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Accessing Clusters

• Accessing the cluster API
  • Accessing for the first time with kubectl
  • Directly accessing the REST API
    • Using kubectl proxy
    • Without kubectl proxy
  • Programmatic access to the API
  • Accessing the API from a Pod
• Accessing services running on the cluster
  • Ways to connect
  • Discovering builtin services
    • Manually constructing apiserver proxy URLs
      • Examples
    • Using web browsers to access services running on the cluster
• Requesting redirects
• So Many Proxies

Accessing the cluster API

Accessing for the first time with kubectl

When accessing the Kubernetes API for the first time, we suggest using the Kubernetes CLI, kubectl.

To access a cluster, you need to know the location of the cluster and have credentials to access it. Typically, this is automatically set-up when you work through though a Getting started guide, or someone else setup the cluster and provided you with credentials and a location.

Check the location and credentials that kubectl knows about with this command:

$ kubectl config view

Many of the examples provide an introduction to using kubectl and complete documentation is found in the kubectl manual.

Directly accessing the REST API

Kubectl handles locating and authenticating to the apiserver. If you want to directly access the REST API with an http client like curl or wget, or a browser, there are several ways to locate and authenticate:

• Run kubectl in proxy mode.
  • Recommended approach.
  • Uses stored apiserver location.
  • Verifies identity of apiserver using self-signed cert. No MITM possible.
  • Authenticates to apiserver.
  • In future, may do intelligent client-side load-balancing and failover.
• Provide the location and credentials directly to the http client.
  • Alternate approach.
  • Works with some types of client code that are confused by using a proxy.
  • Need to import a root cert into your browser to protect against MITM.

Using kubectl proxy

The following command runs kubectl in a mode where it acts as a reverse proxy. It handles locating the apiserver and authenticating. Run it like this:

$ kubectl proxy --port=8080 &

See kubectl proxy for more details.

Then you can explore the API with curl, wget, or a browser, like so:

$ curl http://localhost:8080/api/
{
  "versions": [
    "v1"
  ]
}

Without kubectl proxy

It is also possible to avoid using kubectl proxy by passing an authentication token directly to the apiserver, like this:

$ APISERVER=$(kubectl config view | grep server | cut -f 2- -d ":" | tr -d " ")
$ TOKEN=$(kubectl config view | grep token | cut -f 2 -d ":" | tr -d " ")
$ curl $APISERVER/api --header "Authorization: Bearer $TOKEN" --insecure
{
  "versions": [
    "v1"
  ]
}

The above example uses the --insecure flag. This leaves it subject to MITM attacks. When kubectl accesses the cluster it uses a stored root certificate and client certificates to access the server. (These are installed in the ~/.kube directory). Since cluster certificates are typically self-signed, it may take special configuration to get your http client to use root certificate.

On some clusters, the apiserver does not require authentication; it may serve on localhost, or be protected by a firewall. There is not a standard for this. Configuring Access to the API describes how a cluster admin can configure this. Such approaches may conflict with future high-availability support.

Programmatic access to the API

There are client libraries for accessing the API from several languages. The Kubernetes project-supported Go client library can use the same kubeconfig file as the kubectl CLI does to locate and authenticate to the apiserver.

See documentation for other libraries for how they authenticate.

Accessing the API from a Pod

When accessing the API from a pod, locating and authenticating to the api server are somewhat different.

The recommended way to locate the apiserver within the pod is with the kubernetes DNS name, which resolves to a Service IP which in turn will be routed to an apiserver.

The recommended way to authenticate to the apiserver is with a service account credential. By kube-system, a pod is associated with a service account, and a credential (token) for that service account is placed into the filesystem tree of each container in that pod, at /var/run/secrets/kubernetes.io/serviceaccount/token.

If available, a certificate bundle is placed into the filesystem tree of each container at /var/run/secrets/kubernetes.io/serviceaccount/ca.crt, and should be used to verify the serving certificate of the apiserver.

Finally, the default namespace to be used for namespaced API operations is placed in a file at /var/run/secrets/kubernetes.io/serviceaccount/namespace in each container.

From within a pod the recommended ways to connect to API are:

• run a kubectl proxy as one of the containers in the pod, or as a background process within a container. This proxies the Kubernetes API to the localhost interface of the pod, so that other processes in any container of the pod can access it. See this example of using kubectl proxy in a pod.
• use the Go client library, and create a client using the client.NewInCluster() factory. This handles locating and authenticating to the apiserver.

In each case, the credentials of the pod are used to communicate securely with the apiserver.

