Bug 1661106

Summary: [cloud-CA] Clusterautoscaler in 4.0 the flag "--node-group-auto-discovery" are not supported
Product: OpenShift Container Platform Reporter: sunzhaohua <zhsun>
Component: Cloud ComputeAssignee: Andrew McDermott <amcdermo>
Status: CLOSED NOTABUG QA Contact: sunzhaohua <zhsun>
Severity: low Docs Contact:
Priority: low    
Version: 4.1.0CC: jhou, mgugino
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Target Release: 4.1.0   
Hardware: Unspecified   
OS: Unspecified   
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Last Closed: 2019-03-22 12:47:37 UTC Type: Bug
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Description sunzhaohua 2018-12-20 06:51:05 UTC
Description of problem:
The CA in 4.0 discovers all machinesets automatically without any flags needing to be specified. It only uses machinesets that have min/max bounds specified. So even we specify it we don't process it. To avoid misunderstanding, we should hide it or have some explanation.

Version-Release number of selected component (if applicable):
$ bin/openshift-install version
bin/openshift-install v0.7.0-master-52-ga2e193ab5b9501f7ed2758856bc3ae2f24c21a82

How reproducible:
Always

Steps to Reproduce:
1. Deploy cluster autoscaler
2. Set flags "- --node-group-auto-discovery=asg:tag=groupA"
$ oc edit deploy cluster-autoscaler-default
      - args:
        - --logtostderr
        - --cloud-provider=cluster-api
        - --namespace=openshift-cluster-api
        - --node-group-auto-discovery=asg:tag=groupA
        - --scale-down-enabled=true
        - --scale-down-delay-after-add=10s
        - --scale-down-delay-after-delete=10s
        - --scale-down-delay-after-failure=10s
        - --scale-down-unneeded-time=10s

3. Create pod to scale up the cluster and check autoscaler log

Actual results:
This flag has no impact on the autoscaler.

$ oc logs -f cluster-autoscaler-default-6c5f868845-qnm95
I1220 03:18:39.575438       1 scale_up.go:584] Scale-up: setting group openshift-cluster-api/qe-zhsun-worker-us-east-2c size to 3
I1220 03:18:49.743649       1 scale_up.go:584] Scale-up: setting group openshift-cluster-api/qe-zhsun-worker-us-east-2b size to 3

Expected results:
Hiden the flag to avoid misunderstanding.

Additional info:

Comment 2 Michael Gugino 2019-03-22 12:47:37 UTC
The flag node-group-auto-discovery is for the aws provider and operates on existing autoscale groups.  It does not have anything to do with machinesets.