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Tag: CentOS

Synchronize CentOS System Clock with Network Time Protocol (NTP)

Synchronize CentOS System Clock with Network Time Protocol (NTP)
Computers, like any digital device, have clocks in them. Aside from telling users the time, they also provide a sequencing mechanism for internal core functions and digital circuitry. However, sometimes these clocks malfunction. It might be because of a bad CMOS battery or a timezone mix-up. Fortunately, CentOS, or any Linux box for that matter, have a tool that synchronizes its clocks with central servers.

The Network Time Protocol (NTP) is such a tool. It functions as an initial configuration setter and auto updater for Linux or CentOS boxes.

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How to Purge Linux’s Cached Memory

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If like me, you manage your own Linux servers, it is essential to know how to release its cached memory. In a nutshell, Linux always tries to use RAM to speed up disk operations. It uses available memory for buffers (file system metadata) and cache (pages with actual contents of files or block devices). This helps the system to run faster because disk information is already in memory which saves I/O operations. If space is needed by programs or applications like MySQL, Linux will free the buffers and cache to provide memory where it is needed.

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