How To Install and Use Docker on Ubuntu 20.04 Conclusion Want to learn more? Join the DigitalOcean Community! Still looking for an answer?

I have a brand new droplet and there appears to be something wrong with the “stable” release using these instructions. When I run sudo systemctl status docker I get a bunch of error and it throws me into Vi:

● docker.service - Docker Application Container Engine
     Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
     Active: active (running) since Tue 2020-06-23 20:47:38 AEST; 15s ago
TriggeredBy: ● docker.socket
       Docs: https://docs.docker.com
   Main PID: 20339 (dockerd)
      Tasks: 8
     Memory: 34.7M
     CGroup: /system.slice/docker.service
             └─20339 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

Jun 23 20:47:38 projects dockerd[20339]: time="2020-06-23T20:47:38.156277373+10:00" level=warning msg="Your kernel does not support cgroup rt runtime"
Jun 23 20:47:38 projects dockerd[20339]: time="2020-06-23T20:47:38.156436943+10:00" level=warning msg="Your kernel does not support cgroup blkio weigh>
Jun 23 20:47:38 projects dockerd[20339]: time="2020-06-23T20:47:38.156588335+10:00" level=warning msg="Your kernel does not support cgroup blkio weigh>
Jun 23 20:47:38 projects dockerd[20339]: time="2020-06-23T20:47:38.156960819+10:00" level=info msg="Loading containers: start."
Jun 23 20:47:38 projects dockerd[20339]: time="2020-06-23T20:47:38.420014263+10:00" level=info msg="Default bridge (docker0) is assigned with an IP ad>
Jun 23 20:47:38 projects dockerd[20339]: time="2020-06-23T20:47:38.643617453+10:00" level=info msg="Loading containers: done."
Jun 23 20:47:38 projects dockerd[20339]: time="2020-06-23T20:47:38.729797979+10:00" level=info msg="Docker daemon" commit=48a66213fe graphdriver(s)=ov>
Jun 23 20:47:38 projects dockerd[20339]: time="2020-06-23T20:47:38.730768864+10:00" level=info msg="Daemon has completed initialization"
Jun 23 20:47:38 projects systemd[1]: Started Docker Application Container Engine.
Jun 23 20:47:38 projects dockerd[20339]: time="2020-06-23T20:47:38.776191749+10:00" level=info msg="API listen on /run/docker.sock"

How To Install and Use Docker on Ubuntu 20.04 Step 8 — Pushing Docker Images to a Docker Repository

Note: If your Docker registry username is different from the local username you used to create the image, you will have to tag your image with your registry username. For the example given in the last step, you would type:

docker tag sammy/ubuntu-nodejs docker-registry-username/ubuntu-nodejs

How To Install and Use Docker on Ubuntu 20.04 Step 8 — Pushing Docker Images to a Docker Repository

To push the ubuntu-nodejs image to the sammy repository, the command would be:

docker push sammy/ubuntu-nodejs

How To Install and Use Docker on Ubuntu 20.04 Step 8 — Pushing Docker Images to a Docker Repository

To push your image, first log into Docker Hub.

docker login -u docker-registry-username

How To Install and Use Docker on Ubuntu 20.04 Step 1 — Installing Docker

The output should be similar to the following, showing that the service is active and running:

Output● docker.service - Docker Application Container Engine
     Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
     Active: active (running) since Tue 2020-05-19 17:00:41 UTC; 17s ago
TriggeredBy: ● docker.socket
       Docs: https://docs.docker.com
   Main PID: 24321 (dockerd)
      Tasks: 8
     Memory: 46.4M
     CGroup: /system.slice/docker.service
             └─24321 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

How To Install and Use Docker on Ubuntu 20.04 Step 8 — Pushing Docker Images to a Docker Repository

Then you may push your own image using:

docker push docker-registry-username/docker-image-name

How To Install and Use Docker on Ubuntu 20.04 Step 8 — Pushing Docker Images to a Docker Repository

The process may take some time to complete as it uploads the images, but when completed, the output will look like this:

OutputThe push refers to a repository [docker.io/sammy/ubuntu-nodejs]
e3fbbfb44187: Pushed
5f70bf18a086: Pushed
a3b5c80a4eba: Pushed
7f18b442972b: Pushed
3ce512daaf78: Pushed
7aae4540b42d: Pushed

...

How To Install and Use Docker on Ubuntu 20.04 Step 8 — Pushing Docker Images to a Docker Repository

If a push attempt results in an error of this sort, then you likely did not log in:

OutputThe push refers to a repository [docker.io/sammy/ubuntu-nodejs]
e3fbbfb44187: Preparing
5f70bf18a086: Preparing
a3b5c80a4eba: Preparing
7f18b442972b: Preparing
3ce512daaf78: Preparing
7aae4540b42d: Waiting
unauthorized: authentication required

How To Install and Use Docker Compose on Ubuntu 20.04 Step 2 — Setting Up a docker-compose.yml File

~/compose-demo/app/index.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Docker Compose Demo</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/kognise/water.css@latest/dist/dark.min.css">
</head>
<body>

    <h1>This is a Docker Compose Demo Page.</h1>
    <p>This content is being served by an Nginx container.</p>

</body>
</html>

How To Install and Use Docker on Ubuntu 20.04 Step 6 — Managing Docker Containers

You’ll see output similar to this:

1c08a7a0d0e4        ubuntu              "/bin/bash"         2 minutes ago       Exited (0) 8 seconds ago                       quizzical_mcnulty
a707221a5f6c        hello-world         "/hello"            6 minutes ago       Exited (0) 6 minutes ago                       youthful_curie

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