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if you're running ntp on them, just run "ntpq -pn" to list the state of time syncing. probably easiest just to sync them all to pool.ntp.org and also if relevant list each others as peers. alternatively you could make one a nominal master and sync all others that one box, with that alone going to pool.ntp.org. note that ntp only actively syncs against a single "best" source, not averaging out this and that.
Both Suse & RH have tools to set up ntp servers. I find the best time keeping is had using a subset of your nearest country server rather than the generic. I use the subset starting 0.uk.pool.ntp to 3.uk.pool.ntp.org
Yes, i'ved already know the command "ntpq -pn", but our client doesn't want to use ntp client, because for some reason, this conflicts with their inhouse software (Yeah ,I know what you think, but it's our spoiled client and i don't want to argue with them) that's why i decided to use crontab and the command "ntpdate -u clock.redhat.com".
Now that everything synchronize, my question is, any software to manage or monitor this in a centralized server?
no ieda really, doesn't seem like something inherently worth monitoring in itself. you could easily set up net-snmp to return the current system date within an oid and track this on some central snmp polling system. similar way could be a very basic php page or something to print the time...
hmmm... if i'll use a network management using snmp, on 24 servers, i think it will make a lot of time just to check if all is synchronize, in your other option, well i guess making a program in php or probably a script will make the work than.
And it seems that i need to know some programming to do this.
Anyway, Thank you for all your replies to this thread =)