> For the complete documentation index, see [llms.txt](https://platform9.com/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://platform9.com/kb/pmk/frequently-asked-questions/kubernetes-api-endpoint-access-loss-during-cluster-upgrade.md). # Kubernetes API Endpoint Access Loss During Cluster Upgrade ## Problem During the master node upgrade part of the BareOS cluster upgrade in PMK, currently, the user losses access to the K8s API endpoint for up to 15 – 30 sec due to VIP change as the VIP fails over if the node or network goes down immediately. ## Environment * Platform9 Managed Kubernetes - All Versions * Feature * Keepalived ## Answer 1. Keepalived is configured to perform a health check every 10 seconds. Thus, if the K8s Apiserver goes down right after the health check, it would take 9-10s for the next check + election time + upstream switch cache update to take place. 2. An optimization feature request [PMK8-I-136](https://pf9.aha.io/ideas/ideas/PMK8-I-136) has been filed to look into ways in which this switchover time can be reduced during upgrades by bringing down keepalived first, forcing a VIP failover before bringing down the K8s Apiserver as part of the *pf9-kube service* stop process which would bring down the switchover time during upgrade significantly (in terms of % total time compared to the current time). --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://platform9.com/kb/pmk/frequently-asked-questions/kubernetes-api-endpoint-access-loss-during-cluster-upgrade.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.