4_Docker_Installation

Install Docker on Ubuntu Linux

Way 1: Unofficial docker.io package

1. Go to root folder with root priviliges

2. Update and upgrade

$ sudo apt-get update && sudo apt-get upgrade

3. Uninstall Old Docker version

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

4. Install Docker

$ sudo apt install docker.io

5. Start and configure docker

$ sudo systemctl start docker
$ sudo systemctl enable docker

6. Check docker version to verify installation

$ docker --version

7. Run Hello World container to verify successfull installation of client, daemon etc.

$ docker run hello-world

Note: Run Ubuntu bash using:

$ docker run -it ubuntu bash

Way 2: Official Docker registry installation

1. Ensure the downloads are valid, add the GPG key for the official Docker repository to your system:

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

2. Add the Docker repository to APT sources:

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

3. Update the package database with the Docker packages from the newly added repo:

$ sudo apt-get update

4. Make sure you are about to install from the Docker repo instead of the default Ubuntu 18.04 repo:

$ apt-cache policy docker-ce

5. Install Docker engine:

$ sudo apt-get install -y docker-ce

6. Verify Docker Installtion

$ sudosystemctl status docker