100-Days-Of-DevOps-Challenge-KodeKloud

Setup Docker Installation

The Nautilus DevOps team aims to containerize various applications following a recent meeting with the application development team. They intend to conduct testing with the following steps:

• Install docker-ce and docker compose packages on App Server 2.
• Initiate the docker service.

Steps

1. Login into App server 2 and find out the linux distros

    cat /etc/os-release
    uname -a
   

    [steve@stapp02 ~]$ cat /etc/os-release 
    NAME="CentOS Stream"
    VERSION="9"
    ID="centos"
    ID_LIKE="rhel fedora"
    VERSION_ID="9"
    PLATFORM_ID="platform:el9"
    PRETTY_NAME="CentOS Stream 9"
    ANSI_COLOR="0;31"
    LOGO="fedora-logo-icon"
    CPE_NAME="cpe:/o:centos:centos:9"
    HOME_URL="https://centos.org/"
    BUG_REPORT_URL="https://issues.redhat.com/"
    REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux 9"
    REDHAT_SUPPORT_PRODUCT_VERSION="CentOS Stream"
   

   We can see it’s CentOS 9 os To install Docker on CentOS, follow the official docs

2. Available Methods

   You can install docker in many ways, like using RPM repository, downloading the docker package, or using a bash script. I would recommended to install using rpm repository, or using one script solution.

3. Install Using BASH Script

    curl -fsSL https://get.docker.com -o get-docker.sh
    sudo sh get-docker.sh
   

4. Enable Docker Service

    sudo systemctl enable docker.service
    sudo systemctl start docker.service
   

Good to Know?

Docker Fundamentals

• Containerization: Package applications with dependencies
• Images: Read-only templates for creating containers
• Containers: Running instances of Docker images
• Dockerfile: Text file with instructions to build images

Docker Architecture

• Docker Engine: Core runtime for containers
• Docker Daemon: Background service managing containers
• Docker CLI: Command-line interface for Docker
• Docker Registry: Store and distribute Docker images

Installation Methods

• Repository: Add Docker repo and install via package manager
• Package: Download and install .deb/.rpm packages
• Script: Automated installation script (convenience)
• Docker Desktop: GUI application for development

Key Benefits

• Portability: Run anywhere Docker is installed
• Consistency: Same environment across dev/test/prod
• Efficiency: Share OS kernel, lightweight
• Scalability: Easy horizontal scaling

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