How to Install Docker and Docker Compose on Rocky Linux 8

Docker is a free and open-source tool that allows you to build and run containers on your Linux system. It allows you to create lightweight and portable application images that run on any platform.

Docker Compose is a free and open-source tool that allows you to define, visualize, and run multiple applications in a containerized environment. It uses a YAML file to define different applications and services. After defining the services in the YAML file, you can start all of them using a single command.

In this post, we will show you how to install Docker and Docker Compose in Rocky Linux 8.

Step 1 – Install Docker CE

By default, the Docker package is not included in the RockyLinux default repository, so you will need to create a Docker CE repo.

You can create it using the following commands:

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

Next, install Docker CE by running the following command:

dnf install docker-ce -y

Once Docker is installed, start the Docker service and enable it to start at system reboot.

systemctl start docker
systemctl enable docker

You can verify the status of the Docker service using the following command:

systemctl status docker

Sample output:

● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: active (running) since Tue 2021-10-12 14:32:46 UTC; 3s ago
     Docs: https://docs.docker.com
 Main PID: 10474 (dockerd)
    Tasks: 8
   Memory: 32.0M
   CGroup: /system.slice/docker.service
           └─10474 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

Oct 12 14:32:45 RockyLinux8 dockerd[10474]: time="2021-10-12T14:32:45.723802786Z" level=error msg="Failed to built-in GetDriver graph btrfs /v>
Oct 12 14:32:46 RockyLinux8 dockerd[10474]: time="2021-10-12T14:32:46.156090877Z" level=warning msg="Your kernel does not support cgroup blkio>
Oct 12 14:32:46 RockyLinux8 dockerd[10474]: time="2021-10-12T14:32:46.156145109Z" level=warning msg="Your kernel does not support cgroup blkio>
Oct 12 14:32:46 RockyLinux8 dockerd[10474]: time="2021-10-12T14:32:46.156457478Z" level=info msg="Loading containers: start."
Oct 12 14:32:46 RockyLinux8 dockerd[10474]: time="2021-10-12T14:32:46.573226503Z" level=info msg="Default bridge (docker0) is assigned with an>
Oct 12 14:32:46 RockyLinux8 dockerd[10474]: time="2021-10-12T14:32:46.742379418Z" level=info msg="Loading containers: done."
Oct 12 14:32:46 RockyLinux8 dockerd[10474]: time="2021-10-12T14:32:46.771012571Z" level=info msg="Docker daemon" commit=79ea9d3 graphdriver(s)>
Oct 12 14:32:46 RockyLinux8 dockerd[10474]: time="2021-10-12T14:32:46.771196748Z" level=info msg="Daemon has completed initialization"
Oct 12 14:32:46 RockyLinux8 systemd[1]: Started Docker Application Container Engine.
Oct 12 14:32:46 RockyLinux8 dockerd[10474]: time="2021-10-12T14:32:46.808331498Z" level=info msg="API listen on /var/run/docker.sock"

To verify the Docker version with additional information, run the following command:

docker info

You will get the following output:

Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Build with BuildKit (Docker Inc., v0.6.3-docker)
  scan: Docker Scan (Docker Inc., v0.8.0)

Server:
 Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 0
 Server Version: 20.10.9
 Storage Driver: overlay2
  Backing Filesystem: xfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 5b46e404f6b9f661a205e28d59c982d3634148f8
 runc version: v1.0.2-0-g52b36a2
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 4.18.0-305.7.1.el8_4.x86_64
 Operating System: Rocky Linux 8.4 (Green Obsidian)
 OSType: linux
 Architecture: x86_64
 CPUs: 2
 Total Memory: 3.649GiB
 Name: RockyLinux8
 ID: QF4C:I2ML:INX7:RKY7:2X5A:YEQB:UJJW:LS35:LPMZ:LIKS:2WB2:P33U
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

Step 2 – Verify Docker Installation

After installing Docker, you will need to test whether it’s working.

You can use Docker’s hello-world container to test Docker.

docker run hello-world

This will download the hello-world docker image to your system:

Unable to find image 'hello-world:latest' locally

latest: Pulling from library/hello-world
2db29710123e: Pull complete 
Digest: sha256:9ade9cc2e26189a19c2e8854b9c8f1e14829b51c55a630ee675a5a9540ef6ccf
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

You can verify the downloaded image using the following command:

docker images

You will get the following output:

REPOSITORY    TAG       IMAGE ID       CREATED       SIZE
hello-world   latest    feb5d9fea6a5   2 weeks ago   13.3kB

Step 3 – Install Docker Compose

By default, the latest version of Docker Compose is not available in the Rocky Linux default repository, so you will need to download its binary to your system.

First, install the curl command utility with the following command:

dnf install -y curl

Next, download the latest version of Docker Compose with the following command:

curl -L https://github.com/docker/compose/releases/download/v2.0.1/docker-compose-linux-x86_64 -o /usr/local/bin/docker-compose

Next, set executable permissions on the Docker Compose binary:

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

Next, verify the Docker Compose version using the following command:

docker-compose --version

You will get the following output:

Docker Compose version v2.0.1

Step 4 – Remove Docker and Docker Compose

If you want to remove the Docker package from your system, first stop the Docker service using the following command:

systemctl stop docker

Next, remove the Docker package using the following command:

dnf remove docker-ce -y

To remove Docker Compose, delete the Docker Compose binary using the following command:

rm -rf /usr/local/bin/docker-compose

Conclusion

In the above guide, we explained how to install Docker and Docker Compose on RockyLinux 8. You can now start creating a YAML for your application and deploy it in the containerized environment. Give it a try on your dedicated server from Atlantic.Net!