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Improve k8s DNS example usability (#164) 

the command in example should be straightforward asap, user just
do copy and paste to move on. This change is align with spark
example to set CLUSTER_NAME and USER_NAME, refer to below link for
the details:

https://github.com/kubernetes/examples/tree/master/staging/spark
This commit is contained in:
XiaoLiang Hu 2018-01-31 14:19:20 +08:00 committed by Ahmet Alp Balkan
parent 0b2b574d31
commit cee89cecb7
1 changed files with 8 additions and 4 deletions
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12
staging/cluster-dns/README.md
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@ -30,15 +30,16 @@ development name=development Active
production name=production Active
```
For kubectl client to work with each namespace, we define two contexts:
For kubectl client to work with each namespace, we define two contexts using our current context as a base:
```sh
$ CURRENT_CONTEXT=$(kubectl config view -o jsonpath='{.current-context}')
$ USER_NAME=$(kubectl config view -o jsonpath='{.contexts[?(@.name == "'"${CURRENT_CONTEXT}"'")].context.user}')
$ CLUSTER_NAME=$(kubectl config view -o jsonpath='{.contexts[?(@.name == "'"${CURRENT_CONTEXT}"'")].context.cluster}')
$ kubectl config set-context dev --namespace=development --cluster=${CLUSTER_NAME} --user=${USER_NAME}
$ 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](https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller/) in each namespace.
@ -143,7 +144,7 @@ If you prefer not using namespace, then all your services can be addressed using
### tl; dr;
For those of you who are impatient, here is the summary of the commands we ran in this tutorial. Remember to set first `$CLUSTER_NAME` and `$USER_NAME` to the values found in `~/.kube/config`.
For those of you who are impatient, here is the summary of the commands we ran in this tutorial. Remember the values of `$CLUSTER_NAME` and `$USER_NAME` are based on current context found in `~/.kube/config`.
```sh
# create dev and prod namespaces
@ -151,6 +152,9 @@ kubectl create -f examples/cluster-dns/namespace-dev.yaml
kubectl create -f examples/cluster-dns/namespace-prod.yaml
# create two contexts
CURRENT_CONTEXT=$(kubectl config view -o jsonpath='{.current-context}')
USER_NAME=$(kubectl config view -o jsonpath='{.contexts[?(@.name == "'"${CURRENT_CONTEXT}"'")].context.user}')
CLUSTER_NAME=$(kubectl config view -o jsonpath='{.contexts[?(@.name == "'"${CURRENT_CONTEXT}"'")].context.cluster}')
kubectl config set-context dev --namespace=development --cluster=${CLUSTER_NAME} --user=${USER_NAME}
kubectl config set-context prod --namespace=production --cluster=${CLUSTER_NAME} --user=${USER_NAME}