Docker容器启动命令没有获取.bashrc变量

Question

I'm using docker to execute a command when starting the container but seems the environment variable did not get from the .bashrc file, please give me some advice. thanks

dockerFile I add this to .bashrc: echo "export PYTHONPATH=$PYTHONPATH:/models/research:/models/research/slim" >> /root/.bashrc

docker-compose.yml file with:

command: ["python2", "/usr/bin/supervisord", "--nodaemon", "--configuration", "/etc/supervisor/supervisord.conf"]

PS:if I exec echo $PYTHPATH or just exec python2 /usr/bin/supervisord -c /etc/supervisor/supervisor.conf from container, there have not issues.

The System is Ubuntu 16.04

supervisor config:

[program:mosquitto-subscrible]
process_name=%(program_name)s_%(process_num)02d
command=python3 detection.py start_mosquitto_subscrible 
autostart=true
autorestart=true
user=root
numprocs=1
directory=/var/www/html/detection
redirect_stderr=true
stdout_logfile=/var/www/html/detection/logs/detection.log

docker-compose.yml

version: '3'
services:
  tensorflow:
    container_name: object-detection
    build:
    context: ./tensorflow
    dockerfile: Dockerfile
    # environment:
    #   - PYTHONPATH=:/models/research:/models/research/slim
    volumes:
      - ./www:/var/www/html:cached
      - ./tensorflow/supervisor:/etc/supervisor/conf.d
    command: ['tail', '-f', '/dev/null']
    # command: ["python2", "-c", "/usr/bin/supervisord", "--nodaemon","--configuration", "/etc/supervisor/supervisord.conf"]

In conclusion, I write a command in Dockfile echo "export PYTHONPATH=$PYTHONPATH:/models/research:/models/research/slim" >> /root/.bashrc to make /models/research can be found by PYTHON.

there have a python model /models/research/object_detection .

with my supervisor, the command python3 detection.py start_mosquitto_subscrible can't find object_detection model if I start supervisord just from docker-compose command instead of exec it inside docker container.

supervisord need python2 to start, my code needs python3

Answer 1

command: ["python2", "/usr/bin/supervisord", "--nodaemon", "--configuration", "/etc/supervisor/supervisord.conf"]

The command you've provided is using the exec syntax. See the documentation on CMD (the same applies to RUN and ENTRYPOINT ):

If you use the shell form of the CMD , then the <command> will execute in /bin/sh -c :

 FROM ubuntu CMD echo "This is a test." | wc - 

If you want to run your <command> without a shell then you must express the command as a JSON array and give the full path to the executable. This array form is the preferred format of CMD . Any additional parameters must be individually expressed as strings in the array:

 FROM ubuntu CMD ["/usr/bin/wc","--help"] 

In your case, you want a bash shell to process the .bashrc file, which means you need something along the lines of:

command: ["/bin/bash", "-c", "python2 /usr/bin/supervisord --nodaemon --configuration /etc/supervisor/supervisord.conf"]

---

Edit: with the /root/.bashrc in ubuntu:16.04, you'll see the following at the top of the file:

# If not running interactively, don't do anything
[ -z "$PS1" ] && return

You can modify the file before this line with this sed command:

sed -i '4s;^;export PYTHONPATH=$PYTHONPATH:/models/research:/models/research/slim\n;' /root/.bashrc

---

I'd consider placing this in a script used to start the container instead of hacking the .bashrc, eg a start.sh:

#!/bin/sh
export PYTHONPATH=$PYTHONPATH:/models/research:/models/research/slim
exec python2 /usr/bin/supervisord --nodaemon --configuration /etc/supervisor/supervisord.conf

And then add that to your image with:

COPY start.sh /
RUN chmod 755 /start.sh # if your build server doesn't have this permission set
CMD [ "/start.sh" ]

Answer 2

~/.bashrc wont run untill the shell is opened interactively, that's why no issues when you do docker exec which is interactive, see the first few lines of bashrc file :

# If not running interactively, don't do anything
case $- in
    *i*) ;;
      *) return;;
esac

you need to comment these lines.

If you just need one Environment variable, better get the value of PYTHON_PATH from your container and add the complete variable to your docker-compose.yml file.

Answer 3

尝试使用命令启动docker compose：

PYTHONPATH="$PYTHONPATH:/models/research:/models/research/slim" docker-compose up -d