如何在没有端口冲突的情况下将 mysql 端口从主机绑定到 docker 容器

Question

I have a docker container running a Flask application that connects to a mySQL server. The mySQL server is hosted on the host machine at port 3308 on a windows 10 machine.

When executing docker run -p 5000:5000 -p 3308:3308 -t webui

I receive the error Ports are not available: listen tcp 0.0.0.0:3308: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted. due to the port being used by the mySQL server on the host machine

How do I map the port of the mySQL to the docker container such that the Flask application can access the database?

Answer 1

There are 2 ways to achieve this. The first approach is the recommended one.

The first is to add an entry to /etc/hosts inside the container:

docker run -p 5000:5000 -p 3308:3308 --add-host database:<HOST_IP> -t webui

You need to replace HOST_IP with the network IP of your host. Then you can reference the database inside your container using the name "database" (you can also customize this one).

The second is to bind your container to your host's interface:

docker run -p 5000:5000 -p 3308:3308 --bind 127.0.0.1 -t webui

Then you can refer to your database with 127.0.0.1 inside your container.

Answer 2

The issue was caused by the host name. The mySQL database port did not need to be bound to the container as it did not need to receive any inbound calls, only outbound to the database. Resolved by adding a new entry into the container's /etc/hosts file as described here .