K3s Update

Backend services

Updates and custom settings are automatically applied to all backend services using Fleet as long as the cluster has access to the public internet and can connect to the management server.

In case there’s no internet connection or the management server is down, the cluster agent will keep trying to reach the management server until a connection can be established.

K3s cluster

To upgrade K3s from an older version to a specific version you can run the following command:

Stop the old k3s binary (e.g. systemctl stop k3s) and start it again (e.g. systemctl start k3s). For more details please refer to the official documentation.

Certificates

By default, certificates in K3s expire in 12 months. If the certificates are expired or have fewer than 90 days remaining before they expire, the certificates are rotated when K3s is restarted.