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KubeFM

Discover all the great things happening in the world of Kubernetes, learn (controversial) opinions from the experts and explore the successes (and failures) of running Kubernetes at scale.

  1. −9 H

    Migrating to Karpenter: Fun Stories, with Adhi Sutandi

    Running multiple Kubernetes clusters on AWS with the cluster autoscaler? Every four months, you face the same grind: upgrading Kubernetes versions, recreating auto scaling groups, and hoping instance type changes stick. Adhi Sutandi, DevOps Engineer at Beekeeper by LumApps, shares how his team migrated from the cluster autoscaler to Karpenter across eight EKS clusters — and the hard lessons they learned along the way. In this episode: Why AWS auto scaling groups are immutable and how that creates upgrade bottlenecks at scale How the latest AMI tag accidentally turned less critical clusters into chaos engineering environments, dropping SLOs before anyone realized Karpenter was the cause Why pre-stop sleep hooks solved pod restartability problems that Quarkus's built-in graceful shutdown couldn't The case for pod disruption budgets over Karpenter annotations when protecting critical workloads during node rotations How Karpenter's implicit 10% disruption budget caught the team off guard — and the explicit configuration that fixed it Sponsor This episode is sponsored by LearnKube — get started on your Kubernetes journey through comprehensive online, in-person or remote training. More info Find all the links and info for this episode here: https://ku.bz/XyVfsSQPr Interested in sponsoring an episode? Learn more.

    1 tim 2 min

  2. 24 FEB.

    From ECS to Kubernetes: A Real Migration Story, with Radosław Miernik

    Migrating from ECS to Kubernetes sounds straightforward — until you hit spot capacity failures, firewall rules silently dropping traffic, and memory metrics that lie to your autoscaler. Radosław Miernik, Head of Engineering at aleno, walks through a real production migration: what broke, what they missed, and the fixes that made it work. In this interview: Running Flux and Argo CD together — Flux for the infra team, Argo CD's UI for developers who don't want to touch YAML How the wrong memory metric caused OOM errors, and why switching to jemalloc cut memory usage by 20% Splitting WebSocket and API containers into separate deployments with independent autoscaling Four months of migration, over 100 configuration changes in the first month, and a concrete breakdown of what platform work looks like when you can't afford downtime. Sponsor This episode is sponsored by LearnKube — get started on your Kubernetes journey through comprehensive online, in-person or remote training. More info Find all the links and info for this episode here: https://ku.bz/x6wFMhVsx Interested in sponsoring an episode? Learn more.

    38 min

  3. 17 FEB.

    Faster EKS Node and Pod Startup, with Jan Ludvik

    Kubernetes nodes on EKS can take over a minute to become ready, and pods often wait even longer — but most teams never look into why. Jan Ludvik, Senior Staff Reliability Engineer at Outreach, shares how he cut node startup from 65 to 45 seconds and reduced P90 pod startup by 30 seconds across ~1,000 nodes — by tackling overlooked defaults and EBS bottlenecks. In this episode: Why Kubelet's serial image pull default quietly blocks pod startup, and how parallel pulls fix it How EBS lazy loading can silently negate image caching in AMIs — and the critical path workaround A Lambda-based automation that temporarily boosts EBS throughput during startup, then reverts to save cost The kubelet metrics and logs that expose pod and node startup latenc,y most teams never monitor Every second saved translates to faster scaling, lower AWS bills, and better end-user experience. Sponsor This episode is sponsored by LearnKube — get started on your Kubernetes journey through comprehensive online, in-person or remote training. More info Find all the links and info for this episode here: https://ku.bz/B7TzKXyxf Interested in sponsoring an episode? Learn more.

    22 min

  4. 10 FEB.

    Kubernetes is not just for Black Friday, with Thibault Martin

    You self-host services at home, but upgrades break things, rollbacks require SSH-ing in to kill containers manually, and there's no safety net if your hardware fails. Thibault Martin, Director of Program Development at the Matrix Foundation, walked this exact path — from Docker Compose to Podman with Ansible to Kubernetes on a single server — and explains why each transition happened and what it solved. In this interview: Why Ansible's declarative promise fell short with the Podman collection, forcing sequential imperative steps instead of desired-state definitions How community Helm charts replace the need to write and maintain every manifest yourself Why GitOps isn't just a deployment workflow — it's a disaster recovery strategy when your infrastructure lives in your living room How k3s removes the barrier to entry by bundling opinionated defaults so you can skip choosing CNI plugins and storage providers Kubernetes doesn't have to be enterprise-scale — with the right distribution and community tooling, it can be a practical, low-overhead choice for anyone who cares about their data. Sponsor This episode is sponsored by LearnKube — get started on your Kubernetes journey through comprehensive online, in-person or remote training. More info Find all the links and info for this episode here: https://ku.bz/Xk5S7VqXz Interested in sponsoring an episode? Learn more.

    28 min

  5. 3 FEB.

