Linux
Kubernetes, blockDevices & denied permissions Paid Members Public
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.
Enable SR-IOV on Broadcom NICs and configure VF count Paid Members Public
Running broadcom network cards using SR-IOV might require configuration of the cards firmware. This also applies for example if you want to adjust the total number of virtual functions.
Get filesystem access using an ephemeral container in kubernetes Paid Members Public
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 Paid Members Public
Running kubectl on pipelines with interactive authentication is somewhat non-optimal :-) Let's make it better without using long-living tokens.
When fstrim stalls your I/O subsystem Paid Members Public
On one of our systems we had issues that - once a week - the I/O subsystem stalled and causes issues on database operations.
postgres - database has no actual collation version, but a version was recorded Paid Members Public
Upgrading a major postgres version using containers with different C libraries caused me some headaches because I go an error "database has no actual collation version, but a version was recorded" - and I did not fix it. At least I can give a hint on why it happend and how you could avoid it.
postgres - upgrading postgres with timescaledb running in a container Paid Members Public
Uprading postgres with timescaledb caused me some issues related to the collation. After some retries I've found a reliable way to doing the upgrade. This post describes the steps to be done.
Why you should use rook ceph on kubernetes (onprem) Paid Members Public
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.
