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Welcome

This website is a multi-language CMS / Blog I build with Python, the framework Flask and SQLAlchemy. It is deployed on my ISPConfig3 (Nginx + Mariadb) server using Docker which is also used for development. Read more about this website.

Coronavirus

I investigated the deaths in The Netherlands in 2020 and looking at the data, I can only wonder why we have never had, and still do not have, a serious discussion about reopening the economy for people under 65 or, for example, people under 50. Read the findings and conclusions.

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Bootstrap 4.1 blog post grid with three columns, two breakpoints and re-ordering

1 June 2019 0

Peter

post main image For this blog I wanted the blog post page to have three 'columns'. Why did I quote the word columns? Because what is a column on a large screen can be a row on a mobile device. Bootstrap uses containers, rows and columns. And of course, a Bootstrap column can show on the screen as a column or a row. Help! When designing a layout we must not think about columns but about screen elements and how we ...

Reducing the size of a Python application Docker image using Python wheels

10 March 2019 1

Peter

post main image When using docker we want the size of the docker image to be minimal. Why? Many reasons. Memory footprint is one especially when running many Python Flask websites on an ISPConfig3 server.  Fortunately, from docker 17.05 we can use multistage builds. Using this we reduce our image size from 376MB to 211MB! Below are two images we can use: > docker images python 3.6-alpine 1837080c5e87 5 ...

Make Alembic detect column type changes and change the length of string fields

9 March 2019 1

Peter

post main image By default Alembic does not change the length of string fields, I noticed this after changing a string field from: description = Column(String(150), server_default='') to: description = Column(String(250), server_default='') No changes were made. It appears that column type change detection is off by default, so you can test it first, and can be turned on by adding 'compare_type=True' to the context. ...

Python Flask app on Docker in ISPConfig3 with Nginx - Part 1: Minimal app

13 February 2019 0

Peter

post main image This is a post showing how to run a Flask app on ISPConfig3. Why? I have a VPS on the internet running Debian and ISPConfig3. It is running static sites and PHP sites. But now I also want to run my Flask python apps here. This way I can use the domain management I am used to and do not need an extra server for Python apps. This solution uses Docker to run the Flask app, printing 'Hello world', and ...