Python: fake smtp server

Submitted by root on Sat, 09/25/2021 - 13:04

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-python/

Debian DRBD: How to resize drbd and OCFS2 online

Submitted by root on Sat, 06/12/2021 - 08:21

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.

Mousepad Logitech G840

Submitted by root on Fri, 05/14/2021 - 02:22

This HUGE mousepad is something quite interesting for a mousepad. Hold one, what am I writing here? It's just a HUGE MOUSEPAD!

Check out my channel for other interesting videos.

Docker: how to increase php memory "the docker way"

Submitted by root on Tue, 04/20/2021 - 21:09

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. Read on (or watch the video).

Docker: Install on Debian

Submitted by root on Tue, 04/13/2021 - 17:02

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.

How to build a 25U 600x600 Server Rack

Submitted by root on Fri, 04/02/2021 - 19:46

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.

Thermaltake Pure 20 fan - HUGE and quiet!

Submitted by root on Mon, 03/29/2021 - 11:45

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. Enjoy it and subscribe if you find my things interesting there.

Check out my channel for other interesting videos.

Speed test of Icy Box IB-3805-C31, a 5 disks enclosure from Raidsonic

Submitted by root on Mon, 03/29/2021 - 11:39

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.

Ubiquiti EdgeRouter X - thoughts and tips

Submitted by root on Thu, 02/04/2021 - 00:31

I have been using EdgeRouter X for about five months now and it is amazing! It has awesome features at an affordable price. Win win situation in my book.
Truth to be told, it is not for average consumer. I am not saying it is difficult to be configured but to benefit fully from it you need to know linux and networking.

Qnap TR-004 short review - why I cannot use it

Submitted by root on Sat, 01/30/2021 - 02:20

I have bought Qnap TR-004 recently to use it as simple external enclosure with disks set in individual mode for a linux server. In other words: I had all disks visible separately in the system.
Unfortunately I had to return it for 2 reasons, important for my needs:

1. Inserting or removing a disk interrupts the USB connection with the computer

LVM: Device /dev/sXXX excluded by a filter.

Submitted by root on Thu, 01/28/2021 - 17:19

This error, is normal if you want to add a disk or partition to LVM and was previously used.
For example, below I was trying to add /dev/sdb1 to LVM:

13:59:10 root@eeny:~# pvcreate /dev/sdb1
  Device /dev/sdb1 excluded by a filter.

When you see this, usually a disk wipe can fix it.
!!! WARNING - THIS WILL DESTROY YOUR DATA SO BE SURE YOU DO NOT NEED ANYTHING ON THIS DRIVE BEFORE EXECUTING THIS COMMAND !!!

ESXi: A bunch of useful commands and information

Submitted by root on Sun, 01/24/2021 - 19:31

How to list network adapters:

[root@mini:~] esxcli network nic list
Name    PCI Device    Driver  Admin Status  Link Status  Speed  Duplex  MAC Address         MTU  Description
------  ------------  ------  ------------  -----------  -----  ------  -----------------  ----  -----------
vmnic0  0000:01:00.0  ntg3    Up            Up            1000  Full    68:5b:35:7f:07:8d  9000  Broadcom Corporation NetXtreme BCM57766 Gigabit Ethernet

ESXi: How to change the hostname of an ESXi host

Submitted by root on Sun, 01/24/2021 - 19:18

For this procedure you need to enable SSH access to your ESXi host.

You can change the hostname, also fqdn if you want, via two commands. Both will be shown below.

NOTE: In this example, I will change fqdn (meaning hostname.domain).

Via esxcfg-advcfg:

[root@local:~] esxcfg-advcfg -s mini.local /Misc/hostname
Value of HostName is mini.local

or via esxcli command:

ESXi: How to create a bootable USB installer of ESXi 7.0

Submitted by root on Sun, 01/24/2021 - 18:56

Of course, the easiest way would be to use rufus via windows but if you do not have a windows around, you need a different approach.
Under macOS there is balenaEtcher but for unknown reasons it doesn't detect the ESXi image as bootable and the result is not bootable either.

What's left is a manual approach, via terminal, that should work under macOS or Linux.
Below is a way to do this under macOS. Under linux is not that different: you need to use fdisk -l instead of diskutil list.

