Solution to the Docker container being unable to access the host port

I recently encountered a problem at work. The docker container could not access the host's redis, and the telent6379 port was blocked.

After investigation, it was found that the server had a firewall enabled, and the firewall authorized access to port 6379 to the docker0 network card.

The operation is as follows:

firewall-cmd --permanent --zone=trusted --change-interface=docker0

firewall-cmd --reload

Additional knowledge: Docker starts the mysql container and an error occurs: Ports are not available: listen tcp 0.0.0.0:3306

The error screenshot is as follows

This error is caused by the local port 3306 being occupied. It is likely that MySQL has been installed locally and the MySQL service has been started.

Solution 1: Open the service, find the mysql service, stop it, or change the port

Then execute the following command

docker run --name MYSQL -e MYSQL_ROOT_PASSWORD=123456 -p 3306:3306 -itd mysql:latest /bin/bash

As shown in the figure, the startup is successful

Solution 2: Change port mapping

docker run --name MYSQL -e MYSQL_ROOT_PASSWORD=123456 -p 3309:3306 -itd mysql:latest /bin/bash

illustrate:

-p 3309:3306: -p host port: container port, that is, map the host port 3309 to the container port 3306. When the host logs in to the container database, use the host port, such as 3309.

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