Understanding DNS Resolution on Linux and Kubernetes
(jpetazzo.github.io)
I recently investigated a warning message on Kubernetes that said: DNSConfigForming ... Nameserver limits were exceeded, some nameservers have been omitted. This was technically a Kubernetes event with type: Warning, and these usually indicate that there’s something wrong, so I wanted to investigate it.
I recently investigated a warning message on Kubernetes that said: DNSConfigForming ... Nameserver limits were exceeded, some nameservers have been omitted. This was technically a Kubernetes event with type: Warning, and these usually indicate that there’s something wrong, so I wanted to investigate it.
3,200% CPU Utilization
(josephmate.github.io)
A while back my machine was so messed up that I could barely ssh onto it. 3,200% CPU utilization - all 32 cores on the host were fully utilized! Compare that to my last bug where it only used 1 core, 100%
A while back my machine was so messed up that I could barely ssh onto it. 3,200% CPU utilization - all 32 cores on the host were fully utilized! Compare that to my last bug where it only used 1 core, 100%
Troubleshooting: A skill that never goes obsolete
(autodidacts.io)
Much of what I do, in multiple fields, could be reduced to one skill: troubleshooting.
Much of what I do, in multiple fields, could be reduced to one skill: troubleshooting.
Defragging my old Dell's UEFI NVRAM
(artemis.sh)
I’m setting up an old Dell box (2011-era tech). I was migrating to some new boot drives and setting up grub on them again. Got to the point of deleting the old boot entries and adding new ones, and got an error like Could not prepare boot variable: No space left on device.
I’m setting up an old Dell box (2011-era tech). I was migrating to some new boot drives and setting up grub on them again. Got to the point of deleting the old boot entries and adding new ones, and got an error like Could not prepare boot variable: No space left on device.
Watt The Fox?
(h.43z.one)
I recently got a new notebook and noticed that the speakers would occasionally emit a faint but annoying white noise. This issue was only noticeable in a quiet room when no music or other audio was playing through the speakers.
I recently got a new notebook and noticed that the speakers would occasionally emit a faint but annoying white noise. This issue was only noticeable in a quiet room when no music or other audio was playing through the speakers.
Linux kernel cgroups writeback high CPU troubleshooting
(dasl.cc)
We’ve been upgrading the operating system from CentOS to Ubuntu on hosts across our fleet. Our CentOS hosts run an outdated Linux kernel version (3.10), whereas our Ubuntu hosts run a more modern kernel version (6.8). In August 2024, we began rolling out the Ubuntu upgrade across our Apache web servers. When we migrated larger portions of our fleet to Ubuntu, we began seeing elevated listen overflow errors.
We’ve been upgrading the operating system from CentOS to Ubuntu on hosts across our fleet. Our CentOS hosts run an outdated Linux kernel version (3.10), whereas our Ubuntu hosts run a more modern kernel version (6.8). In August 2024, we began rolling out the Ubuntu upgrade across our Apache web servers. When we migrated larger portions of our fleet to Ubuntu, we began seeing elevated listen overflow errors.
MTR: 'traceroute' and 'ping' in a single tool
(bitwizard.nl)
mtr combines the functionality of the 'traceroute' and 'ping' programs in a single network diagnostic tool.
mtr combines the functionality of the 'traceroute' and 'ping' programs in a single network diagnostic tool.
How to turn off Apple Intelligence
(asurion.com)
🚨 Setting up a new phone? Trouble connecting? No matter the issue, we can help.
🚨 Setting up a new phone? Trouble connecting? No matter the issue, we can help.
What's the Root Cause? – a quiz
(spike.sh)
You will see 6 real-world incidents with multiple root causes as options. Select the correct one. Good luck!
You will see 6 real-world incidents with multiple root causes as options. Select the correct one. Good luck!
Showkey: Examine Keyboard Codes
(cubiclenate.com)
I was having a peculiar issue with my computer where the “]” key kept getting pressed over and over again. It was very aggravating and I wasn’t sure where the problem was coming from. Neither my external keyboard nor the laptop keyboard would respond when I would press the “]” key and I was confused.
I was having a peculiar issue with my computer where the “]” key kept getting pressed over and over again. It was very aggravating and I wasn’t sure where the problem was coming from. Neither my external keyboard nor the laptop keyboard would respond when I would press the “]” key and I was confused.
Fixing my monitor's power button
(lkhrs.com)
Turning one of my monitors vertical appeared to exacerbate an issue with the power button to the point where it stopped working. I did my first soldering job in years and was able to get it working again, so I’m documenting it.
Turning one of my monitors vertical appeared to exacerbate an issue with the power button to the point where it stopped working. I did my first soldering job in years and was able to get it working again, so I’m documenting it.
