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Merge pull request #53604 from cblecker/no-negcache

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Automatic merge from submit-queue (batch tested with PRs 53604, 53751). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Add no-negcache flag to kube-dns

**What this PR does / why we need it**:
Adds the [`--no-negcache`](https://linux.die.net/man/8/dnsmasq) flag to prevent dnsmasq from caching negative (NXDOMAIN) responses. More details on why this is desirable [here](https://github.com/kubernetes/dns/issues/121).

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes kubernetes/dns#121

**Special notes for your reviewer**:
Thanks to @rsmitty (https://rsmitty.github.io/KubeDNS-Tweaks/) and @coresolve (https://github.com/kubernetes/dns/issues/121#issuecomment-334045196) for pointing us in the right direction.

**Release note**:
```release-note
Add --no-negcache flag to kube-dns to prevent caching of NXDOMAIN responses.
```
This commit is contained in:
Kubernetes Submit Queue 2017-10-13 15:26:40 -07:00 committed by GitHub
commit 141aa462fa
4 changed files with 4 additions and 0 deletions
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1
cluster/addons/dns/kube-dns.yaml.base
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@ -163,6 +163,7 @@ spec:
- --
- -k
- --cache-size=1000
- --no-negcache
- --log-facility=-
- --server=/__PILLAR__DNS__DOMAIN__/127.0.0.1#10053
- --server=/in-addr.arpa/127.0.0.1#10053

1
cluster/addons/dns/kube-dns.yaml.in
View File

@ -163,6 +163,7 @@ spec:
- --
- -k
- --cache-size=1000
- --no-negcache
- --log-facility=-
- --server=/{{ pillar['dns_domain'] }}/127.0.0.1#10053
- --server=/in-addr.arpa/127.0.0.1#10053

1
cluster/addons/dns/kube-dns.yaml.sed
View File

@ -163,6 +163,7 @@ spec:
- --
- -k
- --cache-size=1000
- --no-negcache
- --log-facility=-
- --server=/$DNS_DOMAIN/127.0.0.1#10053
- --server=/in-addr.arpa/127.0.0.1#10053

1
cmd/kubeadm/app/phases/addons/dns/manifests.go
View File

@ -121,6 +121,7 @@ spec:
- --
- -k
- --cache-size=1000
- --no-negcache
- --log-facility=-
- --server=/{{ .DNSDomain }}/127.0.0.1#10053
- --server=/in-addr.arpa/127.0.0.1#10053