Blog

  • IPv6, why don't you enable it already?

    Recently at work I just did regular work-things. I logged on to my PC, opened my E-Mail client(s), read some mail, SSHed into one of our servers, started VSCode.... all that stuff. However some things were weird. I was looking stuff up on the internet - googling stuff, but some websites wouldn't load.

    Monday, 15 May, 2023 - 16:38 Simon Comments 0

  • Reverse engineering the Controllino Helium Hotspot

    What's inside? How does it work? What else can it do?

    Sunday, 17 July, 2022 - 16:39 Simon Comments 0

  • The performance reducing database cache

    What happens if you don't understand what the system is doing behind your back

    Friday, 12 March, 2021 - 22:20 Simon Comments 0

  • My Trezor destroyed over 1000€!

    Transaction fees aren't the only thing. Be careful not to run out of gas.

     

    Tuesday, 12 January, 2021 - 19:03 Simon Comments 0

  • Running old Cisco ASDM

    How to start the old Cisco firewall management utility on modern Linux systems

    Monday, 11 January, 2021 - 10:05 Simon Comments 0

  • Hoher Lastdurchschnitt

    Sehr wenig CPU- und Festplattenaktivität. Was könnte es sein? Auf einem unserer Proxmox 6-Server hatten wir kürzlich das Problem, dass Icinga sich ständig über einen hohen Lastdurchschnitt beschwerte. Der Lastdurchschnitt selbst ist eine seltsame Metrik, er misst die Länge der Ausführungswarteschlange. Das bedeutet, die Anzahl der Prozesse die darauf warten, ausgeführt zu werden. Dies kann entweder daran liegen, dass sie darauf warten, dass die CPU-Zeit verfügbar wird, oder dass Daten von der Festplatte eingehen.

    Thursday, 1 October, 2020 - 17:52 Simon Comments 0

  • High load average

    But very little CPU and disk activity. What could it be?

    On one of our Proxmox 6 servers we recently had the issue of Icinga constantly complaining about a high load average. The load average itself is a bit of a weird metric, it measures the length of the run queue. That means how many proceses are waiting to get run - this could either be because they are waiting for CPU time to become available or data to arrive from the disk.

    Thursday, 1 October, 2020 - 17:52 Simon Comments 0

  • Die selbstlöschende Benutzertabelle

    Vor vielen Jahren habe ich eine Website "geerbt", die viele benutzergenerierte Inhalte enthält. Ich kann hier nicht auf Details eingehen, um die unschuldigen Schuldigen - und mich selbst - zu schützen.

    Wednesday, 26 December, 2018 - 11:43 Simon Comments 0

  • The self deleting user table

    Many years ago I "inherited" a website which contains a lot of user generated content. I can't go into details here in order to protect the innocent guilty - and myself.

    Wednesday, 26 December, 2018 - 11:43 Simon Comments 0