I have recently upgraded one of my debian servers from version 10 to 11. My surprise when I wanted to mount my zfs pools after upgrade: zfs packages (zpool, zfs, etc) were missing. I have upgraded debian in the past and usually this problem was solved with:

dpkg-reconfigure zfs-dkms

. Not this time...

Digging more I found out some packages were missing so I had to install zfsutils-linux package:

I am not sure why it has been uninstalled, probably during the upgrade process but no worries, the installation was successful and zfs commands were available again :)

With SSD arriving more and more in our lives it is natural to find it on linux servers too. Not working with SSD in this area much, haven't found much interest of finding ssd related things in Linux so far. So, nowadays one can wonder wondering: how would I know if my disks in Linux are SSD or not? A valid response would be: close the system, open it up and see what disk you have there :))) But what if this is a linux server far far away?

This is simple and neat. Haven't found any use for it yet but worth to have it around :)

Run our fake SMTP server:

sonic:~# python -m smtpd -n -c DebuggingServer 192.168.11.22:25

Test our fake SMTP server:

venus:~# telnet 192.168.11.22 25
Trying 192.168.11.22...
Connected to 192.168.11.22.
Escape character is '^]'.
220 192.168.11.22 Python SMTP proxy version 0.2
^]
telnet> q
Connection closed.

Source: https://muffinresearch.co.uk/fake-smtp-server-with-

So, we need to increase the following OCFS2 partition which sits on a drbd volume (which sits on lvm2 volume). The grow steps have to be taken in the right order: lvm2, drbd and ocfs2.

This tutorial comes in text (below) and in youtube video (also below). Enjoy ;)

Check out my channel for other interesting videos.

This HUGE mousepad is something quite interesting for a mousepad. Hold one, what am I writing here?

I got this error today while trying to upgrade some php application:

Fatal error encountered: /var/www/html/libs/Zend/Db/Statement/Pdo.php(292): Allowed memory size of 134217728 bytes exhausted (tried to allocate 20480 bytes)

UPS :) Quick! Go check your memory limits... pull your hair out, run around the house senseless! WE ARE DOOMED! Well, the fix is easy.

This is based on official documentation but is simplified just for what I needed and hopefully is useful for you also.

1. Check debian version (in this case it is 10.8 - buster)

# cat /etc/debian_version 
# lsb_release -cs

2. Remove any existing docker installation (older versions that came with the OS, etc.)

NOTE: if nothing is removed, no problems.

# apt remove docker docker-engine docker.io containerd runc

3.

I have moved last month from home made redneck style rack shelves to a very nice servers cabinet from LanKATT. This model I have seen with different brands with just minors differences. So this tutorial is applicable basically to all racks with same components. Check out my channel for other interesting videos.

In order to cool down better my two mac mini servers, I have acquired two HUGE 200mm fans from Thermaltake. I did not necessary need the led lights but it turned out in server rack they look amazing. It is a short one.

Hello guys, In this article I will show you personal thoughts and tests regarding this HDD enclosure from Raidsonic: Icy Box IB-3805-C31. Check out my channel for other interesting videos.