Setting up ZFS on Debian in 10 minutes

We run a small Citrix XenServer cluster at work, for our internal servers, and we had been running just a simple raid-1 array on the backend server. However the idea of SSD cache peaked my interest, so I backed up our storage repo one weekend, and reinstalled the server. Here’s how I installed it: apt-get […]

MySQL Multi-Master Replication Setup

So we have a bunch of websites for different markets, running wordpress, which we would ideally like hosted in their home market. BUT, we want to be able to fail them over to a different country, should the servers in their country go down. Failover in a MySQL master-slave relationship is always a bit of […]

Enabling SNMP on Xenserver 6

I spent an hour this afternoon cleaning up our OpManager install, making sure the new servers in the NZ office are monitored correctly. And then I realised that we don’t have SNMP enabled on the XenServer hosts over there. Turns out it’s not too hard though: Edit /etc/sysconfig/iptables Add in amongst the other allows: -A […]