Overview

If your KubeSphere v2.1.x is installed on Kubernetes 1.15.x+, you can choose to only upgrade KubeSphere to v3.0.0 or upgrade Kubernetes (to a higher version) and KubeSphere (to v3.0.0) at the same time.

Warning

You are supposed to implement a simulation for the upgrade in a testing environment first. After the upgrade is successful in the testing environment and all applications are running normally, upgrade it in your production environment.
During the upgrade process, there may be a short interruption of applications (especially for those single-replica Pod). Please arrange a reasonable period of time for upgrade.

ks-installer was the main installation tool as of KubeSphere v2. For users whose Kubernetes clusters were NOT deployed via , they should choose ks-installer to upgrade KubeSphere. For example, if your Kubernetes is hosted by cloud vendors or self provisioned, please refer to Upgrade with ks-installer.