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Type: Bug
Resolution: Done
Priority: Major
Fix Version/s: None
Affects Version/s: 4.11.z
Component/s: Networking / DNS
Labels:
None

Activity Type:
Quality / Stability / Reliability
Blocked:
False
Blocked Reason:

Hide

None

Show
None
Story Points:
None
Severity:
Important
Regression:
No

Target Backport Versions:
None
Target Version:
None
Release Blocker:
Rejected
Sprint:
Sprint 238
sprint_count:
1

SFDC Cases Counter:
SFDC Cases Open:
SFDC Cases Links:

PX Priority Data:
PX Impact Score:

Release Note Status:
None
Release Note Type:
Release Note Not Required
Release Note Text:
None

Escape Reason:
None
Escape Impact:
None
Corrective Measures:
None
SDLC stage when should've been found:
None

Description of problem:

My customer hit intermittent CoreDNS error in OCP4.11.5 cluster (# of worker nodes is 8).
Due to the error, Java application failed with "UnknownHostException".
Frequencly: 1-8 times / 8 worker-nodes / day

Version-Release number of selected component (if applicable):

OCP4.11.5

How reproducible:

My customer can not reproduce the same error in the test environment using repeated curl command.

Steps to Reproduce:

1.
2.
3.

Actual results:

Java application: Intermittent UnknownHostException
CoreDNS log:  Intermittent i/o timeout

Expected results:

Java application: no UnknownHostException
CoreDNS log: no i/o timeout

Additional info:

I'll append the detail information later.

Assignee:: Grant Spence

Reporter:: Hideshi Fukumoto

Need Info From:: None

Contributors:: None

QA Contact:: Melvin Joseph

Doc Contact:: None

Votes:: 0 Vote for this issue

Watchers:: 5 Start watching this issue

Created:: 2023/06/13 11:59 AM

Updated:: 2025/09/13 4:02 PM

Resolved:: 2023/07/06 1:19 PM