Docker Setup and Commands

 # What is docker? 
   Docker is a is a containarization system in which we run an app in a container which is created by docker images.
 
 # How to install docker?
   
   - sudo apt-get install docker.io
   - sudo systemctl start docker
   - sudo systemctl enable docker
   - docker --version
   
 # Adding Docker to the User Group
   - sudo groupadd docker
   - sudo usermod -aG docker $USER
   - Restart System
 
 # Pulling Images from Docker Hub? 
  
   - docker pull ubuntu
   - docker pull wordpress
   .
   .
   .
   - docker pull mysql
   - docker images (Shows all the images)
   - docker info   (Shows all the info)
    
 # What is docker-compose?    
   Docker compose is a tool used to compose all the individual containers at once. 

 # How to install Docker Compose?
 
   - sudo apt-get install docker-compose

 # How to create Project using docker-composer?
 
  - Create a docker-compose.yml file in a directory
  - Put the docker images code in to pull that image from docker hub
  - sudo docker-compose up -d
  - sudo docker-compose down
  - sudo docker-compose down --volumes
  
 # Removing Docker Images, Volumes & Containers?
  
   - docker images                    (Shows all the images)
   - docker rmi image-id              (Removes a single image)
   - docker rmi $(docker images -q)   (Removes all the images)
   
   - docker ps -a                     (Shows all the containers)
   - docker rm container-id           (Removes a container)
   - docker rm $(docker ps -a -f status=exited -q)  (Removes all the exited container)
   
   - docker volume ls                  (Shows the list of volumes)
   - docker volume rm volume_name      (Removes the selected volume)
   - docker rm -v container_name       (Removes container and it's volumes)

 # SSH Into Docker Container

   - dokcer exec -it [container_id] bash
   - docker ps                         (Get the id of container) 

  - https://gist.github.com/anonymous/a13cf604981726c8e8b0bb05a35664e2