CentOS7 set up NTP server

Ntp server set up

1. Check the server, the client operating system version
   
   2 see if a server is installed ntp
   
   3 if not installed
   
   after the installation is complete 4 again to see whether the server is installed ntp
   
   5 View ntp server status
   
   6 modify the configuration file
   
   comments
   #server 0.centos.pool.ntp.org iBurst
   #server 1.centos.pool.ntp.org iBurst
   #server 2.centos.pool.ntp.org iBurst
   #server 3.centos.pool.ntp.org iBurst
   Add
   Server 127.127.1.0 iBurst
   7 start ntp service
   
   8 view status
   
   9 Check whether to synchronize
   
   10 added post launch
   
   11 view firewall status (I need to deploy the daily program, disable the firewall)
   
   12 View firewall ports open