How to connect to a one-click MySQL application from a Docker container on a one-click docker-machine application?

I am using the docker-machine cli to start up the one-click docker machine and tried to connect to the one-click MySQL from one of the docker container. Obviously, I set up the cloud firewall for both machines and turned off the default ufw. For the docker-machine, it accepts HTTP/HTTPs for its inbound rules. For the database, it only accepts MYSQL(TCP):3306 connections from the ip of docker-machine for its inbound rules. In addition, I also change the bind-address at /etc/mysql/mysql.conf.d/mysqld.cnf path on database machine to its own private ip within the data center or public address. Neither of them can be connected and it just keeps returning ‘Connection timeout’. Anyone can help?

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What I could suggest in this case is following this step by step guide on how to allow remote access to your MySQL server:

regards, Bobby