By default, we should set the priority class to one of the built-in
priority class names to ensure that pods critical to the storage
will be able to remain running when resources are low. Otherwise,
critical rook pods could be evicted and affect many other pods
that rely on the storage to continue functioning. The options have
been available in the CRs, but until now we have just not set the
defaults in the examples. Critical rook components are now set to
the priority class system-node-critical if they are generally pinned
to a node, and system-cluster-critical if they are critical to the storage.
Some pods such as the operator and crash collector do not have a
default priority class set in the examples since they don't affect
the data path.
Signed-off-by: Travis Nielsen <tnielsen@redhat.com>
Allow specifying daemon startup probes where we also allow configuring
liveness probes. Startup probes allow Rook to tolerate when Ceph daemons
occasionally take a long time to start up while not also making
Kubernetes liveness probes slower to detect runtime failures of daemons.
Startup probes are beta in Kubernetes 1.18, so we should not enable
probes by default for earlier Kubernetes versions.
Signed-off-by: Blaine Gardner <blaine.gardner@redhat.com>
Travis Nielsen
Blaine Gardner
Sébastien Han