Question

how to install docker on centos?

Answer 1

Pre-requisites:

• You must have the "centos-extras" repository enabled. 
• You must have Super-user access ( sudo )
• You will the need the "yum" package installer

Installation Steps:

Step 0: ( optional )

Uninstall any old versions of docker you may have using the below command:

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

Step 1: 

Allow for the docker package database to be up to date.

$ sudo yum check-update

Step 2:

Install all of the necessary packages:

$ sudo yum install -y yum-utils \
  device-mapper-persistent-data \
  lvm2

Step 3:

Setup a stable repository for docker, this is so that you can later update docker from this repository when needed:

$ sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

 Step 4:

Now go ahead an install docker properly using the below command, it will install all the important docker components:

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

You may be asked validate the installation by giving you a GPG key, It should look something like this:

060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35 

You have now successfully installed Docker. The END. 

Hope this helped :)

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