docker - 创建自己的image

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参考: https://docs.docker.com/get-started/part2/

git clone https://github.com/dockersamples/node-bulletin-board
cd node-bulletin-board/bulletin-board-app

下载后,会发现有个 Dockerfile

$ cat Dockerfile 
FROM node:current-slim

WORKDIR /usr/src/app
COPY package.json .
RUN npm install

EXPOSE 8080
CMD [ "npm", "start" ]

COPY . .

接下来,编译:  (记得要先保证 sudo npm install 这个命令是可以运行的, 否则会失败.   见这个文章:   http://siwei.me/blog/posts/nodejs-nvm-linux-sudo-npm-install

# docker run --publish 8000:8080 --detach --name bb bulletinboard:1.0

Sending build context to Docker daemon  1.851MB
Step 1/7 : FROM node:current-slim
 ---> 25b380aa6cdd
Step 2/7 : WORKDIR /usr/src/app
 ---> Using cache
 ---> 957b70dc5292
Step 3/7 : COPY package.json .
 ---> e43e74a88cea
Step 4/7 : RUN npm install
 ---> Running in 2eef6a10816a
npm WARN deprecated package.json@2.0.1: Use pkg.json instead.

added 166 packages, and audited 166 packages in 1m

2 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities
npm notice 
npm notice New minor version of npm available! 7.0.14 -> 7.1.2
npm notice Changelog: 
npm notice Run `npm install -g npm@7.1.2` to update!
npm notice 
Removing intermediate container 2eef6a10816a
 ---> bb72b8cce8e8
Step 5/7 : EXPOSE 8080
 ---> Running in b193438df59b
Removing intermediate container b193438df59b
 ---> e1b4186c1a44
Step 6/7 : CMD [ "npm", "start" ]
 ---> Running in 8ecb0c5ac493
Removing intermediate container 8ecb0c5ac493
 ---> 33fe4d654c93
Step 7/7 : COPY . .
 ---> e14b3c4f73f8
Successfully built e14b3c4f73f8
Successfully tagged bulletinboard:1.0

所以,接下来,我们开始创建:

1. 找一个基础版的操作系统,下载. 例如,我用的是ubuntu: 

docker pull ubuntu

Using default tag: latest
latest: Pulling from library/ubuntu
da7391352a9b: Pull complete 
14428a6d4bcd: Pull complete 
2c2d948710f2: Pull complete 
Digest: sha256:c95a8e48bf88e9849f3e0f723d9f49fa12c5a00cfc6e60d2bc99d87555295e4c
Status: Downloaded newer image for ubuntu:latest
docker.io/library/ubuntu:latest

2. 运行这个image:  

docker run -it ubuntu bash      (-i, -t 分别表示: -i:  interactive,  -t: tty , 所以这里不能省略,否则 docker ps 不会有内容)

3. 就可以直接进入到 ubuntu环境下了, apt-get , apt-update 就可以直接使用了.

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