Create ISO image from macos installer

Submitted by root on Sat, 01/23/2021 - 23:28

1. Download the installers from the Mac App Store. If they are no more listed, below links are for:

Macos Mojave
Macos Catalina

Mac Mini: create bootable ESXi install usb stick

Submitted by root on Tue, 01/12/2021 - 00:50

Short and sweet: you need to create a bootable ESXi USB stick and the "normal" method was not doing it.
In my situation, I was using balenaEtcher but even if it was successful, the USB stick was not bootable. The tool did warned me when I have selected the ESXi iso.

So here we are. In order to create a bootable ESXi usb stick, you need to have:
1. ESXi iso image from vmware website (https://my.vmware.com/group/vmware/evalcenter?p=free-esxi7)
2. An empty USB stick.

Macports: Current platform "darwin 20" does not match expected platform "darwin 19"

Submitted by root on Sat, 11/28/2020 - 23:29

Switched from Catalina to BigSur and as normal this pops out when trying to upgrade macports:

Debian on mac mini: Core temperature above threshold, cpu clock throttled

Submitted by root on Mon, 11/16/2020 - 22:43

Seeing this when running dmesg?

Lilnux (debian): How to switch from pc to efi and recreate boot partition

Submitted by root on Sat, 11/07/2020 - 11:41

You need to swich from bios to efi? Read on.
DISCLAIMER: you need to be familiar with these commands and make sure you have backup because you may destroy your linux if you do not pay attention.

1. List the existing partiton

# fdisk -l /dev/sda
Output:

Docker: syslog-ng setup

Submitted by root on Thu, 09/17/2020 - 23:42

In this article I will show you how to create and set up a syslog-ng in docker container and redirect logs from another container to it.
You should have already a running docker set up. If you do not know how to do that, do a search on this page as I have created several articles for it. Also, web is full of it.

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Python: fake smtp server

Run our fake SMTP server:

Test our fake SMTP server:

Debian DRBD: How to resize drbd and OCFS2 online

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

Mousepad Logitech G840

Docker: how to increase php memory "the docker way"

Docker: Install on Debian

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

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

How to build a 25U 600x600 Server Rack

Thermaltake Pure 20 fan - HUGE and quiet!

Speed test of Icy Box IB-3805-C31, a 5 disks enclosure from Raidsonic

Ubiquiti EdgeRouter X - thoughts and tips

Qnap TR-004 short review - why I cannot use it

I have bought Qnap TR-004 recently to use it as simple external enclosure with disks set in individual mode for a linux server. In other words: I had all disks visible separately in the system.
Unfortunately I had to return it for 2 reasons, important for my needs:

1. Inserting or removing a disk interrupts the USB connection with the computer

LVM: Device /dev/sXXX excluded by a filter.

ESXi: A bunch of useful commands and information

How to list network adapters:

ESXi: How to change the hostname of an ESXi host

You can change the hostname, also fqdn if you want, via two commands. Both will be shown below.

ESXi: How to create a bootable USB installer of ESXi 7.0

Create ISO image from macos installer

1. Download the installers from the Mac App Store. If they are no more listed, below links are for:

Mac Mini: create bootable ESXi install usb stick

Macports: Current platform "darwin 20" does not match expected platform "darwin 19"

Debian on mac mini: Core temperature above threshold, cpu clock throttled

Lilnux (debian): How to switch from pc to efi and recreate boot partition

1. List the existing partiton

Docker: syslog-ng setup

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Syndicate

Run our fake SMTP server:

Test our fake SMTP server:

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

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

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

I have bought Qnap TR-004 recently to use it as simple external enclosure with disks set in individual mode for a linux server. In other words: I had all disks visible separately in the system. Unfortunately I had to return it for 2 reasons, important for my needs:

1. Inserting or removing a disk interrupts the USB connection with the computer

How to list network adapters:

You can change the hostname, also fqdn if you want, via two commands. Both will be shown below.

1. Download the installers from the Mac App Store. If they are no more listed, below links are for:

1. List the existing partiton

Pages

Recent content

Search form

Syndicate

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

I have bought Qnap TR-004 recently to use it as simple external enclosure with disks set in individual mode for a linux server. In other words: I had all disks visible separately in the system.
Unfortunately I had to return it for 2 reasons, important for my needs: