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
the 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 NIS group 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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