Drew Rogers

Automating Let’s Encrypt Certificate Renewal using DNS Challenge Type

Let’s Encrypt makes the automation of renewing certificates easy using certbot and the HTTP-01 challenge type. However when using the HTTP challenge type, you are restricted to port 80 on the target running certbot. This can be cumbersome if you have multiple certificates, and personally I don’t like having port 80 open inside my network. … Read More

Convert Citrix Xenserver XVA Image to KVM

qemu-img is a tool apart of the qemu-utils package that lets you convert a wide variety of disk images from one hypervisor to another. However Citrix Xenserver image format XVA is not an option for qemu-img, so lets add it! Here’s how to convert an XVA image to KVM Extract the XVA image. A XVA … Read More

Sensu: Finally the Nagios Replacement I Have Been Looking For!

Nagios, the popular open source system and networking monitoring service, is awesome. It gives you so much flexibility that expensive commercial software like Solarwinds and Spiceworks just doesn’t have. However after I moved my infrastructure to Chef, Nagios was constantly giving me issues. The configuration scheme just doesn’t fit well in an autonomous environment. In this blog article I review how I found a replacement for Nagios,