Export ViewFs mounts using the NFS Gateway

You can export ViewFs mounts using the NFS Gateway. For every ViewFs mount entry to export, you must specify an NFS export point and mount it to a corresponding directory path on the NFS Gateway.

The file with the ViewFs mount table entries must already be created.

You can export only those ViewFs mounts that have HDFS as the underlying file system.

Configure the proxy user for the NFS Gateway and the various Gateway settings.
Configure the NFS Gateway
Start the following daemons to run the NFS services on the Gateway: rpcbind (or portmap), mountd, and nfsd.
Start and stop the NFS Gateway services
In the NFS Gateway node, specify an export point corresponding to each ViewFs mount that you want to export.
Consider the following example of a ViewFs mount table entry:
```
  
 <property>
   <name>fs.viewfs.mounttable.ClusterX.link./home</name>
   <value>hdfs://nn1-clusterx.example.com:8020/home</value>
 </property>
 
```
You can specify a corresponding NFS export point as follows:
```
<property>
  <name>nfs.export.point</name>
  <value>/home</value>
</property>
```
Verify if the exported namespace can be mounted.
```
showmount -e $nfs_server_ip
```
Note
The IP address of the NFS Gateway need not be the same as the IP address of the NameNode.
Mount the exported namespace to a corresponding path on the NFS Gateway.
For the export point example in step 3, you can create a mount as follows:
```
mount -t nfs -o vers=3,proto=tcp,nolock,noacl,sync nfs_server_ip:/home /mount_dir
```

	Note
	The IP address of the NFS Gateway need not be the same as the IP address of the NameNode.