Detailed steps to install docker in 5 minutes

Installing Docker on CentOS requires the operating system to be CentOS 7 or 8, and the centos extras repository must be enabled. This repository is enabled by default, but if you have disabled it, you will need to re-enable it.

Uninstall old versions

Older versions of docker are called docker or docker-engine. If you have an older version of docker, uninstall it and its dependencies.

$ remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine

Installation Steps

The official recommendation is to install by setting up a docker repository, which is simpler to install and upgrade.

1 Set up the docker repository

When installing for the first time, you need to set up a docker repository, and then you can use the repository to install and upgrade docker.

You need to install the yum-utils package first, which provides the yum-config-manager tool and a stable repository.

yum install -y yum-utils
 yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

2 Install Docker Engine

Install the latest version of Docker engine and container, or go to the next step to set up a version installation:

$ yum install docker-ce docker-ce-cli containerd.io

If prompted to accept the GPG key, verify that it is 060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35 , if so, accept it.

If multiple Docker repositories are enabled, installing or updating without specifying a version in the yum install or yum update command always installs the highest version available, which might not be appropriate for your stability needs.

The above command installs the latest version of docker, but does not start the service. The docker group is also created, but no user is assigned to the group.

3 Install the specified version of the docker engine

List all versions available in the repository, and then choose to install them. The following command sorts the results in reverse order:

[root@iZbp180j96p8y98l1s1oucZ ~]# yum list docker-ce --showduplicates | sort -r
Last metadata expiration check: 0:32:38 ago on Fri 28 May 2021 06:17:26 PM CST.
Installed Packages
docker-ce.x86_64 3:20.10.6-3.el8 docker-ce-stable 
docker-ce.x86_64 3:20.10.6-3.el8 @docker-ce-stable
docker-ce.x86_64 3:20.10.5-3.el8 docker-ce-stable 
docker-ce.x86_64 3:20.10.4-3.el8 docker-ce-stable 
docker-ce.x86_64 3:20.10.3-3.el8 docker-ce-stable 
docker-ce.x86_64 3:20.10.2-3.el8 docker-ce-stable 
docker-ce.x86_64 3:20.10.1-3.el8 docker-ce-stable 
docker-ce.x86_64 3:20.10.0-3.el8 docker-ce-stable 
docker-ce.x86_64 3:19.03.15-3.el8 docker-ce-stable 
docker-ce.x86_64 3:19.03.14-3.el8 docker-ce-stable 
docker-ce.x86_64 3:19.03.13-3.el8 docker-ce-stable 
Available Packages

Use the following command to specify the version to be installed. For example, for 3:20.10.6-3.el8 , its version number is the part between : and - , that is: 20.10.6

$ yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io

Substitute the version number, and the command above will be:

$ yum install docker-ce-20.10.6 docker-ce-cli-20.10.6 containerd.io

4 Start Docker

$ systemctl start docker

5 Run hello-world
To verify that Docker is installed correctly and started normally, execute the built-in hello-world image.

$ docker container run hello-world

If the hello-world image does not exist by default, it will be automatically downloaded and then run.

The above is the detailed content of the 5-minute installation tutorial of Docker. For more information about the Docker installation tutorial, please pay attention to other related articles on 123WORDPRESS.COM!