Introduction to Docker

Docker is an open-source platform for containerization, which allows developers to package their applications and dependencies into portable containers. These containers are lightweight, isolated environments that can be easily distributed and deployed across different environments.

Benefits of Docker

1. Consistency: Docker ensures that your application runs consistently across different environments. By packaging all the necessary dependencies and configurations within the container, you eliminate the issue of "it works on my machine" and ensure that your application functions as intended in any environment.

2. Portability: Docker containers are self-contained units that can be easily moved between different systems and platforms. This enables seamless deployment and scaling of your applications across various environments, such as development, testing, and production.

3. Isolation: With Docker, each container provides isolation for your application and its dependencies. This isolation ensures that applications running within different containers do not interfere with each other, providing enhanced security and stability.

Getting Started with Docker

To get started with Docker, you first need to install Docker on your system. Follow the Docker installation guide for your specific operating system to install Docker.

Once Docker is installed, you can verify that it is working properly by running the following command in your terminal or command prompt:

1$ docker --version

This command will display the installed Docker version if everything is set up correctly.

Running Your First Docker Container

Now that Docker is set up on your system, let's run a basic Docker container. Open a terminal or command prompt and enter the following command:

1$ docker run hello-world

This command will download and run the "hello-world" Docker image, which is a simple container that outputs a "Hello from Docker!" message.

Congratulations! You have just run your first Docker container.

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class Main {

  public static void main(String[] args) {

    System.out.println("Hello, Docker!");

  }

}