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DevOps & Automation · Intermediate

Init Container

A container in a pod that runs to completion before the app containers start, used for setup tasks.

Definition

Init containers run sequentially; each must succeed before the next starts. They can wait for dependencies, fetch configuration, or set permissions using tools not included in the app image.

Example

An init container loops until nslookup db succeeds, then the app starts.

Exam tip

Init containers run before and separately from app containers; sidecars run alongside them.

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