Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - COMMAND-LINE Manuale Utente Scaricare il pdf (Pagina 33)

Now allow whatever hosts/networks you are going to allow to query your

server for time – for example:

# Allowed clients

restrict 10.0.0.0 mask 255.0.0.0 nomodify

restrict 172.16.0.0 mask 255.255.224.0 nomodify

restrict 192.168.0.0 mask 255.255.0.0 nomodify

restrict 207.169.53.0 mask 255.255.255.0 nomodify

Set the logfile:

#Logfile

logconfig all

logfile /var/log/ntpd

Set the driftfile. This file will hold the “drift” or time shift due to network

latency:

# Driftfile

driftfile /etc/ntp/drift

Set “Step-

Tickers”

The server in the /etc/ntp/step-tickers file will be the ones that your server will

sync with immediately when it boots up:

vim /etc/ntp/step-tickers

Now simply add the IP addresses of your upstream servers that you’re getting

time from, one on each line, such as:

198.30.92.2

128.10.252.7

130.126.24.44

That’s it. Save and close the file.

Update Your

System Clock

Run the ntpdate command against each IP address of your upstream servers 2

or 3 times each. You should see the “jitter” come way down between the first

time you run it and the last:

ntpdate 198.30.92.2

ntpdate 128.10.252.7

ntpdate 130.126.24.44

Start your

Service

Start your NTP daemon:

service ntpd restart

Then turn it on to run automatically:

chkconfig –level 2345 ntpd on

Now that ntp is running, to determine if it is synchronizing properly, issue the command (wait a

couple of minutes after starting the ntpd service before running this command):

ntpq –p

This command should show output similar to below:

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 59 60

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Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - COMMAND-LINE Manuale Utente Pagina 33

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