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Kubernetes

Multus - pod stuck in terminating state

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.

Daniel Nachtrub
Daniel Nachtrub
Kubernetes
Get filesystem access using an ephemeral container in kubernetes

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!

Daniel Nachtrub
Daniel Nachtrub
Cloud
Using AKS kubectl (kubelogin) on headless systems or pipelines

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.

Daniel Nachtrub
Daniel Nachtrub
Azure
Choosing a postgres operator

Choosing a postgres operator

This post describes my journey on the selection of the postgres operator that matches our demand.

Daniel Nachtrub
Daniel Nachtrub
Kubernetes
Why you should use rook ceph on kubernetes (onprem)

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.

Daniel Nachtrub
Daniel Nachtrub
Cloud
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
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