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Merge pull request #10829 from ZJU-SEL/adddns2docker
add kube-dns for docker k8s
This commit is contained in:
Robert Bailey
commit
f94f6c48fd
@ -48,6 +48,7 @@ Please install Docker 1.6.2 or Docker 1.7.1.
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- [Bootstrap Docker](#bootstrap-docker)
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- [Master Node](#master-node)
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- [Adding a worker node](#adding-a-worker-node)
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- [Deploy a DNS](#deploy-a-dns)
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- [Testing your cluster](#testing-your-cluster)
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## Prerequisites
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@ -106,6 +107,10 @@ cd kubernetes/docs/getting-started-guides/docker-multinode/
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See [here](docker-multinode/worker.md) for detailed instructions explanation.
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## Deploy a DNS
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See [here](docker-multinode/deployDNS.md) for instructions.
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## Testing your cluster
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Once your cluster has been created you can [test it out](docker-multinode/testing.md)
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85
docs/getting-started-guides/docker-multinode/deployDNS.md
Normal file
85
docs/getting-started-guides/docker-multinode/deployDNS.md
Normal file
@ -0,0 +1,85 @@
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<!-- BEGIN MUNGE: UNVERSIONED_WARNING -->
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<!-- BEGIN STRIP_FOR_RELEASE -->
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<h2>PLEASE NOTE: This document applies to the HEAD of the source tree</h2>
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If you are using a released version of Kubernetes, you should
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refer to the docs that go with that version.
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<strong>
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The latest 1.0.x release of this document can be found
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[here](http://releases.k8s.io/release-1.0/docs/getting-started-guides/docker-multinode/deployDNS.md).
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Documentation for other releases can be found at
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[releases.k8s.io](http://releases.k8s.io).
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</strong>
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--
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<!-- END STRIP_FOR_RELEASE -->
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<!-- END MUNGE: UNVERSIONED_WARNING -->
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## Deploy DNS
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### Get the template file
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First of all, download the template dns rc and svc file from
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[skydns-rc template](skydns-rc.yaml.in)
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[skydns-svc template](skydns-svc.yaml.in)
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### Set env
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Then you need to set `DNS_REPLICAS` , `DNS_DOMAIN` , `DNS_SERVER_IP` , `KUBE_SERVER` ENV.
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```
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$ export DNS_REPLICAS=1
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$ export DNS_DOMAIN=cluster.local # specify in startup parameter `--cluster-domain` for containerized kubelet
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$ export DNS_SERVER_IP=10.0.0.10 # specify in startup parameter `--cluster-dns` for containerized kubelet
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$ export KUBE_SERVER=10.10.103.250 # your master server ip, you may change it
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```
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### Replace the correponding value in the template.
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```
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$ sed -e "s/{{ pillar\['dns_replicas'\] }}/${DNS_REPLICAS}/g;s/{{ pillar\['dns_domain'\] }}/${DNS_DOMAIN}/g;s/{kube_server_url}/${KUBE_SERVER}/g;" skydns-rc.yaml.in > ./skydns-rc.yaml
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$ sed -e "s/{{ pillar\['dns_server'\] }}/${DNS_SERVER_IP}/g" skydns-svc.yaml.in > ./skydns-svc.yaml
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```
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### Use `kubectl` to create skydns rc and service
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```
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$ kubectl -s "$KUBE_SERVER:8080" --namespace=kube-system create -f ./skydns-rc.yaml
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$ kubectl -s "$KUBE_SERVER:8080" --namespace=kube-system create -f ./skydns-svc.yaml
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```
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### Test if DNS works
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Follow [this link](../../../cluster/addons/dns/#how-do-i-test-if-it-is-working) to check it out.
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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[]()
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<!-- END MUNGE: GENERATED_ANALYTICS -->
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@ -160,9 +160,11 @@ systemctl start docker
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Ok, now that your networking is set up, you can startup Kubernetes, this is the same as the single-node case, we will use the "main" instance of the Docker daemon for the Kubernetes components.
