关于docker：在Dockerfile中，如何更新PATH环境变量？

In a Dockerfile, How to update PATH environment variable?

我有一个从源代码下载和构建GTK的dockerfile，但以下行没有更新我的图像的环境变量：

1 2	RUN PATH="/opt/gtk/bin:$PATH" RUN export PATH

我读到我应该使用ENV来设置环境值，但以下指令似乎也不起作用：

ENV PATH /opt/gtk/bin:$PATH

这是我的整个Dockerfile：

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FROM ubuntu
RUN apt-get update
RUN apt-get install -y golang gcc make wget git libxml2-utils libwebkit2gtk-3.0-dev libcairo2 libcairo2-dev libcairo-gobject2 shared-mime-info libgdk-pixbuf2.0-* libglib2-* libatk1.0-* libpango1.0-* xserver-xorg xvfb

# Downloading GTKcd
RUN wget http://ftp.gnome.org/pub/gnome/sources/gtk+/3.12/gtk+-3.12.2.tar.xz
RUN tar xf gtk+-3.12.2.tar.xz
RUN cd gtk+-3.12.2

# Setting environment variables before running configure
RUN CPPFLAGS="-I/opt/gtk/include"
RUN LDFLAGS="-L/opt/gtk/lib"
RUN PKG_CONFIG_PATH="/opt/gtk/lib/pkgconfig"
RUN export CPPFLAGS LDFLAGS PKG_CONFIG_PATH
RUN ./configure --prefix=/opt/gtk
RUN make
RUN make install

# running ldconfig after make install so that the newly installed libraries are found.
RUN ldconfig

# Setting the LD_LIBRARY_PATH environment variable so the systems dynamic linker can find the newly installed libraries.
RUN LD_LIBRARY_PATH="/opt/gtk/lib"

# Updating PATH environment program so that utility binaries installed by the various libraries will be found.
RUN PATH="/opt/gtk/bin:$PATH"
RUN export LD_LIBRARY_PATH PATH

# Collecting garbage
RUN rm -rf gtk+-3.12.2.tar.xz

# creating go code root
RUN mkdir gocode
RUN mkdir gocode/src
RUN mkdir gocode/bin
RUN mkdir gocode/pkg

# Setting the GOROOT and GOPATH enviornment variables, any commands created are automatically added to PATH
RUN GOROOT=/usr/lib/go
RUN GOPATH=/root/gocode
RUN PATH=$GOPATH/bin:$PATH
RUN export GOROOT GOPATH PATH

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您可以在Dockerfile中使用环境替换，如下所示：

1	ENV PATH="/opt/gtk/bin:${PATH}"

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虽然Gunter发布的答案是正确的，但它与我已发布的内容没有什么不同。问题不是ENV指令，而是后续指令RUN export $PATH

一旦通过Dockerfile中的ENV声明环境变量，就无需导出环境变量。

删除RUN export ...行后，我的图像成功构建

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不建议这样做(如果你想创建/分发一个干净的Docker镜像)，因为PATH变量由/etc/profile脚本设置，所以可以覆盖该值。

head /etc/profile：

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if ["`id -u`" -eq 0 ]; then
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
else
PATH="/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games"
fi
export PATH

在Dockerfile的末尾，您可以添加：

1	RUN echo"export PATH=$PATH"> /etc/environment

因此为所有用户设置了PATH。

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