The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for April 13th, 2022

Kris on Twitter is a bit radical against shell scripts. Learn why.

Posted by jpluimers on 2022/04/13

I say to people: only use shell interactively, don’t write scripts. Never. Not one.
But Kris, they ask, why so radical?
Because of this:

is the literal English Google Translation of the German text

Ich sage den Leuten: benutzt Shell nur interaktiv, schreibt keine Scripte. Nie. Nicht eines.
Aber Kris, fragen sie, wieso so Radikal?
Deswegen:

then links to [Wayback/Archive] Jan Schaumann on Twitter: “TIL zgrep(1) is a shell script. BSD basically does “zcat | grep”, but GNU does “gzip -dc | sed”. How did I learn that? The fun way! CVE-2022-1271, arbitrary-file-write and code execution vulnerability in GNU zgrep / gzip. …”:

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Posted in *nix, *nix-tools, Apple, ash/dash, ash/dash development, bash, bash, BSD, Development, Mac, Mac OS X / OS X / MacOS, Power User, Scripting, Software Development | Leave a Comment »

Run ESXi from a USB Flash Drive: A How-To-Guide

Posted by jpluimers on 2022/04/13

Guessing the [Wayback] Run ESXi from a USB Flash Drive: A How-To-Guide by just the abstract does not show the value enough:

A USB flash drive can be used not only for installation media – you can also run ESXi from USB flash drives or SD flash cards and boot from these devices.

In fact, the article shows way more, including:

  • how the partitions on USB/SD devices are built as compared to HDD devices, and how they even differ depending on USB/SD sizes
  • how to backup/restore the USB/SD boot devices (so you can stock them in case of failure)

This is very important, because every now and then, these USB and SD devices fail (see for instance [Wayback] Solved: Remount boot filesystem on a running system. – VMware Technology Network VMTN), so knowing what to do then is key and helps handling errors like this one:

Lost connectivity to the device mpx.vmhba32:C0:T0:L0 backing the boot filesystem /vmfs/devices/disks/mpx.vmhba32:C0:T0:L0. As a result, host configuration changes will not be saved to persistent storage.

A every useful article for my link archive!

Related: ESXi: storing an ISO 8601 time-stamped backup tarball locally

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Posted in ESXi5, ESXi5.1, ESXi5.5, ESXi6, ESXi6.5, ESXi6.7, ESXi7, Power User, Virtualization, VMware, VMware ESXi | Leave a Comment »