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Enable support for memory eviction configuration via salt
Added evictions based on memory by default whenever the available memory is < 100Mi.
Updated GCE and GCI.
Automatic merge from submit-queue
Bump cluster autoscaler version and enable scale down by default
Follow up of https://github.com/kubernetes/contrib/pull/1148.
cc: @piosz @fgrzadkowski @jszczepkowski
Automatic merge from submit-queue
Add collection of the new glbc and cluster-autoscaler logs
I've incremented the version numbers by 2 to avoid conflicting with #26652. I'll make sure the potential conflict between the images gets resolved reasonably.
cc @piosz @bprashanth @aledbf
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Switch DNS addons from skydns to kubedns
Change GCI and trusty cluster-helper scripts to use kubedns instead of skydns.
Unified skydns templates using a simple underscore based template and
added transform sed scripts to transform into salt and sed yaml
templates
Moved all content out of cluster/addons/dns into build/kube-dns and
saltbase/salt/kube-dns
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Add node problem detector as an addon pod.
```release-note
Introduce a new add-on pod NodeProblemDetector.
NodeProblemDetector is a DaemonSet running on each node, monitoring node health and reporting
node problems as NodeCondition and Event. Currently it already supports kernel log monitoring, and
will support more problem detection in the future. It is enabled by default on gce now.
```
This PR enables NodeProblemDetector as an add-on pod.
/cc @mikedanese @kubernetes/sig-node
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Configuration for GCP webhook authentication and authorization
This PR adds configuration for GCP webhook authentication and authorization in ContainerVM and GCI. The change of configure-vm.sh and kube-apiserver.manifest is directly copied from @cjcullen's PR #25380 and #25296. The change in GCI script configure-helper.sh includes the support for webhook authentication and authorization, and also some code refactor to improve readability.
@cjcullen @roberthbailey @zmerlynn please review it. The original PRs are P1, please mark this as P1.
cc/ @fabioy @kubernetes/goog-image FYI.
I verified it by running e2e tests on GCI cluster. Without the GCI side change, cluster creation fails as being capture by GKE Jenkins tests. I don't test when the two env GCP_AUTHN_URL and GCP_AUTHZ_URL are set, because they are only set in GKE. After this PR is merged, @cjcullen will test in GKE.
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Salt configuration for the new Cluster Autoscaler for GCE
Adds support for cloud autoscaler from contrib/cloud-autoscaler in kube-up.sh GCE script.
cc: @fgrzadkowski @piosz
