在docker文件基本中使用环境变量

Question

使用以下泊坞窗文件，我在RUN md $ SiteFolderPath上遇到错误，并且我不确定为什么我看的每个示例：

https://docs.docker.com/engine/reference/builder/#environment-replacement

表示我做得正确。

FROM microsoft/iis
#FROM nanoserver/iis

SHELL ["powershell"]

ENV SiteFolderPath c:\\app
ENV SiteFolderPathLogs c:\\app\\logs
ENV WorkFolder /app

ENV SiteAppPool LocalAppPool
ENV SiteName LocalWebSite
ENV SiteHostName LocalSite

RUN md $SiteFolderPath
RUN md $SiteFolderPathLogs
WORKDIR $WorkFolder


COPY ./Public .

RUN New-Item $SiteFolderPath -type Directory
RUN Set-Content $SiteFolderPath\Default.htm "<h1>Hello IIS</h1>"
RUN New-Item IIS:\AppPools\$SiteAppPool
RUN New-Item IIS:\Sites\$SiteName -physicalPath $SiteFolderPath -bindings @{protocol="http";bindingInformation=":80:"+$SiteHostName}
RUN Set-ItemProperty IIS:\Sites\$SiteName -name applicationPool -value $SiteAppPool

EXPOSE 80
EXPOSE 443

VOLUME ${SiteFolderPathLogs}

构建docker文件时出现错误消息：

mkdir：无法将参数绑定到参数'Path'，因为它为null。

Answer 1

您链接到的页面指出：

Environment variables are supported by the following list of instructions in the Dockerfile:

ADD
COPY
ENV
EXPOSE
FROM
LABEL
STOPSIGNAL
USER
VOLUME
WORKDIR

as well as:

ONBUILD (when combined with one of the supported instructions above)

由于将变量用作RUN块的一部分，因此应使用Windows环境变量语法：％SiteFolderPath％