Bug 1626248
Summary: | intermittent shortlived dns resolution failures for internal and external traffic | ||
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Product: | OpenShift Container Platform | Reporter: | Steven Walter <stwalter> |
Component: | Networking | Assignee: | Ben Bennett <bbennett> |
Networking sub component: | router | QA Contact: | zhaozhanqi <zzhao> |
Status: | CLOSED DUPLICATE | Docs Contact: | |
Severity: | urgent | ||
Priority: | urgent | CC: | aos-bugs, bbennett, dkaylor, dmace, jmalde, knakai, openshift-bugs-escalate, rhowe, scuppett, stwalter |
Version: | 3.9.0 | ||
Target Milestone: | --- | ||
Target Release: | 3.9.z | ||
Hardware: | Unspecified | ||
OS: | Unspecified | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | If docs needed, set a value | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2018-10-05 17:12:25 UTC | Type: | Bug |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: |
Description
Steven Walter
2018-09-06 20:59:14 UTC
- For the external failure, we see nothing in the dnsmasq logs. There are plenty of entries around the time of failure but nothing shows for the failure itself. It's as if the pod didn't reach out to the node. - For the internal service failure, we do see a NODATA-IPv4 message in the dnsmasq logs. We have some logging options added to the node but cannot find any info in the journal. We'd like to find a way to get some visibility into what SkyDNS is doing. The "--loglevel=2 --logspec=dns*=8" options don't seem to give us what we are looking for. - We do not see any evidence that dnsmasq is being overwhelmed and the times of failure do not correlate with peak utilization times for the apps involved. Note: The issue resolves itself in a few seconds or a minute or two, without further action, and the pod continues to run it appears. I will upload in private comment a few attachments with examples. *** This bug has been marked as a duplicate of bug 1614331 *** Ansible installer has had the min-port fix since 8/13: https://github.com/openshift/openshift-ansible/pull/9541 *** This bug has been marked as a duplicate of bug 1614983 *** |