Keith Rose | Senior Network & Security Engineer

Engineer by Day, Hacker by Night.

Mikrotik Voltage Alarm/Beeper

I recently needed to make my routerboard generate an audible alarm based on voltage thresholds on the 12v battery wired directly to the RB2011. This script was a modification of something i found when perusing the Mikrotik forums. Change lowvoltage and highvoltage to suite your requirements. #set lowvoltalarm to desired alarm voltage in tenths of
Read More
  • By -keith
  • Posted on
  • Posted in Tech

ZESA Tarrif Calculator

Recently saw an article in the herald about the new tiered tarrif structure for Kwh/units. Here is a calculator to help you estimate your monthly budget with the new structure. (Distributed under GPLv3 – feel free to do what you like with it) https://github.com/wraythezw/zw-zesa-calculator The live site is available here – https://zesa.keithro.se/

Docker | Asterisk 16

While working on another project, (Callcenter suite) – i built a relatively lightweight Asterisk 16 image which was being used as the base image for a series of ARI tests. I decided to release this to the open-source community, to try and motivate more people to start looking at using docker as a viable solution
Read More

Puppet & Chocolatey – Install GDrive Stream

Introduction Experimenting with Puppet & Chocolatey on Windows. Little snippet to install Google Drive Stream. class windows::google_drive_stream { Package { provider => 'chocolatey' } package { 'google-drive-file-stream': ensure => installed, } }

Postfix SMTP Sender Routing

Recently, I had need of setting up a postfix “smtp router” to distribute mail from various users among a cluster of outbound relays (on unique exit IP’s, with difference QoS policies applied) Part of the functionality that was desired was the ability to route “priority” users and “bulk” users via different cluster members. Step 1
Read More

Perl Get Active Queue Size (NetXMS/PRTG Use case)

The following Perl script gets the size of the Postfix Active queue and outputs it. (Used for queue monitoring on our NMS via SSH sensors, but might be useful in your environment) #!/usr/bin/env perl use strict; use warnings; use Symbol; sub count { my ($dir) = @_; my $dh = gensym(); my $c = 0;
Read More

Zimbra SASL Errors

If you’re observing errors on your Zimbra servers’ mail-log similar to the one below, and your users are reporting password prompts on ‘sending’ e-mails. Nov 24 17:12:07 areto postfix/smtpd[5528]: warning: SASL authentication failure: cannot connect to saslauthd server: Connection refused Run the following commands under your servers root user. ln -s /var/spool/postfix/var/run/saslauthd /var/run/saslauthd zmcontrol restart
Read More

Proxmox – Remove local LVM

I’m  a big Proxmox fan, having deployed more than 20 systems both at customers and on my home lab this year without drama. However, the Proxmox LVM structure bugs the heck out of me. I prefer to utilize a single LVM Volume due to some weird glitches with LXC images and small root LVM partitions. (Not perfect for production,
Read More