rfc2136 continually removing then adding A records that have more than 1 target #1596

stefanlasiewski · 2020-05-23T01:27:24Z

What happened:

External DNS with the rfc2136 provider is continually Removing then re-adding DNS records.

What you expected to happen:

I expect External DNS to add records once, and then only update them on occasion when it detects a change.

How to reproduce it (as minimally and precisely as possible):

Install the cluster

Install Rancher 2.4.4 (This shouldn't' be necessary)
Install a v1.16.8 Kubernetes cluster
Add external-dns via the Bitnami chart at https://charts.bitnami.com/bitnami
Configure with settings similar to the following:

---
  domainFilters: ["cluster.example.org"]
  interval: "1m"
  policy: "sync"
  provider: "rfc2136"
  rfc2136: 
    host: "ns1.example.org'
    port: "53"
    tsigAxfr: "true"
    tsigKeyname: "keyname"
    tsigSecret: "key/key"
    tsigSecretAlg: "hmac-sha512"
    zone: "cluster.example.org."
  sources: [ingress]
  txtOwnerId: "cluster1"

Configure an ingress.
Wait a couple of days. Do normal things like upgrade external-dns to the next version of the chart, etc. Come back, and notice how existing DNS records are being updated every minute:

time="2020-05-23T01:17:10Z" level=debug msg="Record=lb.app.example.org.\t60\tIN\tA\t10.11.12.99"                                                                                                                   
time="2020-05-23T01:17:10Z" level=debug msg="Record=lb.app.example.org.\t60\tIN\tA\t10.11.12.101"                                                                                                                  
time="2020-05-23T01:17:10Z" level=debug msg="Record=lb.app.example.org.\t60\tIN\tTXT\t\"heritage=external-dns,external-dns/owner=cluster1,external-dns/resource=ingress/app/lb\""                                  time="2020-05-23T01:17:10Z" level=debug msg="Endpoints generated from ingress: app/lb: [lb.app.example.org 0 IN A  10.11.12.101 []]"                                                                               
time="2020-05-23T01:17:10Z" level=debug msg="RemoveRecord.ep=lb.app.example.org 0 IN A  10.11.12.101 []"                                                                                                           
time="2020-05-23T01:17:10Z" level=info msg="Removing RR: lb.app.example.org 0 A 10.11.12.101"                                                                                                                      
time="2020-05-23T01:17:10Z" level=debug msg="AddRecord.ep=lb.app.example.org 0 IN A  10.11.12.101 []"                                                                                                              
time="2020-05-23T01:17:10Z" level=info msg="Adding RR: lb.app.example.org 60 A 10.11.12.101"                                                                                                                       
time="2020-05-23T01:17:10Z" level=debug msg="RemoveRecord.ep=lb.app.example.org 0 IN TXT  \"heritage=external-dns,external-dns/owner=cluster1,external-dns/resource=ingress/app/lb\" []"                           
time="2020-05-23T01:17:10Z" level=info msg="Removing RR: lb.app.example.org 0 TXT \"heritage=external-dns,external-dns/owner=cluster1,external-dns/resource=ingress/app/lb\""                                      time="2020-05-23T01:17:10Z" level=debug msg="AddRecord.ep=lb.app.example.org 0 IN TXT  \"heritage=external-dns,external-dns/owner=cluster1,external-dns/resource=ingress/app/lb\" []"                              
time="2020-05-23T01:17:10Z" level=info msg="Adding RR: lb.app.example.org 60 TXT \"heritage=external-dns,external-dns/owner=cluster1,external-dns/resource=ingress/app/lb\""                                                                                                                                                                                                                                                          
time="2020-05-23T01:18:10Z" level=debug msg="Record=lb.app.example.org.\t60\tIN\tA\t10.11.12.99"                                                                                                                   
time="2020-05-23T01:18:10Z" level=debug msg="Record=lb.app.example.org.\t60\tIN\tA\t10.11.12.101"                                                                                                                  
time="2020-05-23T01:18:10Z" level=debug msg="Record=lb.app.example.org.\t60\tIN\tTXT\t\"heritage=external-dns,external-dns/owner=cluster1,external-dns/resource=ingress/app/lb\""                                  time="2020-05-23T01:18:10Z" level=debug msg="Endpoints generated from ingress: app/lb: [lb.app.example.org 0 IN A  10.11.12.101 []]"                                                                               
time="2020-05-23T01:18:10Z" level=debug msg="RemoveRecord.ep=lb.app.example.org 0 IN A  10.11.12.101 []"                                                                                                           
time="2020-05-23T01:18:10Z" level=info msg="Removing RR: lb.app.example.org 0 A 10.11.12.101"                                                                                                                      
time="2020-05-23T01:18:10Z" level=debug msg="AddRecord.ep=lb.app.example.org 0 IN A  10.11.12.101 []"                                                                                                              
time="2020-05-23T01:18:10Z" level=info msg="Adding RR: lb.app.example.org 60 A 10.11.12.101"                                                                                                                       time="2020-05-23T01:18:10Z" level=debug msg="RemoveRecord.ep=lb.app.example.org 0 IN TXT  \"heritage=external-dns,external-dns/owner=cluster1,external-dns/resource=ingress/app/lb\" []"                           
time="2020-05-23T01:18:10Z" level=info msg="Removing RR: lb.app.example.org 0 TXT \"heritage=external-dns,external-dns/owner=cluster1,external-dns/resource=ingress/app/lb\""                                      
time="2020-05-23T01:18:10Z" level=debug msg="AddRecord.ep=lb.app.example.org 0 IN TXT  \"heritage=external-dns,external-dns/owner=cluster1,external-dns/resource=ingress/app/lb\" []"                              
time="2020-05-23T01:18:10Z" level=info msg="Adding RR: lb.app.example.org 60 TXT \"heritage=external-dns,external-dns/owner=cluster1,external-dns/resource=ingress/app/lb\""

