Month: May 2020

3 Ways to Force Unmount Directory in Linux Showing “device is busy”

On linux when you try unmount say NFS service you might see umount device is busy message. Lets see how to fix this issue by force unmount in a graceful way.

Source: 3 Ways to Force Unmount Directory in Linux Showing “device is busy” (LinOxide)

ZRAM Boosts Raspberry Pi Performance

Linux is a two-edged sword. On the one hand, there’s so much you can configure. On the other hand, there’s so much you can configure. It is sometimes hard to know just what you should do to get the best performance, especially on a small platform like the Raspberry Pi. [Hayden James] has a suggestion: enable ZRAM and tweak the kernel to match.

Source: ZRAM Boosts Raspberry Pi Performance | Hackaday
Also see: Raspberry Pi Performance: Add ZRAM and these Kernel Parameters (hayden-james@linux:~$ _)

iRaspbian Makes Your Raspberry Pi Work Like a Mac

Note: If you can’t find this anymore try reading the comments under the YouTube video.

This new Raspbian skin looks just like Apple Mac OS X.

Source: iRaspbian Makes Your Raspberry Pi Work Like a 2001 Mac | Tom’s Hardware

Adding Ethernet to a Raspberry Pi Zero

If you have ever wanted to use a Raspberry Pi Zero with a wired Ethernet port, the article linked below shows an easy and inexpensive way to do it. Sure, you can always use one of those Ethernet to USB dongles but those cost more, and where’s the fun in that?

Adding Ethernet to a Pi Zero

Adding an Ethernet port to a Raspberry Pi Zero is quick and easy using a cheap ENC28J60 ethernet module. Start your Pi Zero Ethernet upgrade project now.

Source: Adding Ethernet to a Pi Zero – Raspberry Pi Spy

My Favourite Secret Weapon – strace

Why strace?

I’m often asked in my technical troubleshooting job to solve problems that development teams can’t solve. Usually these do not involve knowledge of API calls or syntax, rather some kind of insight into what the right tool to use is, and why and how to use it. Probably because they’re not taught in college, developers are often unaware that these tools exist, which is a shame, as playing with them can give a much deeper understanding of what’s going on and ultimately lead to better code.

My favourite secret weapon in this path to understanding is strace.

Source: My Favourite Secret Weapon – strace – zwischenzugs

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