Docker is a set of Platform as a Service (PaaS) products that uses operating system level virtualizations to deliver software in the form of containers. Docker CE (Community Edition) is the strip down version of Docker EE (Enterprise Edition). Docker CE is free and open source and distributed under Apache License 2.0.
In Red Hat Enterprise Linux (RHEL) 8 / CentOS 8, Support of Docker has been removed by the vendor. Whereas a new containerization platform libpod (Podman’s Container Management Library) has been introduced inplace of Docker.
However, we can still install Docker and it’s dependencies on CentOS 8 / RHEL 8 from third party yum repositories.
In this article, we are installing Docker CE and docker-compose on CentOS 8.
Prerequisites
- You must have Alibaba Cloud Elastic Compute Service (ECS) activated and verified your valid payment method. If you are a new user, you can get $450 – $1300 worth in Alibaba Cloud credits for your new account. If you don’t know how to setup your ECS instance, you can refer to this tutorial or quick-start guide.
- A domain name registered from Alibaba Cloud. If you have already registered a domain from Alibaba Cloud or any other host, you can update its domain nameserver records.
- Domain name must be pointed to your Alibaba Cloud ECS’s IP address
- Access to VNC console in your Alibaba Cloud or SSH client installed in your PC
- Set up your server’s hostname and create a user with root privileges.
Environment Specification
We have configured a CentOS 8 virtual machine with following specifications.
- CPU – 3.4 Ghz (2 cores)
- Memory – 2 GB
- Storage – 40 GB
- Operating System – CentOS 8.0
- Hostname – docker-01.example.com
- IP Address – 192.168.116.6/24
Adding Docker CE yum Repository on CentOS 8:
Connect with docker-01.example.com using ssh as root user.
Docker CE is available to download from Docker’s Official Website However, we can also install it from Docker CE yum repository.
Add Docker CE yum repository using dnf command.
[root@docker-01 ~]# dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
Adding repo from: https://download.docker.com/linux/centos/docker-ce.repoBuild cache for Docker yum repository.
[root@docker-01 ~]# dnf makecache
CentOS-8 - AppStream 7.0 kB/s | 4.3 kB 00:00
CentOS-8 - Base 2.2 kB/s | 3.9 kB 00:01
CentOS-8 - Extras 1.7 kB/s | 1.5 kB 00:00
Docker CE Stable - x86_64 6.5 kB/s | 21 kB 00:03
Metadata cache created.Installing Docker CE on CentOS 8:
After addition of Docker CE yum repository, we can now easily install Docker CE on CentOS 8 by using a dnf command.
Docker CE requires containerd.io-1.2.2-3 (or later) package, which is blocked in CentOS 8. Therefore, we have to use an earlier version of containerd.io package.
Install docker-ce with an earlier version of containerd.io using following command.
[root@docker-01 ~]# dnf -y install --nobest docker-ce
Last metadata expiration check: 0:21:14 ago on Wed 25 Dec 2019 10:25:37 PM PKT.
Dependencies resolved.
Problem: package docker-ce-3:19.03.5-3.el7.x86_64 requires containerd.io >= 1.2.2-3, but none of the providers can be installed
- cannot install the best candidate for the job
- package containerd.io-1.2.10-3.2.el7.x86_64 is excluded
- package containerd.io-1.2.2-3.3.el7.x86_64 is excluded
- package containerd.io-1.2.2-3.el7.x86_64 is excluded
- package containerd.io-1.2.4-3.1.el7.x86_64 is excluded
- package containerd.io-1.2.5-3.1.el7.x86_64 is excluded
- package containerd.io-1.2.6-3.3.el7.x86_64 is excluded
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
docker-ce x86_64 3:18.09.1-3.el7 docker-ce-stable 19 M
Installing dependencies:
container-selinux noarch 2:2.94-1.git1e99f1d.module_el8.0.0+58+91b614e7
AppStream 43 k
checkpolicy x86_64 2.8-2.el8 BaseOS 338 k
libcgroup x86_64 0.41-19.el8 BaseOS 70 k
policycoreutils-python-utils noarch 2.8-16.1.el8 BaseOS 228 k
python3-audit x86_64 3.0-0.10.20180831git0047a6c.el8
BaseOS 85 k
python3-libsemanage x86_64 2.8-5.el8 BaseOS 127 k