The resulting commandline is:

external-dns --log-level=info --log-format=text --domain-filter=cluster.example.org --policy=sync --provider=rfc2136 --registry=txt --interval=1m --txt-owner-id=cluster1-dev --source=ingress --rfc2136-host=ns1.example.org --rfc2136-port=53 --rfc2136-zone=cluster.example.org. --rfc2136-min-ttl=20s --rfc2136-tsig-secret-alg=... --rfc2136-tsig-keyname=... --rfc2136-tsig-axfr

Anything else we need to know?:

Environment:

External-DNS version (use external-dns --version): v0.7.1
DNS provider: rfc2136
Others:

The text was updated successfully, but these errors were encountered:

stefanlasiewski · 2020-05-23T01:34:13Z

I created another new record, and the same problem is not happening:

time="2020-05-23T01:30:10Z" level=debug msg="Record=lb.app2.example.org.\t60\tIN\tTXT\t\"heritage=external-dns,external-dns/owner=cluster1,external-dns/resource=ingress/app2/lb\""                                                   
time="2020-05-23T01:30:10Z" level=debug msg="Record=lb.app2.example.org.\t60\tIN\tA\t10.11.12"                                                                                                                                        
time="2020-05-23T01:30:10Z" level=debug msg="Endpoints generated from ingress: app2/lb: [lb.app2.example.org 0 IN A  10.11.12 []]"                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
time="2020-05-23T01:31:10Z" level=debug msg="Record=lb.app2.example.org.\t60\tIN\tTXT\t\"heritage=external-dns,external-dns/owner=cluster1,external-dns/resource=ingress/app2/lb\""                                                   time="2020-05-23T01:31:10Z" level=debug msg="Record=lb.app2.example.org.\t60\tIN\tA\t10.11.12"                                                                                                                                        time="2020-05-23T01:31:10Z" level=debug msg="Endpoints generated from ingress: app2/lb: [lb.app2.example.org 0 IN A  10.11.12 []]"

stefanlasiewski · 2020-05-23T01:36:00Z

Hm, this is strange.

The removing records have a zero-second TTL:

"Removing RR: lb.app.example.org 0 A 10.11.12.101"

But the adding records have a 60 second TTL, which is something I configured a couple of days ago:

"Adding RR: lb.app.example.org 60 A 10.11.12.101"

Is that wrong?

brpaz · 2020-05-23T17:19:50Z

The same is happening with the Cloudflare provider.

