🧀 dockerfile 配置问题

FROM

FROM nginx:alpine
FROM express:23-alpine

如果这样写FROM语句，会有问题，因为这里涉及到一个多级构建的概念

首先FROM的概念，

The FROM instruction initializes a new build stage and sets the base image for subsequent instructions

多个FROM，最后仅会使用最终阶段构建的文件，如果希望这个镜像最终既有nginx,也有express环境的话，那么这么写FROM就会出错

CMD

CMD ["nginx", "-g", "daemon off;"]
CMD ["node", "/server/index.js"]

这样也有问题，

There can only be one CMD instruction in a Dockerfile. If you list more than one CMD, only the last one takes effect.