Kubernetes
Unexpected behavior of TUN devices in Kubernetes >= 1.31.3
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.
Kubernetes, blockDevices & denied permissions
Mounting (block)devices on containers might result in permission errors (Permission denied) if pods have applied a securityContext. It's possible to configure this on containerd and get both of best worlds - fast device access and reduced permissions on containers.
Multus - pod stuck in terminating state
Having multus in place, pods might be stuck in starting or terminating state if you made a mistake in the config.
Get filesystem access using an ephemeral container in kubernetes
Sometimes you need to access a containers filesystem but the container itself is eventually distroless or does not offer any shell. Here's how to access the filesystem anyway using ephemeral containers!
Using AKS kubectl (kubelogin) on headless systems or pipelines
Running kubectl on pipelines with interactive authentication is somewhat non-optimal :-) Let's make it better without using long-living tokens.
Choosing a postgres operator
This post describes my journey on the selection of the postgres operator that matches our demand.
Why you should use rook ceph on kubernetes (onprem)
If you run kubernetes on your own, you need to provide a storage solution with it. We are using ceph (operated through rook). This article gives some short overview about it's benefits and some pro's and con's of it.
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.
