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docker - 在 Dockerfile 的 CMD 中使用 ENV var

问题描述

我正在尝试构建一个图像，我可以使用它来部署具有角度应用程序的多个容器。目的是让容器运行命令并使用以下命令自ng server --host ${HOST} --port ${PORT} --disable-host-check定义 ENV var ：docker rundocker-composes

默认环境变量（在 Dockerfile 中）

docker run -d --name bar -p 10000:4200 -v /path/to/AngularApp:/www me/ngx-admin:dev
会跑ng server --host 0.0.0.0 --port 4200 --disable-host-check

风俗 ：

docker run -d --name foo -e HOST='dev.my-domain.fr' -e PORT='4201' -p 10000:4201 -v /path/to/AngularApp:/www me/ngx-admin:dev
会跑ng server --host dev.my-domain.fr --port 4201 --disable-host-check

如果我理解正确ENTRYPOINT，CMD如果我将两者都用作“执行表单”（JSON 数组），CMD则后面会连接ENTRYPOINT为参数。

谢谢！

这是我的 Dockerfile（使用我尝试过的 CMD）和我遇到的不同错误：

# base image
FROM node:12

# install chrome for protractor tests
RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
RUN sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'
RUN apt-get update && apt-get install -yq google-chrome-stable


# set working directory
WORKDIR /www

# add `/www/node_modules/.bin` to $PATH
ENV PATH /www/node_modules/.bin:$PATH

# install and cache app dependencies
COPY package.json /www/package.json
RUN npm install -g @angular/cli@7.3.9
RUN npm install

# add app
COPY . /www

# default env
ENV HOST 0.0.0.0
ENV PORT 4200

EXPOSE ${PORT}

# start www
ENTRYPOINT ["ng", "serve"]
CMD ["--host",  "0.0.0.0", "--port", "4200", "--disable-host-check"]      # WORKS!!
#CMD ["--host",  "${HOST}", "--port", "${PORT}", "--disable-host-check"]    # cf. ERR 1
#CMD ["--host",  "${HOST}", "--port", ${PORT}, "--disable-host-check"]    # cf. ERR 2
#CMD ["--host",  "${HOST}", "--port", "4200", "--disable-host-check"]      # cf. ERR 3

错误 1

Cannot parse arguments. See below for the reasons.
    Argument port could not be parsed using value "".Valid type(s) is: number

码头工人检查

"Path": "ng",<br>
"Args": [
    "serve",<br>
    "--host",<br>
    "${HOST}",<br>
    "--port",<br>
    "${PORT}",<br>
    "--disable-host-check"
],

错误 2

Error: Project '/bin/sh' does not support the 'serve' target.
  at ServeCommand.initialize (/www/node_modules/@angular/cli/models/architect-command.js:58:19)<br>
  at async ServeCommand.validateAndRun (/www/node_modules/@angular/cli/models/command.js:127:9)<br>
  at async Object.runCommand (/www/node_modules/@angular/cli/models/command-runner.js:178:24)<br>
  at async default_1 (/www/node_modules/@angular/cli/lib/cli/index.js:32:31)

码头工人检查

"Path": "ng",<br>
"Args": [
    "serve",<br>
    "/bin/sh",<br>
    "-c",<br>
    "[\"--host\",  \"${HOST}\", \"--port\", ${PORT}, \"--disable-host-check\"]\t\t# ERR 2"
],

错误 3

rowserslist: caniuse-lite is outdated. Please run next command `npm update`
    getaddrinfo EAI_AGAIN ${HOST}<br>
    Error: getaddrinfo EAI_AGAIN ${HOST}
        at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:60:26)

码头工人检查

"Path": "ng",<br>
"Args": [<br>
    "serve",<br>
    "--host",<br>
    "${HOST}",<br>
    "--port",<br>
    "4200",<br>
    "--disable-host-check"
],

标签： dockerenvironment-variablesdockerfile

解决方案

当你使用执行列表时，Docker 会按字面意思解释给定的命令（没有变量扩展）。

如果你想扩展变量，你需要在你的CMD. 您可以替换您的ENTRYPOINTandCMD以仅使用它：

CMD ["sh", "-c", "ng serve --host ${HOST} --port ${PORT} --disable-host-check"]

进一步阅读：Dockerfile CMD 不理解 ENV 变量 [#5509]

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