How to Install Docker on Linux (AlmaLinux)
Docker is a tool for running container software. Leveraging containers is a terrific approach for developers and users to worry less about operating system compatibility and dependencies because the bundled software should function similarly on any system. Are you new to using a container engine? Be sure to check out the Docker for Beginners article, if you are just getting started.
AlmaLinux is an open-source enterprise-grade Linux distribution created as a 1:1 binary-compatible derivative of the Red Hat Enterprise Linux (RHEL) operating system. In this article, we'll teach you how to install Docker on Linux (AlmaLinux) and get started with containerized software.
Steps to Install Docker on Linux (AlmaLinux)
You can follow the steps outlined below to install Docker on Linux (AlmaLinux).
1. Ensure the Prerequisites are in Place
- Operating system and version: AlmaLinux OS 8.
- Use the sudo command as root to log into the AlmaLinux 8 system or log in as a user with admin rights.
- Kernel version: 3.10 or higher.
2. Update Your System
Before installing Docker on Linux (AlmaLinux), you will need to update your system's package repositories by using the following commands to ensure you're getting the latest versions of packages:
sudo dnf --refresh update
sudo dnf upgrade
3. Enable Docker Repository
You can install the yum-utils package using the following command, which provides the yum-config-manager utility to set up repositories:
sudo dnf install yum-utilsThen, you can add the Docker repository using yum-config-manager:
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo3. Install Docker on Linux (AlmaLinux) with the dnf Command
Then, you can use the following command to install the most recent version of Docker from the official repository:
sudo dnf install docker-ce docker-ce-cli containerd.io docker-compose-pluginHere is the output:
~]# sudo dnf install docker-ce docker-ce-cli containerd.io docker-compose-plugin
Docker CE Stable - x86_64 740 kB/s | 49 kB 00:00
Dependencies resolved.
=========================================================================================================================================================================
Package Architecture Version Repository Size
=========================================================================================================================================================================
Installing:
containerd.io x86_64 1.6.22-3.1.el8 docker-ce-stable 34 M
docker-ce x86_64 3:24.0.5-1.el8 docker-ce-stable 24 M
docker-ce-cli x86_64 1:24.0.5-1.el8 docker-ce-stable 7.2 M
docker-compose-plugin x86_64 2.20.2-1.el8 docker-ce-stable 13 M
Installing dependencies:
container-selinux noarch 2:2.205.0-2.module_el8.8.0+3557+7ba9cc13 appstream 63 k
docker-ce-rootless-extras x86_64 24.0.5-1.el8 docker-ce-stable 4.9 M
fuse-common x86_64 3.3.0-16.el8 baseos 21 k
fuse-overlayfs x86_64 1.11-1.module_el8.8.0+3557+7ba9cc13 appstream 73 k
fuse3 x86_64 3.3.0-16.el8 baseos 53 k
fuse3-libs x86_64 3.3.0-16.el8 baseos 94 k
iptables x86_64 1.8.4-24.el8 baseos 585 k
libcgroup x86_64 0.41-19.el8 baseos 69 k
libnetfilter_conntrack x86_64 1.0.6-5.el8 baseos 65 k
libnfnetlink x86_64 1.0.1-13.el8 baseos 33 k
libnftnl x86_64 1.1.5-5.el8 baseos 82 k
libslirp x86_64 4.4.0-1.module_el8.7.0+3407+95aa0ca9 appstream 69 k
policycoreutils-python-utils noarch 2.9-24.el8 baseos 253 k
slirp4netns x86_64 1.2.0-2.module_el8.7.0+3407+95aa0ca9 appstream 53 k
Installing weak dependencies:
docker-buildx-plugin x86_64 0.11.2-1.el8 docker-ce-stable 13 M
Enabling module streams:
container-tools rhel8
Transaction Summary
=========================================================================================================================================================================
Install 19 Packages
—-
—-
Importing GPG key 0x621E9F35:
Userid : "Docker Release (CE rpm) <docker@docker.com>"
Fingerprint: 060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35
