What are alternate password files ?
This version of xtacacsd can look in alternate password files in addition to the standard Unix /etc/passwd file. Upto five alternate password files can be specified in the configuration file. This allows creating a redundant backup server so that in case the primary machine is down, the alternate machine can act like a backup server. Simply ‘rcp’ the tacacs password file over from the primary server to the backup server. You can place the alternate password files in any separate directory. Since the xtacacsd daemon runs as root, you should set the permissions on the alternate password files to root readable only.