3. Validating Service Connectivity

Use the commands in this section to test connectivity between the gateway host and the Hadoop service, and then test connectivity between an external client to the Hadoop service through the gateway.

	Tip
	If the communication between the gateway host and an internal Hadoop service fails, telnet to the service port to verify that the gateway is able to access the cluster node. Use the hostname and ports you specified in the service definition.

Testing WebHDFS by getting the home directory

At the gateway host, enter curl http:// $webhdfs-host :50070/webhdfs/v1?op=GETHOMEDIRECTORY. The host displays:
```
{"Path":"/user/gopher"}
```
At an external client, enter curl https:// $gateway-host : $gateway_port / $gateway / $cluster_name / $webhdfs_service_name /v1?op=GETHOMEDIRECTORY. The external client displays:
```
{"Path":"/user/gopher"}
```

Testing WebHCat/Templeton by getting the version

At the gateway host, enter curl http:// $webhdfs-host :50070/templeton/v1/version. The host displays:
```
{"supportedVersions":["v1"],"version":"v1"}
```
At an external client, enter curl https:// $gateway-host : $gateway_port / $gateway / $cluster_name / $webhcat_service_name /v1/version. The external client displays:
```
{"supportedVersions":["v1"],"version":"v1"}
```

Testing Oozie by getting the version

At the gateway host, enter curl http://$oozie-host:11000/oozie/v1/admin/build-version. The host displays:
```
{"buildVersion":"4.0.0.2.1.1.0-302"} 
```
At an external client, enter curl https://$gateway-host : $gateway_port/$gateway / $cluster_name/$oozie_service_name/v1/admin/build-version. The external client displays:
```
{"buildVersion":"4.0.0.2.1.1.0-302"}
```

Testing HBase/Stargate by getting the version

At the gateway host, enter curl http:// $hbase-host :17000/version. The host displays:

rest 0.0.2 JVM: Oracle Corporation 1.7.0_51-24.45-b08 OS: Linux 3.8.0-29-generic amd64 Server: jetty/6.1.26 Jersey: 1.8:

At an external client, enter curl http:// $hbase-host :17000/version. The external client displays:
```
rest 0.0.2 JVM: Oracle Corporation 1.7.0_51-24.45-b08 OS: Linux 3.8.0-29-generic amd64 Server: jetty/6.1.26 Jersey: 1.8
```

Testing HiveServer2

Both of the following URLs return an authentication error, which users can safely ignore.

At the gateway host, enter:
curl http:// $hive-host :10001/cliservice
At an external client, enter:
curl https:// $gateway-host : $gateway_port / $gateway / $cluster_name / $hive_service_name /cliservice

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