This guide explains step‑by‑step how to modify the instance_type of an AWS EC2 instance using Terraform, covering in‑place updates, required stop‑modify‑start cycles, plan inspection, apply execution, and post‑change verification to ensure the root EBS volume remains intact.
This proposal introduces in‑place vertical scaling for Pods by making PodSpec resources mutable, extending PodStatus with ResourcesAllocated, adding ResizePolicy and Resize fields, and updating the CRI UpdateContainerResources and ContainerStatus APIs to support live CPU and memory adjustments without restarting containers.
OpenKruise v1.0 introduces a suite of cloud‑native enhancements for Kubernetes, including in‑place upgrades for env variables, a new ResourceDistribution CRD for cross‑namespace resource syncing, container launch priority controls, an extended kubectl‑kruise plugin, and numerous optimizations across workloads and controllers.
Kubernetes performs in‑place container upgrades by detecting spec changes, computing pod actions that selectively kill and restart only the affected containers while preserving the pod sandbox, allowing sidecar updates without full pod recreation, reducing downtime and enabling custom operators for gray‑scale rolling upgrades.
