tree 7ee15b3061afed0633b8f79dcb467452aacd02d6
parent 80a8b8c11d94af39ed26701dc10f2d3fc9e9a042
author Sylvain Desbureaux <sylvain.desbureaux@orange.com> 1567087497 +0200
committer Morgan Richomme <morgan.richomme@orange.com> 1579621559 +0000

Move Storage access to RWO

Today when deploying Robot with OOM, the PersistentVolumeClaim needs the
"ReadWriteMany" (or "RWX") capability.

According to Kubernetes Documentation (https://kubernetes.io/docs/concepts/storage/persistent-volumes/#access-modes),
ReadWriteMany stands for "the volume can be mounted as read-write by many nodes".

That means that a particular PVC needs to be read and written from many pods.
That also means that your code takes that into account and do the work to avoid
write at the same place at the same time.

An issue on RWX mode is that most "official" storage driver from Kubernetes doesn't
support it (13 over the 19 drivers doesn't support it, espacially OpenStack, Amazon
and Google storage classes).

Robot PVC is used only for one Robot instance. Thus we don't need RWX.

Issue-ID: INT-1230
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: I300e34a9d4be40b36153812d2a99c458cae6b2c9