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Fix small typo NodeLocal DNSCache doc

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Brandon Doran
2020-05-09 11:07:39 -07:00
parent 22d2069bc0
commit 5f844149d4
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content/en/docs/tasks/administer-cluster/nodelocaldns.md
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@@ -32,7 +32,7 @@ Having a local cache will help improve the latency in such scenarios.
* Skipping iptables DNAT and connection tracking will help reduce [conntrack races](https://github.com/kubernetes/kubernetes/issues/56903) and avoid UDP DNS entries filling up conntrack table.
* Connections from local caching agent to kube-dns servie can be upgraded to TCP. TCP conntrack entries will be removed on connection close in contrast with UDP entries that have to timeout ([default](https://www.kernel.org/doc/Documentation/networking/nf_conntrack-sysctl.txt) `nf_conntrack_udp_timeout` is 30 seconds)
* Connections from local caching agent to kube-dns service can be upgraded to TCP. TCP conntrack entries will be removed on connection close in contrast with UDP entries that have to timeout ([default](https://www.kernel.org/doc/Documentation/networking/nf_conntrack-sysctl.txt) `nf_conntrack_udp_timeout` is 30 seconds)
* Upgrading DNS queries from UDP to TCP would reduce tail latency attributed to dropped UDP packets and DNS timeouts usually up to 30s (3 retries + 10s timeout). Since the nodelocal cache listens for UDP DNS queries, applications don't need to be changed.