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Daniel Nachtrub

Daniel Nachtrub

Kind of likes computers. Linux foundation certified: LFCS / CKA / CKAD / CKS. Microsoft certified: Cybersecurity Architect Expert & Azure Solutions Architect Expert.

ingress-nginx 1.12 & allow-snippet-annotations

ingress-nginx 1.12 & allow-snippet-annotations

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

multus - deadlock state on thick plugin

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

kubernetes, cgroups v2 and failing health probes

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
Can't delete kubernetes namespace (NamespaceDeletionDiscoveryFailure)

Can't delete kubernetes namespace (NamespaceDeletionDiscoveryFailure)

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
mysql - online index creation

mysql - online index creation

This post shows how easy it is to alter tables (in this example index creation) online to keep your sql database uninterrupted and clients online.

Daniel Nachtrub
Daniel Nachtrub
Database
Ansible - pretty print output

Ansible - pretty print output

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
Object attribute defaults on terraform - hello simplicity

Object attribute defaults on terraform - hello simplicity

Using terraform's object attributes defaults empowers you to create complex input values that still apply default values on a highly granular level. This post shows an example how to use this.

Daniel Nachtrub
Daniel Nachtrub
IaC
Configurable default values on terraform objects

Configurable default values on terraform objects

Creating complex configurations requires many dimensions on the input - this post shows how to take care of default values in such a case to offer users of your code fine grained control without enforcing too much input if not required.

Daniel Nachtrub
Daniel Nachtrub
Terraform