clustered cron jobs

We’ve been recently running rest APIs on active-active server pairs (docker containers running on pairs of VMs on separate hosts) with postgres-BDR (multi-master bidirectional replication) for […]

Replacing VMWare with KVM

I’ve been using an i5 Intel NUC at home as a home server. I initially installed ESX on the NUC […]

Unable to start VMs on ESX5i

We came across a weird problem on ESX5i. Occasionally, one of our hosts would suddenly be unable to start any […]

Simple form validation in Wicket

I used to add custom FormValidators to forms where multi-field validation was required (like checking if two copies of an […]