How to modify the port of container map in docker

The methods to modify the port mapped by the Docker container are: restart the container with the --publish or -p flags and specify a new mapped port. Use Docker Compose to modify the ports section in the docker-compose.yml file. Modify port mappings using the cURL command via the Docker Engine API.

How to modify the port of Docker container map

Docker container map ports are the mechanism for associating internal ports of containers with host ports. To modify the port of the container map, you can take the following steps:

1. Determine the port map to modify

First, determine the container to modify and the host port it maps. The following commands can be used:

 <code>docker ps -a</code>

This lists all running and stopped containers. Find the container you want to modify and view the "PORTS" column for the current port map.

2. Restart the container and specify a new port map

Restart the container with -p --publish followed by the new port to be mapped. For example:

 <code>docker run -it --rm --name my-app -p 8081:80 my-app-image</code>

This command restarts the container named "my-app" and maps its internal port 80 to host port 8081.

3. Use docker-compose to modify port mapping

If you are using Docker Compose, you can modify the port mapping in the docker-compose.yml file. Find the ports section of the container you want to modify and specify a new host port. For example:

 <code class="yaml">services: my-app: image: my-app-image ports: - "8081:80"</code>

4. Use the Docker Engine API

Port mapping can also be modified through the Docker Engine API. The following cURL commands can be used:

 <code>curl -X POST \ -H "Content-Type: application/json" \ -d '{"ExposedPorts": {"80/tcp": {}}}' \ -H "Authorization: Bearer <access_token>" \ https://<docker_host>/containers/<container_id>/update</container_id></docker_host></access_token></code>

Note that <access_token></access_token> needs to be replaced with the access token of the Docker daemon, while <container_id></container_id> needs to be replaced with the container ID to be modified.

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