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HowTo: Verify My NTP Working Or Not

I‘ve setup an NTP (Network Time Protocol) client and/or server to manage the system clock over a network. But, how do I verify that it is working correctly?
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Linux Determine which Services are Enabled at Boot

The best protection against vulnerable software is running less software. How do I find out which services are enabled at Boot under CentOS / RHEL / Fedora Linux? How do I disable software which is not needed?
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Debian / Ubuntu Linux Install NTPD To Synchronism Clock With Internet Standard Time Servers

Q. How do I install and configure NTP ( Network Time Protocol ) daemon to keep my dedicated servers clock in sync?
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CentOS Linux Install and Configure NTP to Synchronize The System Clock

How do I install and configure NTP under CentOS Linux version 5.x or 6.x server to synchronize the system clock?
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Linux Restart NTPD Service Command

I am using Network Time Protocol daemon called NTPD on Linux operating systems. How do I restart NTPD server or service on Debian/ Ubuntu / RHEL / Red Hat / Fedora / CentOS Linux operating systems?
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