docker package your application and all its dependencyies((including os)) together in a form of container so as to ensure that your application work seamlessly in any envirorment;

architecture

client-service;

client;
service:daemon

client->daemon: pull image from registry, run image

container, images

image: 运行程序所需要的源文件， os 环境

container: 运行在一个独立os环境的进程

a instance of a image

image example:

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FROM golang:1.16-alpine

WORKDIR /app

COPY go.mod ./
COPY go.sum ./
RUN go mod download

COPY *.go ./

RUN go build -o /docker-gs-ping

EXPOSE 8080

CMD [ "/docker-gs-ping" ]

docker compose

what:

将docker run 的参数写入配置文件
同时执行多个

docker volume

what: 数据持久化

types:

docker volume: 命名 and 匿名；
1. docker 创建和管理， docker 有完全的权限
2. 可以通过 docker 命令管理
3. 适合非配置的数据
bind mount：
1. 一般是用户创建的文件， docker 不一定有完全的权限
2. 不可以通过docker命令管理
3. 适合配置类型的数据
what? persiste data;

how

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docker run -d \
--name=nginxtest \
-v nginx-vol:/usr/share/nginx/html \
nginx:latest

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## docker command

image name syntax:
> [reigistry host name ]imageName:[tag]
for: aliyun.jenkins/centos:verson1.0;

1. build  image
  docker build  -t name:[tag] .
2. run contianer
  docker run  
  1. -d: run container in background
  2. --rm:Automatically remove the container when it exits
  3. -p: publish a container's port to the host
3. docker tag  sourceimage[tag] targetimage[tag]
  create a new image for souce image;
4. docker rmi
 remove images

## dockerfile instrution

1. COPY: COPY SRC DEST
 copy files from src and add them to the filesystem of the container  at dest
2. WORKDIR
  set the working directory fro any RUN,CMD,COPY and ADD instruction


## docker-compose








## docker  Registry

what: 一个存储 docker 镜像的地方； 

docker pull  registry_url:imagename
docker pull registr_urrl: imagename

如果registry_url是空，则默认从官方https://hub.docker.com/




docker image name:

[registry-hostname[:port]/]namespace/repository[:tag]

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docker will push to corresponding repositry based on the name