Docker初體驗

Docker簡介

Docker 項目的目标是實作輕量級的作業系統虛拟化解決方案。Docker 的基礎是 Linux 容器（LXC）等技術。其主要目的是保證一緻的運作環境，以及更快速的傳遞與部署。

Docker鏡像與容器

鏡像：鏡像（Image）就是一堆隻讀層（read-only layer）的統一視角。

容器：容器（container）的定義和鏡像（image）幾乎一模一樣，也是一堆層的統一視角，唯一差別在于容器的最上面那一層是可讀可寫的。容器 = 鏡像 + 可讀層。

鏡像有關指令

搜尋鏡像：docker search 在docker index中搜尋image

下載下傳鏡像：docker pull 從docker registry server 中下拉image

上傳鏡像：docker push NAME[:TAG]

鏡像有關的其它，指令均可以通過 docker image --help 檢視

Commands:
  build       Build an image from a Dockerfile
  history     Show the history of an image
  import      Import the contents from a tarball to create a filesystem image
  inspect     Display detailed information on one or more images
  load        Load an image from a tar archive or STDIN
  ls          List images
  prune       Remove unused images
  pull        Pull an image or a repository from a registry
  push        Push an image or a repository to a registry
  rm          Remove one or more images
  save        Save one or more images to a tar archive (streamed to STDOUT by default)
  tag         Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE
      

容器有關指令

鏡像有關的其它，指令均可以通過 docker container --help 檢視

Commands:
  attach      Attach local standard input, output, and error streams to a running container
  commit      Create a new image from a container's changes
  cp          Copy files/folders between a container and the local filesystem
  create      Create a new container
  diff        Inspect changes to files or directories on a container's filesystem
  exec        Run a command in a running container
  export      Export a container's filesystem as a tar archive
  inspect     Display detailed information on one or more containers
  kill        Kill one or more running containers
  logs        Fetch the logs of a container
  ls          List containers
  pause       Pause all processes within one or more containers
  port        List port mappings or a specific mapping for the container
  prune       Remove all stopped containers
  rename      Rename a container
  restart     Restart one or more containers
  rm          Remove one or more containers
  run         Run a command in a new container
  start       Start one or more stopped containers
  stats       Display a live stream of container(s) resource usage statistics
  stop        Stop one or more running containers
  top         Display the running processes of a container
  unpause     Unpause all processes within one or more containers
  update      Update configuration of one or more containers
  wait        Block until one or more containers stop, then print their exit codes
      

常用指令

使用鏡像建立容器 docker container run -d -p localport:containerport

重新進入容器指令 docker container exec -it /bin/bash

Dockerfile 建立自定義鏡像

FROM ubuntu:20.04
LABEL description='Flask project for flask'

RUN  apt-get update
#RUN  apt-get upgrade -y

# Install vim
RUN apt-get install -y vim

# Install pip
RUN apt-get install -y python3-pip
RUN pip3 install flask==1.1.2 -i https://pypi.douban.com/simple/ && pip3 install gunicorn==20.1.0 -i https://pypi.douban.com/simple/

COPY /flask /flask
WORKDIR /flask

# 暴露的容器端口
EXPOSE 7080 7081  
# 必須用中括号寫，直接寫啟動語句在執行後會自動關閉容器
#CMD ["python3", "./flasktext.py"]
CMD gunicorn -c gunicorn.conf.py flasktext:app
      

覺得有幫助的話點個贊吧~

作者：糖烤栗子＆