2. Start and Verify the NFS Gateway Service

Three daemons are required to provide NFS service: rpcbind (or portmap), mountd and nfsd. The NFS gateway process has both nfsd and mountd. It shares the HDFS root "/" as the only export.

We recommend using the portmap included in NFS gateway package, as shown below:

Stop nfs/rpcbind/portmap services provided by the platform:
service nfs stop
service rpcbind stop
Start the included portmap package (needs root privileges), using one of the following two commands:
hadoop portmap
OR
hadoop-daemon.sh start portmap

Start mountd and nfsd.

No root privileges are required for this command. However, verify that the user starting the Hadoop cluster and the user starting the NFS gateway are the same.

hadoop nfs3

hadoop-daemon.sh start nfs3

Note

	Note
If the `hadoop-daemon.sh` script starts the NFS gateway, its log file can be found in the hadoop log folder (`/var/log/hadoop`). For example, if you launched the NFS gateway services as the root user, the log file would be found in a path similar to the following: `/var/log/hadoop/root/hadoop-root-nfs3-63ambarihdp21.log`

If the hadoop-daemon.sh script starts the NFS gateway, its log file can be found in the hadoop log folder (/var/log/hadoop).

For example, if you launched the NFS gateway services as the root user, the log file would be found in a path similar to the following:

/var/log/hadoop/root/hadoop-root-nfs3-63ambarihdp21.log

Stop the NFS gateway services.
hadoop-daemon.sh stop nfs3
hadoop-daemon.sh stop portmap

Next, verify the validity of NFS-related services.

Execute the following command to verify that all the services are up and running:

rpcinfo -p $nfs_server_ip

You should see output similar to the following:

   program vers proto   port
    100005    1   tcp   4242  mountd
    100005    2   udp   4242  mountd
    100005    2   tcp   4242  mountd
    100000    2   tcp    111  portmapper
    100000    2   udp    111  portmapper
    100005    3   udp   4242  mountd
    100005    1   udp   4242  mountd
    100003    3   tcp   2049  nfs
    100005    3   tcp   4242  mountd

Verify that the HDFS namespace is exported and can be mounted:
showmount -e $nfs_server_ip
You should see output similar to the following:
```
Exports list on $nfs_server_ip :
/ (everyone)
```

Legal notices