docker run-e process of passing environment variables

docker run -e pass environment variables

1. Dockerfile

FROM openjdk:8-jdk-alpine
MAINTAINER fengqiangboy shenzhen &lt;fengqiangboy@&gt;
RUN mkdir -p /usr/local/proxy-server
COPY  /usr/local/proxy-server
RUN cd /usr/local/proxy-server &amp;&amp; \
chmod +x 
WORKDIR /usr/local/proxy-server
# Set the environment variable USERNAME The default value is admin, which can be modified later by docker run -e USERNAME="XXXXXX". This environment variable can also be obtained in the container.ENV USERNAME admin
RUN echo 'USERNAME=' $USERNAME  # Print the default value# Run the script, $USERNAME passes parameters into the script, and cannot use CMD [], variables cannot be read in this wayCMD sh  $USERNAME

2.

#!/bin/bash
MODULE=$1  # Define the variable to the first parameter of $USERNAME passed aboveecho 'MODULE=' ${MODULE} # Print

If you want to replace the parameters, use the commandsed -i "s/<USERNAME>/$USERNAME/" , double quotes must be used, variables cannot be read in single quotes

View the final file directory

[root@wanfei test-docker]# ls
Dockerfile

3. Make a mirror

[root@wanfei test-docker]# docker build -t www/test-docker .

4. Run the mirror

[root@wanfei test-docker]# docker run --name docker -e USERNAME="WANFEI" www/test-docker
MODULE= WANFEI

Print successfullyWANFEI

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