Docker Images - only name

Docker is an open-source tool designed to make it easy to create, deploy, and run applications by using containers. Docker containers are lightweight and efficient, allowing developers to build and ship their applications faster.

One of the key components of Docker is Docker images. Docker images are the building blocks of Docker containers, and they contain all the necessary files, libraries, and dependencies to run a specific program or set of programs.

In this tutorial, we will learn about Docker images and how to work with them using the Docker command-line interface (CLI).

What is a Docker Image?

A Docker image is a read-only template that contains a set of instructions for creating a Docker container. Docker images are created using a Dockerfile, which is a text file that contains the commands for building the image.

Docker images can be created from scratch, or they can be based on an existing image. When you create a Docker image, you specify the source code or application that you want to package, along with any dependencies that are required.

Working with Docker Images

To work with Docker images, you will need to have Docker installed on your system. Once Docker is installed, you can use the Docker CLI to manage your images.

Listing Docker Images

To list the Docker images that are currently available on your system, you can use the following command:

docker images

This will display a list of all the Docker images that are currently stored on your system, along with some additional information about each image.

Downloading Docker Images

If you want to download a Docker image from a registry, you can use the docker pull command. For example, to download the alpine image, you can use the following command:

docker pull alpine

This will download the alpine image from Docker Hub and store it on your system.

Building Docker Images

To build a Docker image, you will need to create a Dockerfile that contains the instructions for building the image. Once you have created the Dockerfile, you can use the docker build command to build the image.

For example, if you have a Dockerfile that contains the instructions for building a custom image for your application, you can use the following command to build the image:

docker build -t my-app .

This will build the Docker image from the Dockerfile located in the current directory and tag it with the name my-app.

Removing Docker Images

To remove a Docker image from your system, you can use the docker rmi command. For example, to remove the alpine image from your system, you can use the following command:

docker rmi alpine

This will remove the alpine image from your system.

Conclusion

Docker images are a crucial component of the Docker ecosystem. They provide a way to package and distribute applications and dependencies in a lightweight and efficient manner.

In this tutorial, we have learned about Docker images and how to work with them using the Docker CLI. We have covered how to list, download, build, and remove Docker images. With this knowledge, you should be able to start using Docker images in your own development projects.