Linux

Cannot access more than a few virtual functions using SRIOV Members Public

SRIOV is a powerful technology with it's own challenges. Sometimes simple things are the solutions. Still you can always learn a little more about how it works behind the curtain!

Daniel Nachtrub
Daniel Nachtrub
Linux

ingress-nginx 1.12 & allow-snippet-annotations Members Public

If you need to use snippet annotations (why?) on ingress-nginx - you'll also need to adjust the annotation filtering.

Daniel Nachtrub
Daniel Nachtrub
Azure

multus - deadlock state on thick plugin Members Public

Using Multus CNI's 'thick plugin' in Kubernetes can cause pod startup deadlocks due to circular dependencies between pods and the Multus daemon. Switching to the daemonless 'thin plugin' mode effectively resolves this initialization issue.

Daniel Nachtrub
Daniel Nachtrub
Cloud

kubernetes, cgroups v2 and failing health probes Members Public

Running Kubernetes on a systemd-based OS can lead to pods restarting endlessly due to health probe failures, caused by the systemd cgroup driver. Previously, this was fixed by modifying boot options, but a simpler approach is to switch the kubelet to use cgroupfs instead.

Daniel Nachtrub
Daniel Nachtrub
Cloud

Helm's Hidden Quirks: Merging boolean values Members Public

Helm is a powerful tool for manageing Kubernetes applications. Despite its ubiquity in the kubernetes-world, there are some nuances to consider when working with boolean values—especially when merging complex objects.

Felix Zimmermann
Kubernetes

Can't delete kubernetes namespace (NamespaceDeletionDiscoveryFailure) Members Public

While trying to delete a namespace on a kubernetes cluster I learned that there is a resource type apiservice :-) This post shows how to unblock deletions due orphaned apiservice definitions.

Daniel Nachtrub
Daniel Nachtrub
Linux

Unexpected behavior of TUN devices in Kubernetes >= 1.31.3 Members Public

Sometimes, security improvements in one project can cause problems in places nobody ever expected. In this case, we had to deal with one of these improvements.

Felix Zimmermann
Kubernetes

Ansible - pretty print output Members Public

Sometimes you want to print more or extensive information on ansible output (in this case a terraform plan). This can easily be realised using an stdout callback.

Daniel Nachtrub
Daniel Nachtrub
IaC