Example:

time="2020-05-07T18:35:52Z" level=info msg="Changing record." action=UPDATE record=labs.brunopaz.dev targets=1 ttl=1 type=A zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:35:52Z" level=info msg="Changing record." action=UPDATE record=directus.brunopaz.dev targets=1 ttl=1 type=A zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:35:53Z" level=info msg="Changing record." action=UPDATE record=golang-api.brunopaz.dev targets=1 ttl=1 type=A zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:35:53Z" level=info msg="Changing record." action=UPDATE record=labs.brunopaz.dev targets=1 ttl=1 type=TXT zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:35:54Z" level=info msg="Changing record." action=UPDATE record=directus.brunopaz.dev targets=1 ttl=1 type=TXT zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:35:54Z" level=info msg="Changing record." action=UPDATE record=golang-api.brunopaz.dev targets=1 ttl=1 type=TXT zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:36:51Z" level=info msg="Changing record." action=UPDATE record=directus.brunopaz.dev targets=1 ttl=1 type=A zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:36:52Z" level=info msg="Changing record." action=UPDATE record=labs.brunopaz.dev targets=1 ttl=1 type=A zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:36:52Z" level=info msg="Changing record." action=UPDATE record=golang-api.brunopaz.dev targets=1 ttl=1 type=A zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:36:53Z" level=info msg="Changing record." action=UPDATE record=directus.brunopaz.dev targets=1 ttl=1 type=TXT zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:36:53Z" level=info msg="Changing record." action=UPDATE record=labs.brunopaz.dev targets=1 ttl=1 type=TXT zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:36:54Z" level=info msg="Changing record." action=UPDATE record=golang-api.brunopaz.dev targets=1 ttl=1 type=TXT zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:37:51Z" level=info msg="Changing record." action=UPDATE record=directus.brunopaz.dev targets=1 ttl=1 type=A zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:37:52Z" level=info msg="Changing record." action=UPDATE record=golang-api.brunopaz.dev targets=1 ttl=1 type=A zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:37:52Z" level=info msg="Changing record." action=UPDATE record=labs.brunopaz.dev targets=1 ttl=1 type=A zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:37:53Z" level=info msg="Changing record." action=UPDATE record=directus.brunopaz.dev targets=1 ttl=1 type=TXT zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:37:53Z" level=info msg="Changing record." action=UPDATE record=golang-api.brunopaz.dev targets=1 ttl=1 type=TXT zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:37:54Z" level=info msg="Changing record." action=UPDATE record=labs.brunopaz.dev targets=1 ttl=1 type=TXT zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:38:51Z" level=info msg="Changing record." action=UPDATE record=golang-api.brunopaz.dev targets=1 ttl=1 type=A zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:38:52Z" level=info msg="Changing record." action=UPDATE record=directus.brunopaz.dev targets=1 ttl=1 type=A zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:38:52Z" level=info msg="Changing record." action=UPDATE record=labs.brunopaz.dev targets=1 ttl=1 type=A zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:38:53Z" level=info msg="Changing record." action=UPDATE record=golang-api.brunopaz.dev targets=1 ttl=1 type=TXT zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:38:53Z" level=info msg="Changing record." action=UPDATE record=directus.brunopaz.dev targets=1 ttl=1 type=TXT zone=1bb86879fb7ea053bd1352c7a9b60ca2
time="2020-05-07T18:38:54Z" level=info msg="Changing record." action=UPDATE record=labs.brunopaz.dev targets=1 ttl=1 type=TXT zone=1bb86879fb7ea053bd1352c7a9b60ca2

This is an old issue. Please see all the discussion of #992. The problem is not fixed.

This issue can cause random major outages where the DNS cannot be resolved at all. I had outages of more than a day! fortunately in a personal cluster.

masterkain · 2020-05-27T21:06:28Z

The same is happening with the Cloudflare provider.
This is an old issue. Please see all the discussion of #992. The problem is not fixed.

This issue can cause random major outages where the DNS cannot be resolved at all. I had outages of more than a day! fortunately in a personal cluster.

correct, I had to revert back to route53 because of these outages in dns name resolution, not pleasant.

sheerun · 2020-06-04T11:38:02Z

This should be fixed in 0.7.2 at least for cloudflare provider, could you check?

stefanlasiewski · 2020-06-06T00:28:14Z

I will check hopefully next week.

