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.
  • 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.repo

Build 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:     false

Docker 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:latest

List locally available docker images.

[root@docker-01 ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
alpine              latest              cc0abc535e36        23 hours ago        5.59MB

Create 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
/ # exit

Installing 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 --:--:--  276k

Grant execute permissions to docker-compose command.

[root@docker-01 ~]# chmod +x /usr/local/bin/docker-compose

Check 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 2019

We 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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