少啰嗦，先看代码
package.json
{"name": "xxx","version": "0.0.0","private": true,"scripts": {"start": "node ./bin/www","forever": "node_modules/forever/bin/forever bin/www"},"dependencies": {"async": "0.9.0","body-parser": "1.13.2","compression": "1.6.2","config": "1.12.0","connect-multiparty": "2.0.0","cookie-parser": "1.3.5","debug": "2.2.0","ejs": "2.3.3","express": "4.13.1","forever": "0.15.3","http-proxy-middleware": "0.17.3","log4js": "0.6.24","serve-favicon": "2.3.0"}
}dockerfile
FROM hub.c.163.com/lightingfire/nodejs:6.9.1-alpine
WORKDIR /app
COPY package.json /app
RUN npm i --registry https://registry.npm.taobao.org && npm cache clean
COPY . /app
EXPOSE 8086
CMD npm run forever分析原理
- 使用alpine的nodejs镜像，显著缩小nodejs镜像大小
- 使用npm cache clean命令，清空npm缓存，再次减少npm包占用的时间
- npm i 和 npm chache clean放在一起写，减少build的层数
- 使用淘宝npm源，显著提高npm包下载的速度
- 守护进程forever通过npm运行node_module中的包，避免单独全局安装forever的占用时间
- copy package到run npm i到copy . /app, 这样的顺序可以充分使用镜像缓存
修改过后，对比之前通过jenkins打包时间从10分钟缩短到7.4秒
参考资料
- How to write excellent Dockerfiles
