K8s API VIP Interface Undefined: "Cant find interface bond0 for vrrp_instance K8S_APISERVER"

Problem

• All nodes within a Platform9 Managed Kubernetes (PMK) cluster appear to be in a "NotReady" state.

• In the PMK UI, the nodes may appear to similarly be in a "failed" state.

• In the pf9-kube service log on the respective master node(s), the following error is observed.

-- /var/log/pf9/kube/kube.log --

None

Keepalived_vrrp[5262]: Cant find interface bond0 for vrrp_instance K8S_APISERVER !!!

Environment

• Platform9 Managed Kubernetes - All Versions

• Keepalived

• Qbert

Cause

The interface which was specified for the VIP – bond0, for example – on the master node no longer exists.

Resolution

1. Identify the VIP interface provided during the time of configuration as defined in /etc/pf9/kube.env on the master node.

None

export MASTER_VIP_IFACE="bond0"

1. Ensure that the specified interface exists.

2. If the interface does not exist – configure it, and then reboot the node (especially to ensure that its configuration persists).

Note: If it is desired to modify the VIP interface, it cannot be patched via the Qbert (cluster-management) API and, thus, unfortunately, you must otherwise re-create the cluster.