npm install在Docker中不起作用 [英] npm install doesn't work in Docker

问题描述

这是我的Dockerfile：

This is my Dockerfile:

FROM node:7

RUN apt-get update && apt-get install -y --no-install-recommends \
    rubygems build-essential ruby-dev \
    && rm -rf /var/lib/apt/lists/*

RUN npm install -gq gulp bower

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY . /usr/src/app

RUN npm install

CMD ["gulp", "start:dev"]

构建映像时，npm install命令执行时输出很少，而且速度非常快。我实际上是通过docker-compose构建的，它确实安装了卷-我看不到在软管上创建的node_modules文件夹。当我在该映像上启动容器时，可以看到没有node_modules文件夹。然后我执行npm install，一切开始工作-安装所有软件包需要2-3分钟，并且确实创建了node_modules文件夹。

When I build the image, the npm install command executes with little output and really quickly. I actually build it through docker-compose which does have a volume mounted - and I cannot see the node_modules folder being created on my hose. When I launch a container on this image, I can see there is no node_modules folder. I then execute npm install and things start working - it takes 2-3 minutes to install all the packages and the node_modules folder is indeed created.

这是怎么回事？我究竟做错了什么？为什么npm install在构建时不起作用，但随后在运行时起作用？

What is happening here? What am I doing wrong? Why doesn't npm install work at build time, but then it works at run time?

推荐答案

npm install 应该已经基于您的 Dockerfile 工作了。如果您在未安装卷的情况下运行映像，则可以看到创建的文件（ DIRNAME ：其中的 docker-compose.yml 位于）：

The npm install should have worked based on your Dockerfile. You can see the created files if you run the image without a mounted volume (DIRNAME: where your docker-compose.yml is located):

docker run --rm -it DIRNAME_node ls -ahl / usr / src / app

使用 docker build ，所有数据都存储在映像中。因此，这是希望您不会在主机上看到任何文件。

With docker build, all data is stored in the image. So, it's intended that you don't see any files created on your host.

如果您装载卷（通常在Linux中，也在Docker容器中）， 覆盖目录。因此，您看不到在构建步骤中创建的 node_modules 。

If you mount a volume (generally in Linux, also in a Docker container), it overlays the directory. So you can't see the node_modules created in the build step.

我建议您基于以下条件进行测试Docker映像本身，不要挂载该卷。然后，您有一个不可变的Docker映像，它更易于部署。

I suggest you do your tests based on the Docker image itself and don't mount the volume. Then you have an immutable Docker image which is better for deployment.

这篇关于npm install在Docker中不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！