start up chronyd

# systemctl start chronyd

[root@studentvm1 ~]# systemctl restart chronyd

-- create simple table SQL

CREATE TABLE countries( 
COUNTRY_ID varchar(2),
COUNTRY_NAME varchar(40),
REGION_ID decimal(10,0)
);

# chronyc tracking
Reference ID : 192.0.2.1 (192.0.2.1) 
Stratum : 12
Ref time (UTC) : Fri Aug 05 19:06:51 2016
System time     : 0.000823375 seconds fast of NTP time
Last offset     : 0.001989304 seconds
RMS offset      : 0.060942811 seconds
Frequency       : 1728.043 ppm slow
Residual freq   : 1.100 ppm
Skew            : 94.293 ppm
Root delay	    : 0.000207 seconds 
Root dispersion : 0.016767 seconds
Update interval : 65.1 seconds
Leap status     : Normal