HP XC System Software Administration Guide Version 3.2

Note:
Make sure that users who change their user account parameters do so on the golden client node,
or that they notify you from which node they changed their parameters.
You must propagate these user account changes to all the other nodes in the system as described
in “Distributing Software Throughout the System” (page 139).
14.5 Deleting a Local User Account
Remove a user account with the userdel command; you must be superuser on the golden client
node to use this command. This command provides the -r option, which removes that user's
home directory, all the files in that directory, and the user's mail spool.
Make sure that you propagate these changes to all the other nodes in the system as described in
“Distributing Software Throughout the System” (page 139).
14.6 Configuring the ssh Keys for a User
The ssh command requires a login and password whenever a user logs into a node and run jobs
on various node allocations. You can configure the ssh keys for a user to bypass the login and
password requirement.
The ssh_create_shared_keys command, used on a one-time basis, updates the appropriate
ssh key files in the user's $HOME/.ssh directory, provided:
• The user must have an account on the HP XC system.
• The user's home directory is mounted on all the nodes.
• Write permission for the user's home directory is denied for group and others.
The format of the command is as follows, where login is the login name for the specified user:
ssh_create_shared_keys [ --user login]
Entering the ssh_create_shared_keys command without the --user option updates the
ssh key files for the current user.
14.7 Synchronizing the NIS Database
If you configured a slave Network Information Service (NIS) server on the head node, you must
ensure that the NIS database on the head node is synchronized periodically with the NIS master
server.
The following procedure uses the cron utility and the ypxfr command and scripts to automate
periodic updates of the NIS database. For more information on the ypxfr command, see ypxfr(8).
Note:
The ypxfr scripts are located in the /usr/lib/yp directory on Itanium®-based systems and
in the /usr/lib64/yp directory on other systems.
1. Log in as superuser on the head node.
2. Make a copy of the root crontab file into a temporary file named /tmp/root_crontab:
# crontab -l >/tmp/root_crontab 2>/dev/null
14.5 Deleting a Local User Account 161