Docker[1] is a tool designed to make it easier to create, deploy, and run applications by using containers.

In this class , i will introduce the Virtual Maching used in Docker Class.

• How to install the docker ?
  c.f Search "docker ce install centos7 "on google.com
  centos 7 install docker
  **You can use this command to verify that your virtual machine has docker installed

  rpm -qa | grep docker

In this docker VM needed two network adapter, (1) NAT (2) Host-only

• How to start the docker service ?

  systemctl start docker

• How to check the docker service?

  systemctl status docker

  **For this First Class**

  we need to pull the docker image from docker hub after started the docker service in this VM, and change the user to root

  docker pull chusiang/takaojs1607

this command could need some time to get the docker images from the internet .
After when you fininshed , you can use this command to check the docker images in your VM

docker images

in this command , you can see the Repository (Let's use this example)
(1)chusiang means the docker account
(2)takaojs1607 means the image name

And you can see that the IMAGED ID like 90ebc6376878

• IMAGED ID can be only , and the containers ID can be many different.*

Let start docker !

docker run -it chusiang/takojs1607 bash
-i means interactive
-t means terminal
bash ---> command

the basic command for first Class

1. docker ps
   it can check what the docker process run on this system
   ex: the container id is f0eba9cc4a7
2. `docker stop containers ID
   ex: docker stop f0e
3. docker ps -a
   -a meanes all , you can see all the docker process
4. docker start containers ID
   ex: docker start f0e
5. docker attach containers ID
   ex: docker attach f0e
6. docker rm containers ID
   you can use this command to remove this container !
   But !! not the docker images !
7. docker rm -f $(docker ps -q -a)

   this command can kill the docker container by force whatever the docker process start or stop
   -f means force
   -a means all

Reference
[1]https://www.docker.com