Creating a Docker image

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Updated at September 23, 2024

The guide describes how to create and build a Docker image from a Dockerfile.

To work with Docker images, install and configure Docker.

CLI

Create a file named Dockerfile on your device and add the below lines to it:
```
FROM ubuntu:latest
CMD echo "Hi, I'm inside"
```
The described Docker image is based on Ubuntu and will execute one simple command.
Assemble the Docker image. As the <registry_ID> use the ID you got when creating the registry.
```
docker build . \
  -t cr.yandex/<registry_ID>/ubuntu:hello
```
The -t flag assigns a URL to the Docker image in this format: cr.yandex/<registry_ID>/<Docker_image_name>:<tag>. You can build Docker images without any tag. In this case, the Docker CLI will provide the default label: latest.

Once these commands are executed, a Docker image will be created in your repository with the hello tag and the full address of the repository, which includes:

Container Registry address: cr.yandex.
Your registry ID (<registry_ID>).
Name of your ubuntu repository.

Creating a Docker image

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