node.js - 如何将我的本地源文件挂载到 docker 容器？

Question

我是 docker 的新手，我已经创建了我的自定义镜像。

这是我的 Dockerfile

FROM node:latest

MAINTAINER FF

COPY . /var/www

WORKDIR /var/www

RUN npm install  

EXPOSE 3000

ENTRYPOINT ["npm", "start"]

然后我构建一个图像

docker build -t test/node .

镜像构建完成后，我运行

docker run -p 8888:3000 -v $(pwd):/var/www -w "/var/www" test/node

我使用 -v 是因为我想将主机 src 文件夹挂载到 /var/www。

它回来了

> expresssite@0.0.0 start /var/www
> node ./bin/www

module.js:472
    throw err;
    ^

Error: Cannot find module 'express'
    at Function.Module._resolveFilename (module.js:470:15)
    at Function.Module._load (module.js:418:25)
    at Module.require (module.js:498:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/var/www/app.js:1:77)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)

npm info lifecycle expresssite@0.0.0~start: Failed to exec start script
npm ERR! Linux 4.4.39-moby
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "start"
npm ERR! node v7.4.0
npm ERR! npm  v4.0.5
npm ERR! code ELIFECYCLE
npm ERR! expresssite@0.0.0 start: `node ./bin/www`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the expresssite@0.0.0 start script 'node ./bin/www'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the expresssite package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node ./bin/www
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs expresssite
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls expresssite
npm ERR! There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?

npm ERR! Please include the following file with any support request:
npm ERR!     /var/www/npm-debug.log

我认为问题是我的 src 文件夹没有 express 模块，但我已经在我的图像中安装了 npm，我认为这就是我所需要的。

我做错了什么？谁能帮我解决这个问题？非常感谢!

Answer 1

问题是COPY和volume的结合

发生了什么

1. 您在创建镜像时将源代码复制到 Docker 镜像
2. npm install 在图像内部运行(因此不会影响您的源代码)
3. 但是，当您装载该卷时，它会覆盖/var/www 有效地使步骤 1. 和 2. 无用

您要做的是在启动 docker 之前或在其中运行 npm install。