JoaoBraveCoding · 2020-06-16T10:30:32Z

This is still broken for rfc2136 with CNAME records and provider openshift-routes

masterkain · 2020-06-16T10:42:54Z

seems solved with cloudflare for me

Elegant996 · 2020-06-19T10:05:06Z

Still having issues with CNAME records and cloudflare.

sheerun · 2020-06-27T18:02:27Z

@Elegant996 What version of external-dns are you using? Can you write a test to reproduce in cloudflare_test.go?

Elegant996 · 2020-06-27T18:41:25Z

Currently using 0.7.2, may be able to write something and associate it to a dummy service.

The worst part about this issue is cloudflare eventually ignored the CNAME. It appears that after being added a removed enough times, it just assumed the record to be non-existent and returned NXDOMAIN. The record had to be removed for a few hours and then manually added before it worked again.

stefanlasiewski · 2020-07-09T21:46:30Z

Hi folks, just to be clear, this ticket is in regards to the rfc2136 provider, not Cloudflare. For the Cloudflare bug, please see #992. While the behavior looks similar, I suspect the actual bug may be subtly different.

stefanlasiewski · 2020-07-09T23:18:21Z

So, for my rfc2136 what's happening now is that the DNS record itself has a TTL of 20 seconds, but external-dns thinks it should have a TTL of 0 seconds, which was the default until a recent update.

The same mismatch seems to happen for users that specify their own TTL with external-dns.alpha.kubernetes.io/ttl=60

The following record actually has a TTL of 20, but for some reason, external-dns thinks it is 0.

time="2020-07-09T23:02:48Zlevel=info msg="Removing RR: lb.project.example.org 0 A 10.10.10.100"
time="2020-07-09T23:02:48Z level=info msg="Adding RR: lb.project.example.org 20 A 10.10.10.100"
time="2020-07-09T23:02:49Z" level=info msg="Removing RR: lb.project.example.org 0 TXT \"heritage=external-dns,external-dns/owner=cluster-dev,external-dns/resource=ingress/project/lb\""
time="2020-07-09T23:02:49Z" level=info msg="Adding RR: lb.project.example.org 20 TXT \"heritage=external-dns,external-dns/owner=cluster-dev,external-dns/resource=ingress/project/lb\""

$  dig +noall +answer -t a lb.project.example.org
lb.project.example.org. 20 IN A 10.10.10.100

stefanlasiewski · 2020-07-16T20:52:45Z

Here's an updated log containing the debug messages for this server:

time="2020-07-16T20:47:10Z" level=debug msg="Record=web.service.example.org.\t20\tIN\tA\t192.168.100.100"
time="2020-07-16T20:47:10Z" level=debug msg="Record=web.service.example.org.\t20\tIN\tA\t192.168.100.101"
time="2020-07-16T20:47:10Z" level=debug msg="Record=web.service.example.org.\t20\tIN\tTXT\t\"heritage=external-dns,external-dns/ownertag,external-dns/resource=ingress/namespace1/workload1\""
time="2020-07-16T20:47:10Z" level=debug msg="Record=web.service.example.org.\t20\tIN\tRRSIG\tTXT 8 7 20 20200824185808 20200709215244 34551 service.example.org. big-l
ong-key=="
time="2020-07-16T20:47:10Z" level=debug msg="Record=web.service.example.org.\t20\tIN\tRRSIG\tA 8 7 20 20200830034531 20200716194208 34551 service.example.org. big-lon
g-key=="
time="2020-07-16T20:47:10Z" level=debug msg="Endpoints generated from ingress: namespace1/workload1: [web.service.example.org 20 IN A  192.168.100.100 []]"
time="2020-07-16T20:47:10Z" level=debug msg="RemoveRecord.ep=web.service.example.org 20 IN A  192.168.100.100 []"
time="2020-07-16T20:47:10Z" level=info msg="Removing RR: web.service.example.org 20 A 192.168.100.100"
time="2020-07-16T20:47:10Z" level=debug msg="AddRecord.ep=web.service.example.org 20 IN A  192.168.100.100 []"
time="2020-07-16T20:47:10Z" level=info msg="Adding RR: web.service.example.org 20 A 192.168.100.100"
time="2020-07-16T20:47:10Z" level=debug msg="RemoveRecord.ep=web.service.example.org 0 IN TXT  \"heritage=external-dns,external-dns/ownertag,external-dns/resource=ingress/namespace1/workload1\" []"
time="2020-07-16T20:47:10Z" level=info msg="Removing RR: web.service.example.org 0 TXT \"heritage=external-dns,external-dns/ownertag,external-dns/resource=ingress/namespace1/workload1\""
time="2020-07-16T20:47:10Z" level=debug msg="AddRecord.ep=web.service.example.org 0 IN TXT  \"heritage=external-dns,external-dns/ownertag,external-dns/resource=ingress/namespace1/workload1\" []"
time="2020-07-16T20:47:10Z" level=info msg="Adding RR: web.service.example.org 20 TXT \"heritage=external-dns,external-dns/ownertag,external-dns/resource=ingress/namespace1/workload1\""

