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Allow the DNS stack to be backward compatible with an old dns_domain #10630

Merged
merged 1 commit into from
Jan 24, 2024
Merged

Allow the DNS stack to be backward compatible with an old dns_domain #10630

merged 1 commit into from
Jan 24, 2024

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VannTen
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@VannTen VannTen commented Nov 20, 2023 •
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What type of PR is this?
/kind feature

What this PR does / why we need it:

All domains in old_dns_domains are handled by nodelocaldns in the same server block
as the current dns_domain, while coredns performs a suffix rewrite of
each of the old dns domains to the current one.

This facilitates changing your dns_domain, for whatever reason, especially if some of your users/workloads embed the cluster dns_domain in their config.
(they should'nt, but they will)

Does this PR introduce a user-facing change?:

The variable `old_dns_domains` (list) can be used for backward compatibility when changing `dns_domain`

@k8s-ci-robot k8s-ci-robot added kind/feature Categorizes issue or PR as related to a new feature. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. labels Nov 20, 2023
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Hi @VannTen. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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@k8s-ci-robot k8s-ci-robot added the size/S Denotes a PR that changes 10-29 lines, ignoring generated files. label Nov 20, 2023
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VannTen commented Nov 20, 2023 •
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/retest
Look like the runner are in trouble.

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@VannTen: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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.

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yankay commented Nov 21, 2023

/ok-to-test

@k8s-ci-robot k8s-ci-robot added ok-to-test Indicates a non-member PR verified by an org member that is safe to test. and removed needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. labels Nov 21, 2023
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VannTen commented Nov 21, 2023

/retest

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VannTen commented Nov 21, 2023

Looks like /retest does not work. Not sure if it's prow not picking it up or the CI in disarray. @floryut not sure if you can re-trigger it ?

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yankay commented Nov 23, 2023

Looks like /retest does not work. Not sure if it's prow not picking it up or the CI in disarray. @floryut not sure if you can re-trigger it ?

Thanks @VannTen

The CI has been repaired, would you please repush it to trige the CI agiain :-)

@VannTen
Allow the DNS stack to be backward compatible with an old dns_domain
9ef25c4 
Handle all old dns domains:
- for nodelocaldns: in the same server block as the current dns_domain
- for coredns: uffix rewrite of each of the old dns domains to the
  current one
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VannTen commented Dec 4, 2023

By the way, I tried to use #10045 before doing this, but it does not work with nodelocaldns, because dns queries outside of the cluster dns_domain are routed to upstream nameservers, and so never reach Coredns to be rewritten (also, the rewrite_block is not actually the block, since you need to manually specifiy rewrite and could instead put any plugin configuration here...

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VannTen commented Dec 18, 2023

@cristicalin @liupeng0518 Any idea when you'll get a chance to look at this ?

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VannTen commented Jan 22, 2024

/cc @MrFreezeex @mzaian
/uncc @cristicalin @liupeng0518

@k8s-ci-robot k8s-ci-robot requested review from MrFreezeex and mzaian and removed request for cristicalin and liupeng0518 January 22, 2024 15:39
MrFreezeex
MrFreezeex approved these changes Jan 22, 2024
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Ohh that's pretty nice, I think this use case come somewhat pretty often so 👍
/lgtm

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Jan 22, 2024
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VannTen commented Jan 23, 2024

/assign @yankay @floryut
(approval)

VannTen
VannTen commented Jan 23, 2024
View reviewed changes
roles/kubernetes-apps/ansible/templates/coredns-config.yml.j2
@@ -49,6 +49,9 @@ data:
{% if coredns_rewrite_block is defined %}
{{ coredns_rewrite_block | indent(width=8, first=False) }}
{% endif %}
{% for old_dns_domain in old_dns_domains %}
rewrite name suffix {{ old_dns_domain }} {{ dns_domain }} answer auto
{% endfor %}
ready
kubernetes {{ dns_domain }} {% if coredns_kubernetes_extra_domains is defined %}{{ coredns_kubernetes_extra_domains }} {% endif %}{% if enable_coredns_reverse_dns_lookups %}in-addr.arpa ip6.arpa {% endif %}{
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Hum.
Looking at that just now I wonder if I should instead extend coredns_kubernetes_extra_domains (I don't think that setting can work currently since nodelocaldns won't forward it to coredns)

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yankay commented Jan 24, 2024

Thanks @VannTen
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MrFreezeex, VannTen, yankay

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@k8s-ci-robot k8s-ci-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Jan 24, 2024
@k8s-ci-robot k8s-ci-robot merged commit c80f2cd into kubernetes-sigs:master Jan 24, 2024
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@mzaian mzaian mentioned this pull request Apr 26, 2024
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pedro-peter pushed a commit to pedro-peter/kubespray that referenced this pull request May 8, 2024
@VannTen @pedromcpedro
Allow the DNS stack to be backward compatible with an old dns_domain (k…
32aa7f1 
…ubernetes-sigs#10630)

Handle all old dns domains:
- for nodelocaldns: in the same server block as the current dns_domain
- for coredns: uffix rewrite of each of the old dns domains to the
  current one
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