=====Setting up NTP=====

====Initial setup====

NTP is installed by default in Linux 6 and 7

Main config file is **/etc/ntp.conf**

====Making Sure its Running====
THings have changed a bit 
**RHEL 6 and older**
  chkconfig ntpd on
  service ntpd start
  
**RHEL 7**
  systemctl enable ntpd
  systemctl status ntpd

==== Testing Troubleshooting====

Checking if ntp server is available  from the machine

  ntpdate -q ip-address|name of NTP server
  
once you verified it you can use 

  ntpdate ip-address|name of NTP server

To set up time

You can check it with 

  ntpq -p
  ntpstat

To quickly synchronize the servers  
  # systemctl stop ntpd
  # ntpdate 10.5.6.11
  5 Jul 10:36:58 ntpdate[2190]: adjust time server 95.81.173.74 offset -0.005354 sec
  # systemctl start ntpd
====Firewall settings====

^  Port  ^  Protocol  ^
|  123  |  UDP   |

[[https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/s1-Configure_the_Firewall_to_Allow_Incoming_NTP_Packets.html | Setting Firewall in RHEL 7]]