How To Install Docker on Ubuntu 18.04

Note:- To install docker on ubuntu 18.04, you need ubuntu 18.04 with 64-bit system.

Step 1 : Uninstall older version if installed already

Docker or docker-engine are the older versions of dockers. If any of these versions are installed in the system, let uninstall them first.

Note:- The docker community package (docker-ce) is now called as docker-ce. docker-ce means docker community edition.

Enter below command on your ubuntu terminal in order to uninstall any older version of docker.

$ sudo apt-get remove docker docker-engine docker.io

Step 2 : Setting up repository for the docker

For updating the ubuntu package. Please run below command

$ sudo apt-get update

Run below command which is used to installing curl and allow apt to use a repository over https

$ sudo apt-get install apt-transport-https ca-certificates curl software-properties-common

Now add the docker GPG key for the official docker repository in your system using the below command

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

Verify added key to the system.

Please run below command in terminal for searching the last 8 characters of the fingerprint in order to verify that now we have key with the finger print 9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88.

$ sudo apt-key fingerprint 0EBFCD88

Add into apt repository

$ sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

Step 3 : Install docker-ce to the system

first update the apt package

$ sudo apt-get update

To install the latest version of docker please run

$ sudo apt-get install docker-ce

It will install docker and will start the docker daemon automatically.

Now docker install is complete and we should have docker running on our system.

Step 4 : check if docker running on system

We have installed the docker in our system, now check what is the status of docker using the below command

$ sudo systemctl status docker

Step 5 : check docker version

Check docker version and detailed info about docker using the below commands

$ sudo docker --version

$ sudo docker version

$ sudo docker info

$ sudo systemctl stop docker

$ sudo systemctl start docker

$ sudo apt-get purge docker-ce

$ sudo rm -rf /var/lib/docker