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Update documentation on CoreDNS (#10923)

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* update documentation on CoreDNS

* Update dns-custom-nameservers.md

Fixed nit noted in comments and cleaned up a few more things while I was in there. This whole topic needs a complete redo, but this PR is an iterative improvment. Thanks!
This commit is contained in:
Sandeep Rajan
2018-11-16 15:35:38 -05:00
committed by k8s-ci-robot
parent 2bfdd42aa7
commit 6f3b8cbd9b
5 changed files with 18 additions and 12 deletions
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content/en/docs/tasks/administer-cluster/coredns.md
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@@ -63,6 +63,11 @@ value to `false`:
kubeadm init --feature-gates=CoreDNS=false
```
## Tuning CoreDNS
When resource utilisation is a concern, it may be useful to tune the configuration of CoreDNS. For more details, check out the
[documentation on scaling CoreDNS]((https://github.com/coredns/deployment/blob/master/kubernetes/Scaling_CoreDNS.md)).
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content/en/docs/tasks/administer-cluster/dns-custom-nameservers.md
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@@ -103,10 +103,10 @@ The Corefile configuration includes the following [plugins](https://coredns.io/p
* [proxy](https://coredns.io/plugins/proxy/): Any queries that are not within the cluster domain of Kubernetes will be forwarded to predefined resolvers (/etc/resolv.conf).
* [cache](https://coredns.io/plugins/cache/): This enables a frontend cache.
* [loop](https://coredns.io/plugins/loop/): Detects simple forwarding loops and halts the CoreDNS process if a loop is found.
* [reload](https://coredns.io/plugins/reload): Allows automatic reload of a changed Corefile.
* [loadbalance](https://coredns.io/plugins/loadbalance): This is a round-robin DNS loadbalancer by randomizing the order of A, AAAA, and MX records in the answer.
* [reload](https://coredns.io/plugins/reload): Allows automatic reload of a changed Corefile. After you edit the ConfigMap configuration, allow two minutes for your changes to take effect.
* [loadbalance](https://coredns.io/plugins/loadbalance): This is a round-robin DNS loadbalancer that randomizes the order of A, AAAA, and MX records in the answer.
We can modify the default behavior by modifying this configmap.
You can modify the default CoreDNS behavior by modifying the ConfigMap.
### Configuration of Stub-domain and upstream nameserver using CoreDNS
@@ -132,7 +132,7 @@ proxy . 172.16.0.1
upstream 172.16.0.1
```
So, the final ConfigMap along with the default `Corefile` configuration will look like:
The final ConfigMap along with the default `Corefile` configuration looks like:
```yaml
apiVersion: v1
@@ -307,9 +307,9 @@ data:
## CoreDNS configuration equivalent to kube-dns
CoreDNS supports all the functionalities and more that is provided by kube-dns.
CoreDNS supports the features of kube-dns and more.
A ConfigMap created for kube-dns to support `StubDomains`and `upstreamNameservers` translates to the `proxy` plugin in CoreDNS.
Similarly, the `Federation` plugin translates to the `federation` plugin in CoreDNS.
Similarly, the `Federations` plugin in kube-dns translates to the `federation` plugin in CoreDNS.
### Example
@@ -380,12 +380,10 @@ The complete Corefile with the default plugins:
}
```
In Kubernetes version 1.10 and later, kubeadm supports automatic translation of the CoreDNS ConfigMap from the kube-dns ConfigMap.
## Migration to CoreDNS
To migrate from kube-dns to CoreDNS, [a detailed blog](https://coredns.io/2018/05/21/migration-from-kube-dns-to-coredns/) is available to help users adapt CoreDNS in place of kube-dns.
A cluster administrator can also migrate using [the deploy script](https://github.com/coredns/deployment/blob/master/kubernetes/deploy.sh), which will also help you translate the kube-dns configmap to the equivalent CoreDNS one.
A cluster administrator can also migrate using [the deploy script](https://github.com/coredns/deployment/blob/master/kubernetes/deploy.sh).
## What's next
- [Debugging DNS Resolution](/docs/tasks/administer-cluster/dns-debugging-resolution/).