System Administration Guide: Network Services

Checking for the NFS Version 4 Domain

Before assigning a value for your network's NFS version 4 domain, check to see if an NFS version 4 domain has already been configured for your network. The following examples provide ways of identifying your network's NFS version 4 domain.

To identify the NFS version 4 domain from a DNS TXT RR, use either the nslookup or the dig command:

The following provides sample output for the nslookup command:

# nslookup -q=txt _nfsv4idmapdomain
Server:         10.255.255.255
Address:        10.255.255.255#53

_nfsv4idmapdomain.example.company.com text = "company.com"

See this sample output for the dig command:

# dig +domain=example.company.com -t TXT _nfsv4idmapdomain
...
;; QUESTION SECTION:
;_nfsv4idmapdomain.example.company.com. IN    TXT

;; ANSWER SECTION:
_nfsv4idmapdomain.example.company.com. 21600 IN TXT   "company.com"

;; AUTHORITY SECTION:
...

For information about setting up a DNS TXT RR, see nfsmapid and DNS TXT Records.

If your network is not setup with a NFS version 4 DNS TXT RR, use the following command to identify your NFS version 4 domain from the DNS domain name:
# egrep domain /etc/resolv.conf domain example.company.com
If the /etc/resolv.conf file is not configured to provide a DNS domain name for the client, use the following command to identify the domain from the network's NFS version 4 domain configuration:
# cat /var/run/nfs4_domain company.com
If you are using a different naming service, such as NIS, use the following command to identify the domain for the naming service configured for your network:
# domainname it.example.company.com

For more information, see the following man pages: