After that you need to create MySQL server Docker container. Create the configuration file:
echo "[mysqld]
sql_mode = 'NO_ENGINE_SUBSTITUTION'
max_connections = 1000
max_allowed_packet = 1048576000
group_concat_max_len = 2048" > /app/onlyoffice/mysql/conf.d/onlyoffice.cnf
Create the SQL script which will generate the users and issue the rights to them. The onlyoffice_user is required for ONLYOFFICE Community Server, and the mail_admin is required for ONLYOFFICE Mail in case it is going to be installed:
echo "ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'my-secret-pw';
CREATE USER IF NOT EXISTS 'onlyoffice_user'@'%' IDENTIFIED WITH mysql_native_password BY 'onlyoffice_pass';
CREATE USER IF NOT EXISTS 'mail_admin'@'%' IDENTIFIED WITH mysql_native_password BY 'Isadmin123';
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%';
GRANT ALL PRIVILEGES ON *.* TO 'onlyoffice_user'@'%';
GRANT ALL PRIVILEGES ON *.* TO 'mail_admin'@'%';
FLUSH PRIVILEGES;" > /app/onlyoffice/mysql/initdb/setup.sql
Please note, that the above script will set permissions to access SQL server from any domains (%). If you want to limit the access, you can specify hosts which will have access to SQL server.
Now you can create MySQL container setting MySQL version to 8.0.29:
sudo docker run --net onlyoffice -i -t -d --restart=always --name onlyoffice-mysql-server \
-v /app/onlyoffice/mysql/conf.d:/etc/mysql/conf.d \
-v /app/onlyoffice/mysql/data:/var/lib/mysql \
-v /app/onlyoffice/mysql/initdb:/docker-entrypoint-initdb.d \
-e MYSQL_ROOT_PASSWORD=my-secret-pw \
-e MYSQL_DATABASE=onlyoffice \
mysql:8.0.29