github/kubernetes
1
0
Fork 0
mirror of https://github.com/k3s-io/kubernetes.git synced 2025-07-29 14:37:00 +00:00
Code Issues Projects Releases Wiki Activity

Fix DNS example due to default DNS domain rename

Browse Source
This commit is contained in:
Deyuan Deng 2015-06-10 16:58:43 -04:00
parent f62a2a1bb6
commit 59a1c6e0b4
2 changed files with 10 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
examples/cluster-dns/README.md
View File

@ -37,6 +37,8 @@ $ kubectl config set-context dev --namespace=development --cluster=${CLUSTER_NAM
$ kubectl config set-context prod --namespace=production --cluster=${CLUSTER_NAME} --user=${USER_NAME}
```
You can view your cluster name and user name in kubernetes config at ~/.kube/config.
### Step Two: Create backend replication controller in each namespace
Use the file [`examples/cluster-dns/dns-backend-rc.yaml`](dns-backend-rc.yaml) to create a backend server [replication controller](../../docs/replication-controller.md) in each namespace.
@ -94,7 +96,7 @@ dns-backend <none> name=dns-backend 10.0.35.246 8000/TCP
### Step Four: Create client pod in one namespace
Use the file [`examples/cluster-dns/dns-frontend-pod.yaml`](dns-frontend-pod.yaml) to create a client [pod](../../docs/pods.md) in dev namespace. The client pod will make a connection to backend and exit. Specifically, it tries to connect to address `http://dns-backend.development.kubernetes.local:8000`.
Use the file [`examples/cluster-dns/dns-frontend-pod.yaml`](dns-frontend-pod.yaml) to create a client [pod](../../docs/pods.md) in dev namespace. The client pod will make a connection to backend and exit. Specifically, it tries to connect to address `http://dns-backend.development.cluster.local:8000`.
```shell
$ kubectl config use-context dev
@ -115,19 +117,21 @@ Wait until the pod succeeds, then we can see the output from the client pod:
```shell
$ kubectl log dns-frontend
2015-05-07T20:13:54.147664936Z 10.0.236.129
2015-05-07T20:13:54.147721290Z Send request to: http://dns-backend.development.kubernetes.local:8000
2015-05-07T20:13:54.147721290Z Send request to: http://dns-backend.development.cluster.local:8000
2015-05-07T20:13:54.147733438Z <Response [200]>
2015-05-07T20:13:54.147738295Z Hello World!
```
Please refer to the [source code](./images/frontend/client.py) about the logs. First line prints out the ip address associated with the service in dev namespace; remaining lines print out our request and server response. If we switch to prod namespace with the same pod config, we'll see the same result, i.e. dns will resolve across namespace.
Please refer to the [source code](./images/frontend/client.py) about the log. First line prints out the ip address associated with the service in dev namespace; remaining lines print out our request and server response.
If we switch to prod namespace with the same pod config, we'll see the same result, i.e. dns will resolve across namespace.
```shell
$ kubectl config use-context prod
$ kubectl create -f examples/cluster-dns/dns-frontend-pod.yaml
$ kubectl log dns-frontend
2015-05-07T20:13:54.147664936Z 10.0.236.129
2015-05-07T20:13:54.147721290Z Send request to: http://dns-backend.development.kubernetes.local:8000
2015-05-07T20:13:54.147721290Z Send request to: http://dns-backend.development.cluster.local:8000
2015-05-07T20:13:54.147733438Z <Response [200]>
2015-05-07T20:13:54.147738295Z Hello World!
```
@ -135,7 +139,7 @@ $ kubectl log dns-frontend
#### Note about default namespace
If you prefer not using namespace, then all your services can be addressed using `default` namespace, e.g. `http://dns-backend.default.kubernetes.local:8000`, or shorthand version `http://dns-backend:8000`
If you prefer not using namespace, then all your services can be addressed using `default` namespace, e.g. `http://dns-backend.default.cluster.local:8000`, or shorthand version `http://dns-backend:8000`
[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/examples/cluster-dns/README.md?pixel)]()

2
examples/cluster-dns/dns-frontend-pod.yaml
View File

@ -11,6 +11,6 @@ spec:
command:
- python
- client.py
- http://dns-backend.development.kubernetes.local:8000
- http://dns-backend.development.cluster.local:8000
imagePullPolicy: Always
restartPolicy: Never