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First cut at adding documentation for accessing the cluster

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Satnam Singh 2015-03-04 13:04:38 -08:00
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# Accessing the Cluster
## Using the Kubernetes proxy to access the cluster
Information about the cluster can be accessed by using a proxy URL and by providing the keys to the cluster.
For example, for a cluster that has cluster-level logging enabled using Elasticsearch you can fetch information about
the Elasticsearch logging cluster.
First, you will need to obtain the keys (username and password) for your cluster:
```
$ cat ~/.kube/kubernetes-satnam2_kubernetes/kubernetes_auth
{
"User": "admin",
"Password": "4mty0Vl9nNFfwLJz",
"CAFile": "/Users/satnam/.kube/kubernetes-satnam2_kubernetes/kubernetes.ca.crt",
"CertFile": "/Users/satnam/.kube/kubernetes-satnam2_kubernetes/kubecfg.crt",
"KeyFile": "/Users/satnam/.kube/kubernetes-satnam2_kubernetes/kubecfg.key"
}
```
To access a service endpoint `/alpha/beta/gamma/` via the proxy service for your service `myservice` you need to specify an HTTPS address
for the Kubernetes master followed by `/api/v1beta1/proxy/services/myservice/alpha/beta/gamma/`. Currently it is important to
specify the trailing `/`.
Here is a list of representative cluster-level system services:
```
$ kubectl get services --selector="kubernetes.io/cluster-service=true"
NAME LABELS SELECTOR IP PORT
elasticsearch-logging kubernetes.io/cluster-service=true,name=elasticsearch-logging name=elasticsearch-logging 10.0.251.46 9200
kibana-logging kubernetes.io/cluster-service=true,name=kibana-logging name=kibana-logging 10.0.118.199 5601
kube-dns k8s-app=kube-dns,kubernetes.io/cluster-service=true k8s-app=kube-dns 10.0.0.10 53
monitoring-grafana kubernetes.io/cluster-service=true,name=grafana name=influxGrafana 10.0.15.119 80
monitoring-heapster kubernetes.io/cluster-service=true,name=heapster name=heapster 10.0.101.222 80
monitoring-influxdb kubernetes.io/cluster-service=true,name=influxdb name=influxGrafana 10.0.155.212 80
```
Using this information you can now issue the following `curl` command to get status information about
the Elasticsearch logging service.
```
$ curl -k -u admin:4mty0Vl9nNFfwLJz https://104.197.5.247/api/v1beta1/proxy/services/elasticsearch-logging/
{
"status" : 200,
"name" : "Senator Robert Kelly",
"cluster_name" : "kubernetes_logging",
"version" : {
"number" : "1.4.4",
"build_hash" : "c88f77ffc81301dfa9dfd81ca2232f09588bd512",
"build_timestamp" : "2015-02-19T13:05:36Z",
"build_snapshot" : false,
"lucene_version" : "4.10.3"
},
"tagline" : "You Know, for Search"
}
```
You can provide a suffix and parameters:
```
$ curl -k -u admin:4mty0Vl9nNFfwLJz https://104.197.5.247/api/v1beta1/proxy/services/elasticsearch-logging/_cluster/health?pretty=true
{
"cluster_name" : "kubernetes_logging",
"status" : "yellow",
"timed_out" : false,
"number_of_nodes" : 1,
"number_of_data_nodes" : 1,
"active_primary_shards" : 5,
"active_shards" : 5,
"relocating_shards" : 0,
"initializing_shards" : 0,
"unassigned_shards" : 5
}
```
You can also visit the endpoint of a service via the proxy URL e.g.
```
https://104.197.5.247/api/v1beta1/proxy/services/kibana-logging/
```
The first time you access the cluster using a proxy address from a browser you will be prompted
for a username and password which can also be found in the `User` and `Password` fields of the `kubernetes_auth`
file.