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Introduction
Docker is a platform for developing, delivering, and running applications in containers. Containers are lightweight and isolated environments that allow you to run applications on any operating system without the need for additional dependencies. In this article, we will explore the basics of Docker and demonstrate how to use it for application development.
Installing Docker
Before you can start using Docker, you need to install it on your system. Follow the instructions on the official Docker website Docker for detailed instructions for various operating systems.
Creating a Container
After installing Docker, you are ready to create your containers. To do this, you will need a Dockerfile that describes the steps to create the container. Here is an example of a simple Dockerfile:
FROM alpine:latest
ENTRYPOINT ["echo", "Hello world!"]
In this example, we use the base image Alpine and set the entrypoint command to echo "Hello world!".
Building the Container
To build the container image, execute the following command in the terminal:
docker build -t first_container:local .
This command will build a container image named first_container with the tag local based on the Dockerfile in the current directory.
Running the Container
After building the container, you can run it using the following command:
docker run --rm --name my_first_container first_container:local
This command will run the first_container:local container and execute the command specified in the Dockerfile’s entrypoint.
Working with the Container
After running the container, you can interact with it by opening a terminal inside the container or executing commands within it. To do this, use the command:
docker exec -it my_first_container ash
This command will open an interactive terminal inside the my_first_container container.
But in this case, it will not be possible to execute, as the container dies after executing the echo command. To launch an interactive shell in the container, the following command needs to be executed:
docker run --rm --entrypoint ash -ti first_container:local