    Patroni Backups: when pgBackRest and Argo CD have your back (literally), with Ziv Yatzik

    Your database backup strategy shouldn't be the thing that takes your production systems down. Ziv Yatzik manages 600+ Postgres clusters in a closed network environment with no public cloud. After existing backup solutions proved unreliable — causing downtime when disks filled up — his team built a new architecture using pgBackRest, Argo CD, and Kubernetes CronJobs. In this episode: Why storing WAL files on shared NAS storage prevents backup failures from cascading into database outages How GitOps with Argo CD lets them manage backups for hundreds of clusters by adding a single YAML file The Ansible + Kubernetes hybrid approach that keeps VM-based Patroni clusters in sync with Kubernetes-orchestrated backups A practical blueprint for making database backups boring, reliable, and safe. Sponsor This episode is sponsored by LearnKube — get started on your Kubernetes journey through comprehensive online, in-person or remote training. More info Find all the links and info for this episode here: https://ku.bz/Rg_sQYSmw Interested in sponsoring an episode? Learn more.

    25 min

  6. 27 JAN.

    Running a Full Kubernetes Cluster for $2 a Month, with Varnit Goyal

    Most developers assume Kubernetes requires an enterprise budget. Varnit Goyal proves otherwise — he built a full three-node Kubernetes cluster for $2.16/month using Rackspace Spot Instances. The trick: pick non-default instance types, distribute nodes across low-demand regions, and let Kubernetes handle rescheduling when nodes get preempted. For service exposure, he replaced the $10/month load balancer with Tailscale Funnel — free. In this episode: How Spot Instance bidding works and which strategies keep costs and preemption low Using Tailscale Kubernetes operator as a free alternative to traditional load balancers Running real development dependencies (Kafka, Elasticsearch, Postgres) on a budget cluster A practical walkthrough of what Kubernetes actually needs to function — and what you can strip away. Sponsor This episode is sponsored by LearnKube — get started on your Kubernetes journey through comprehensive online, in-person or remote training. More info Find all the links and info for this episode here: https://ku.bz/HpVyQMVv0 Interested in sponsoring an episode? Learn more.

    27 min

  7. 13 JAN.

    We Broke Our EKS Cluster Autoscaler with the AL2023 Migration, with Dilshan Wijesooriya

    Dilshan Wijesooriya, Senior Cloud Engineer, discusses a real incident where migrating EKS nodes to AL2023 caused the cluster autoscaler to lose AWS permissions silently. You will learn: Why AL2023 blocks pod access to instance metadata by default, breaking components that relied on node IAM roles (like cluster autoscaler, external-DNS, and AWS Load Balancer Controller) How to implement IRSA correctly by configuring IAM roles, Kubernetes service accounts, and OIDC trust relationships, and why both AWS IAM and Kubernetes RBAC must be configured independently The recommended migration strategy: move critical system components to IRSA before changing AMIs, test aggressively in non-production, and decouple identity changes from OS upgrades How to audit which pods currently rely on node roles and clean up legacy IAM permissions to reduce attack surface after migration Sponsor This episode is sponsored by LearnKube — get started on your Kubernetes journey through comprehensive online, in-person or remote training. More info Find all the links and info for this episode here: https://ku.bz/T_YPfTfDb Interested in sponsoring an episode? Learn more.

  8. 2025-12-02

    A Journey Through Kafkian SplitDNS in a Multitenant Kubernetes, with Fabián Sellés Rosa

    Fabián Sellés Rosa, Tech Lead of the Runtime team at Adevinta, walks through a real engineering investigation that started with a simple request: allowing tenants to use third-party Kafka services. What seemed straightforward turned into a complex DNS resolution problem that required testing seven different approaches before a working solution was found. You will learn: Why Kafka's multi-step DNS resolution creates unique challenges in multi-tenant environments, where bootstrap servers and dynamic broker lists complicate standard DNS approaches The iterative debugging process from Route 53 split DNS through Kubernetes native pod DNS config, custom DNS servers, Kafka proxies, and CoreDNS solutions How to implement the final solution using node-local DNS and CoreDNS templating with practical details including ndots configuration and Kyverno automation Platform engineering evaluation criteria for assessing solutions based on maintainability, self-service capability, and evolvability in multi-tenant environments Sponsor This episode is sponsored by LearnKube — get started on your Kubernetes journey through comprehensive online, in-person or remote training. More info Find all the links and info for this episode here: https://ku.bz/NsBZ-FwcJ Interested in sponsoring an episode? Learn more.

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Discover all the great things happening in the world of Kubernetes, learn (controversial) opinions from the experts and explore the successes (and failures) of running Kubernetes at scale.

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  • Skapad av
    KubeFM
  • Aktiva år
    2023 - 2026
  • Avsnitt
    90
  • Åldersgräns
    Barnvänligt
  • Copyright
    © 2023-2026 KubeFM
  • Programmets webbplats
    KubeFM

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