DNS resolution randomly stops working for website

[brunopaz]

Hello. I using Cloudflare as DNS provider for some personal websites, but I am having some random issues with DNS Resolution.

Some times, DNS just stops working and when it happens it can be like a couple of minutes of dowtime to almost entire days.

It also happens that I have 2 subdomains, pointing to exactly the same IP, one of them resolves the other dont.

Here is the screenshot from my cloudflare account:

If I run dig, the results is the following:

 ❯ dig labs.brunopaz.dev                                                                                                                                                

; <<>> DiG 9.11.14-RedHat-9.11.14-2.fc30 <<>> labs.brunopaz.dev
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 57640
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;labs.brunopaz.dev.		IN	A

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: qui mai 07 18:44:06 WEST 2020
;; MSG SIZE  rcvd: 46

No IP address defined, despite it appearing correctly configured on Cloudflare interface.

Also my websites are up. I can reach them internally from my cluster.

Any ideas what is happening?

[sdayman]

I can confirm that ‘labs’ is not resolving. Only ‘directus’ resolves. Are the two name servers on that DNS page Kanye and Marge?

[brunopaz]

Yes. they are.

I dont know but both websites are deployed in a Kubernetes Cluster and I using External DNS to automatically update the IP address in Cloudflare if changed.

Right now, it seems to exist a bug on External DNS that makes do a lot of Delete/Insert requests every minute of DNS records for the same domain, even when the IP has not changed. - https://github.com/kubernetes-sigs/external-dns/issues/992

Do you think this can somehow confuse Cloudflare or hitting some kind of rate limit? The fact is that the IP hasn´t changed and it appears correct on Cloudflare interface.

[sdayman]

Based on everything in this thread, it should work. Open a Support Ticket and include a link to this thread.

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