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Change statefulset spec without downtime

Change statefulset spec without downtime

Altering statefulsets on kubernetes can be tricky - as statefulsets are very common used for persistent applications like databases recreation is no option. This guide shows a path around some of these limitations.

Daniel Nachtrub
Daniel Nachtrub
Cloud
Linux kernel keyrings, container isolation and maybe some kerberos

Linux kernel keyrings, container isolation and maybe some kerberos

On a recent project I've been stumbling on the case that kerberos tickets have been inadvertently shared across containers on a node - which obviously caught my attention as I'm not keen on sharing such secrets across workloads. This post describes why this happens and what to do to prevent this.

Daniel Nachtrub
Daniel Nachtrub
Kubernetes
Kubernetes 1.26 on Ubuntu 22.04 LTS

Kubernetes 1.26 on Ubuntu 22.04 LTS

Ubuntu is a very suitable distribution to run kubernetes because we have an up to date kernel with up to date features and packages are available widely. Running kubernetes on Ubuntu is straight forward - except it requires packages that are newer than the upstream provides. This is the case

Daniel Nachtrub
Daniel Nachtrub
openvpn 2.6.0 released

openvpn 2.6.0 released

The new openvpn 2.6.0 has some very nice and shiny features you might want to starting using soon. This post highlights some of them.

Daniel Nachtrub
Daniel Nachtrub
Linux
Create a TPM backed certificate request (on windows)

Create a TPM backed certificate request (on windows)

Certificates are everywhere - sometimes you want to keep them even more secure than just on the filesystem (or operating system store). This guide shows how to create TPM backed certificates on windows.

Daniel Nachtrub
Daniel Nachtrub
Windows
Windows 11 22H2 - stuck RDP session establishment when using UDP transport

Windows 11 22H2 - stuck RDP session establishment when using UDP transport

Windows 11 22H2 currently has an issue when connecting using the Remote Desktop gateway or Remote Desktop Connection Broker. This article gives some information and possible workarounds.

Daniel Nachtrub
Daniel Nachtrub
Windows
"Identity not found" when using Azure pod-managed identities

"Identity not found" when using Azure pod-managed identities

One type of incident that arised on several customer environments within the last weeks has been the result of an issue with Azure pod-managed identities. What is managed podidentity? The idea behind podidentity is that you can assign an identity (mostly a managed service identity [MSI]) to a pod running

Daniel Nachtrub
Daniel Nachtrub
What happens if you ask kubernetes for 1254051 replicas

What happens if you ask kubernetes for 1254051 replicas

One of our playgrounds recently had an incident which caused control-plane to go out-of-memory. This article shows how to diagnose and especially how to fix or event prevent this.

Daniel Nachtrub
Daniel Nachtrub
Kubernetes