Create iptables firewall that will be used to control incoming and outgoing traffic.
Display upcoming events in Nextcloud calendar using text-based terminal emulator because it is fun and challenging.
Dynamically choose HAProxy backend depending on the HTTP host header, Lua programming language and environment variable.
Detect and log changes in the list of mounted filesystems (/proc/self/mountinfo file).
Use GNU Bourne-Again SHell builtin or standalone time command to determine process execution time.
Use cron service to execute additional commands as specified user using cron during system startup.
Recently, I have moved my personal source code to GitLab. It rendered self-hosted git repository at repository.sleeplessbeastie.eu obsolete, so I have created simple redirection on HAProxy load balanced to cover this specific case.
Store LeaseWeb data traffic in OpenTSDB time series database using Python sript, LeaseWeb API v2 and Python client to OpenTSDB.
Serve files from memory with a fallback using nginx HTTP server.