Bug 1754127

Summary: kubernetes.default.svc fails to resolve after updating from RHEL7.6 to RHEL 7.7
Product: OpenShift Container Platform Reporter: Taneem Ibrahim <tibrahim>
Component: NetworkingAssignee: Dan Mace <dmace>
Networking sub component: router QA Contact: Hongan Li <hongli>
Status: CLOSED DUPLICATE Docs Contact:
Severity: urgent    
Priority: unspecified CC: aos-bugs, rhowe, syangsao, xtian
Version: 3.11.0   
Target Milestone: ---   
Target Release: 3.11.z   
Hardware: Unspecified   
OS: Linux   
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Clone Of: Environment:
Last Closed: 2019-09-24 19:02:42 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Taneem Ibrahim 2019-09-20 22:45:08 UTC 
Description of problem:

Customer is having issues with DNS after patching to RHEL 7.7. We have the tuned update applied [https://bugzilla.redhat.com/show_bug.cgi?id=1739563].

why does host kubernetes.default.svc resolve successfully for a node in RHEL 7.6 but not in RHEL 7.7?

In RHEL 7.6:

host kubernetes.default.svc
kubernetes.default.svc.cluster.local has address XX.XX.XX.XX

In RHEL 7.7:

host kubernetes.default.svc
Host kubernetes.default.svc not found: 3(NXDOMAIN)

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

RHEL 7.7
OpenShift 3.11.59

How reproducible:

Always (in customer environment)

Steps to Reproduce:

1. Upgrade to RHEL 7.7 with OCP v3.11.59 
2. Run host kubernetes.default.svc
3. Fails to resolve

Actual results:

Host kubernetes.default.svc not found: 3(NXDOMAIN)

Expected results:

kubernetes.default.svc.cluster.local has address XX.XX.XX.XX

Additional info:
Comment 5 Taneem Ibrahim 2019-09-24 19:02:42 UTC 
Found the root cause :

https://bugzilla.redhat.com/show_bug.cgi?id=1743572

*** This bug has been marked as a duplicate of bug 1743572 ***