Bug 1967766
Summary: | DNS SRV request which worked in 4.7.9 stopped working in 4.7.11 | ||
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Product: | OpenShift Container Platform | Reporter: | OpenShift BugZilla Robot <openshift-bugzilla-robot> |
Component: | Networking | Assignee: | Stephen Greene <sgreene> |
Networking sub component: | DNS | QA Contact: | Hongan Li <hongli> |
Status: | CLOSED ERRATA | Docs Contact: | |
Severity: | urgent | ||
Priority: | high | CC: | aos-bugs, breit, dyocum, mjoseph, mmasters, pducai, sgreene, wking |
Version: | 4.6 | Keywords: | Regression |
Target Milestone: | --- | ||
Target Release: | 4.7.z | ||
Hardware: | All | ||
OS: | All | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | Bug Fix | |
Doc Text: |
Cause:
The fix for Bug 1953097 enabled the CoreDNS Bufsize plugin with a size of 1232 bytes. Some primitive DNS resolvers are not capable of receiving DNS response messages over UDP that are greater than 512 bytes. Note that DNS resolvers that retry lookups using TCP (such as Dig) are not affected by this bug.
Consequence:
Some DNS resolvers (such as Go's internal DNS library) are unable to receive long-winded DNS responses from openshift-dns.
Fix:
Set the CoreDNS bufsize to 512 bytes for all servers.
Result:
DNS Clients that require UDP DNS messages to not exceed 512 bytes function as expected.
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Story Points: | --- |
Clone Of: | Environment: | ||
Last Closed: | 2021-06-29 04:19:45 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: | |||
Bug Depends On: | 1966116 | ||
Bug Blocks: | 1970140 |
Comment 1
Hongan Li
2021-06-07 02:15:07 UTC
PR has been merged into 4.7.0-0.nightly-2021-06-09-233032, moving to verified *** Bug 1970889 has been marked as a duplicate of this bug. *** OpenShift engineering has decided to not ship Red Hat OpenShift Container Platform 4.7.17 due a regression https://bugzilla.redhat.com/show_bug.cgi?id=1973006. All the fixes which were part of 4.7.17 will be now part of 4.7.18 and planned to be available in candidate channel on June 23 2021 and in fast channel on June 28th. *** Bug 1970577 has been marked as a duplicate of this bug. *** Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (OpenShift Container Platform 4.7.18 bug fix update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2021:2502 |