2017-10-18 14:36:24 +00:00
|
|
|
# Legacy Cluster add-ons
|
|
|
|
|
|
|
|
|
|
For more information on add-ons see [the documentation](https://kubernetes.io/docs/concepts/cluster-administration/addons/).
|
2015-06-02 09:41:13 +00:00
|
|
|
|
2017-02-25 00:42:41 +00:00
|
|
|
## Overview
|
|
|
|
|
|
2016-10-17 20:06:21 +00:00
|
|
|
Cluster add-ons are resources like Services and Deployments (with pods) that are
|
2015-06-16 11:16:30 +00:00
|
|
|
shipped with the Kubernetes binaries and are considered an inherent part of the
|
2017-02-25 00:42:41 +00:00
|
|
|
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](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.
|
2015-06-02 09:41:13 +00:00
|
|
|
|
|
|
|
|
[]()
|