Accessing services running on the cluster

The previous section was about connecting the Kubernetes API server. This section is about connecting to other services running on Kubernetes cluster. In Kubernetes, the 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:

• Access services through public IPs.
  • Use a service with type NodePort or LoadBalancer to make the service reachable outside the cluster. See the services and kubectl expose documentation.
  • Depending on your cluster environment, this may just expose the service to your corporate network, or it may expose it to the internet. Think about whether the service being exposed is secure. Does it do its own authentication?
  • Place pods behind services. To access one specific pod from a set of replicas, such as for debugging, place a unique label on the pod it and create a new service which selects this label.
  • In most cases, it should not be necessary for application developer to directly access nodes via their nodeIPs.
• Access services, nodes, or pods using the Proxy Verb.
  • Does apiserver authentication and authorization prior to accessing the remote service. Use this if the services are not secure enough to expose to the internet, or to gain access to ports on the node IP, or for debugging.
  • Proxies may cause problems for some web applications.
  • Only works for HTTP/HTTPS.
  • Described here.
• Access from a node or pod in the cluster.
  • Run a pod, and then connect to a shell in it using kubectl exec. Connect to other nodes, pods, and services from that shell.
  • Some clusters may allow you to ssh to a node in the cluster. From there you may be able to access cluster services. This is a non-standard method, and will work on some clusters but not others. Browsers and other tools may or may not be installed. Cluster DNS may not work.

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 https://104.197.5.247
  elasticsearch-logging is running at https://104.197.5.247/api/v1/proxy/namespaces/kube-system/services/elasticsearch-logging
  kibana-logging is running at https://104.197.5.247/api/v1/proxy/namespaces/kube-system/services/kibana-logging
  kube-dns is running at https://104.197.5.247/api/v1/proxy/namespaces/kube-system/services/kube-dns
  grafana is running at https://104.197.5.247/api/v1/proxy/namespaces/kube-system/services/monitoring-grafana
  heapster is running at https://104.197.5.247/api/v1/proxy/namespaces/kube-system/services/monitoring-heapster

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 https://104.197.5.247/api/v1/proxy/namespaces/kube-system/services/elasticsearch-logging/ if suitable credentials are passed, or through a kubectl proxy at, for example: http://localhost:8080/api/v1/proxy/namespaces/kube-system/services/elasticsearch-logging/. (See above 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/proxy/namespaces/namespace_name/services/service_name[:port_name]

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

Examples

• To access the Elasticsearch service endpoint _search?q=user:kimchy, you would use: http://104.197.5.247/api/v1/proxy/namespaces/kube-system/services/elasticsearch-logging/_search?q=user:kimchy
• To access the Elasticsearch cluster health information _cluster/health?pretty=true, you would use: https://104.197.5.247/api/v1/proxy/namespaces/kube-system/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
  }

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:

• Web browsers cannot usually pass tokens, so you may need to use basic (password) auth. Apiserver can be configured to accept basic auth, but your cluster may not be configured to accept basic auth.
• Some web apps may not work, particularly those with client side javascript that construct urls in a way that is unaware of the proxy path prefix.

Requesting redirects

The redirect capabilities have been deprecated and removed. Please use a proxy (see below) instead.

So Many Proxies

There are several different proxies you may encounter when using Kubernetes:

1. The kubectl proxy: - runs on a user’s desktop or in a pod - proxies from a localhost address to the Kubernetes apiserver - client to proxy uses HTTP - proxy to apiserver uses HTTPS - locates apiserver - adds authentication headers
2. The apiserver proxy: - is a bastion built into the apiserver - connects a user outside of the cluster to cluster IPs which otherwise might not be reachable - runs in the apiserver processes - client to proxy uses HTTPS (or http if apiserver so configured) - proxy to target may use HTTP or HTTPS as chosen by proxy using available information - can be used to reach a Node, Pod, or Service - does load balancing when used to reach a Service
3. The kube proxy: - runs on each node - proxies UDP and TCP - does not understand HTTP - provides load balancing - is just used to reach services
4. A Proxy/Load-balancer in front of apiserver(s): - existence and implementation varies from cluster to cluster (e.g. nginx) - sits between all clients and one or more apiservers - acts as load balancer if there are several apiservers.
5. Cloud Load Balancers on external services: - are provided by some cloud providers (e.g. AWS ELB, Google Cloud Load Balancer) - are created automatically when the Kubernetes service has type LoadBalancer - use UDP/TCP only - implementation varies by cloud provider.

Kubernetes users will typically not need to worry about anything other than the first two types. The cluster admin will typically ensure that the latter types are setup correctly.