Category Archives: Technical

“Rational” IT related entries.

How to change the order of your names on Facebook today?

This blog is a collection of my technical notes from working with information systems, not intended for the general public. However, Facebook’s user interface has become so convoluted that even simple tasks require a bit of technical knowledge and patience. … Continue reading

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A trick to prevent Cyberduck from asking for a client certificate on macOS

Problem: Cyberduck on macOS will repeatedly prompt you to present a client certificate when making an FTP-SSL connection to certain servers (e.g. Synology). This issue arises if your macOS Keychain contains at least one personal certificate. If the server connection … Continue reading

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Authentik: set custom username for OAuth application (e.g. for Apache Guacamole) via a property mapping

If you use Authentik (https://goauthentik.io/) as an OAuth authentication provider for your Apache Guacamole (https://guacamole.apache.org/) instance and you’d like to customize usernames for Guacamole, here’s how you can achieve this. The steps described below may work for other applications, wired … Continue reading

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Guacamole 1.4: “Creation of WebSocket tunnel to guacd failed”

Problem: Guacamole 1.4 shows “internal error” when making any connection and in /var/log/tomcat9/catalina.out you see something like:

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Guacamole 1.4: “Log in failed” for RDP connections

Problem (Guacamole 1.4 while connecting to an RDP server): …and in logs:

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Serving acme-challenges from two web-servers sharing the same domain via nginx

Say you have nginx listening on port 80 and sharing a domain with another web-server (e.g. Proxmox web-server) that is listening on a different port, and you want to route HTTP-01 (“acme-challenge”) requests to that second web-server.

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Confluence: broken links and macros after migrating Postgres database

Problem: after migrating Atlassian Confluence PostgreSQL database to another server, you’re seeing lots of broken links (in red color) and some navigation macros not working properly (showing errors such as “page not found”). The first thing Atlassian themselves and their … Continue reading

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Zola + Vite demo

How to neatly wire up Zola (static site generator) with Vite (frontend build tool) without special plugins (a minimal demo).

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Postgres database on a separate drive

In psql: CREATE TABLESPACE mytablespace LOCATION ‘/Volumes/MyVolume/postgres’; CREATE DATABASE mydatabase TABLESPACE mytablespace; Kudos to GregHNZ for posting this on StackOverflow.

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Django + Vue CLI + Webpack demo

How to wire up a Vue CLI app and Webpack to Django templates with routing, hot reload, code-splitting and without any extra plugins (a minimal demo + explanation).

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