Script for shutting down system at 9.00 PM in Centos

CentOS
#1

Hai,

Please help me out with a script for shutting down system at 9.00 PM/if any system is ideal for half an hour the system should be shutdown daily in Centos. I have configured with Ldap server and having six clients systems. and I want to run through the ldap server.

#2

  1. setup password less authentication for one user on all server

  2. grant sudo privilege (shutdown) to the user

  3. schedule cron job on ldap server to ssh -q server sudo -s /sbin/shutdown -h

my question here who bring up the server once shutdown ?