Bug 1936589

Summary: Cluster DNS service caps TTLs too low and thus evicts from its cache too aggressively
Product: OpenShift Container Platform Reporter: OpenShift BugZilla Robot <openshift-bugzilla-robot>
Component: NetworkingAssignee: Miciah Dashiel Butler Masters <mmasters>
Networking sub component: DNS QA Contact: jechen <jechen>
Status: CLOSED ERRATA Docs Contact:
Severity: high    
Priority: high CC: agabriel, amcdermo, aos-bugs, hongli, jdelft, oarribas, sgreene
Version: 4.8   
Target Milestone: ---   
Target Release: 4.6.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: 2021-04-20 19:27:19 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: 1936587    
Bug Blocks:    

Comment 2 jechen 2021-03-24 12:22:19 UTC 
Waiting for new build that has pull #246
Comment 3 jechen 2021-03-24 22:23:13 UTC 
Verified with  4.6.0-0.nightly-2021-03-24-095127

$ oc get clusterversion
NAME      VERSION                             AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.6.0-0.nightly-2021-03-24-095127   True        False         20m     Cluster version is 4.6.0-0.nightly-2021-03-24-095127


$ oc -n openshift-dns get configmaps/dns-default -o yaml
apiVersion: v1
data:
  Corefile: |
    .:5353 {
        errors
        health
        kubernetes cluster.local in-addr.arpa ip6.arpa {
            pods insecure
            upstream
            fallthrough in-addr.arpa ip6.arpa
        }
        prometheus :9153
        forward . /etc/resolv.conf {
            policy sequential
        }
        cache 900         <--- verified the fix with https://github.com/openshift/cluster-dns-operator/pull/246
        reload
    }
Comment 9 errata-xmlrpc 2021-04-20 19:27:19 UTC 
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 4.6.25 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-2021:1153