How to configure the NTP in AIX and LINUX ?
1. Stop the ntp services
#stopsrc –s xntpd
2. Sync the time with ntp, login as root, type
#ntpdate <ip_address of the NTP server>
3. Make a copy of the file /etc/ntp.conf
#cp /etc/ntp.conf /etc/ntp.conf_bak
4. Edit file /etc/ntp.conf and append
server <ip_address of the NTP server>
driftfile /var/lib/ntp/drift
tracefile /etc/ntp.trace
5. Create the /var/lib/ntp directory and ensure /var/lib/ntp has correct ownership and permissions
#mkdir /var/lib/ntp
( dwxr-xr-x 2 ntp ntp 4096 Mar 2 11:09 )
6. Create the file /var/lib/ntp/drift with the following entry:
0.0
7. After creating the drift file, ensure that it has the right ownership and permissions:
-rw-r--r-- 1 ntp ntp 6 Mar 2 11:09 drift
8. Start the NTP sercice
#startsrc –s xntpd
9. Take backup and uncomment xntpd from /etc/rc.tcpip. so it will start on a reboot.
#cp –p /etc/rc.tcpip /etc/rc.tcpip_bak
#vi /etc/rc.tcpip
Uncomment the following line
Start /usr/sbin/xntpd “$src-running”
10. Verify that the server is synched.
#lssrc -ls xntpd
A) STEPS
For RHEL pls follow the below steps:
1. stop the NTP service
#service ntpd stop
2. Make a copy of the file /etc/ntp.conf
#cp /etc/ntp.conf /etc/ntp.conf_bak
3. Edit the file /etc/ntp.conf with the following entries:
server <IP_address of the NTP server>
server <IP_address of the NTP server>
driftfile /var/lib/ntp/drift
4. Create the /var/lib/ntp directory if it’s not exist and ensure /var/lib/ntp has correct ownership and permissions
#mkdir /var/lib/ntp
( dwxr-xr-x 2 ntp ntp 4096 Mar 2 11:09 )
5. Create the file /var/lib/ntp/drift with the following entry:
0.0
6. After creating the drift file, ensure that it has the right ownership and permissions:
-rw-r--r-- 1 ntp ntp 6 Mar 2 11:09 drift
7. After restarting the ntpd service, ensure that spurious messages in the /var/log/messages file are no longer reported:
can't open /etc/ntp.drift.TEMP: Permission denied
8. Bounce NTP service.
# service ntpd restart
9. Status checking
# ntpq
ntpq> peers
10. Make sure the ntp starts automatically start at the boot time
# chkconfig ntpd on
For AIX please follow the below steps:
#stopsrc –s xntpd
2. Sync the time with ntp, login as root, type
#ntpdate <ip_address of the NTP server>
3. Make a copy of the file /etc/ntp.conf
#cp /etc/ntp.conf /etc/ntp.conf_bak
4. Edit file /etc/ntp.conf and append
server <ip_address of the NTP server>
driftfile /var/lib/ntp/drift
tracefile /etc/ntp.trace
5. Create the /var/lib/ntp directory and ensure /var/lib/ntp has correct ownership and permissions
#mkdir /var/lib/ntp
( dwxr-xr-x 2 ntp ntp 4096 Mar 2 11:09 )
6. Create the file /var/lib/ntp/drift with the following entry:
0.0
7. After creating the drift file, ensure that it has the right ownership and permissions:
-rw-r--r-- 1 ntp ntp 6 Mar 2 11:09 drift
8. Start the NTP sercice
#startsrc –s xntpd
9. Take backup and uncomment xntpd from /etc/rc.tcpip. so it will start on a reboot.
#cp –p /etc/rc.tcpip /etc/rc.tcpip_bak
#vi /etc/rc.tcpip
Uncomment the following line
Start /usr/sbin/xntpd “$src-running”
10. Verify that the server is synched.
#lssrc -ls xntpd
B) VALIDATION:
ntpdate –q <ntpserver> should not show the time difference more than 1 sec.
C) ROLLBACK
Replace all the configuration files that you have modified with the backup copies taken at the time of implementation .
