Kurztipp

Short tip: Rootless Podman + docker-compose under Fedora

Sep 29, 2022 · 2 min read · docker fedora podman kurztipp ·

Since 2018, there has been a very elegant and lean container runtime, Podman, as an alternative to Docker. Podman offers a smaller attack surface due to omitted background services and is also often pre-installed on Red Hat-like operating systems. With a few tricks, existing docker-compose configurations can still be …
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Short tip: brltty interferes with esptool.py under Pop!_OS

Aug 28, 2022 · 2 min read · esp8266 kurztipp popos ·

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When using ESPHome or esptool.py under Pop!_OS 22.04 I recently encountered the problem that development boards (ESP8266, ESP32) could not be flashed:

 1$ esphome upload hurrdurr.yml
 2INFO Reading configuration hurrdurr.yml...
 3esptool.py v3.3.1
 4Serial port /dev/ttyUSB0
 5Connecting....
 6Chip is ESP8266EX
 7 …

Short tip: Partial Commits with VSCode

Jan 25, 2022 · 1 min read · kurztipp ·

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One of the most important Git best practices is to write commits as atomic as possible - that is, to submit as few changes as possible, but as many as necessary. The advantage is obvious: commits can be reverted individually using git revert. If you mix bug fixes and new features wildly in one commit, you will undo …
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Short tip: Nextcloud + 2FA + CalDAV and CardDAV under iOS

Jan 22, 2022 · 1 min read · nextcloud kurztipp ·

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While setting up my Nextcloud calendar on an iOS device the other day, I encountered the following error:

1CalDAV account verification failed

The error also affected contacts via CardDav - the usual troubleshooting options failed:

Password reset
Using another device
Use different URL and port combinations

Finally, I …

Short tip: Shelly Plug does not find newer firmware

Dec 4, 2021 · 1 min read · kurztipp ·

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The Shelly Plug WLAN socket adapters from the Bulgarian manufacturer Allterco are very popular. They are inexpensive and - unlike other alternatives - also allow switching without cloud constraints via their own MQTT broker. However, some devices come with severely outdated firmware, for which the search for updates …
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Short tip: Java applications and HiDPI

May 2, 2021 · 1 min read · kurztipp ·

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Legacy software is often used longer than planned. Running older Java software on high-resolution displays with more than 1080p is quite hard by default.

To fix this, manually setting scaling via command-line pararameters is sufficient:

1$ java -Dsun.java2d.uiScale=3.5 -jar app.jar

In this case, 3.5x or 350% scaling is …

Short tip: Convert SLES4SAP 12 to SLES 12

Nov 11, 2020 · 2 min read · kurztipp sles ·

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While there are scripts for migrating SLES to SLES4SAP, there are no tools the other way around. If you deployed the wrong template by mistake you can change the product without reinstallation with some manual steps. A comparable procedure has also been documented by the vendor for installing SUSE Manager.

First of …

Short tip: VMware vSphere 6.7 Guest Customization and openSUSE Leap 15.2

Sep 24, 2020 · 2 min read · kurztipp ·

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When automatically customizing openSUSE 15.2 guests under VMware vSphere 6.7 recently, I stumbled upon the famous "Guest Customization failed" issue (once again).

After eliminating the most common error (not having Perl installed which is necessary) I had a look at the VMware Compatibility Guide. Looks like …

Short tip: WSL + Ansible = 'Failed to create temporary directory'

Aug 24, 2020 · 1 min read · ansible kurztipp wsl ·

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When using Ansible under WSL (Windows Subsystem for Linux) recently, I stumbled upon the following error:

1Failed to create temporary directory.
2In some cases, you may have been able to authenticate and did not have permissions on the target directory. Consider changing the remote tmp path in ansible.cfg to a path …

Short tip: FreeIPA - CA did not start in 300.0s

Jun 5, 2020 · 1 min read · freeipa kurztipp ·

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During a recent installation of Red Hat Identity Management or FreeIPA I stumbled upon the following error message:

1DEBUG The ipa-server-install command failed, exception: RuntimeError: CA did not start in 300.0s
2ERROR CA did not start in 300.0s
3ERROR The ipa-server-install command failed. See /var/log/ipaserver- …