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DockerLight-weightvirtualization-forclass1

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

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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


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