Red Hat ENTERPRISE LINUX 5 - CONFIGURATION NFS OVER GFS Configuration Manual page 29

• Execute a showmount -e command on the node running the cluster service. If it shows up the
right 5 exports, check your firewall configuration for all necessary ports for using NFS.
• If SELinux is currently in enforcing mode on your system, check your /var/log/audit.log
file for any relevant messages. If you are using NFS to serve home directories, check whether the
correct SELinux boolean value for nfs_home_dirs has been set to 1; this is required if you want to
use NFS-based home directories on a client that is running SELinux. If you do not set this value on,
you can mount the directories as root but cannot use them as home directories for your users.
• Check the /var/log/messages file for error messages from the NFS daemon.
• If you see the expected results locally at the cluster nodes and between the cluster nodes but not at
the defined clients, check the firewall configuration at the clients.
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