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M590E hardware mods

November 21, 2018November 17, 2019 G1FEF Hardware

The M590E is a 2G GSM module that, at the time of writing, can be bought as a kit on eBay for around £1 complete with PCB and components.

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Turning POE on and off on the Cisco 3750 via SNMP

September 8, 2018September 8, 2018 G1FEF Programming

I recently had a requirement to be able to turn the POE power off / on on specific ports on a remote c3750 POE switch in order to reboot devices that kept crashing.

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Asterisk systemd startup script

September 8, 2018September 8, 2018 G1FEF System admin

The systemd startup script “out of the box” (at least up to version 15.5) for Asterisk does not work properly: on rebooting the server the ownership of /run/asterisk (symlink /var/run/asterisk) reverts to root.root instead of asterisk.asterisk The reason for this is that the o/s removes and re-creates the /run/asterisk directory on reboot. The solution is […]

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Setup MySQL / MariaDB master slave replication

July 2, 2017August 13, 2019 G1FEF Database, System admin

mysql -u root -p < dump.sql How to setup a single master with one or more readonly slaves

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Setting up and using your own SSL CA

May 31, 2017July 2, 2017 G1FEF System admin

This guide shows how to setup a Certificate Authority on Centos 7

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Centos 7 + Postfix + Amavisd-new + Clamav + OpenDKIM + OpenDMARC

May 28, 2017July 2, 2017 G1FEF System admin

How to setup Postfix, Amavisd-new, Clamav, OpenDKIM & OpenDMARC on Centos 7

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Setting up a Galera MariaDB Cluster

May 27, 2017July 2, 2017 G1FEF Database, System admin

How to setup a Galera MariaDB Cluster

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Update MediWiki

May 11, 2017July 2, 2017 G1FEF System admin

How to update MediaWiki

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Interacting with certbot non-interactively

May 9, 2017July 2, 2017 G1FEF System admin

Command line parameters for the LetsEncrypt certbot script

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Update Cacti

April 16, 2017July 2, 2017 G1FEF System admin

How to upgrade Cacti to the latest version

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  • M590E hardware mods
  • Turning POE on and off on the Cisco 3750 via SNMP
  • Asterisk systemd startup script
  • Setup MySQL / MariaDB master slave replication
  • Setting up and using your own SSL CA

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