Docker (not Podman) & Docker compose for Oracle Compute

Docker (not Podman) & Docker compose for Oracle Compute

Matt Mulvaney's photo
Matt Mulvaney
·

2 min read

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!

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