[Docker Practical learning] 01 The basic concepts of docker

The content of docker’s preliminary learning

1. Basic concepts of Docker
2. Install the Docker
3. Docker runs Hello World

The background of the docker

• link : Docker Core technology preview
• Before learning docker, I first learned about his historical background, which is of great help to my study.
• Understanding the history can more quickly understand the direction of the development of technology and the essence of the way to use
• This article introduces the technological development process of Docker, the core technologies in Docker and the related sub-projects, which is a good introduction.

Basic concepts of Docker

Container technology

• The core ideas : Build once, Run anywhere.
• Build,Ship and Run
• Docker basic LXC developed by the go language.
• Open source licenses :Apache2.0

Mirror container repository

• images
  • Similar to a virtual machine images,Read-only template-independent file system
  • Can create container
  • Build based on DockerFile
  • It can be downloaded from Docker Hub(Docker Hub is similar to GitHub)
• container
  • Similar to a virtual machine,can start stop delete …
  • Isolated from each other but not as effective as virtual machines
  • Control Groups and Namespace Implement isolation
    • CGroups: Access restrictions on CPU, memory, disk, and other resources
    • Namespaces :Provides isolation of system resources: processes, networks, file systems, and so on.
• repository
  • It’s very similar to Git and GitHub that we learned about before.
  • Registry can save images .Docker Hub It’s so like a Git Hub.
  • Docker supports push and poll like Git。

Install the docker

• Docker have two types Community Edition(CE) and Enterprise Edition(EE), i select CE install on Ubuntu18.04

1. Update software sudo apt-get update
2. apt-get some tools sudo apt-get -y install \ apt-transport-https \ ca-certificates \ curl \ software-properties-common
3. China’s special network adds a mirror image of aliyun curl -fsSL http://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add - sudo add-apt-repository "deb [arch=amd64] http://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"
4. install docker-engine sudo apt-cache madison docker-engine sudo apt-get remove docker docker-engine docker.io sudo apt-get install docker-ce
   • Check to see if the right version is available
   • remove the docker if out server already has a docker
   • Finally, the official installation of docker-ce
5. we can check the docker version docker version
6. China USES mirror access to speed up
   1. edit /etc/docker/daemon.json sudo vi /etc/docker/daemon.json

{
 "registry-mirrors": ["https://n6syp70m.mirror.aliyuncs.com"]
}

1. sudo service docker restart

Try helloword with docker

docker container run hello-world run that command the docker will run and print hello world in terminal

conclusion

The content of docker’s preliminary learning

1. Basic concepts of Docker
2. Install the Docker
3. Docker runs Hello World

• This is the first time for me to record my study notes in English.
• I’m trying really hard and I hope it’s a good start
• I learn docker on this platform www.shiyanlou.com It’s not an AD but it works really well in Chinese The experiment costs one RMB per hour.But play docker with me is free
• If you have any questions, please contact me.