NFS Services Administrator's Guide (B.11.31.04) March 2009

NFS client to failover to either server onc21, onc23, or onc25 if the current
server has become unavailable.
• Mounting replicated set of NFS file systems with different pathnames
mount -r onc21:/Casey/Clay,onc23:/Var/Clay,nfs://srv-z/Clay /Casey/Clay
In this example, the NFS client mounts a replicated set of NFS file systems with
different pathnames.
Secure Mounting of Directories
The mount command enables you to specify the security mode for each NFS
mount-point. This allows the NFS client to request a specific security mode. However,
if the specific mode does not exist on the server, then the mount fails. Use the sec
option to specify the security mode.
If sec is not specified in NFSv2, then the AUTH_SYS mode is used by default. If sec
is not specified in NFSv3, then the default action is for the NFS client to query the server
about the security mode to be used. The resulting security mode is negotiated between
the NFS client and server. For more information on the available security modes, see
nfssec(5).
An Example for Securely Mounting a directory
In the following example, the NFS client forces the use of krb5 as the secure mode.
The krb5 secure mode uses the Kerberos V5 protocol to authenticate users before
granting access to the shared filesystems. In this example, the NFS server, onc21, also
supports the same secure mode.
mount -F nfs -o sec=krb5 onc21:/casey/nfs /casey/nfs
NOTE: For specific configuration information, see “Secure NFS Setup with Kerberos”
(page 36).
Changing the Default Mount Options
To change the default mount options, follow these steps:
1. Modify the NFS mount options in the /etc/fstab file, or the AutoFS map, as
needed. For more information on the different mount options that NFS supports,
see mount_nfs(1M).
If you changed the mount options for a directory that is currently mounted, you
must unmount and remount it before the changes take effect. To unmount and
remount the directory, enter the following commands:
Configuring and Administering NFS Clients 53