Rolling Updates Still Cause Outages – Narration You think rolling updates are safe.
They’re not.
Even with zero downtime deployment, your service crashes.
Here’s why.
During a rolling update, old and new versions run together.
They share the same database.
The new code expects columns that don’t exist yet.
Requests fail.
Your dashboard goes red.
Connection pools exhaust.
Load balancers route traffic to unhealthy pods.
Health checks pass, but your service is broken.
Silent failures happen in the gaps between versions.
The fix isn’t complicated.
Database migrations must run before deployment.
Health checks need real business logic tests.
Canary deployments catch these issues early.
Stop assuming zero downtime means zero risk.
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Auto-published short · category: devops
