README
¶
Cluster Autoscaler
Introduction
Cluster Autoscaler is a tool that automatically adjusts the size of the Kubernetes cluster when:
- there is a pod that doesn’t have enough space to run in the cluster
- some nodes in the cluster are so underutilized, for an extended period of time, that they can be deleted and their pods will be easily placed on some other, existing nodes.
Releases
We strongly recommend using Cluster Autoscaler with version for which it was meant. We don't do ANY cross version testing so if you put the newest Cluster Autoscaler on an old cluster there is a big chance that it won't work as expected.
| Kubernets Version | CA Version |
|---|---|
| 1.6.X | 0.5.X |
| 1.5.X | 0.4.X |
| 1.4.X | 0.3.X |
Notable changes:
CA Version 0.5:
- CA continues to operate even if some nodes are unready and is able to scale-down them.
- CA exports its status to kube-system/cluster-autoscaler-status config map.
- CA respects PodDisruptionBudgets.
- Azure support.
- Alpha support for dynamic config changes.
- Multiple expanders to decide which node group to scale up.
CA Version 0.4:
- Bulk empty node deletions.
- Better scale-up estimator based on binpacking.
- Improved logging.
CA Version 0.3:
- AWS support.
- Performance improvements around scale down.
Deployment
Cluster Autoscaler runs on the Kubernetes master node (at least in the default setup on GCE and GKE).
It is possible to run customized Cluster Autoscaler inside of the cluster but then extra care needs
to be taken to ensure that Cluster Autoscaler is up and running. User can put it into kube-system
namespace (Cluster Autoscaler doesn't scale down node with non-manifest based kube-system pods running
on them) and mark with scheduler.alpha.kubernetes.io/critical-pod annotation (so that the rescheduler,
if enabled, will kill other pods to make space for it to run).
Right now it is possible to run Cluster Autoscaler on:
- GCE http://kubernetes.io/docs/admin/cluster-management/#cluster-autoscaling
- GKE https://cloud.google.com/container-engine/docs/cluster-autoscaler
- AWS https://github.com/kubernetes/contrib/blob/master/cluster-autoscaler/cloudprovider/aws/README.md
- Azure
FAQ
Is available HERE.
Documentation
¶
There is no documentation for this package.
Source Files
Directories