Getting Started with Docker

Docker is a powerful tool for containerization that allows you to package your applications and their dependencies into portable containers. In this section, we will walk through the process of installing Docker and running our first container.

Installing Docker

Before we can start using Docker, we need to install it on our system. Docker provides installation packages for different operating systems, including Windows, macOS, and Linux.

To install Docker on your system, follow the official Docker documentation for your specific operating system. Once the installation is complete, you can verify the installation by running the following command in your terminal or command prompt:

1$ docker --version

This command will display the installed Docker version if the installation was successful.

Running Your First Container

Now that Docker is installed on your system, let's run our first container. We will start with a simple Java program that prints "Hello World!".

In a text editor, create a new file called Main.java and add the following code:

1<<code>>

Save the file and navigate to the directory where the file is saved using the terminal or command prompt. Run the following command to compile the Java program:

1$ javac Main.java

This command will compile the Java program and generate a Main.class file. Now, let's create a Docker image for our Java program using the following command:

1$ docker build -t java-app .

The -t flag is used to provide a name for the Docker image, and the . at the end specifies the current directory as the build context. Docker will look for a Dockerfile in the current directory to build the image.

Once the Docker image is built, we can run a container from it using the following command:

1$ docker run java-app

This command will start a container from the java-app image and execute the Java program, which will print "Hello World!" to the console.

Congratulations! You have successfully installed Docker and ran your first container. In the next sections, we will explore more advanced features and concepts of Docker.

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class Main {

    public static void main(String[] args) {

        System.out.println("Hello World!");

    }

}