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Add support for running a nodelocal dns cache (#3861)

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* Add support for running a nodelocal dns cache

After encountering dns issues in a cluster I was recently working on I
noticed Kubernetes 1.13 introduced support for running a nodelocal dns
cache.

I believe this can usefull for more people.

https://github.com/kubernetes/kubernetes/commit/73b548db06c5e293533344c5b6171e955eac9ff1
https://github.com/kubernetes/enhancements/blob/master/keps/sig-network/0030-nodelocal-dns-cache.md

* Add requested changes

* Add additional requested changes + documentation

* Add requested changes after review

* Replace incorrect variable
This commit is contained in:
Thomas Nys
2018-12-11 02:28:03 +01:00
committed by Kubernetes Prow Robot
parent 7b674e0607
commit 3e3ee0aeb1
12 changed files with 223 additions and 0 deletions
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docs/dns-stack.md
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@@ -84,6 +84,11 @@ leaves you with a non functional cluster.
``resolvconf_mode`` configures how Kubespray will setup DNS for ``hostNetwork: true`` PODs and non-k8s containers.
There are three modes available:
## Nodelocal DNS cache
Setting ``enable_nodelocaldns`` to ``true`` will make pods reach out to the dns (core-dns) caching agent running on the same node, thereby avoiding iptables DNAT rules and connection tracking. The local caching agent will query kube-dns / core-dns (depending on what main DNS plugin is configured in your cluster) for cache misses of cluster hostnames(cluster.local suffix by default).
More information on the rationale behind this implementation can be found [here](https://github.com/kubernetes/enhancements/blob/master/keps/sig-network/0030-nodelocal-dns-cache.md).
#### docker_dns (default)
This sets up the docker daemon with additional --dns/--dns-search/--dns-opt flags.