Docker Engine and Compose Install Centos 8

updated: 9th of December 2020

published: 7th of December 2020

Intro

Docker and docker-compose are a very common tools for developing and deploying applications.

In this post I will cover the process of installing Docker engine and Docker compose on Centos 8 minimal.

Software Versions Used In This Post

Centos Minimal - 8.2.2004
Docker Engine CE - 19.03.14
Docker Compose - 1.27.4

Pre-Flight Check

Ensure that there are no default versions of Docker install. There should not be, but it's worth confirming.

    cmd
  
    rpm -qa | grep docker

Docker Install

Add the Docker community edition repository.

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

Install Docker, the CLI tools and containerd.

    cmd
  
    sudo dnf install -y docker-ce docker-ce-cli containerd.io

Start and enable Docker.

    cmd
  
    sudo systemctl start docker
sudo systemctl enable docker

Add the docker0 interface to the trusted zone in firewalld .

Important

This allows containers to resolve hostnames to IP addresses. Without it, any thing that relies on name resolution will not work.

    cmd
  
    sudo firewall-cmd --permanent --zone=trusted --add-interface=docker0
sudo firewall-cmd --reload

Add your user to docker group.

    cmd
  
    sudo usermod -aG docker $USER

Now logout and log back in or run the newgrp docker command.

Verify Docker Install

Confirm that you can run docker commands.

    cmd
  

    docker pull hello-world

# Output

Using default tag: latest
latest: Pulling from library/hello-world
0e03bdcc26d7: Pull complete 
Digest: sha256:e7c70bb24b462baa86c102610182e3efcb12a04854e8c582838d92970a09f323
Status: Downloaded newer image for hello-world:latest
docker.io/library/hello-world:latest
  

Docker Compose Install

Install the docker-compose binary from the Github release page.

    cmd
  
    sudo curl -L "https://github.com/docker/compose/releases/download/1.27.4/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

Make the docker-compose binary executable.

    cmd
  
    sudo chmod +x /usr/local/bin/docker-compose

Symlink the docker-compose binary into a location in your $PATH .

    cmd
  
    sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose

Update the docker-compose binaries permissions.

    cmd
  
    sudo chgrp docker /usr/local/bin/docker-compose
sudo chmod 750 /usr/local/bin/docker-compose

Verify Docker Compose Install

Confirm that you can run docker-compose commands.

    cmd
  
    docker-compose --version

# Output

docker-compose version 1.27.4, build 40524192

Outro

This post covered the process of installing Docker engine and Docker compose on Centos 8 Minimal.