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```sh
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sudo docker run --net=host -d -v /var/run/docker.sock:/var/run/docker.sock gcr.io/google_containers/hyperkube:v0.21.2 /hyperkube kubelet --api-servers=http://localhost:8080 --v=2 --address=0.0.0.0 --enable-server --hostname-override=127.0.0.1 --config=/etc/kubernetes/manifests-multi
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sudo docker run --net=host -d -v /var/run/docker.sock:/var/run/docker.sock gcr.io/google_containers/hyperkube:v1.0.1 /hyperkube kubelet --api-servers=http://localhost:8080 --v=2 --address=0.0.0.0 --enable-server --hostname-override=127.0.0.1 --config=/etc/kubernetes/manifests-multi --cluster-dns=10.0.0.10 --cluster-domain=cluster.local
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```
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> Note that `--cluster-dns` and `--cluster-domain` is used to deploy dns, feel free to discard them if dns is not needed.
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### Also run the service proxy
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```sh
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@ -196,7 +198,7 @@ If all else fails, ask questions on IRC at [#google-containers](http://webchat.f
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### Next steps
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Move on to [adding one or more workers](worker.md)
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Move on to [adding one or more workers](worker.md) or [deploy a dns](deployDNS.md)
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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@ -135,7 +135,7 @@ start_k8s(){
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sleep 5
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# Start kubelet & proxy, then start master components as pods
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docker run --net=host --privileged --restart=always -d -v /sys:/sys:ro -v /var/run/docker.sock:/var/run/docker.sock gcr.io/google_containers/hyperkube:v${K8S_VERSION} /hyperkube kubelet --api-servers=http://localhost:8080 --v=2 --address=0.0.0.0 --enable-server --hostname-override=127.0.0.1 --config=/etc/kubernetes/manifests-multi
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docker run --net=host --privileged --restart=always -d -v /sys:/sys:ro -v /var/run/docker.sock:/var/run/docker.sock gcr.io/google_containers/hyperkube:v${K8S_VERSION} /hyperkube kubelet --api-servers=http://localhost:8080 --v=2 --address=0.0.0.0 --enable-server --hostname-override=127.0.0.1 --config=/etc/kubernetes/manifests-multi --cluster-dns=10.0.0.10 --cluster-domain=cluster.local
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docker run -d --net=host --privileged gcr.io/google_containers/hyperkube:v${K8S_VERSION} /hyperkube proxy --master=http://127.0.0.1:8080 --v=2
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}
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@ -0,0 +1,92 @@
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apiVersion: v1
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kind: ReplicationController
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metadata:
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name: kube-dns-v8
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namespace: kube-system
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labels:
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k8s-app: kube-dns
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version: v8
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kubernetes.io/cluster-service: "true"
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spec:
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replicas: {{ pillar['dns_replicas'] }}
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selector:
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k8s-app: kube-dns
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version: v8
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template:
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metadata:
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labels:
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k8s-app: kube-dns
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version: v8
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kubernetes.io/cluster-service: "true"
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spec:
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containers:
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- name: etcd
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image: gcr.io/google_containers/etcd:2.0.9
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resources:
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limits:
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cpu: 100m
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memory: 50Mi
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command:
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- /usr/local/bin/etcd
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- -data-dir
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- /var/etcd/data
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- -listen-client-urls
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- http://127.0.0.1:2379,http://127.0.0.1:4001
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- -advertise-client-urls
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- http://127.0.0.1:2379,http://127.0.0.1:4001
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- -initial-cluster-token
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- skydns-etcd
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volumeMounts:
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- name: etcd-storage
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mountPath: /var/etcd/data
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- name: kube2sky
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image: gcr.io/google_containers/kube2sky:1.11
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resources:
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limits:
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cpu: 100m
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memory: 50Mi
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args:
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# command = "/kube2sky"
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- -domain={{ pillar['dns_domain'] }}
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- -kube_master_url=http://{kube_server_url}:8080
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- name: skydns
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image: gcr.io/google_containers/skydns:2015-03-11-001
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resources:
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limits:
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cpu: 100m
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memory: 50Mi
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args:
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# command = "/skydns"
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- -machines=http://localhost:4001
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- -addr=0.0.0.0:53
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- -domain={{ pillar['dns_domain'] }}.
