kubernetes
/
autoscaler
mirror of https://github.com/kubernetes/autoscaler.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

CA in GA - FAQ

This commit is contained in:
Marcin Wielgus 2017-10-03 16:52:45 +02:00
parent 9463484ec4
commit d4cfd3423f
1 changed files with 23 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
cluster-autoscaler/FAQ.md
View File

@ -15,6 +15,7 @@ this document:
* [When does Cluster Autoscaler change the size of a cluster?](#when-does-cluster-autoscaler-change-the-size-of-a-cluster) * [When does Cluster Autoscaler change the size of a cluster?](#when-does-cluster-autoscaler-change-the-size-of-a-cluster)
* [What types of pods can prevent CA from removing a node?](#what-types-of-pods-can-prevent-ca-from-removing-a-node) * [What types of pods can prevent CA from removing a node?](#what-types-of-pods-can-prevent-ca-from-removing-a-node)
* [Which version on Cluster Autoscaler should I use in my cluster?](#which-version-on-cluster-autoscaler-should-i-use-in-my-cluster) * [Which version on Cluster Autoscaler should I use in my cluster?](#which-version-on-cluster-autoscaler-should-i-use-in-my-cluster)
* [Is Cluster Autoscaler an Alpha, Beta or GA product?](#is-cluster-autoscaler-an-alpha-beta-or-ga-product)
* [How does Horizontal Pod Autoscaler work with Cluster Autoscaler?](#how-does-horizontal-pod-autoscaler-work-with-cluster-autoscaler) * [How does Horizontal Pod Autoscaler work with Cluster Autoscaler?](#how-does-horizontal-pod-autoscaler-work-with-cluster-autoscaler)
* [What are the key best practices for running Cluster Autoscaler?](#what-are-the-key-best-practices-for-running-cluster-autoscaler) * [What are the key best practices for running Cluster Autoscaler?](#what-are-the-key-best-practices-for-running-cluster-autoscaler)
* [Should I use a CPU-usage-based node autoscaler with Kubernetes?](#should-i-use-a-cpu-usage-based-node-autoscaler-with-kubernetes) * [Should I use a CPU-usage-based node autoscaler with Kubernetes?](#should-i-use-a-cpu-usage-based-node-autoscaler-with-kubernetes)
@ -85,6 +86,7 @@ there is a big chance that it won't work as expected.
| Kubernetes Version | CA Version | | Kubernetes Version | CA Version |
|--------|--------| |--------|--------|
| 1.8.X | 1.0.X |
| 1.7.X | 0.6.X | | 1.7.X | 0.6.X |
| 1.6.X | 0.5.X, 0.6.X<sup>*</sup> | | 1.6.X | 0.5.X, 0.6.X<sup>*</sup> |
| 1.5.X | 0.4.X | | 1.5.X | 0.4.X |
@ -92,6 +94,27 @@ there is a big chance that it won't work as expected.
<sup>*</sup>Cluster Autoscaler 0.5.X is the official version shipped with k8s 1.6. We've done some basic tests using k8s 1.6 / CA 0.6 and we're not aware of any problems with this setup. However, CA internally simulates k8s scheduler and using different versions of scheduler code can lead to subtle issues. <sup>*</sup>Cluster Autoscaler 0.5.X is the official version shipped with k8s 1.6. We've done some basic tests using k8s 1.6 / CA 0.6 and we're not aware of any problems with this setup. However, CA internally simulates k8s scheduler and using different versions of scheduler code can lead to subtle issues.
### Is Cluster Autoscaler an Alpha, Beta or GA product?
Sice version 1.0.0 we consider CA as GA. It means that:
* We have enough confidence that it does what it is expected to do. Each commit goes through a big suite of unit tests
with more than 75% coverage (on average). We have a series of e2e tests that validate that CA works well on
[GCE](https://k8s-testgrid.appspot.com/sig-autoscaling#gce-autoscaling)
and [GKE](https://k8s-testgrid.appspot.com/sig-autoscaling#gke-autoscaling).
Due to the missing testing infrastructure, AWS (or any other cloud provider) compatiblitiy
tests are not the part of the standard development or release procedure.
However there is a number of AWS users who run CA in their production environment and submit new code, patches and bug reports.
* It was tested that CA scales well. CA should handle up to 1000 nodes running 30 pods each. Our testing procedure is described
[here](https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/proposals/scalability_tests.md).
* Most of the pain-points reported by the users (like too short graceful termination support) were fixed, however
some of the less critical feature requests are yet to be implemented.
* CA has decent monitoring, logging and eventing.
* CA tries to handle most of the error situations in the cluster (like cloud provider stockouts, broken nodes, etc).
* CA developers are committed to maintaining and supporting CA in the foreseeble future.
All of the previous versions (earlier that 1.0.0) are considered beta.
### How does Horizontal Pod Autoscaler work with Cluster Autoscaler? ### How does Horizontal Pod Autoscaler work with Cluster Autoscaler?
Horizontal Pod Autoscaler changes the deployment's or replicaset's number of replicas based on the current Horizontal Pod Autoscaler changes the deployment's or replicaset's number of replicas based on the current