docker - 输入新的Docker镜像时返回空PATH

Question

我已经写了一个Dockerfile来构建一个docker镜像:

#author russell jarvis rjjarvis@asu.edu

#start from the serial version of ubuntu NEURON+Python as if its a module
# add mpi support


#NEURON Dockerfile
#Docker comments must be of this form.
# This is the syntax for a directive. Don’t get confused
#Set the base image to pyneuron-toolbox


FROM russelljarvis/pyneuron-toolbox
RUN echo $PATH


WORKDIR $HOME
RUN sudo /opt/conda/bin/conda install -y mpi4py ipython
RUN echo $PATH


WORKDIR /home/docker

RUN \
   sudo wget https://www.open-mpi.org/software/ompi/v2.0/downloads/openmpi-2.0.0.tar.gz && \
   sudo tar -xzf openmpi-2.0.0.tar.gz && \
   sudo rm openmpi-2.0.0.tar.gz
RUN echo $PATH

WORKDIR /home/docker/openmpi-2.0.0


RUN \
  sudo ./configure && \
  sudo make all && \
  sudo make install

RUN echo $PATH

#Download  maven, and its java dependencies

WORKDIR $HOME/git
RUN sudo apt-get -y install default-jre default-jdk maven

RUN echo $PATH


WORKDIR /home/docker/neuron/nrn-7.4



RUN sudo ./configure --prefix=`pwd` --without-iv --with-nrnpython=/opt/conda/bin/python --with-paranrn=/usr/bin/mpiexec
RUN sudo make all && \
   sudo make install

RUN echo $PATH

WORKDIR src/nrnpython
RUN sudo /opt/conda/bin/python3.4 setup.py install

RUN echo $PATH
RUN echo "its chowning the USER directory that seems to break path" 
#RUN sudo chown -R docker $HOME
RUN echo $PATH
WORKDIR /home/docker/git
#RUN git clone https://github.com/NeuroML/jNeuroML
RUN git clone https://github.com/russelljjarvis/jNeuroML.git
WORKDIR jNeuroML
RUN sudo /opt/conda/bin/python getNeuroML.py
ENV ADDITIONAL_PATH="/neuron/nrn-7.4/x86_64/bin"
CMD export PATH=$PATH:$ADDITIONAL_PATH; /bin/echo -e "ADDITIONAL_PATH is $ADDITIONAL_PATH\nPATH is $PATH"
RUN echo $PATH
RUN echo $ADDITIONAL_PATH

#WORKDIR /home/docker/git
#RUN git clone

我用Dockerfile指定了镜像

$docker build .

我找到最新版本的IMAGE ID，并使用以下命令输入:

$docker run -it d10bd1b2c2bb /bin/bash

但是，当我输入docker镜像时，我发现环境变量PATH的内容为空。

最后的命令是:

ENV ADDITIONAL_PATH="/neuron/nrn-7.4/x86_64/bin"  
CMD export PATH=$PATH:$ADDITIONAL_PATH; /bin/echo -e "ADDITIONAL_PATH is $ADDITIONAL_PATH\nPATH is $PATH"
RUN echo $PATH  
RUN echo $ADDITIONAL_PATH

RUN echo语句的输出是适当的。在构建镜像的过程中，docker环境变量看起来不错，但是，仅当我输入docker镜像时，才会出现问题。

如果省略了这些最终的Docker命令，那么当我进入新创建的镜像时，PATH变量仍然是一个空字符串。

我想知道是否有人知道出了什么问题？

感谢您的任何建议。

Answer 1

仅以下形式的语句:
ENV路径/ opt / conda / bin / conda:/ opt / conda / bin / python:$ PATH
应该用于设置环境变量。
然后可以使用以下命令检查path变量:
运行echo $ PATH
在构建期间，但是命令如
conda和python可能无法在构建过程中按预期运行，但是当您输入docker镜像时，PATH变量将正确更新。