How to access containers in docker

Docker is a popular container solution that makes it easier for developers to build, deploy, and manage applications. Docker leverages container technology to package an application and its required libraries, dependencies, and system tools into a portable container. This means developers can package and run their applications on any operating system, eliminating problems caused by local environment variables and saving development time.

However, sometimes we need to enter the Docker container to debug or manage applications. So, how should you access Docker containers? Here are some ways.

1. Use the docker exec command

Docker provides an exec command that can execute commands in a running container. Use this command to step directly into the container, just like in your local terminal. Enter the following command in the terminal:

$ docker exec -it [CONTAINER ID] /bin/bash

where [CONTAINER ID] is the ID of the container to enter. /bin/bash is the shell command to be executed in the container. The -it option instructs Docker to open a terminal using interactive and tty modes.

After using this command, we will enter the running container.

2. Use bind mount

Another way to access files in the container is through bind mount. This approach allows us to mount the host's directories into a Docker container and then access them within the container.

We can use the following command to bind and mount the host directory when starting the container:

$ docker run -it -v /host/dir:/container/dir image_name

This will mount the host directory /host/dir to the /container/dir directory in the container .

We can enter the container by executing the following command:

$ docker exec -it container_name /bin/bash

After entering the container, we can cd to the /container/dir directory to view the contents of the host directory.

3. Use Docker port mapping

Through Docker port mapping, we can map the host port to the container port. In this way, we can access the application in the running container on the local machine using a browser or other tools.

We can use the following command to map the host port 1234 to the container's port 80:

$ docker run -it -p 1234:80 image_name

After running this command, access localhost:1234 on the local machine to access the application in the container program.

The above are some methods of accessing Docker containers. Through these methods, we can better manage and debug our applications.

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