kube-apiserver and kubelet open file descriptors over time

k8s-open-file-descriptors.md

While running a 3-host K8s v1.11.0 cluster (where all nodes are masters and workers) on Azure, it appears as though the number of open file descriptors increases steadily over time for kube-apiserver and kubelet. All other K8s components have low and steady numbers of open file descriptors.

Heketi is running in the cluster, with Host 0 and Host 1 each having one glusterfs brick. Host 2 has no glusterfs bricks.

kube-apiserver-fd.svg

kubelet-fd.svg