Application packaging or test team?

Docker Is an open source application container engine , be based on Go Language development ,Docker Allows developers to package their applications and dependencies into a lightweight package 、 In a portable container , Then publish to any popular system .
Docker Is the world's leading software container platform ,Docker The official slogan is ” Debug your application , Instead of debugging the environment “. When conducting multi person collaborative development , Developers can use Docker To eliminate the so-called “ I run well here ”（works on my machine） problem , Operation and maintenance personnel use Docker To run and manage applications in parallel to obtain better computing density , Based on separate containers , The application will not run incorrectly due to environmental reasons .
As shown in the figure below ： At work , If we face so many services 、 Multiple servers , And a variety of environments , How should we deal with it ？ If you continue to package and deploy in the traditional way , How much time will we waste ？

So in Docker Before Hengkong was born , Most of the R & D teams have been in pain , stay Docker When it appears , It makes more efficient use of system resources 、 Faster startup time 、 Consistent operating environment 、 Continuous delivery and deployment 、 Easier migration 、 Easier maintenance and expansion ,6 The big advantage quickly caught fire .
Docker Three concepts of ：

• Mirror image （Image）： Is an object with file system Docker Read only template for the engine . Any application needs an environment to run , And the image is used to provide this kind of running environment . For example, one Ubuntu A mirror image is one that contains Ubuntu Templates for the operating system environment .
• Containers （Container）： It's like a lightweight sandbox , Think of it as a minimalist Linux System environment （ Include root jurisdiction 、 Process space 、 User space and cyberspace, etc ）, And the applications running in it .Docker The engine uses containers to run 、 Isolate applications . Container is an application instance created by image , You can create 、 start-up 、 stop it 、 Delete container , The containers are isolated from each other , They don't influence each other . Be careful ： The image itself is read-only , When the container starts from the mirror ,Docker Create a writable layer on top of the image , The image itself remains the same .
• Warehouse （Repository）： Mirror warehouse , yes Docker It is used to store image files in a centralized way .

Docker It's an open source commercial product , There are two versions ： Community Edition （Community Edition, Abbreviation for CE） And enterprise （Enterprise Edition, Abbreviation for EE）. The enterprise edition includes some charging services , Not usually used . We will demonstrate Docker CE How to use this version .
Docker Support many operating system platforms , There are commonly used Microsoft Windows Serial operating system （Docker I won't support it Windows 10 Home edition system ）,Linux Distribution and macOS System .

Windows There are two types of installation on the Docker The way ：

• The first one is ： visit Docker Web site to download Docker Desktop The software exe file , Download address ：
https://download.docker.com/win/stable/Docker%20Desktop%20Installer.exe
• The second kind ： Use Chocolatey Package management tool installation Docker.（ The package management tool needs to be downloaded and installed by yourself ）
choco install docker-for-windows

1. Switch to administrator rights

su root

2. Install some of the necessary system tools

apt-get update

apt-get -y install apt-transport-https ca-certificates curl

software-properties-common

3. install GPG certificate

curl -fsSL 
http://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg 
| sudo apt-key add -

4. Write the software source information

add-apt-repository "deb [arch=amd64] 
http://mirrors.aliyun.com/docker-ce/linux/ubuntu 
$(lsb_release -cs) stable"

5. Update and install Docker-CE

apt-get -y update

apt-get -y install docker-ce

1. Switch to administrator rights

su root

2. Install some of the necessary system tools

yum install -y yum-utils device-mapper-persistent-data lvm2

3. Add software source information

yum-config-manager --add-repo \
http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

4. Update and install Docker-CE

yum makecache fast

yum -y install docker-ce

• The first one is ： visit Docker Web site to download Docker Desktop Of dmg Installation package , Download address ：https://download.docker.com/mac/stable/Docker.dmg
• The second kind ： Use package management tools to install Docker, Use Homebrew Tool installation Docker.（ The package management tool needs to be downloaded and installed by yourself ）

brew cask install docker

1. start-up Docker

systemctl start docker

2. Restart Docker

systemctl restart docker

3. It starts automatically when the machine is turned on Docker

systemctl enable docker

4. see Docker Running state

systemctl status docker

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