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How Does the Kubernetes Scheduler Actually Work?

From a pod sitting in Pending to finally running on a worker node—let's understand what happens behind the scenes of the Kubernetes Scheduler.

6 min read3 days ago

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Your pod is stuck in Pending. What’s happening?

Let’s say you’ve deployed an application, but when you check its status, you see:

STATUS: Pending

The pod hasn’t been assigned to a node yet.

This is where the Kubernetes scheduler comes into the picture.

Its job is to find a suitable node for every pod that needs scheduling.

But the scheduler does much more than simply pick a machine.

Let’s look at what happens behind the scenes.

1. The scheduling…

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DevOps voice
DevOps voice

Written by DevOps voice

17+ years of IT professional experience, focused on DevOps, DevSecOps, SRE, and cloud engineering. Goal is simple to make complex concepts easy to understand

Beyond Localhost
Beyond Localhost

Published in Beyond Localhost

Engineering that ships. War stories first: incidents, migrations, benchmarks and the on-call reality behind the slides. System design, infra, Kubernetes, backend. No hype, no product pitches. Want to write for us? Open the Write for Us tab.