Radosław from aleno migrated from ECS to Kubernetes — spot instances broke at 20+ containers, firewalls silently dropped traffic, and the wrong memory metric caused OOM kills.

You will learn:

- Why ECS spot instances have no built-in fallback mechanism — and how Karpenter's flexible instance selection solves it
- How running Flux and Argo CD together gives infra teams git-push workflows while developers get a UI
- Why the default Kubernetes memory metric includes evictable caches — and switching to working set fixed OOM errors
- How jemalloc cut memory usage by 20% and fixed HPA autoscaling for WebSocket containers

Watch (or listen to) it here: https://ku.bz/x6wFMhVsx

🌟 This episode is sponsored by LearnKube — get started on your Kubernetes journey through comprehensive online, in-person, or remote training https://learnkube.com/training

With @Birthmarkb

🗓 Kubernetes events starting in the next 24 hours:

24 Feb, 16:30 UTC - 18 Bluetooth Controllers Walk into a Bar & Smells Like Clean Telemetry | Cloud Native Linz - 📍 In-person meetup

24 Feb, 17:00 UTC - Automating Your On-Prem Infrastructure with the Operator SDK | Silicon Chalet - 📍 In-person meetup

24 Feb, 17:30 UTC - Two Years of GitOps with FluxCD in Production | Cloud Native Night - 📍 Online & in-person meetup

24 Feb, 17:30 UTC - The 44% Price I Paid for Observability | Cloud Native Barcelona - 📍 In-person meetup

24 Feb, 18:00 UTC - Kubernetes security for production-grade solutions | DevOps Notts - 📍 In-person meetup

24 Feb, 18:00 UTC - How to manage 100 containers in production without Kubernetes | Reggio Emilia Full Stack - 📍 In-person meetup

24 Feb, 22:30 UTC - Secrets Security End-To-End & Effortless Containerization with Buildpacks | Cloud Native Montréal - 📍 In-person meetup

25 Feb, 01:30 UTC - Reasoning at Scale: Knowledge Graphs, Hybrid Search, MCTS, and Kubernetes | San Diego Software Engineers - 📍 In-person meetup

25 Feb, 09:30 UTC - Authentication and Authorization | Cloud Native Security Japan - 📍 Online & in-person meetup

24 Feb, 15:30 UTC - We Broke Free From Cloud-Managed Kubernetes: Now What? | Cloud Native Copenhagen - 📍 In-person meetup

→ See all Kubernetes events

This week on Learn Kubernetes Weekly 172:

🔥 Google Cloud Shell Container Escape
🌐 Azure Kubernetes Service Deep Dive Into Azure CNI Pod Subnet
💭 How I Think About Kubernetes
📦 How We Shrunk a Kubernetes Sidecar from 421MB to 90MB (With No OS Inside)
🎯 Kube Resource Orchestrator: Manage any group of resources as one unit

Read it now: https://kube.today/issues/172

⭐️ This newsletter is brought to you by Kubex — Automated Resource Optimization for Kubernetes, GPUs and AI Workloads https://ku.bz/y98T8bWXP

🗓 Kubernetes events starting in the next 24 hours:

25 Feb, 15:30 UTC - Talos KMS: Getting the Russian Doll out of your cluster | Cloud Native Aarhus - 📍 In-person meetup

25 Feb, 16:30 UTC - Kubernetes Beyond Orchestration | HariKube - 📍 Online webinar

25 Feb, 16:30 UTC - Hands-on workshop supply chain security | Cloud Native Göteborg - 📍 In-person meetup

25 Feb, 17:00 UTC - Crossplane 2.0 - AI-Driven Control Loops for Platform Engineering | CNCF Online Programs - 📍 Online meetup

25 Feb, 18:00 UTC - Modernize & Scale: Why and how to migrate your workloads to GKE | Google - 📍 Online webinar

25 Feb, 18:30 UTC - What’s Up, OTel? | OpenTelemetry Live - 📍 Online meetup

25 Feb, 23:00 UTC - Fixing Kubernetes Validation & Security | Cloud Native Panama - 📍 Online meetup

25 Feb, 23:00 UTC - Observability in Kubernetes & Building Abstractions That Matter: A Developer Platform on Kubernetes | Boston Kubernetes Meetup - 📍 In-person meetup

25 Feb, 23:00 UTC - Securing Debugging Workflows in Cloud-Native Environments | Cloud Native New York City - 📍 Online meetup

26 Feb, 01:00 UTC - GitOps in 30 minutes: from zero to real flow with Flux | Cloud Native San Salvador - 📍 Online meetup

26 Feb, 12:30 UTC - Implementing KEDA with SQS & Manage Kubernetes With Independent Robot Housekeeping Using Job | Kubernetes Indonesia - 📍 Online meetup

→ See all Kubernetes events

Starting in about a week:

🔥 SCALE 23x (SCALE)
📍 In-person conference

📅 5 Mar
⏰ 05/03/2026, 12:00 UTC

→ Visit the website

Starting in two weeks:

🔥 Advanced Kubernetes course (LearnKube)
📍 Online workshop

📅 12 Mar
⏰ 12/03/2026, 13:00 UTC

→ Visit the website

🗓 Kubernetes events starting in the next 24 hours:

26 Feb, 16:00 UTC - The Neverending Story – Tales from the Homelab | Cloud Native Graz - 📍 In-person meetup

26 Feb, 17:00 UTC - Secure all the things: From IaC to Kubernetes | Silicon Chalet - 📍 In-person meetup

26 Feb, 17:00 UTC - Exploring TruLens | CNCF Online Programs - 📍 Online webinar

26 Feb, 17:00 UTC - Building a Kubernetes Distribution From Scratch: Lessons From an Official Distribution Journey | Cloud Native Munich - 📍 In-person meetup