From : https://download.docker.com/linux/centos/gpg
Is this ok [y/N]: y
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
—-
—-
Installed:
container-selinux-2:2.205.0-2.module_el8.8.0+3557+7ba9cc13.noarch containerd.io-1.6.22-3.1.el8.x86_64
docker-buildx-plugin-0.11.2-1.el8.x86_64 docker-ce-3:24.0.5-1.el8.x86_64
docker-ce-cli-1:24.0.5-1.el8.x86_64 docker-ce-rootless-extras-24.0.5-1.el8.x86_64
docker-compose-plugin-2.20.2-1.el8.x86_64 fuse-common-3.3.0-16.el8.x86_64
fuse-overlayfs-1.11-1.module_el8.8.0+3557+7ba9cc13.x86_64 fuse3-3.3.0-16.el8.x86_64
fuse3-libs-3.3.0-16.el8.x86_64 iptables-1.8.4-24.el8.x86_64
libcgroup-0.41-19.el8.x86_64 libnetfilter_conntrack-1.0.6-5.el8.x86_64
libnfnetlink-1.0.1-13.el8.x86_64 libnftnl-1.1.5-5.el8.x86_64
libslirp-4.4.0-1.module_el8.7.0+3407+95aa0ca9.x86_64 policycoreutils-python-utils-2.9-24.el8.noarch
slirp4netns-1.2.0-2.module_el8.7.0+3407+95aa0ca9.x86_64
Complete!4. Start & Enable Docker Service
Once Docker and its dependencies are installed, start and enable its service using the following commands:
sudo systemctl start docker
sudo systemctl enable dockerBy using the following command, you can see if the Docker service is running:
sudo systemctl status dockerHere is the output:
~]# sudo systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2023-08-17 07:50:43 UTC; 4min 40s ago
Docs: https://docs.docker.com
Main PID: 24759 (dockerd)
Tasks: 9
Memory: 34.7M
CGroup: /system.slice/docker.service
└─24759 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
Aug 17 07:50:43 ip-172-31-20-172.us-east-2.compute.internal systemd[1]: Starting Docker Application Container Engine...
Aug 17 07:50:43 ip-172-31-20-172.us-east-2.compute.internal dockerd[24759]: time="2023-08-17T07:50:43.206086907Z" level=info msg="Starting up"
Aug 17 07:50:43 ip-172-31-20-172.us-east-2.compute.internal dockerd[24759]: time="2023-08-17T07:50:43.235174640Z" level=info msg="Loading containers: start."
Aug 17 07:50:43 ip-172-31-20-172.us-east-2.compute.internal dockerd[24759]: time="2023-08-17T07:50:43.897941682Z" level=info msg="Loading containers: done."
Aug 17 07:50:43 ip-172-31-20-172.us-east-2.compute.internal dockerd[24759]: time="2023-08-17T07:50:43.921892106Z" level=info msg="Docker daemon" commit=a61e2b4 graphdri>
Aug 17 07:50:43 ip-172-31-20-172.us-east-2.compute.internal dockerd[24759]: time="2023-08-17T07:50:43.922270417Z" level=info msg="Daemon has completed initialization"
Aug 17 07:50:43 ip-172-31-20-172.us-east-2.compute.internal dockerd[24759]: time="2023-08-17T07:50:43.972878879Z" level=info msg="API listen on /run/docker.sock"
Aug 17 07:50:43 ip-172-31-20-172.us-east-2.compute.internal systemd[1]: Started Docker Application Container Engine.5. Check Docker Version
Next, use either of the following commands to check the Docker version:
sudo docker version
docker --version
Here is the output:
~]# sudo docker version
Client: Docker Engine - Community
Version: 24.0.5
API version: 1.43
Go version: go1.20.6
Git commit: ced0996
Built: Fri Jul 21 20:36:32 2023
OS/Arch: linux/amd64
Context: default
Server: Docker Engine - Community
Engine:
Version: 24.0.5
API version: 1.43 (minimum version 1.12)
Go version: go1.20.6
Git commit: a61e2b4
Built: Fri Jul 21 20:35:32 2023
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.6.22
GitCommit: 8165feabfdfe38c65b599c4993d227328c231fca
runc:
Version: 1.1.8
GitCommit: v1.1.8-0-g82f18fe
docker-init:
Version: 0.19.0
GitCommit: de40ad0
~]# docker --version
Docker version 24.0.5, build ced09966. Test Docker Installation
To test the installation, start a docker container with thehello-world image:
sudo docker run hello-worldHere is the output:
~]# sudo docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
719385e32844: Pull complete
Digest: sha256:dcba6daec718f547568c562956fa47e1b03673dd010fe6ee58ca806767031d1c
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/Congratulations! You have successfully completed the steps to Install Docker on Linux (AlmaLinux).
