website/docs/user-guide/services/operations.md

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* TOC
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Services map a port on each cluster node to ports on one or more pods.

The mapping uses a `selector` key:value pair in the service, and the
`labels` property of pods. Any pods whose labels match the service selector
are made accessible through the service's port.

For more information, see the
[Services Overview](/docs/user-guide/services/).

## Create a service

Services are created by passing a configuration file to the `kubectl create`
command:

```shell
$ kubectl create -f FILE
```

Where:

* `-f FILE` or `--filename FILE` is a relative path to a
  [service configuration file](#service-configuration-file) in either JSON
  or YAML format.

A successful service create request returns the service name. You can use
a [sample file](#sample_files) below to try a create request.

### Service configuration file

When creating a service, you must point to a service configuration file as the
value of the `-f` flag. The configuration file can be formatted as
YAML or as JSON, and supports the following fields:

```json
{
  "kind": "Service",
  "apiVersion": "v1",
  "metadata": {
    "name": string
  },
  "spec": {
    "ports": [{
      "port": int,
      "targetPort": int
    }],
    "selector": {
      string: string
    },
    "type": "LoadBalancer"
  }
}
```

Required fields are:

* `kind`: Always `Service`.
* `apiVersion`: Currently `v1`.
* `metadata`: Contains:
    * `name`: The name to give to this service.
* `spec`: Contains:
    * `ports`: The ports to map. `port` is the service port to expose on the
      cluster IP. `targetPort` is the port to target on the pods that are part
      of this service.
    * `selector`: The label key:value pair that defines the pods to
      target.
    * `type`: Optional. If the type is `LoadBalancer`, sets up a [network load balancer](/docs/user-guide/load-balancer/)
      for your service. This provides an externally-accessible IP address that
      sends traffic to the correct port on your cluster nodes. 

For the full `service` schema see the
[Kubernetes api reference](/docs/api-reference/v1/definitions/#_v1_service).

### Sample files

The following service configuration files assume that you have a set of pods
that expose port 9376 and carry the label `app=example`.

Both files create a new service named `myapp` which resolves to TCP port 9376
on any pod with the `app=example` label.

The difference in the files is in how the service is accessed. The first file
does not create an external load balancer; the service can be accessed through
port 8765 on any of the nodes' IP addresses.

{% capture tabspec %}servicesample
JSON,json,service-sample.json,/docs/user-guide/services/service-sample.json
YAML,yaml,service-sample.yaml,/docs/user-guide/services/service-sample.yaml{% endcapture %}
{% include tabs.html %}

The second file uses
[network load balancing](/docs/user-guide/load-balancer/) to create a
single IP address that spreads traffic to all of the nodes in
your cluster. This option is specified with the
`"type": "LoadBalancer"` property.

{% capture tabspec %}loadbalancesample
JSON,json,load-balancer-sample.json,/docs/user-guide/services/load-balancer-sample.json
YAML,yaml,load-balancer-sample.yaml,/docs/user-guide/services/load-balancer-sample.yaml{% endcapture %}
{% include tabs.html %}

To access the service, a client connects to the external IP address, which
forwards to port 8765 on a node in the cluster, which in turn accesses
port 9376 on the pod. See the
[Service configuration file](#service-configuration-file) section of this doc
for directions on finding the external IP address.

## View a service

To list all services on a cluster, use the
`kubectl get` command:

```shell
$ kubectl get services
```

A successful get request returns all services that exist on the specified
cluster:

```shell
NAME    LABELS   SELECTOR    IP              PORT
myapp   <none>   app=MyApp   10.123.255.83   8765/TCP
```

To return information about a specific service, use the
`kubectl describe` command:

```shell
$ kubectl describe service NAME
```

Details about the specific service are returned:

```conf
Name:                   myapp
Labels:                 <none>
Selector:               app=MyApp
IP:                     10.123.255.83
Port:                   <unnamed>       8765/TCP
NodePort:               <unnamed>       31474/TCP
Endpoints:              <none>
Session Affinity:       None
No events.
```

To return information about a service when event information is not required,
substitute `get` for `describe`.

## Delete a service

To delete a service, use the `kubectl delete` command:

```shell
$ kubectl delete service NAME
```

A successful delete request returns the deleted service's name.