How to Install Docker on Rocky Linux 8 – Command line method

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In this blog, we will learn how to install docker on Rocky Linux 8 but before that lets gets into understanding what is this docker all about.

Introduction

Docker is an open platform for developing, shipping, and running applications. Docker enables you to separate your applications from your infrastructure so you can deliver software quickly. With Docker, you can manage your infrastructure in the same ways you manage your applications. By taking advantage of Docker’s methodologies for shipping, testing, and deploying code, you can significantly reduce the delay between writing code and running it in production.

Pre-requisite

A Rocky Linux 8 Host server with sudo privileges to the non-root user. To get with the installation you can refer our previous blog post How to Install Rocky Linux 8

Installing the docker

To get the latest docker packages installed we will configure the docker repo. Prior to that we will make sure our host system is updated 

$ sudo dnf check-update

Add the Docker official repository. Please note there is no Rocky Linux specific repository from Docker, Rocky Linux is based upon CentOS and can use the same repository. 

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

Install the docker packages 

$ sudo dnf install docker-ce docker-ce-cli containerd.io

Start the service 

$ sudo systemctl start docker

Verify if the services is running 

$ sudo systemctl status docker

Output : 

Output

● docker.service - Docker Application Container Engine

   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)

   Active: active (running) since Mon 2023-12-18 06:53:52 CDT; 1 weeks 3 days ago

     Docs: https://docs.docker.com

 Main PID: 552 (docker)

Make the service persistent across the reboot 

$ sudo systemctl enable docker

Configuring Non-root user for docker

Running the docker command requires root privileges — you will always have to prefix the command with sudo. But it is also possible to run as a normal non-root user if added to the docker group, which is automatically created during the installation of Docker. Let try to add the user to the required group 

$ sudo usermod -aG docker $(whoami)

Usage of the docker commands

Now that the docker has been installed and configured let us get familiar with the docker commands. Using the docker commands follow the below syntax

$ docker [option] [command] [arguments]

To view all available subcommands, type:

$ docker

Output : 

Output



    attach    Attach to a running container

    build     Build an image from a Dockerfile

    commit    Create a new image from a container's changes

    cp        Copy files/folders between a container and the local filesystem

    create    Create a new container

    diff      Inspect changes on a container's filesystem

    events    Get real time events from the server

    exec      Run a command in a running container

    export    Export a container's filesystem as a tar archive

    history   Show the history of an image

    images    List images

    import    Import the contents from a tarball to create a filesystem image

    info      Display system-wide information

    inspect   Return low-level information on a container or image

    kill      Kill a running container

    load      Load an image from a tar archive or STDIN

    login     Log in to a Docker registry

    logout    Log out from a Docker registry

    logs      Fetch the logs of a container

    network   Manage Docker networks

    pause     Pause all processes within a container

    port      List port mappings or a specific mapping for the CONTAINER

    ps        List containers

    pull      Pull an image or a repository from a registry

    push      Push an image or a repository to a registry

    rename    Rename a container

    restart   Restart a container

    rm        Remove one or more containers

    rmi       Remove one or more images

    run       Run a command in a new container

    save      Save one or more images to a tar archive

    search    Search the Docker Hub for images

    start     Start one or more stopped containers

    stats     Display a live stream of container(s) resource usage statistics

    stop      Stop a running container

    tag       Tag an image into a repository

    top       Display the running processes of a container

    unpause   Unpause all processes within a container

    update    Update configuration of one or more containers

    version   Show the Docker version information

    volume    Manage Docker volumes

    wait      Block until a container stops, then print its exit code

If you want to view the switches available to any specific command run : 

$ docker docker-subcommand --help

For viewing system-wide information, run:

$ docker info

For more information on docker installation & configuration you can always refer to their official website Get Docker

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