DevOps, Data Engineering

4 Docker Options You May Not Know

How to remove an image in Docker, rebuild an image from the base image, pass some configuration files to a Docker container, and run linux/amd64 images on linux/arm64 architecture.

In this short article, I take note of the following useful commands in Docker that I have discovered recently:

• Removing an image in Docker
• Rebuilding an image from the base image
• Passing some configuration files to a Docker container
• Attaching a terminal to a Docker container

Removing an image in Docker

You can remove a Docker image directly from Docker Desktop. However, sometimes, the image is running so you cannot remove that. Don’t worry! You can remove the image directly from the terminal as follows:

docker rmi -f <image_id>

You can take the image id from the Docker Desktop interface.

You can find more details in the Docker official documentation:

Rebuilding an image from the base image

If you want to rebuild an image from the base image, you should use the --no-cache option as follows:

docker build -t my_image .

You can find more details here:

Passing some configuration files to a Docker container

There are different ways to pass configuration files to a Docker container. Here, I suggest one possible solution, based on Docker Volumes, which permits you to map any directory in your file system to a directory in the Docker container:

docker run -v <source path>:<dest path>

You can find more details in the following article:

Attaching a terminal to a Docker container

If you want to run some command within a Docker container, you can run the following command:

docker exec -it <container_name> /bin/sh

The container must be running.

Running linux/amd64 images on linux/arm64 architecture

You can read this interesting thread on Reddit:

I have solved the problem, by using the following base image in Dockerfile:

FROM   amd64/centos:7

and then I have built the image as follows:

docker run --platform linux/amd64 --name my_container_name my_image

Summary

Congratulations! You have just learned some Docker options!

This article belongs to the Syntax Error Publication, which aims at solving your everyday issues as a developer.

If you have solved an issue and want to share how you solved it with the community, you can drop me a message and I’ll add you as a writer of the Syntax Error Publication :)

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