Docker在构建时丢失了纱线依赖

问题描述

在Dockerfile中运行yarn安装时无法获取node_modules文件夹

 稍作修改：
 从红宝石：2.5 
 
 RUN curl -sL https://deb.nodesource.com /setup_8.x | bash-&& \ 
 curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt键添加-&& \ 
 echo deb https://dl.yarnpkg.com/debian/ stable main | tee /etc/apt/sources.list.d/yarn.list&& \ 
易于获取更新&& \ 
 apt-get install -qq -y build-essential libpq-dev nodejs yarn 
 
 RUN mkdir / build&& mkdir / myapp 
 WORKDIR / build 
 
添加./package.json / build / 
 
 RUN yarn install 
 
 WORKDIR / myapp 
 
 CMD cp -a / build / node_modules / / myapp / 
  
纱线包将在图像中的 / build 文件夹中构建，并在容器启动后复制到 / myapp 文件夹中。 / p> 
 
 
  2。。您使用原始的 docker-compose.yaml 文件：
 版本： 3 
服务：
网站：
构建：。 
量：
-。：/ myapp 
  
开始时 web 容器：
  docker-compose up web 
  
文件夹 node_modules 被复制到已装载的文件夹，即。 主机上的文件夹。
 
 
 
  3。。现在您可以启动任何容器，它将包含<$  / myapp 中的c $ c> node_modules 文件夹：
  docker-compose run web bash 
  
因此，您将能够实现目标
  $ docker-compose build&& docker-compose up web 
 $ docker-compose run web bash 
 root @ 4b38e60adfa3：/ myapp＃ls -la 
总计64 
 drwxrwxr-x 3 1000 1000 4096 2月24 10 ：59。 
 drwxr-xr-x 66根root 4096 Feb 24 11:13 .. 
 -rw-rw-r-- 1 1000 1000 497 Feb 24 10:55 Dockerfile 
 -rw-rw -r-- 1 1000 1000 73 2月24日09:02 docker-compose.yaml 
 drwxr-xr-x 818根root 40960 2月24日10:57 node_modules 
 -rw-rw-r-- 1根根333 Feb 23 22:07 package.json 
  
 
Can't get node_modules folder when running yarn install in the Dockerfile
test-sof
├── docker-compose.yml
├── Dockerfile
├── package.json
└── yarn.lock
docker-compose.yml
version: '3'
services:
  web:
    build: .
    volumes:
      - .:/myapp
package.json
{
  "name": "site",
  "private": true,
  "dependencies": {
    "@rails/webpacker": "^3.2.1",
    "babel-preset-react": "^6.24.1",
    "prop-types": "^15.6.0",
    "react": "^16.2.0",
    "react-dom": "^16.2.0",
    "reactjs": "^1.0.0",
    "underscore": "^1.8.3"
  },
  "devDependencies": {
    "webpack-dev-server": "^2.11.1"
  }
}
Dockferfile
FROM ruby:2.5

RUN curl -sL https://deb.nodesource.com/setup_8.x | bash - && \
    curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
    echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && \
    apt-get update && \
    apt-get install -qq -y build-essential libpq-dev nodejs yarn

RUN mkdir /myapp
WORKDIR /myapp

ADD ./package.json /myapp/

RUN yarn install
output of the step RUN yarn install when docker-compose build:
Running command: docker-compose run web bash to get in the container
root@11af1818e494:/myapp# ls    
Dockerfile  docker-compose.yml  package.json
no node_modules folder present, but later when running inside the container: yarn install output:
then when listing: 
root@11af1818e494:/myapp# ls    
Dockerfile  docker-compose.yml  node_modules  package.json  yarn.lock
folder node_modules IT IS present. Why?
 解决方案 
This part of Dockerfile installs yarn packages:
RUN mkdir /myapp
WORKDIR /myapp
ADD ./package.json /myapp/
RUN yarn install
Folder /myapp is created, package.json is copied to it and yarn packages are installed. Build is successful and, of course, node_modules folder is inside built image.
But after that you start built image with:
volumes:
  - .:/myapp
which means that content of folder where docker-compose.yaml is is mounted to /myapp folder inside container, so it covers content of container's /myapp folder.
You don't need to mount current folder to container's folder to achieve what you want. Just delete it from your docker-compose.yaml:
version: '3'
services:
  web:
    build: .
Now you can:
$ docker-compose build
$ docker-compose run web bash
root@558d5b0c2ccb:/myapp# ls -la
total 268
drwxr-xr-x   3 root root   4096 Feb 23 22:25 .
drwxr-xr-x  65 root root   4096 Feb 23 22:36 ..
drwxr-xr-x 818 root root  36864 Feb 23 22:25 node_modules
-rw-rw-r--   1 root root    333 Feb 23 22:07 package.json
-rw-r--r--   1 root root 219075 Feb 23 22:25 yarn.lock
EDIT:
If you want to achieve the above goal, you can use the following workaround:
1. You modify Dockerfile a little:
FROM ruby:2.5

RUN curl -sL https://deb.nodesource.com/setup_8.x | bash - && \
    curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
    echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && \
    apt-get update && \
    apt-get install -qq -y build-essential libpq-dev nodejs yarn

RUN mkdir /build && mkdir /myapp
WORKDIR /build

ADD ./package.json /build/

RUN yarn install

WORKDIR /myapp

CMD cp -a /build/node_modules/ /myapp/
That's means that yarn packages will be built in /build folder inside image and copied to /myapp folder once container is started.
2. You use the original docker-compose.yaml file:
version: '3'
services:
  web:
    build: .
    volumes:
      - .:/myapp
when you start web container:
docker-compose up web
folder node_modules is copied to mounted folder i.e. to . folder on your host machine.
3. Now you can start any container and it will be contain node_modules folder inside /myapp:
docker-compose run web bash
So, you will be able to achieve your goal the following way:
$ docker-compose build && docker-compose up web
$ docker-compose run web bash
root@4b38e60adfa3:/myapp# ls -la
total 64
drwxrwxr-x   3 1000 1000  4096 Feb 24 10:59 .
drwxr-xr-x  66 root root  4096 Feb 24 11:13 ..
-rw-rw-r--   1 1000 1000   497 Feb 24 10:55 Dockerfile
-rw-rw-r--   1 1000 1000    73 Feb 24 09:02 docker-compose.yaml
drwxr-xr-x 818 root root 40960 Feb 24 10:57 node_modules
-rw-rw-r--   1 root root   333 Feb 23 22:07 package.json
                        
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