Question

我第一次尝试使用docker进行开发。我有一个节点应用程序。我想从docker运行应用程序。这是我的dockerfile：

FROM node:6.0.0-slim
MAINTAINER pyprism

# Prepare app directory
RUN mkdir -p /src/

# Install dependencies
WORKDIR /src/

VOLUME .:/src/

RUN npm install

# Build the app
# RUN npm build

# Expose the app port
EXPOSE 8000

# Start the app
CMD npm start

和docker-compose文件：

web:
  build: .
  ports:
    - '8000:8000'

但是当我运行docker-compose up时，我遇到了这个错误：

Building web
Step 1 : FROM node:6.0.0-slim
 ---> 7bf50b1ad9da
Step 2 : MAINTAINER pyprism
 ---> Running in d1defd389fe6
 ---> b684686c614d
Removing intermediate container d1defd389fe6
Step 3 : RUN mkdir -p /src/
 ---> Running in 36b64560f88f
 ---> 8eb6847d67e4
Removing intermediate container 36b64560f88f
Step 4 : WORKDIR /src/
 ---> Running in 00d4c1fd2cf5
 ---> 88a54e6af176
Removing intermediate container 00d4c1fd2cf5
Step 5 : VOLUME .:/src/
 ---> Running in dc0e9d9d973a
 ---> b558f03ce63c
Removing intermediate container dc0e9d9d973a
Step 6 : RUN npm install
 ---> Running in 09445786b71e
npm info it worked if it ends with ok
npm info using npm@3.8.6
npm info using node@v6.0.0
npm info lifecycle undefined~preinstall: undefined
npm info linkStuff !invalid#1
npm info lifecycle undefined~install: undefined
npm info lifecycle undefined~postinstall: undefined
npm info lifecycle undefined~prepublish: undefined
npm WARN enoent ENOENT: no such file or directory, open '/src/package.json'
npm WARN src No description
npm WARN src No repository field.
npm WARN src No README data
npm WARN src No license field.
npm info ok 
 ---> 8c544294e6c5
Removing intermediate container 09445786b71e
Step 7 : EXPOSE 8000
 ---> Running in 965e192bc67e
 ---> daaf52fac6ca
Removing intermediate container 965e192bc67e
Step 8 : CMD npm start
 ---> Running in 890549e3aea7
 ---> 19a3dc786cee
Removing intermediate container 890549e3aea7
Successfully built 19a3dc786cee
WARNING: Image for service web was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
Creating redux_web_1
Attaching to redux_web_1
web_1  | npm info it worked if it ends with ok
web_1  | npm info using npm@3.8.6
web_1  | npm info using node@v6.0.0
web_1  | npm ERR! Linux 4.4.0-22-generic
web_1  | npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "start"
web_1  | npm ERR! node v6.0.0
web_1  | npm ERR! npm  v3.8.6
web_1  | npm ERR! path /src/package.json
web_1  | npm ERR! code ENOENT
web_1  | npm ERR! errno -2
web_1  | npm ERR! syscall open
web_1  | 
web_1  | npm ERR! enoent ENOENT: no such file or directory, open '/src/package.json'
web_1  | npm ERR! enoent ENOENT: no such file or directory, open '/src/package.json'
web_1  | npm ERR! enoent This is most likely not a problem with npm itself
web_1  | npm ERR! enoent and is related to npm not being able to find a file.
web_1  | npm ERR! enoent 
web_1  | 
web_1  | npm ERR! Please include the following file with any support request:
web_1  | npm ERR!     /src/npm-debug.log
redux_web_1 exited with code 254

Answer 1

这不是在dockerfile中使用指令VOLUME的正确方法。正如文档所说：“VOLUME指令创建一个具有指定名称的挂载点，并将其标记为从本机主机或其他容器中保存外部安装的卷”，我认为这不是您想要做的。

您无需指定VOLUME指令，也无需创建src directoy。修改Dockerfile如下：

FROM node:6.0.0-slim
MAINTAINER pyprism

# Install dependencies
WORKDIR /src/

RUN npm install

# Expose the app port
EXPOSE 8000

# Start the app
CMD npm start

现在您可以导航到Dockerfile目录并构建映像：

$docker build -t node .

然后使用-v选项运行容器以安装本地目录，如下所示：

 $docker run -p 8000:8000 -v path/to/code/dir:/src/ <image-name>

这会将您的代码目录挂载到/ src。

如果你想使用docker compose，只需在docker-compose.yml文件中指定卷：

 web:
  build: .
  volumes:
    - path/to/code/dir:/src/ 
  ports:
   - '8000:8000'

Answer 2

您无法在dockerfile中执行此操作VOLUME .:/src/。在dockerfile中指定主机挂载点不是合法的语法，因为它会使其依赖于主机。将卷映射定义移动到docker-compose.yml文件。

Answer 3

我正在添加此答案，以防万一接受的解决方案对其他人不起作用，对我不起作用。尽管我承认我既不是码头工人，也不是节点专家。

这就是我所拥有的： Dockerfile

FROM node

WORKDIR /usr/src/

RUN npm install

EXPOSE 4200

CMD npm start

docker-compose.yml

version: "3.2"
services:
  frontend:
    ports:
      - "4200:4200"
    volumes:
      - ./frontend/:/usr/src

要使其对我有用，我必须从Dockerfile中删除RUN npm install，并将cmd更改为CMD npm install && npm start

我认为问题是执行RUN时未挂载该卷，而仅在CMD之前挂载。另外请注意，在编辑Dockerfile之后，您将不得不重新构建映像。

这确实对我有用，但我又不是专家。因此，如果有人有任何想法或想法，请随时在评论中进行解释或进行修改以改善答案。

Docker：安装卷和运行节点应用程序

3 个答案: