Why does conda install tk not work in my docker co

I was having issues with tk in my python 3 docker container.

I tried:

conda install tk

but it says it did install it

root@36602e2cd649:/home_simulation_research/overparametrized_experiments/pytorch_experiments# conda install tk
Fetching package metadata ...........
Solving package specifications: .

# All requested packages already installed.
# packages in environment at /opt/conda:
#
tk                        8.6.7                h5979e9b_1

but when I go to python and try to import it it does not work:

>>> import Tkinter
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named 'Tkinter'

and other errors:

>>> import tkinter
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/conda/envs/pytorch-py35/lib/python3.5/tkinter/__init__.py", line 35, in <module>
    import _tkinter # If this fails your Python may not be configured for Tk
ImportError: libX11.so.6: cannot open shared object file: No such file or directory

when I run a script that needs it:

Traceback (most recent call last):
  File "bulk_experiment_dispatcher.py", line 18, in <module>
    from data_file import *
  File "/home_simulation_research/overparametrized_experiments/pytorch_experiments/data_file.py", line 16, in <module>
    import matplotlib.pyplot as plt
  File "/opt/conda/envs/pytorch-py35/lib/python3.5/site-packages/matplotlib/pyplot.py", line 115, in <module>
    _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
  File "/opt/conda/envs/pytorch-py35/lib/python3.5/site-packages/matplotlib/backends/__init__.py", line 32, in pylab_setup
    globals(),locals(),[backend_name],0)
  File "/opt/conda/envs/pytorch-py35/lib/python3.5/site-packages/matplotlib/backends/backend_tkagg.py", line 6, in <module>
    from six.moves import tkinter as Tk
  File "/opt/conda/envs/pytorch-py35/lib/python3.5/site-packages/six.py", line 92, in __get__
    result = self._resolve()
  File "/opt/conda/envs/pytorch-py35/lib/python3.5/site-packages/six.py", line 115, in _resolve
    return _import_module(self.mod)
  File "/opt/conda/envs/pytorch-py35/lib/python3.5/site-packages/six.py", line 82, in _import_module
    __import__(name)
  File "/opt/conda/envs/pytorch-py35/lib/python3.5/tkinter/__init__.py", line 35, in <module>
    import _tkinter # If this fails your Python may not be configured for Tk
ImportError: libX11.so.6: cannot open shared object file: No such file or directory

I tried apt-get install python-tk (from Install tkinter for Python) but it did not work:

root@36602e2cd649:/home_simulation_research/overparametrized_experiments/pytorch_experiments# apt-get install python-tk
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package python-tk

I tried running ENTERYPOINT as one of the answers suggested but it threw me some more errors:

/path/fake_gui.sh: 8: /home_simulation_research/overparametrized_experiments/docker_files/runtime/fake_gui.sh: source: not found
/path/fake_gui.sh: 12: /home_simulation_research/overparametrized_experiments/docker_files/runtime/fake_gui.sh: function: not found
/path/fake_gui.sh: 13: kill: invalid signal number or name: SIGTERM
/path/fake_gui.sh: 15: /home_simulation_research/overparametrized_experiments/docker_files/runtime/fake_gui.sh: Syntax error: "}" unexpected

but not sure what to do...

Helpful questions:

How to install python-tk in my docker image

回答1:

You need to use a Docker container that has a virtual framebuffer installed and running.

This blog post explains the "Why and How" of putting X11 into a docker container.

You can see how they're doing it in the Selenium Docker container via their entry_point.sh:

#!/bin/bash
#
# IMPORTANT: Change this file only in directory Standalone!

source /opt/bin/functions.sh

export GEOMETRY="$SCREEN_WIDTH""x""$SCREEN_HEIGHT""x""$SCREEN_DEPTH"

function shutdown {
  kill -s SIGTERM $NODE_PID
  wait $NODE_PID
}

if [ ! -z "$SE_OPTS" ]; then
  echo "appending selenium options: ${SE_OPTS}"
fi

SERVERNUM=$(get_server_num)

rm -f /tmp/.X*lock

xvfb-run -n $SERVERNUM --server-args="-screen 0 $GEOMETRY -ac +extension RANDR" \
  java ${JAVA_OPTS} -jar /opt/selenium/selenium-server-standalone.jar \
  ${SE_OPTS} &
NODE_PID=$!

trap shutdown SIGTERM SIGINT
wait $NODE_PID

Source for the above code is from this repository on GitHub, SeleniumHQ/docker-selenium.

回答2:

Ok so once I put a dummy screen in the image it stopped crashing:

RUN apt-get update
RUN apt-get install -y xvfb
#RUN Xvfb :1 -screen 0 1024x768x16 &> xvfb.log  &

when I ran my docker image.

回答3:

With python 3, you must import as follows:

import tkinter   # with a small caps 't'