Configuring NFS 4.0

Use this procedure to configure NFS 4.0 on delegate hosts if the operating system release is 7.4 or a more recent release. There may be a file locking defect in NFS 4.1 with RHEL/CentOS 7.4.

Log in to the host as root or as a user with superuser privileges.
Determine which release is installed.
```
cat /etc/redhat-release
```
- If the result is 7.4 or greater, perform the remaining steps of this procedure.
- If the result includes 7.2 or 7.3, continue to the next procedure.
Change the NFS configuration file.
1. Open /etc/nfsmount.conf with a text editor.
2. Locate the Defaultvers directive.
3. Remove the number sign character (#) from the beginning of the line.
4. Change the value from 4 to 4.0.
  The line should appear as follows:
  Defaultvers=4.0
5. Save the file, and then close the editor.
Restart the NFS server.
```
systemctl restart nfs-server
```