Before you configure your system as an NFS server or as an NFS
client, perform the following prerequisite checks:
Verify network connectivity
Verify user IDs and group IDs setup
Verify group restrictions
Verifying Network Connectivity |
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Before you configure NFS, you must have already installed and
configured the network hardware and software on all the systems that
use NFS. For information on installing and configuring the network
hardware and software, see the following documents:
HP-UX LAN Administrator’s Guide (B2355-90796)
Ethernet Configuration and Verification (5991-5954)
To check the network connections between the server and clients,
use the /usr/sbin/ping command to
verify network connectivity between your proposed NFS client and server
systems.
Verifying User IDs and Group IDs Setup |
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When users request NFS access to remote files, their user IDs
and group IDs are used to check file ownership and permissions.
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 | NOTE: NFSv4 uses string identifiers that map to user IDs and group
IDs in the standard integer format. For more information on string
identifiers supported on NFSv4, see “New Features in NFS”. |
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Consider the following points when you set user IDs and group
IDs:
Each user must have the same user ID on all systems
where that user has an account.
Each group has the same group ID on all systems where
that group exists.
No two users on the network have the same user ID.
No two groups on the network have the same group ID.
You can set user and group IDs in the following methods:
Using the HP-UX System Files (/etc/passwd and /etc/group)
Using the HP-UX System Files
If you are using the HP-UX system files, add the users and groups
to the /etc/passwd and /etc/group files, respectively. Copy these files to all the systems on the
network.
For more information on the /etc/passwd and /etc/group files, see passwd(4) and group(4).
Using NIS
If you are using NIS, all systems on the network request user
and group information from the NIS maps on the NIS server. For more
information on configuring NIS, see NIS Administrator's Guide (5991-7656).
Using LDAP
If you are using LDAP, all systems on the network request user
and group information from the LDAP directory server. For more information
on configuring LDAP, see the LDAP-UX Client Services B.04.00
Administrator’s Guide(J4269-90064).
Verifying Group Restrictions |
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HP-UX supports 20 group entries per user, but the maximum number
of group entries supported by RPC is 16. If a user is a member of
more than 16 groups, NFS truncates the number of entries to 16 when
the user attempts access to files or directories. Use the groups command to find the group membership of a user. For more information
on groups, see groups(1). To ensure that a user is
not a member of more than 16 groups, use the following procedures
depending on the user and group configuration method you use:
Using the HP-UX System Files
Using the HP-UX System Files
If you are using HP-UX system files to manage your group database, follow these steps:
To identify the number of groups that the user belongs
to, enter the following command for each user on your system:
/usr/bin/grep -x -c username /etc/group |
This command returns the number of occurrences of username in the /etc/group file.
To remove a user from one or more groups, delete the
user from the group entries in the /etc/group file.
Using NIS
If you are using NIS to manage your group database, follow these steps:
To identify the number of groups that the user belongs
to, enter the following command :
/usr/bin/ypcat -k group | /usr/bin/grep -c username |
This command returns the number of occurrences of username in the NISgroup map.
To remove the user from one or more groups in the
NIS map, follow the instructions described in the NIS Administrator’s
Guide (5991-7656).
Using LDAP
For more information on managing user profiles using LDAP, see
the LDAP-UX Client Services B.04.00 Administrator’s
Guide (J4269-90064).
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