[root@fbakirpomd4 bin]# systemctl stop ntpd
[root@fbakirpomd4 bin]# chkconfig ntpd off
Note: Forwarding request to 'systemctl disable ntpd.service'.
[root@fbakirpomd4 bin]# systemctl enable chronyd
[root@fbakirpomd4 bin]# systemctl start chronyd
[root@fbakirpomd4 bin]# ps -ef | grep cronyd
root     23225 26147  0 10:11 pts/1    00:00:00 grep --color=auto cronyd
[root@fbakirpomd4 bin]# ps -ef | grep chronyd
chrony   23208     1  0 10:11 ?        00:00:00 /usr/sbin/chronyd
root     23253 26147  0 10:11 pts/1    00:00:00 grep --color=auto chronyd
[root@fbakirpomd4 bin]# cat /etc/chrony.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
# server 0.rhel.pool.ntp.org iburst
# server 1.rhel.pool.ntp.org iburst
# server 2.rhel.pool.ntp.org iburst
# server 3.rhel.pool.ntp.org iburst
##############################################################
#
# Added local hosts for xxxxxxxx xxxxx chrony servers
#
##############################################################
server 10.1.100.134 iburst
server 10.235.100.19 iburst
##############################################################

# Record the rate at which the system clock gains/losses time.
driftfile /var/lib/chrony/drift

# Allow the system clock to be stepped in the first three updates
# if its offset is larger than 1 second.
makestep 1.0 3

# Enable kernel synchronization of the real-time clock (RTC).
rtcsync

# Enable hardware timestamping on all interfaces that support it.
#hwtimestamp *

# Increase the minimum number of selectable sources required to adjust
# the system clock.
#minsources 2

# Allow NTP client access from local network.
#allow 192.168.0.0/16

# Serve time even if not synchronized to a time source.
#local stratum 10

# Specify file containing keys for NTP authentication.
#keyfile /etc/chrony.keys

# Specify directory for log files.
logdir /var/log/chrony

# Select which information is logged.
#log measurements statistics tracking
[root@fbakirpomd4 bin]# systemctl enable chronyd
[root@fbakirpomd4 bin]# systemctl start chronyd
[root@fbakirpomd4 bin]# ps -ef | grep cronyd
root     23225 26147  0 10:11 pts/1    00:00:00 grep --color=auto cronyd
[root@fbakirpomd4 bin]# ps -ef | grep chronyd
chrony   23208     1  0 10:11 ?        00:00:00 /usr/sbin/chronyd
root     23253 26147  0 10:11 pts/1    00:00:00 grep --color=auto chronyd
[root@fbakirpomd4 bin]# chronyc tracking
Reference ID    : 0AEB6413 (ntp2.xxxxxxxxxxxxx.co.uk)
Stratum         : 2
Ref time (UTC)  : Mon Sep 23 09:11:35 2019
System time     : 0.000000041 seconds slow of NTP time
Last offset     : +0.000060960 seconds
RMS offset      : 0.000060960 seconds
Frequency       : 6.443 ppm fast
Residual freq   : -0.865 ppm
Skew            : 0.017 ppm
Root delay      : 0.000187665 seconds
Root dispersion : 0.000315763 seconds
Update interval : 1.8 seconds
Leap status     : Normal
[root@fbakirpomd4 bin]# man chkconfig
[root@fbakirpomd4 bin]# chkconfig chronyd on
Note: Forwarding request to 'systemctl enable chronyd.service'.
[root@fbakirpomd4 bin]#