Author Archives: ChristianKreuzberger

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Those that have subscribed to my YouTube channel, might have noticed that the content has changed a bit away from Django, with more focus on Docker, Kubernetes, and Keptn.

With that in mind, I would like to share you my recent video series here:

Create Docker Containers for GoLang, NodeJS and Python: https://www.youtube.com/watch?v=oZfPbKZDS8U

How to create a new Keptn project for continuous delivery: https://www.youtube.com/watch?v=7EYVHjOfQTQ

Would love to get some feedback directly on the videos if they are helpful! Thanks!

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In one of my recent videos I've disussed the size of the Django/Python Docker Containers and how to decrease it:

I failed to successfully create an image based on alpine, which is known to be very slim. With the help of Aaron Goodrich, who posted a comment with a Dockerfile for alpine, I was able to finally create such an image 🙂 Thanks for the help!

Without further ado, here are the results (and the respective Dockerfiles).

Please note that I have slightly changed the Dockerfile compared to the video above.

Based on Python 3.5 Jessie: 740 MB

FROM python:3.5-jessie

COPY ./app /app
WORKDIR /app

RUN pip install --no-cache-dir -r requirements/dev.txt

Based on Python 3.5 Slim: 188 MB

FROM python:3.5-slim

COPY ./app /app
WORKDIR /app

RUN pip install --no-cache-dir -r requirements/dev.txt

Based on Python 3.5 with Alpine: 248 MB

FROM python:3.5-alpine

COPY ./app /app
WORKDIR /app

RUN apk add --update --no-cache postgresql-client && \
    apk add --update --no-cache --virtual .temp-build-deps gcc libc-dev linux-headers postgresql-dev

RUN pip install --no-cache-dir -r requirements/dev.txt

RUN apk del .temp-build-deps gcc libc-dev linux-headers postgresql-dev

• 2 Comments

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Ever had one of these issues with Pycharm 2018 and Docker?

Couldn't refresh skeletons for remote interpreter
The docker-compose process terminated unexpectedly: /usr/local/bin/docker-compose -f docker-compose.yml -f .PyCharm2018.3/system/tmp/docker-compose.override.8.yml run --rm --name skeleton_generator_643129755 python
Regenerate skeletons

or

can't open file '/opt/.pycharm_helpers/pycharm/django_test_manage.py' + "No such file or directory"

Then you should clear all pycharm helpers from your docker containers and images:

docker ps -a | grep -i pycharm | awk '{print $1}' | xargs docker rm
docker images | grep -i pycharm | awk '{print $3}' | xargs docker rmi

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Sometimes I just love how the open source community works nowadays! Sometimes you  use your favourite search engine to find a package/repository/etc..., just to find out thatit contains a quickstart info, a proper package.json or docker-compose.yml. All you need to do is "npm install && npm run" or "docker-compose build && docker-compose up" and you are good to go.

This helps devs to contribute to open source software soooooo much!

TL;DR: Use Docker, package.json, requirements.txt, and for the love of god, write a Quickstart section into your Readme!

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If you have ever gotten this error with your mod passenger installation:

$ passenger-config restart-app
*** ERROR: Phusion Passenger doesn't seem to be running. If you are sure that it
is running, then the causes of this problem could be one of:

1. You customized the instance registry directory using Apache's
 PassengerInstanceRegistryDir option, Nginx's
 passenger_instance_registry_dir option, or Phusion Passenger Standalone's
 --instance-registry-dir command line argument. If so, please set the
 environment variable PASSENGER_INSTANCE_REGISTRY_DIR to that directory
 and run this command again.
 2. The instance directory has been removed by an operating system background
 service. Please set a different instance registry directory using Apache's
 PassengerInstanceRegistryDir option, Nginx's passenger_instance_registry_dir
 option, or Phusion Passenger Standalone's --instance-registry-dir command
 line argument.

Then you most likely have SystemD running, which uses PrivateTmp folders instead of /tmp folders.

It's annoying, but easy to fix, see this blog post:
https://www.pistolfly.com/weblog/en/2016/01/passenger-config-and-passenger-status-result-in-an-error-on-centos7.html