How to Investigate External-Dns Errors
When there are errors in external-dns logs, “ErrorsInExternalDNS” alert sent to the low priority slack channel.
If we see an ErrorsInExternalDNS alert in low-priority-alerts, this is usually due to a external-dns have an issue to write records to Route-53 for a particual hosted zones. You can see errors from the external-dns pod by running:
kubectl logs -n kube-system external-dns-<pod-id> -f
You’ll see errors similar to:
level=error msg="InvalidChangeBatch: [RDATA character limit of 32000 exceeded.]" level=error msg="InvalidChangeBatch: [RRSet with DNS name _external_dns.development.moj.service.justice.gov.uk., type TXT cannot be created as other RRSets exist with the same name and type., RRSet with DNS name development.moj.service.justice.gov.uk., type A cannot be created as other RRSets exist with the same name and type.]" level=error msg="InvalidChangeBatch: [Tried to delete resource record set [name='_external_dns.test.live.cloud-platform.service.justice.gov.uk.', type='TXT', set-identifier='test-live-1'] but it was not found, Tried to delete resource record set [name='test.live.cloud-platform.service.justice.gov.uk.', type='A', set-identifier='test-live-1'] but it was not found] level=error msg="InvalidChangeBatch: [Tried to create resource record set [name='cluster-cname-thisingress.example.', type='TXT'] but it already exists, Tried to create resource record set [name='cluster-thisingress.example.', type='TXT'] but it already exists] level=error msg="failed to submit all changes for the following zones: [/hostedzone/ABCDEFGHIJKLMN /hostedzone/NMLKJIHGFEDCBA]"
Identify the ingress causing the error in question and fix the ingress depending upon the error message. We may need to inform users to update their ingress causing the error.
Follow this troubleshoot guide for common error messages to determine the error’s cause and how to troubleshoot it.
Once the error is cleared, you will see info logs similar to:
level=info msg="Applying provider record filter for domains: [dev.example. .dev.example.]" level=info msg="Desired change: CREATE cluster-a-new.dev.example TXT [Id: /hostedzone/ZZZ]" level=info msg="All records are already up to date"
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