1512 posts tagged with "PaaS"
Platform-as-a-Service tooling, economics, and self-hosted alternatives
IPVS Is Dying in Kubernetes: Your Migration Timeline From the v1.37 Feature Gate to v1.43 Removal
Kubernetes 1.37 introduces the KubeProxyIPVS feature gate, starting a staged removal that disables IPVS by default in v1.40 and deletes it in v1.43. The full timeline, what breaks at each gate, and a detect-switch-validate recipe for moving self-hosted clusters to nftables mode.
Stop Buying a Control-Plane Machine Per Tenant: What Kamaji's Pod-Based Control Planes Actually Save
Running each tenant's Kubernetes control plane as pods instead of dedicated machines cuts the per-tenant control-plane bill from €7.50 a month to under €2 — starting at about six tenants. A worked Hetzner-priced model of Kamaji's consolidation, its limits, and the isolation tradeoff that decides whether the saving is safe to take.
kro Hits CNCF's 'Adopt' Ring: What Declarative CRD Composition Buys a PaaS Control Plane That Wants to Stop Hand-Writing Operators
CNCF's Q1 2026 Technology Radar put kro in the Adopt ring alongside Helm and Backstage. What declarative CRD composition actually buys a Cluster API-based PaaS — the 40-line RGD that replaces a hand-written expansion controller — and the four layer-on-layer costs to price in first.
Your Scheduler Config Has No Staging Environment: Rehearsing Bin-Packing Changes With kube-scheduler-simulator
Scheduler config changes ship straight to production because a dev cluster cannot reproduce real contention. kube-scheduler-simulator mirrors your fleet's actual nodes and pods so you can replay bin-packing changes and read per-plugin placement verdicts before anything moves.
Controllers Are Cheap to Write Now. Running One Still Isn't
Writing a Kubernetes controller now takes an afternoon thanks to kubebuilder — but each one still costs a replicated deployment, a sized informer cache, and idempotent reconcile logic. A promotion table for six tenant-lifecycle jobs: what a self-hosted PaaS should turn into controllers, and what should stay a script.
Kubernetes 1.36 Resizes Pods In Place — Until It Doesn't: The Two Boundaries Your Autoscaler Still Has to Respect
Kubernetes 1.36 enables pod-level in-place resizing by default, but resizes that cross a QoS class are rejected and memory shrinks below live usage are blocked. What each boundary means and the recreate-not-resize fallback your autoscaler needs.
Kubernetes v1.37's Deprecations Are a Ticking Clock: Audit Your Self-Hosted PaaS Before the Upgrade Window Closes
Kubernetes v1.37 puts dated removal timelines on kube-dns, kube-proxy IPVS mode, and cgroup v1. A concrete sunset table plus six runnable audit checks for your Cluster API fleet's controllers, CRDs, webhooks, and node templates — run them between code freeze and GA, not after reconciliation breaks.
Kubernetes 1.37 Deletes Deprecated Kubelet Flags: The Pre-Upgrade Audit That Keeps Your Nodes Joining
Kubernetes 1.37 turns deprecated kubelet flags into fatal unknown-flag errors that stop nodes from joining. The exact failure signature, which flags are in the cleanup wave, and a five-step audit for Cluster API fleets to find every stale flag before upgrade day.
KWOK Before Scale: Load-Test Your Cluster API Controllers Against 200 Fake Nodes Before Your Tenants Do
SNCF proved Cluster API holds at 200 clusters. KWOK lets you prove your own controllers hold as object counts grow — a four-rung ramp from 50 to 400 fake nodes on a laptop, with pass/fail thresholds and the informer-cache checklist the top rung exists to expose.