Prepping VyOS + OpenVPN for use with a Chromebook

First, you need to create the certificates. Use EasyRSA for this. Follow the instructions at the OpenVPN site for that. To build the CA certificate, use the command: ./easyrsa build-ca To build the server certificate, use the command: ./easyrsa build-server-full server To build a client, use the command: ./easyrsa build-client-full client You may want […]

XenCenter Storage Repository Rescan Issue – Solved

When clicking rescan on a storage respository in XenCenter, you may encounter an error like the one below. The problem is usually due to a foreign file in the storage repository. To find out what the offending file is, turn to the power of the command-line. Login to the master server and run the following […]

Tuning Ext4 for MythTV

When using an ext4 filesystem for MythTV, here are a few tricks to help improve speed. First of all, always create a separate partition for your recordings! Here’s how to ensure that it is optimal. Let’s say that you create a partition on device /dev/sdb. mkfs.ext4 -T largefile /dev/sdb1 tune2fs /dev/sdb1 -o journal_data_writeback echo “/sbin/blockdev […]

Xenserver Heterogeneous CPUs in Pool

I have been working to get some Xenservers setup in the same pool that have different CPU versions. With different features, I get the error message that the CPUs are not homogeneous. To help rectify this, I created the following script and then followed the instructions below. /root/get-cpu-features #!/usr/bin/perl $FEATURES2=$ARGV[0]; if (exists $ARGV[1]) { $FEATURES1=$ARGV[1]; […]

Why the public cloud is the fast food of the IT industry.

The challenge for any IT manager is how to meet business requirements with technology.  More often than not, those requirements dictate rapid deployment.  The cloud excels at this, since the infrastructure is already available and waiting to be used.  Rapid deployment, just as fast-food, does not guarantee quality, however.  In fact, the performance and reliability […]

Cloudsourcing – What is this “IT revolution” all about?

First there were servers.  Each server had a single purpose.  In some cases, 90% of the time, they ran idle — a big waste of resources (processor, disk, memory, etc.) Then there were server farms, which were groups of servers distributing loads for single applications.   Distributing loads to multiple servers allowed for higher loads […]