skydns to kubedns rename documentation changes
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Andrew Chen
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965dfd948a
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0e294acc78
@@ -217,10 +217,7 @@ Kube-dns is an addon for Kubernetes which adds DNS-based service discovery to th
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The kube-dns addon runs as a pod inside the cluster. The pod consists of three co-located containers:
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- a local etcd instance
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- the [skydns][11] DNS server
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- the kube2sky process to glue skydns to the state of the Kubernetes cluster.
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The skydns container offers DNS service via port 53 to the cluster. The etcd communication works via local 127.0.0.1 communication
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- the [kube-dns][11] DNS server
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We assume that kube-dns will use
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@@ -229,13 +226,13 @@ We assume that kube-dns will use
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Note that we have passed these two values already as parameter to the apiserver above.
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A template for a replication controller spinning up the pod with the 3 containers can be found at [cluster/addons/dns/skydns-rc.yaml.in][11] in the repository. The following steps are necessary in order to get a valid replication controller yaml file:
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A template for a replication controller spinning up the pod with the 3 containers can be found at [cluster/addons/dns/kubedns-controller.yaml.in][12] in the repository. The following steps are necessary in order to get a valid replication controller yaml file:
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- replace `{% raw %}{{ pillar['dns_replicas'] }}{% endraw %}` with `1`
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- replace `{% raw %}{{ pillar['dns_domain'] }}{% endraw %}` with `cluster.local.`
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- add `--kube_master_url=${KUBERNETES_MASTER}` parameter to the kube2sky container command.
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In addition the service template at [cluster/addons/dns/skydns-svc.yaml.in][12] needs the following replacement:
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In addition the service template at [cluster/addons/dns/kubedns-controller.yaml.in][12] needs the following replacement:
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- `{% raw %}{{ pillar['dns_server'] }}{% endraw %}` with `10.10.10.10`.
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@@ -245,16 +242,16 @@ To do this automatically:
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sed -e "s/{{ pillar\['dns_replicas'\] }}/1/g;"\
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"s,\(command = \"/kube2sky\"\),\\1\\"$'\n'" - --kube_master_url=${KUBERNETES_MASTER},;"\
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"s/{{ pillar\['dns_domain'\] }}/cluster.local/g" \
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cluster/addons/dns/skydns-rc.yaml.in > skydns-rc.yaml
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cluster/addons/dns/kubedns-controller.yaml.in > kubedns-controller.yaml
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sed -e "s/{{ pillar\['dns_server'\] }}/10.10.10.10/g" \
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cluster/addons/dns/skydns-svc.yaml.in > skydns-svc.yaml{% endraw %}
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cluster/addons/dns/kubedns-svc.yaml.in > kubedns-svc.yaml
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```
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Now the kube-dns pod and service are ready to be launched:
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```shell
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kubectl create -f ./skydns-rc.yaml
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kubectl create -f ./skydns-svc.yaml
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kubectl create -f ./kubedns-controller.yaml
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kubectl create -f ./kubedns-svc.yaml
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```
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Check with `kubectl get pods --namespace=kube-system` that 3/3 containers of the pods are eventually up and running. Note that the kube-dns pods run in the `kube-system` namespace, not in `default`.
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@@ -335,6 +332,6 @@ Future work will add instructions to this guide to enable support for Kubernetes
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[8]: https://github.com/mesosphere/kubernetes-mesos/issues
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[9]: https://github.com/kubernetes/kubernetes/tree/{{page.githubbranch}}/examples
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[10]: http://open.mesosphere.com/getting-started/cloud/google/mesosphere/#vpn-setup
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[11]: https://releases.k8s.io/{{page.githubbranch}}/cluster/addons/dns/skydns-rc.yaml.in
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[12]: https://releases.k8s.io/{{page.githubbranch}}/cluster/addons/dns/skydns-svc.yaml.in
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[11]: https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/dns/README.md#kube-dns
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[12]: https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/dns/kubedns-controller.yaml.in
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[13]: https://github.com/kubernetes-incubator/kube-mesos-framework/blob/master/README.md
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