6 minute read

As announced in the previous post, I rebooted the blog in order to write about our experiences with OpenStack and Ceph. For the first topic I picked the Ceph cache tiering, as we have recently struggled quite a bit to keep it up and running ;)

We have a lot of short living VMs which are used for automated tests. Those tests are quite IO heavy so we decided to put an NVMe flash based cache tier in front of our regular Ceph pool used for VMs. I’ll post a more detailed overview about our Ceph and OpenStack deployment (and how we arrived there) in future posts, so for now we’ll directly dive into the oddities of Ceph caches.

1 minute read

It’s been a long time, but I figured it’s time to restart the blog. In the past two years we started setting up an OpenStack based IaaS for our developers to be able to test our software in a distributed fashion. As storage we’ve chosen Ceph which is quite powerful but also comes with a few unexecpted quirks. So expect quite some OpenStack and Ceph posts in the future.

3 minute read

A few weeks ago I had to prepare our [Jenkins][1] for an internal cloud update. The update would take place over the weekend, so it had to be down on Saturday, 8 a.m. I didn’t want to wait until everyone was finished on Friday evening, so I had a look for an automatic shutdown procedure.

1 minute read

Hello everybody, I thought a good article to start with would be the developers evergreen, Hello World ;) This one is from Java, as you might already have recognized. public class Main { public static void main(String[] args) { System.out.println("Hello World!"); } } So to explain a little further, what this blog is about: I intend to post stuff about little projects I work on. So what stuff will that be?