Step-by-step instructions for performing operations with Kubernetes.

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Access Services Running on Clusters

This page shows how to connect to services running on the Kubernetes cluster.

Before you begin

You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using Minikube, or you can use one of these Kubernetes playgrounds:

To check the version, enter kubectl version.

Accessing services running on the cluster

In Kubernetes, nodes, pods and services all have their own IPs. In many cases, the node IPs, pod IPs, and some service IPs on a cluster will not be routable, so they will not be reachable from a machine outside the cluster, such as your desktop machine.

Ways to connect

You have several options for connecting to nodes, pods and services from outside the cluster:

Discovering builtin services

Typically, there are several services which are started on a cluster by kube-system. Get a list of these with the kubectl cluster-info command:

$ kubectl cluster-info

  Kubernetes master is running at
  elasticsearch-logging is running at
  kibana-logging is running at
  kube-dns is running at
  grafana is running at
  heapster is running at

This shows the proxy-verb URL for accessing each service. For example, this cluster has cluster-level logging enabled (using Elasticsearch), which can be reached at if suitable credentials are passed, or through a kubectl proxy at, for example: http://localhost:8080/api/v1/namespaces/kube-system/services/elasticsearch-logging/proxy/. (See Access Clusters Using the Kubernetes API for how to pass credentials or use kubectl proxy.)

Manually constructing apiserver proxy URLs

As mentioned above, you use the kubectl cluster-info command to retrieve the service’s proxy URL. To create proxy URLs that include service endpoints, suffixes, and parameters, you simply append to the service’s proxy URL: http://kubernetes_master_address/api/v1/namespaces/namespace_name/services/service_name[:port_name]/proxy

If you haven’t specified a name for your port, you don’t have to specify port_name in the URL

    "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

Using web browsers to access services running on the cluster

You may be able to put an apiserver proxy URL into the address bar of a browser. However:


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