Category Archives: Linux

Translating SNMP OIDs Using MIB Files

Posted on June 11, 2013 by Barry O'Donovan

I get caught trying to remember this a lot and there’s a really useful tutorial on this at the Net-SNMP website: Using and loading MIBS. If you’re using Ubuntu, also consider checking the comments in /etc/snmp/snmp.conf which (in 13.04) contains: As … Continue reading →

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Nagios / Icinga Alerts via Pushover

Posted on May 31, 2013 by Barry O'Donovan

I came across Pushover recently which makes it easy to send real-time notifications to your Android and iOS devices. And easy it is. It also allows you to set up applications with logos so that you can have multiple Nagios installations shunting … Continue reading →

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Recovering MySQL Master-Master Replication

Posted on March 23, 2013 by Barry O'Donovan

MySQL Master-Master replication is a common practice and is implemented by having the auto-increment on primary keys increase by n where n is the number of master servers. For example (in my.conf): auto-increment-increment = 2 auto-increment-offset = 1 This article is not about … Continue reading →

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Irish Radio Stations on Linux (2013)

Posted on February 12, 2013 by Barry O'Donovan

This is updating an older article from October 2010. While Linux has come a long way since then for playing back various types of media (and new services such as tunein make it easier again), I still like to just … Continue reading →

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MySQL 5.6 – Memcached / NoSQL Support and More

Posted on February 6, 2013 by Barry O'Donovan

MySQL 5.6 has been released with some interesting new features and performance increases: What’s New in MySQL 5.6 DBA and Developer Guide to MySQL 5.6 InnoDB Integration with memcached:MySQL 5.6 includes a NoSQL interface, using an integrated memcached daemon that … Continue reading →

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For OpenVPN Fans – Optimising for GE Networks

Posted on January 22, 2013 by Barry O'Donovan

I came across this article today which discusses OpenVPN optimisations for Gigebit Ethernet networks. http://community.openvpn.net/openvpn/wiki/Gigabit_Networks_Linux It also shows the phenomenal improvement that can be made thanks to the AES-NI instruction set on newer Intel and AMD chips.

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Apple OS X as an NFS Server (with Linux Clients)

Posted on December 12, 2012 by Barry O'Donovan

For a customer, I had to set up a Linux-based virtualised environment on a MacBook Pro using VirtualBox. This environment included making a couple of 8TB external hard drives available under NFS to the Linux hosts. In all fairness, what … Continue reading →

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