stefanlasiewski · 2020-07-16T21:14:35Z

I see that our DNS servers return two IPs in this record (.100 and .101), whereas external-dns tries to update one (.100) only.

k8s-ci-robot · 2020-07-16T21:35:31Z

@stefanlasiewski: The label(s) /label provider/rfc2136 cannot be applied. These labels are supported: api-review, community/discussion, community/maintenance, community/question, cuj/build-train-deploy, cuj/multi-user, platform/aws, platform/azure, platform/gcp, platform/minikube, platform/other, tide/merge-method-merge, tide/merge-method-rebase, tide/merge-method-squash

In response to this:

/label provider/rfc2136

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

stefanlasiewski · 2020-07-16T22:08:53Z

After talking to @tdyas, it seems that #1595 (for Digitalocean) might be the fix for this as well. Unfortunately, I will have trouble commiting a PR because I'm having trouble with the CNCF CLA.

Code is detailed here:

https://github.com/kubernetes-sigs/external-dns/blame/7505f29e4cec80ca20468b38c03b660a8481277d/provider/digitalocean/digital_ocean.go#L116-L145

stefanlasiewski · 2020-07-16T23:22:01Z

I believe this bug only affects records that have two IP addresses, and it appears that the rfc2136 provider has trouble reconciling those two records, and therefore it loops every interval (--interval=1m)

fejta-bot · 2020-10-14T23:35:26Z

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seanmalloy · 2020-10-15T03:17:09Z

/remove-lifecycle stale

fejta-bot · 2021-01-13T03:49:49Z

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

seanmalloy · 2021-01-13T15:53:46Z

/remove-lifecycle stale

fejta-bot · 2021-04-13T15:55:04Z

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Send feedback to sig-contributor-experience at kubernetes/community.
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stefanlasiewski · 2021-04-16T17:29:35Z

This isn't affecting us any more as far as I can tell. I'll go ahead and close this issue.

stefanlasiewski added the kind/bug Categorizes issue or PR as related to a bug. label May 23, 2020

stefanlasiewski changed the title ~~rfc2136 continually removing then adding~~ rfc2136 continually removing then adding A records May 24, 2020

stefanlasiewski mentioned this issue May 25, 2020

External-DNS delete and recreate constantly all DNS records #992

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stefanlasiewski mentioned this issue Jul 16, 2020

Multi target support and bugfixes for rfc2136 provider #1431

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stefanlasiewski changed the title ~~rfc2136 continually removing then adding A records~~ rfc2136 continually removing then adding A records that have more than 1 target Jul 16, 2020

tdyas mentioned this issue Jul 17, 2020

rfc2136: merge endpoints with same name/type into single endpoint #1678

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k8s-ci-robot added the lifecycle/stale Denotes an issue or PR has remained open with no activity and has become stale. label Oct 14, 2020

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stefanlasiewski closed this as completed Apr 16, 2021

bogdando mentioned this issue Jul 15, 2024

rfc2136: merge Endpoints with same name/type into single Endpoint #4613

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rfc2136 continually removing then adding A records that have more than 1 target #1596

rfc2136 continually removing then adding A records that have more than 1 target #1596

stefanlasiewski commented May 23, 2020 •

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masterkain commented May 27, 2020

sheerun commented Jun 4, 2020

stefanlasiewski commented Jun 6, 2020

JoaoBraveCoding commented Jun 16, 2020

masterkain commented Jun 16, 2020

Elegant996 commented Jun 19, 2020

sheerun commented Jun 27, 2020

Elegant996 commented Jun 27, 2020

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stefanlasiewski commented Apr 16, 2021

rfc2136 continually removing then adding A records that have more than 1 target #1596

rfc2136 continually removing then adding A records that have more than 1 target #1596

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