docker - Dockerfile wget失败

Question

我有以下代码

RUN apt-get update
RUN apt-get install -y wget     #install wget lib
RUN mkdir -p example && cd example     #create folder and cd to folder
RUN WGET -r https://host/file.tar && tar -xvf *.tar   # download tar file to example folder and untar it in same folder
RUN rm -r example/*.tar # remove the tar file
RUN MV example/foo example/bar # rename untar directory from foo to bar

但我得到以下错误:

/bin/sh: 1: WGET: not found
tar: example/*.tar: Cannot open: No such file or directory
tar: Error is not recoverable: exiting now

我是Docker的新手。

Answer 1

Dockerfile中的每个后续RUN命令将位于/目录的上下文中。因此，您的.tar文件不在example/目录中，它实际上在/目录中，因为您的“cd到文件夹”对后续的RUN命令没有任何意义。除了执行cd example之外，还可以在运行WORKDIR example之前执行wget，例如:

RUN apt-get update
RUN apt-get install -y wget     #install wget lib
RUN mkdir -p example     # create folder and cd to folder
WORKDIR example/         # change the working directory for subsequent commands
RUN wget -r https://host/file.tar && tar -xvf *.tar   # download tar file to example folder and untar it in same folder
RUN rm -r example/*.tar # remove the tar file
RUN mv example/foo example/bar # rename untar directory from foo to bar

或者，在 cd example && ... some command目录中要执行的任何命令之前添加 example。