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ports:
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- containerPort: 53
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name: dns
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protocol: UDP
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- containerPort: 53
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name: dns-tcp
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protocol: TCP
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livenessProbe:
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httpGet:
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path: /healthz
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port: 8080
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scheme: HTTP
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initialDelaySeconds: 30
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timeoutSeconds: 5
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- name: healthz
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image: gcr.io/google_containers/exechealthz:1.0
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resources:
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limits:
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cpu: 10m
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memory: 20Mi
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args:
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- -cmd=nslookup kubernetes.default.svc.{{ pillar['dns_domain'] }} localhost >/dev/null
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- -port=8080
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ports:
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- containerPort: 8080
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protocol: TCP
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volumes:
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- name: etcd-storage
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emptyDir: {}
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dnsPolicy: Default # Don't use cluster DNS.
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@ -0,0 +1,20 @@
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apiVersion: v1
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kind: Service
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metadata:
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name: kube-dns
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namespace: kube-system
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labels:
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k8s-app: kube-dns
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kubernetes.io/cluster-service: "true"
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kubernetes.io/name: "KubeDNS"
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spec:
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selector:
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k8s-app: kube-dns
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clusterIP: {{ pillar['dns_server'] }}
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ports:
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- name: dns
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port: 53
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protocol: UDP
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- name: dns-tcp
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port: 53
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protocol: TCP
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@ -146,7 +146,7 @@ systemctl start docker
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Again this is similar to the above, but the `--api-servers` now points to the master we set up in the beginning.
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```sh
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sudo docker run --net=host -d -v /var/run/docker.sock:/var/run/docker.sock gcr.io/google_containers/hyperkube:v0.21.2 /hyperkube kubelet --api-servers=http://${MASTER_IP}:8080 --v=2 --address=0.0.0.0 --enable-server --hostname-override=$(hostname -i)
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sudo docker run --net=host -d -v /var/run/docker.sock:/var/run/docker.sock gcr.io/google_containers/hyperkube:v1.0.1 /hyperkube kubelet --api-servers=http://${MASTER_IP}:8080 --v=2 --address=0.0.0.0 --enable-server --hostname-override=$(hostname -i) --cluster-dns=10.0.0.10 --cluster-domain=cluster.local
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```
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#### Run the service proxy
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@ -133,9 +133,8 @@ start_k8s() {
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sleep 5
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# Start kubelet & proxy in container
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sudo docker run --net=host --privileged --restart=always -d -v /sys:/sys:ro -v /var/run/docker.sock:/var/run/docker.sock gcr.io/google_containers/hyperkube:v${K8S_VERSION} /hyperkube kubelet --api-servers=http://${MASTER_IP}:8080 --v=2 --address=0.0.0.0 --enable-server --hostname-override=$(hostname -i)
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sudo docker run --net=host --privileged --restart=always -d -v /sys:/sys:ro -v /var/run/docker.sock:/var/run/docker.sock gcr.io/google_containers/hyperkube:v${K8S_VERSION} /hyperkube kubelet --api-servers=http://${MASTER_IP}:8080 --v=2 --address=0.0.0.0 --enable-server --hostname-override=$(hostname -i) --cluster-dns=10.0.0.10 --cluster-domain=cluster.local
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sudo docker run -d --net=host --privileged --restart=always gcr.io/google_containers/hyperkube:v${K8S_VERSION} /hyperkube proxy --master=http://${MASTER_IP}:8080 --v=2
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}
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echo "Detecting your OS distro ..."
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