DATAPUISTOKEMISTI

There is a lot of false information online about Mercedes-Benz auxiliary heaters. To set the record straight: you cannot pair a standard Webasto-branded remote to a factory-installed Mercedes system, and you absolutely should not pull any fuses to initiate the pairing process. These instructions have been verified on 2010 GL X164 with factory option 228 and remote with part number  A2218203797. Hardware and Compatibility This applies exclusively to Telestart T100 remotes featuring the Mercedes-Benz logo and for vehicles with factory option code 228 or B24 (AUXILIARY HEATER) on the datacard. If your vehicle has any other factory or non-factory heater than Webasto Telestart T100 these instructions DO NOT APPLY. A2218203797: Fits 228 optioned vehicles with delivery date between 2007-07-09 to 2011-08-11. Chassis types W164 (ML), X164 (GL), W204 (C), W207 (E), W211 (E), W212 (E), W216 (CL), W218 (CLS), W219 (CLS), W221 (S), and W251 (R). A1668201097 :  Newer version of above...

 I wanted to add some redundancy by mirroring disk. So I did it. Notice "-s" in zpool attach command so resilvering is done sequentially.

So you screwed up and created zpool using /dev/sdb instead of /dev/disk/by-id/ata-* as a device? Then you tried to fix it and ended up with cryptic wwn- as device name. Here's dirty solution. Make sure to run those commands right after each other. Otherwise it will get imported back with wrong device names automatically -- before you have time to do it with correct names.

Laptop powers on but nothing on screen. This is often because eeprom (Winbond W25Q32FVSIQ, 32Mbit / 4MB, 2.7V - 3.6V, SPI/QPI) loses programming over time and one day laptop will simply no longer boot. At first it will blink some leds on keyboard and turns off. Then it will degrade to just beeping on boot.

Toggling "Visible to users" setting on portal adds / removes tag called HideApp.

Microsoft provides weekly updated list of IP addresses used by various Azure features as downloadable JSON file on their webpage. Automating download of it is however not supported and prone to breakage. Same information is now also available via Azure Service Tag Discovery API. New API is still in public preview state and list of IPs it provides is far less than downloadble file contains. So either list of IPs from API is tailored for your particular subscription or it is incomplete. Discovery API requires authenticated session to Azure so we need to create service principal and custom RBAC role to keep things secure. See you for more after the break.

There's really bizarre bug in RHEL7 / CentOS7. Once per hour NetworkManager will remove IP addresses from ethernet interface after hitting some bug and triggering "link loss" action. Interface may come back by itself or may not. It does come back when you login as root on console as login triggers some repair action part via systemd...