python3-policycoreutils noarch 2.8-16.1.el8 BaseOS 2.2 M
python3-setools x86_64 4.2.0-2.el8 BaseOS 598 k
containerd.io x86_64 1.2.0-3.el7 docker-ce-stable 22 M
docker-ce-cli x86_64 1:19.03.5-3.el7 docker-ce-stable 39 M
Enabling module streams:
container-tools rhel8
Skipping packages with broken dependencies:
docker-ce x86_64 3:19.03.5-3.el7 docker-ce-stable 24 M
Transaction Summary
================================================================================
Install 11 Packages
Skip 1 Package
Total download size: 84 M
Installed size: 348 M
Downloading Packages:
(1/11): libcgroup-0.41-19.el8.x86_64.rpm 182 kB/s | 70 kB 00:00
(2/11): container-selinux-2.94-1.git1e99f1d.mod 108 kB/s | 43 kB 00:00
(3/11): python3-audit-3.0-0.10.20180831git0047a 102 kB/s | 85 kB 00:00
(4/11): policycoreutils-python-utils-2.8-16.1.e 132 kB/s | 228 kB 00:01
(5/11): python3-libsemanage-2.8-5.el8.x86_64.rp 106 kB/s | 127 kB 00:01
(6/11): checkpolicy-2.8-2.el8.x86_64.rpm 126 kB/s | 338 kB 00:02
(7/11): python3-setools-4.2.0-2.el8.x86_64.rpm 113 kB/s | 598 kB 00:05
(8/11): python3-policycoreutils-2.8-16.1.el8.no 109 kB/s | 2.2 MB 00:20
(9/11): docker-ce-18.09.1-3.el7.x86_64.rpm 75 kB/s | 19 MB 04:16
(10/11): containerd.io-1.2.0-3.el7.x86_64.rpm 80 kB/s | 22 MB 04:41
(11/11): docker-ce-cli-19.03.5-3.el7.x86_64.rpm 122 kB/s | 39 MB 05:31
--------------------------------------------------------------------------------
Total 240 kB/s | 84 MB 05:58
warning: /var/cache/dnf/docker-ce-stable-091d8a9c23201250/packages/containerd.io-1.2.0-3.el7.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY
Docker CE Stable - x86_64 1.5 kB/s | 1.6 kB 00:01
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
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : docker-ce-cli-1:19.03.5-3.el7.x86_64 1/11
Running scriptlet: docker-ce-cli-1:19.03.5-3.el7.x86_64 1/11
Installing : containerd.io-1.2.0-3.el7.x86_64 2/11
Running scriptlet: containerd.io-1.2.0-3.el7.x86_64 2/11
Installing : python3-setools-4.2.0-2.el8.x86_64 3/11
Installing : python3-libsemanage-2.8-5.el8.x86_64 4/11
Installing : python3-audit-3.0-0.10.20180831git0047a6c.el8.x86_ 5/11
Running scriptlet: libcgroup-0.41-19.el8.x86_64 6/11
Installing : libcgroup-0.41-19.el8.x86_64 6/11
Running scriptlet: libcgroup-0.41-19.el8.x86_64 6/11
Installing : checkpolicy-2.8-2.el8.x86_64 7/11
Installing : python3-policycoreutils-2.8-16.1.el8.noarch 8/11
Installing : policycoreutils-python-utils-2.8-16.1.el8.noarch 9/11
Installing : container-selinux-2:2.94-1.git1e99f1d.module_el8.0 10/11
Running scriptlet: container-selinux-2:2.94-1.git1e99f1d.module_el8.0 10/11
Running scriptlet: docker-ce-3:18.09.1-3.el7.x86_64 11/11
Installing : docker-ce-3:18.09.1-3.el7.x86_64 11/11
Running scriptlet: docker-ce-3:18.09.1-3.el7.x86_64 11/11
Verifying : container-selinux-2:2.94-1.git1e99f1d.module_el8.0 1/11
Verifying : checkpolicy-2.8-2.el8.x86_64 2/11
Verifying : libcgroup-0.41-19.el8.x86_64 3/11
Verifying : policycoreutils-python-utils-2.8-16.1.el8.noarch 4/11
Verifying : python3-audit-3.0-0.10.20180831git0047a6c.el8.x86_ 5/11
Verifying : python3-libsemanage-2.8-5.el8.x86_64 6/11
Verifying : python3-policycoreutils-2.8-16.1.el8.noarch 7/11
Verifying : python3-setools-4.2.0-2.el8.x86_64 8/11
Verifying : containerd.io-1.2.0-3.el7.x86_64 9/11
Verifying : docker-ce-3:18.09.1-3.el7.x86_64 10/11
Verifying : docker-ce-cli-1:19.03.5-3.el7.x86_64 11/11
Installed:
docker-ce-3:18.09.1-3.el7.x86_64
container-selinux-2:2.94-1.git1e99f1d.module_el8.0.0+58+91b614e7.noarch
checkpolicy-2.8-2.el8.x86_64
libcgroup-0.41-19.el8.x86_64
policycoreutils-python-utils-2.8-16.1.el8.noarch
python3-audit-3.0-0.10.20180831git0047a6c.el8.x86_64
python3-libsemanage-2.8-5.el8.x86_64
python3-policycoreutils-2.8-16.1.el8.noarch
python3-setools-4.2.0-2.el8.x86_64
containerd.io-1.2.0-3.el7.x86_64
docker-ce-cli-1:19.03.5-3.el7.x86_64
Skipped:
docker-ce-3:19.03.5-3.el7.x86_64
Complete!Enable and start Docker service.