7. Add User to Docker User Group
You will be able to add your local user to the docker group so that the user can use docker commands without sudo:
Replace $USER as per your requirement. You can use the following command to see if your user is a member of the docker group:
id $USERHere is the output:
~]# sudo usermod -aG docker root
~]# id root
uid=0(root) gid=0(root) groups=0(root),991(docker)8. How to Uninstall Docker on AlmaLinux
You can use the following command to uninstall Docker from your AlmaLinux:
sudo dnf remove docker-ce docker-ce-cli containerd.io docker-compose-pluginHere is the output:
~]# sudo dnf remove docker-ce docker-ce-cli containerd.io docker-compose-plugin
Dependencies resolved.
=========================================================================================================================================================================
Package Architecture Version Repository Size
=========================================================================================================================================================================
Removing:
containerd.io x86_64 1.6.22-3.1.el8 @docker-ce-stable 114 M
docker-ce x86_64 3:24.0.5-1.el8 @docker-ce-stable 98 M
docker-ce-cli x86_64 1:24.0.5-1.el8 @docker-ce-stable 28 M
docker-compose-plugin x86_64 2.20.2-1.el8 @docker-ce-stable 58 M
Removing unused dependencies:
container-selinux noarch 2:2.205.0-2.module_el8.8.0+3557+7ba9cc13 @appstream 62 k
docker-buildx-plugin x86_64 0.11.2-1.el8 @docker-ce-stable 59 M
docker-ce-rootless-extras x86_64 24.0.5-1.el8 @docker-ce-stable 15 M
fuse-common x86_64 3.3.0-16.el8 @baseos 5.1 k
fuse-overlayfs x86_64 1.11-1.module_el8.8.0+3557+7ba9cc13 @appstream 145 k
fuse3 x86_64 3.3.0-16.el8 @baseos 100 k
fuse3-libs x86_64 3.3.0-16.el8 @baseos 274 k
iptables x86_64 1.8.4-24.el8 @baseos 1.9 M
libcgroup x86_64 0.41-19.el8 @baseos 136 k
libnetfilter_conntrack x86_64 1.0.6-5.el8 @baseos 161 k
libnfnetlink x86_64 1.0.1-13.el8 @baseos 51 k
libnftnl x86_64 1.1.5-5.el8 @baseos 217 k
libslirp x86_64 4.4.0-1.module_el8.7.0+3407+95aa0ca9 @appstream 134 k
policycoreutils-python-utils noarch 2.9-24.el8 @baseos 138 k
slirp4netns x86_64 1.2.0-2.module_el8.7.0+3407+95aa0ca9 @appstream 103 k
Transaction Summary
=========================================================================================================================================================================
Remove 19 Packages
---
---
Removed:
container-selinux-2:2.205.0-2.module_el8.8.0+3557+7ba9cc13.noarch containerd.io-1.6.22-3.1.el8.x86_64
docker-buildx-plugin-0.11.2-1.el8.x86_64 docker-ce-3:24.0.5-1.el8.x86_64
docker-ce-cli-1:24.0.5-1.el8.x86_64 docker-ce-rootless-extras-24.0.5-1.el8.x86_64
docker-compose-plugin-2.20.2-1.el8.x86_64 fuse-common-3.3.0-16.el8.x86_64
fuse-overlayfs-1.11-1.module_el8.8.0+3557+7ba9cc13.x86_64 fuse3-3.3.0-16.el8.x86_64
fuse3-libs-3.3.0-16.el8.x86_64 iptables-1.8.4-24.el8.x86_64
libcgroup-0.41-19.el8.x86_64 libnetfilter_conntrack-1.0.6-5.el8.x86_64
libnfnetlink-1.0.1-13.el8.x86_64 libnftnl-1.1.5-5.el8.x86_64
libslirp-4.4.0-1.module_el8.7.0+3407+95aa0ca9.x86_64 policycoreutils-python-utils-2.9-24.el8.noarch
slirp4netns-1.2.0-2.module_el8.7.0+3407+95aa0ca9.x86_64
Complete!Docker images, containers, volumes, or customized configuration files on your AlmaLinux system are not deleted automatically. You should manually delete all images, containers, and volumes using the following commands:
sudo rm -rf /var/lib/docker
sudo rm -rf /var/lib/containerdConclusion on how to install Docker on Linux (AlmaLinux) and obtain web hosting services from Liquid Web
Detailed knowledge of how to install Docker on Linux (AlmaLinux) was supplied in this knowledge base article. Of course, can quickly create, manage, and expand your container-based projects by combining the advantages of Docker with the dependability and experience of Liquid Web's hosting services.
If you're ready to embark on a Docker journey with AlmaLinux via a web hosting plan from Liquid Web, don't hesitate to contact us anytime.
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About the Author: Mohammed Noufal
Mohammed Noufal has worked as a senior server administrator for 8+ years. He can be found on LinkedIn to know more or connect.
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