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Install Docker Packages.md

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Problem Description

The Nautilus DevOps team is preparing to containerize various applications. Following a recent meeting with the application development team, the goal is to set up Docker on App Server 2 for testing purposes. This includes:

  • Installing docker-ce and docker-compose packages.
  • Starting the Docker service to ensure it is operational.

Solution

1. Install yum-utils

First, install yum-utils, which provides utilities to manage Yum repositories and packages.

sudo yum install -y yum-utils

2. Install Docker Packages

Add the Docker repository to the Yum package manager, and then install Docker and Docker Compose packages.

  • Add Docker Repository

    sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

    This command configures Yum to use the Docker repository for installation.

  • Install Docker and Docker Compose

    sudo yum install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

    This command installs the following packages:

    • docker-ce: Docker Community Edition
    • docker-ce-cli: Docker command-line interface
    • containerd.io: Containerd runtime
    • docker-buildx-plugin: Docker buildx plugin for advanced build capabilities
    • docker-compose-plugin: Docker Compose plugin for defining and running multi-container applications

3. Start the Docker Service

Start the Docker service to initialize Docker and enable it to start automatically on system boot.

sudo systemctl start docker

  • Enable Docker to Start at Boot

    Optionally, you can enable Docker to start automatically on boot by running:

    sudo systemctl enable docker

4. Verify Docker Installation

To confirm that Docker is installed correctly and the service is running, execute a test container.

sudo docker run hello-world

This command runs the hello-world Docker image, which outputs a message indicating that Docker is working correctly. The expected output should include a message like:

Hello from Docker!
This message shows that your installation appears to be working correctly.