[root@docker-01 ~]# systemctl enable --now docker.service
Created symlink /etc/systemd/system/multi-user.target.wants/docker.service â /usr/lib/systemd/system/docker.service.Check status of Docker service.
[root@docker-01 ~]# systemctl status docker.service
â docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor pres>
Active: active (running) since Wed 2019-12-25 22:56:45 PKT; 30s ago
Docs: https://docs.docker.com
Main PID: 3139 (dockerd)
Tasks: 17
Memory: 66.9M
CGroup: /system.slice/docker.service
ââ3139 /usr/bin/dockerd -H fd://
ââ3148 containerd --config /var/run/docker/containerd/containerd.tom>
Dec 25 22:56:43 docker-01.recipes.com dockerd[3139]: time="2019-12-25T22:56:43.>
Dec 25 22:56:43 docker-01.recipes.com dockerd[3139]: time="2019-12-25T22:56:43.>
Dec 25 22:56:43 docker-01.recipes.com dockerd[3139]: time="2019-12-25T22:56:43.>
Dec 25 22:56:43 docker-01.recipes.com dockerd[3139]: time="2019-12-25T22:56:43.>
Dec 25 22:56:44 docker-01.recipes.com dockerd[3139]: time="2019-12-25T22:56:44.>
Dec 25 22:56:44 docker-01.recipes.com dockerd[3139]: time="2019-12-25T22:56:44.>
Dec 25 22:56:45 docker-01.recipes.com dockerd[3139]: time="2019-12-25T22:56:45.>
Dec 25 22:56:45 docker-01.recipes.com dockerd[3139]: time="2019-12-25T22:56:45.>
Dec 25 22:56:45 docker-01.recipes.com dockerd[3139]: time="2019-12-25T22:56:45.>
Dec 25 22:56:45 docker-01.recipes.com systemd[1]: Started Docker Application Co>Check Docker version.
[root@docker-01 ~]# docker version
Client: Docker Engine - Community
Version: 19.03.5
API version: 1.39 (downgraded from 1.40)
Go version: go1.12.12
Git commit: 633a0ea
Built: Wed Nov 13 07:25:41 2019
OS/Arch: linux/amd64
Experimental: false
Server: Docker Engine - Community
Engine:
Version: 18.09.1
API version: 1.39 (minimum version 1.12)
Go version: go1.10.6
Git commit: 4c52b90
Built: Wed Jan 9 19:06:30 2019
OS/Arch: linux/amd64
Experimental: falseDocker CE has been installed on CentOS 8.
Create a Container using Docker in CentOS 8:
Let’s put Docker into action by creating a simple container.
For this purpose, we are using official image of Alpine Linux from Docker Hub.
[root@docker-01 ~]# docker search alpine --filter is-official=true
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
alpine A minimal Docker image based on Alpine Linux⦠5945 [OK]Pull Alpine Linux image from Docker Hub.
[root@docker-01 ~]# docker pull alpine
Using default tag: latest
latest: Pulling from library/alpine
e6b0cf9c0882: Pull complete
Digest: sha256:2171658620155679240babee0a7714f6509fae66898db422ad803b951257db78
Status: Downloaded newer image for alpine:latest
docker.io/library/alpine:latestList locally available docker images.
[root@docker-01 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
alpine latest cc0abc535e36 23 hours ago 5.59MBCreate and run a container using Alpine Linux image.
[root@docker-01 ~]# docker run -it --rm alpine /bin/sh
/ # cat /etc/os-release
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.11.2
PRETTY_NAME="Alpine Linux v3.11"
HOME_URL="https://alpinelinux.org/"
BUG_REPORT_URL="https://bugs.alpinelinux.org/"
/ # uname -a
Linux c0089c037e24 4.18.0-80.11.2.el8_0.x86_64 #1 SMP Tue Sep 24 11:32:19 UTC 2019 x86_64 Linux
/ # exitInstalling Docker-compose on CentOS 8:
Additionally, we are installing docker-compose on our CentOS 8 server, so we can create and run multiple containers as a single service.
Download docker-compose package from GitHub.
[root@docker-01 ~]# curl -L https://github.com/docker/compose/releases/download/1.25.1-rc1/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 617 0 617 0 0 546 0 --:--:-- 0:00:01 --:--:-- 546
100 16.2M 100 16.2M 0 0 184k 0 0:01:29 0:01:29 --:--:-- 276kGrant execute permissions to docker-compose command.
[root@docker-01 ~]# chmod +x /usr/local/bin/docker-composeCheck docker-compose version.
[root@docker-01 ~]# docker-compose version
docker-compose version 1.25.1-rc1, build d92e9bee
docker-py version: 4.1.0
CPython version: 3.7.4
OpenSSL version: OpenSSL 1.1.0l 10 Sep 2019We have successfully installed Docker CE and Docker-Compose on CentOS 8. We have only explored the installation of Docker CE here
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