Why is my CPU usage always 100%?
(downtowndougbrown.com)
If you’re new to this series, I’ve been documenting the process I went through upgrading my old PXA166-based Chumby 8’s 2.6.28 Linux kernel to a modern 6.x version.
If you’re new to this series, I’ve been documenting the process I went through upgrading my old PXA166-based Chumby 8’s 2.6.28 Linux kernel to a modern 6.x version.
Diagnosing an Unusual WiFi Issue (2020)
(ryuuta.net)
Late last year, I started experiencing some unusual intermittent connection issues on my Desktop.
Late last year, I started experiencing some unusual intermittent connection issues on my Desktop.
The number given as % CPU in Activity Monitor
(eclecticlight.co)
One of the most frequently quoted measurements in Activity Monitor is % CPU. When the fans blow, or a Mac becomes sluggish, it’s often the first figure to look at and wonder why that process is pulling over 100%.
One of the most frequently quoted measurements in Activity Monitor is % CPU. When the fans blow, or a Mac becomes sluggish, it’s often the first figure to look at and wonder why that process is pulling over 100%.
Ask HN: Proofpoint is blocking our emails. Any recourse?
(ycombinator.com)
We have a valid email domain that is battletested and used for sending out notifications, invoices, upgrade notices to customers.
We have a valid email domain that is battletested and used for sending out notifications, invoices, upgrade notices to customers.
Intel Core 13th and 14th Gen Desktop Instability Root Cause Update
(intel.com)
Following extensive investigation of the Intel® Core™ 13th and 14th Gen desktop processor Vmin Shift Instability issue, Intel can now confirm the root cause diagnosis for the issue. This post will cover Intel’s understanding of the root cause, as well as additional mitigations and next steps for Intel® Core™ 13th and 14th Gen desktop users.
Following extensive investigation of the Intel® Core™ 13th and 14th Gen desktop processor Vmin Shift Instability issue, Intel can now confirm the root cause diagnosis for the issue. This post will cover Intel’s understanding of the root cause, as well as additional mitigations and next steps for Intel® Core™ 13th and 14th Gen desktop users.
How to avoid a BSOD on your 2B dollar spacecraft
(clarkwakeland.com)
Short answer: turn it off and turn it back on
Short answer: turn it off and turn it back on
Stop macOS 15 Sequoia monthly screen recording prompts
(lapcatsoftware.com)
The good news is that there's a way to stop the prompts forever.
The good news is that there's a way to stop the prompts forever.
macOS firewall blocking web browsing after upgrading to Sequoia
(waclaw.blog)
It seems the OS firewall can sometimes start blocking access to web browsing after upgrading to macOS Sequoia. At least this was the case for me and some folks on Reddit.
It seems the OS firewall can sometimes start blocking access to web browsing after upgrading to macOS Sequoia. At least this was the case for me and some folks on Reddit.
Linux Horror Stories and Protection Spells (Volume I) (2021)
(blopig.com)
Don’t get me wrong. I love Linux. After many years of using it, I ended up appreciating how flexible, potent, and even beautiful it is. However, using Linux has never been a bed of roses and every single Linux user that I know has had to deal with many problems since the very beginning.
Don’t get me wrong. I love Linux. After many years of using it, I ended up appreciating how flexible, potent, and even beautiful it is. However, using Linux has never been a bed of roses and every single Linux user that I know has had to deal with many problems since the very beginning.
Problems with RPi Pico 2, RPi RP2350 Deepen as Projects Hit by Erratum E9
(hackster.io)
Raspberry Pi's new RP2350 microcontroller family continues to be the focus of considerable troubleshooting this week, as developers increasingly run into the side-effects of a design flaw known as erratum RP2350-E9 — with the result that some are cancelling designs built around the new chip, at least until a new stepping is released with the fault fixed.
Raspberry Pi's new RP2350 microcontroller family continues to be the focus of considerable troubleshooting this week, as developers increasingly run into the side-effects of a design flaw known as erratum RP2350-E9 — with the result that some are cancelling designs built around the new chip, at least until a new stepping is released with the fault fixed.
Microwave spontaneously turned on by its LED display
(stuffedcow.net)
My microwave oven started to malfunction at around five years old. It started to randomly power on the lamp, fan, and turntable. It progressively got worse over several weeks until it was mostly stuck on. The microwave oven is not usable when this happens: It behaves as if the door were open, causing the control panel to ignore button input and to stop cooking if it was cooking.
My microwave oven started to malfunction at around five years old. It started to randomly power on the lamp, fan, and turntable. It progressively got worse over several weeks until it was mostly stuck on. The microwave oven is not usable when this happens: It behaves as if the door were open, causing the control panel to ignore button input and to stop cooking if it was cooking.