Docker (not Podman) & Docker compose for Oracle Compute

A blog for this? surely it's just the command below, right?

# Don't actually run this
# sudo dnf install docker

No, it doesn't. Because this command installs Oracle's flavour of Docker called podman-docker. Here is proof:

Podman might be fine for you, however, I had a problem where Podman containers could not resolve each other by container name. So instead of Podman, this blog is all about the installation of Docker-ce. Also known as Docker Community Edition & as a bonus we are going to get docker-compose running as an executable.

Docker compose is already supplied by Docker-ce as a plugin, but hey, I like the docker-compose command.

Install docker-ce

1. Add centos repository and install docker-ce

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

2. Start Docker

    sudo systemctl start docker
    sudo systemctl enable docker
   

3. Allow docker to use reserved ports

    sudo groupadd docker
    sudo service docker restart
    sudo usermod -a -G docker opc
   

4. IMPORTANT: Exit the session and start a new session

    exit
   

5. Check Docker version

    docker --version
   

Install docker-compose

1. Run the following

    sudo curl -L https://github.com/docker/compose/releases/download/v2.22.0/docker-compose-linux-x86_64 -o /usr/local/bin/docker-compose
    sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose
    sudo chmod +x /usr/local/bin/docker-compose
   

2. Check Docker version

    docker-compose --version
   

Test it out

1. Get a Hello World example running on port 80

    docker run -P -d -p 80:80 --name hello_port_eighty nginxdemos/hello
   

2. Wait 5 seconds and then type

    curl http://localhost:80
    docker rm -f hello_port_eighty
    docker rmi nginxdemos/hello
   

3. If it worked, you should see the raw HTML from port 80. It looks a bit like this

    <p><span>Server&nbsp;address:</span> <span>172.17.0.2:80</span></p>
    <p><span>Server&nbsp;name:</span> <span>71357de631fa</span></p>
    <p class="smaller"><span>Date:</span> <span>09/Oct/2023:16:28:20 +0000</span></p>
    <p class="smaller"><span>URI:</span> <span>/</span></p>
    </div>
    <div class="check"><input type="checkbox" id="check" onchange="changeCookie()"> Auto Refresh</div>
        <div id="footer">
            <div id="center" align="center">
                Request ID: c537f746356ac1ababdd362f2cea36c6<br/>
                &copy; NGINX, Inc. 2018
            </div>
        </div>
    </body>
    </html>
   

ENJOY!

What's the picture? It's the village of Ripley. Visit Yorkshire!