In kubernetes 1.2 every 20 seconds in our kubelet logs we see many of the following log lines.
Is this expected behaviour? They seem to coincide with high CPU usage from the kubelet process. On this particular node no new pods have been deployed for 2 days - so this does not coincide with the creation of pods.
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.706297 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 00126ffb-1904-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.706464 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 001285f0-1904-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.706502 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 001285f0-1904-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.706617 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 00129876-1904-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.706655 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 00129876-1904-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.706777 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 0012c849-1904-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.706827 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 0012c849-1904-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.706952 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 004cfabd-1904-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.706991 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 004cfabd-1904-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.707122 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 0127085b-16cb-11e6-9cb4-00163e1b3b81
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.707161 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 0127085b-16cb-11e6-9cb4-00163e1b3b81/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.707294 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 01b0b20c-1904-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.707340 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 01b0b20c-1904-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.707453 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 01c01c42-1904-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.707490 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 01c01c42-1904-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.707607 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 0233ff42-1904-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.707644 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 0233ff42-1904-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.707784 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 027dee6c-1904-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.707821 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 027dee6c-1904-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.707950 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 03e74e54-1904-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.708018 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 03e74e54-1904-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.708161 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 0e54291f-18f2-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.708207 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 0e54291f-18f2-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.708316 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 14f313d5-16cd-11e6-9cb4-00163e1b3b81
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.708355 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 14f313d5-16cd-11e6-9cb4-00163e1b3b81/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.708471 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 2bf78c9d-1904-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.708509 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 2bf78c9d-1904-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.708634 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 3724f295-16c7-11e6-9cb4-00163e1b3b81
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.708673 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 3724f295-16c7-11e6-9cb4-00163e1b3b81/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.708792 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 383a146a-17a2-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.708831 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 383a146a-17a2-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.708959 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 42e0108a-16c5-11e6-9cb4-00163e1b3b81
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.709025 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 42e0108a-16c5-11e6-9cb4-00163e1b3b81/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.709151 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 4c745286-179b-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.709189 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 4c745286-179b-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.709301 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 56d21cb3-185a-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.709339 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 56d21cb3-185a-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.709451 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 5a150a98-185a-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.709490 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 5a150a98-185a-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.709613 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 5d8ee492-185a-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.709674 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 5d8ee492-185a-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.709787 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 6ad52938-1834-11e6-874e-00163e1b3b80
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.709836 6805 volumes.go:316] Used volume plugin "kubernetes.io/secret" to unmount 6ad52938-1834-11e6-874e-00163e1b3b80/kubernetes.io~secret
May 17 10:54:16 boxtest-2 kubelet[6805]: I0517 10:54:16.709953 6805 volumes.go:234] Making a volume.Cleaner for volume kubernetes.io~secret/default-token-ckjjp of pod 6bf10079-1903-11e6-874e-00163e1b3b80Kubelet periodically checks the volumes and examines whether any of them needs to be unmounted/detached. In the process of doing that, it gets a list of volumes and their unmounter/detachers, in case cleanup is required. These messages are a side-effect of this checkup, and they do not mean that the volumes are unmounted. The verbosity of the log messages have been adjusted in HEAD (post v1.2+) to avoid further confusion.