26 Feb, 17:30 UTC - Docker Sandboxes as a New Layer of Isolation & Docker Compose Meets AI | Cloud Native Trento - 📍 In-person meetup

26 Feb, 18:00 UTC - Introducing KRO: Simple Custom APIs for Kubernetes | Cloud Native Tunis - 📍 Online meetup

26 Feb, 18:00 UTC - The Validation Valley: Big Unsolved Roadblocks of Modern Development | Cloud Native Sevilla - 📍 Online & in-person meetup

26 Feb, 23:00 UTC - From Monitoring to Observability: Understanding the Real Behavior of Systems | Cloud Native Santo Domingo - 📍 Online meetup

→ See all Kubernetes events

Starting in 2 months:

🔥 foss-north 2026 (Free Open Source Software North Conferences)
📍 In-person conference

📅 28 Apr
⏰ 28/04/2026, 07:00 UTC

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📅 28 Apr
⏰ 28/04/2026, 09:00 UTC

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🗓 Kubernetes events starting in the next 24 hours:

28 Feb, 03:30 UTC - Taming Multi-Cluster Kubernetes Access: A Teleport Journey | Cloud Native Chennai - 📍 In-person meetup

28 Feb, 03:30 UTC - Automating CI/CD Using Kargo | Cloud Native Kochi - 📍 In-person meetup

28 Feb, 12:00 UTC - 🔥 DevOps fwdays'26 | fwdays - 📍 Online & in-person conference

28 Feb, 08:00 UTC - 🔥 KubeFest 2026 | Cloud Native Rioja - 📍 In-person conference

28 Feb, 14:00 UTC - 🔥 Kubernetes Community Days Guadalajara 2026 | KCD Guadalajara - 📍 In-person conference

→ See all Kubernetes events

Starting in about a week:

🔥 Devopsdays Los Angeles (Devopsdays)
📍 In-person conference

📅 6 Mar
⏰ 06/03/2026, 16:00 UTC

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🔥 KubeFest 2026 (Cloud Native Rioja)
📍 In-person conference

📅 28 Feb
⏰ 28/02/2026, 08:00 UTC

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Starting in less than 24 hours:

🔥 DevOps fwdays'26 (fwdays)
📍 Online & in-person conference

📅 28 Feb
⏰ 28/02/2026, 12:00 UTC

→ Visit the website

Starting in less than 24 hours:

🔥 Kubernetes Community Days Guadalajara 2026 (KCD Guadalajara)
📍 In-person conference

📅 28 Feb
⏰ 28/02/2026, 14:00 UTC

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Starting in 2 months:

🔥 Devopsdays Raleigh (Devopsdays)
📍 In-person conference

📅 30 Apr
⏰ 30/04/2026, 12:00 UTC

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Starting in two weeks:

🔥 Advanced Kubernetes course (Munich) (LearnKube)
📍 In-person workshop

📅 16 Mar
⏰ 16/03/2026, 08:00 UTC

→ Visit the website

📕 We published a book on optimising and right-sizing GPUs in Kubernetes.

Most GPU clusters show 100% allocation and single-digit actual usage.

The book helps you:

- Tell whether your GPUs are actually computing or just allocated
- Pick the right metrics instead of trusting nvidia-smi
- Choose between time-slicing, MIG, and dedicated GPUs based on real data
- Stop GPU waste from cascading into CPU and memory waste

Download it for free here: ku.bz/KL4jRvsL4

This book was made possible by Kubex.

🗓 Kubernetes events starting in the next 24 hours:

3 Mar, 01:00 UTC - CKA Exam Study Session & Practice | Cloud Native Cali - 📍 Online meetup

3 Mar, 11:00 UTC - Beyond the Green Heart: Optimizing Your Kubernetes Deployments with ArgoCD | France DevOps Paris - 📍 Online meetup

→ See all Kubernetes events

Karpenter can rotate your nodes for three reasons: they're underutilized, they're empty, or the AMI has drifted from what you specified.

You can set a disruption budget for each reason to control how many nodes rotate at once. But here's the catch: if you only set budgets for two reasons and skip the third, Karpenter doesn't disable it. It silently applies a default 10% budget to any reason you didn't mention.

Adhi Sutandi's team found this the hard way — drift events fired during maintenance windows they thought were locked down. The fix? Set a single budget of one node with no reason qualifier, so it applies to everything.



New episode out now: https://ku.bz/XyVfsSQPr

🗓 Kubernetes events starting in the next 24 hours:

4 Mar, 00:00 UTC - Kubernetes 101 | Cloud Native Quito - 📍 Online meetup

4 Mar, 06:30 UTC - Managing Kubernetes at scale with ClusterAPI, GitOps, and NKP | KSUG.AI Australia - 📍 Online & in-person meetup

→ See all Kubernetes events

This week on Learn Kubernetes Weekly 173:

🔥 Kubernetes Egress Control with Squid Proxy
💪 How We Turned a Forced OS Migration into a 30% Infrastructure Reduction
⚡ Auto-scaling and Load-based Scaling in Kubernetes
🎯 Smart Scheduler: Intelligent Pod Placement for Kubernetes Cost Optimization
🤖 Using Claude Code to Pilot Kubernetes on Autodock

Read it now: https://kube.today/issues/173

⭐️ This newsletter is brought to you by Hadron, the new lightweight secure Linux OS from the Kairos team https://ku.bz/mMZytrj-z