=rootPassword \
-e MYSQL_ROOT_HOST="%" \
-p 3306:3306 \
-d mysql:tag
You have to replace paths in the -v parameter.
Then you can login to MySQL with command:
mysql -uroot -prootPassword -h127.0.0.1
The parameter you should take a look is MYSQL_ROOT_HOST. That variable is used in the MySQL container entrypoint: https://github.com/docker-library/mysql/blob/master/8.0/docker-entrypoint.sh#L232-L239