Native sidecar
A native sidecar is a Kubernetes init container with restartPolicy set to Always that runs alongside application containers with sidecar lifecycle ordering.
Kubernetes in Action, Second Edition
A native sidecar is a Kubernetes container configured as an init container with restartPolicy set to Always, giving it sidecar lifecycle ordering and restart behavior.
- How it is used
- Provides a continuously running service to regular containers and later init containers within one pod.
- How deep it goes
- Defines configuration, startup, restart, and shutdown ordering, but stops short of implementation internals.
- Examples
- Uses a traffic meter, network proxy, connectivity checker, application pod, manifest, readiness output, and streamed logs.
- What you can do after
- Build it from scratch by placing an init container with restartPolicy Always before the containers it supports.
Read how Kubernetes in Action, Second Edition explains native sidecar →
Acing the Certified Kubernetes Administrator Exam, Second Edition
A native sidecar container is an init container with an Always restart policy that continues running alongside a pod's main application containers.
- How it is used
- Runs a continuously available supporting process beside a pod’s main application container.
- How deep it goes
- Defines restart behavior and manifest placement, then stops short of deeper container-runtime internals.
- Examples
- Uses log reading, service-resolution waiting, kubectl output, and a busybox-plus-nginx Deployment exercise.
- What you can do after
- Operate/configure native sidecars in pod manifests and verify initialization and Running states with kubectl.
Read how Acing the Certified Kubernetes Administrator Exam, Second Edition explains native sidecar →
Related concepts
- init containerkind of · An init container is a Kubernetes Pod container that performs initialization work to completion before the Pod’s application containers start.
- sidecar processkind of · The sidecar pattern deploys an auxiliary process or component alongside a primary application to provide supporting functionality separately from the application’s core code.
- primary containercontrasts with · A primary container is a pod container that runs the main application workload, distinct from initialization and supporting containers.
- podpart of · A Kubernetes Pod is the smallest deployable unit in Kubernetes, grouping one or more co-located containers that share networking and other resources.
- restart policyconfigured by · A restart policy is a configuration rule specifying whether and when a container or workload is automatically restarted after termination or failure.
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