learn devops

May 12, 2020

Docker is replacing virtual machines Docker can be used with VM’s on large projects

Hypervisors eg. vmware ESX1

How docker works Hardware - One Os(eg Ubuntu) - Docker - Other Os to create containers

Containers - are fast virtual lightweight isolated micro-computers environments. They run instances of images. Docker image is a package or a template.

How to use:

Install docker
Pull an image

    $docker pull centos
    $docker pull centos/version:number //get specific version of an image

Run a Container

    $docker run -d -t --name container_name centos
    $docker run -d -t -p 80:80 -name container_name centos/version:number //run docker image on your website

Check your your running containers

    $docker ps

Connect to your docker container

    $docker exec -it container_name bash

Stop running docker container

    $docker stop container_name

Start running docker container

    $docker start container_name

Check resources being used

    $docker stats

Why docker is cool:

You only need one kernel
They are lightweight