Processes and signals, namespaces and cgroups, memory, storage, networking, and identity: the mechanism behind each, the two or three ways it breaks under a pod, and the one check that confirms it. Written from on-call across 100+ production Kubernetes clusters.
Lessons from writing CiliumNetworkPolicies for the KubeAid-addons chart - toServices port traps, labels Cilium ignores, toFQDNs without a DNS rule, default-deny surprises, and why every namespace needs exactly one default-deny.
Deployment mode, object storage, label cardinality, multi-tenancy and auth, cross-cluster shipping, and the failures that are silent rather than loud. Written after moving a Loki install twice and debugging an object store that corrupted everything it was given.
A breakdown of how kube-apiserver audit events actually work - request stages, audit levels, writing policies, and how SREs tune them differently for prod vs dev clusters.
Two Grafana dashboards, same node, same timestamp - one shows 62 GB used, other shows 10 GB. Both are correct. Here's the full story of how Linux memory actually works and which number you should actually be watching.