9816b43188
Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Update default etcd server to 3.2 for kubernetes 1.11 Repply #59836 but with latest etcd 3.2 patch version (3.2.18 which includes mvcc fix and leader election timeout fix) and default `--snapshot-count` to 10k to resolve performance regression in previous etcd 3.2 server upgrade attempt (https://github.com/kubernetes/kubernetes/issues/60589#issuecomment-372458578). See https://github.com/kubernetes/kubernetes/issues/60589#issuecomment-372458578 for details on the root cause of the performance regression and scalability test results of setting `--snapshot-count` to 10k. ```release-note Upgrade the default etcd server version to 3.2.18 ``` @gyuho @shyamjvs @jdumars @timothysc
Legacy Cluster add-ons
For more information on add-ons see the documentation.
Overview
Cluster add-ons are resources like Services and Deployments (with pods) that are shipped with the Kubernetes binaries and are considered an inherent part of the Kubernetes clusters.
There are currently two classes of add-ons:
- Add-ons that will be reconciled.
- Add-ons that will be created if they don't exist.
More details could be found in addon-manager/README.md.
Cooperating Horizontal / Vertical Auto-Scaling with "reconcile class addons"
"Reconcile" class addons will be periodically reconciled to the original state given
by the initial config. In order to make Horizontal / Vertical Auto-scaling functional,
the related fields in config should be left unset. More specifically, leave replicas
in ReplicationController / Deployment / ReplicaSet unset for Horizontal Scaling,
leave resources for container unset for Vertical Scaling. The periodic reconcile
won't clobbered these fields, hence they could be managed by Horizontal / Vertical
Auto-scaler.
Add-on naming
The suggested naming for most of the resources is <basename> (with no version number).
Though resources like Pod, ReplicationController and DaemonSet are exceptional.
It would be hard to update Pod because many fields in Pod are immutable. For
ReplicationController and DaemonSet, in-place update may not trigger the underlying
pods to be re-created. You probably need to change their names during update to trigger
a complete deletion and creation.