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Bug 1684905 - kube-scheduler operator reaches a permanent failure state
Summary: kube-scheduler operator reaches a permanent failure state
Alias: None
Product: OpenShift Container Platform
Classification: Red Hat
Component: Pod
Version: 4.1
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
: 4.1.0
Assignee: ravig
QA Contact: Jianwei Hou
Depends On:
TreeView+ depends on / blocked
Reported: 2019-03-03 19:00 UTC by Derek Carr
Modified: 2019-04-01 21:01 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Last Closed: 2019-04-01 21:01:51 UTC
Target Upstream Version:

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Description Derek Carr 2019-03-03 19:00:39 UTC
Description of problem:

Installed cluster with level 4.0.0-0.alpha-2019-03-02-023844.

Came back to cluster 24hrs later, and kube-scheduler operator is failing with following message:

"Failing: request declared a Content-Length of 2342 but only wrote 0 bytes"

Attempted to upgrade cluster to level 4.0.0-0.alpha-2019-03-02-043149 to resolve.  kube-scheduler-operator stuck reporting that message, no clear idea why.

Comment 2 ravig 2019-03-06 17:23:52 UTC
I looked into the scheduler logs, I see the following error continuously, Failed to list *v1.ReplicationController: Get https://localhost:6443/api/v1/replicationcontrollers?limit=500&resourceVersion=0: dial tcp [::1]:6443: connect: connection refused

And when I looked at API server logs, the api-server is not available which I think is the issue here. I faced similar issue when testing in CI, David and I thought it's a flkae and ignored it. Perhaps we need to investigate more into this.

18:27:45 - Is the time when scheduler gave up trying to communicate with API server. All the 3 api servers(when I looked at logs) seem to be not available during that time. I am curious about the state of controller-manger at that time, was it failing at the same time? I will set up a cluster to see if I can reproduce it.

Comment 3 Seth Jennings 2019-04-01 21:01:51 UTC
We haven't seen this in a long time and having been unable to recreate or develop a theory on how it happens.  Please reopen if it is recreated and make sure to get the kube-scheduler logs from all masters.

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