Problem with nagios configuration

[moulay ahmed boudbid]

Hello, trying to start nagios i had the message error whitch said that it couldn't open the file commands. and i realized that i don't have this file and when i check the file nagios.log (/usr/local/nagios/var/nagios.log) i found that it couldn't open also the files misccommands.cfg, contacts.cfg et resources.cfg ... 
what i have to do ? should i create the file commands and if it's so what i have to write into. and what i have to do for the others files and thank you
 

		
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