Basic of Docker

To use docker for your project you will need to know few things:

1. Pull Docker image: Its an Operating system image placed on Docker repository which you can pull into your machine.
2. Create Contianer: Its a process of using the image you have downloaded and making it a runnable virtual machine.
3. Run Contianer: To run an instance of the container OS.
4. Expose Contianer: It allows you to access running contianer elements like ports/volume/terminal from host machine.

Create a docker container (Full Command way)

Pull Docker image:

docker pull image_repo_name:tag

You can go here https://hub.docker.com/search/?type=image to grab an image of OS required for your poject. Lets say I want to run a webserver, in that case I can use apache image as docker pull httpd:latest where httpd is the repo name and latest is the tag or version.

Create a Contianer

docker --create --name containerName image_repo_name:tag

For example if I like to create a container with apache then docker --create --name mywebserver apache:latest

Run Container

docker run -it --name containerName

Expose Contianer

docker run -it --name containerName -p 80:80 -v ./myfolder:/var/www/html

Where p means publish but you can think it as a host vs guest port mapping. Here I am mapping host port 80 wuth guest/container port 80 -v denotes volume and we map host and container volumes.

Other useful commands

List

To start an existing container docker start containerID To stop an existing container docker stop containerID To list all running images docker image To list all running and dormant images: docker image -a To list all running contianers docker ps To remove image docker rmi imageID To remove container docker rm containerID (remember to stop the container before removing it) To Execute a command or access container terminally docker exec -it contianerID /bin/bash

Create a docker container (DockerFile way)

You can pull image, configure the container and expose ports and volume all from one place using DockerFile.