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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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CentOS 6.5 Configuration Tips

By far, Linux (Centos) is the most robust server system that any decent IT guy can ask for. It is secure and very flexible. In the server management world, its vast user base can attest to its quality. However, Linux installation and configuration is not without challenges. But all tips and workarounds are on the Internet, so the problem is not a function of difficulty, but time.

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QR Codes in Time and Attendance Applications

QR Codes or “Quick Response Codes” are ubiquitous. They can be seen everywhere and in myriads of aesthetic variations. However, they exist for one purpose and one purpose alone: data storage. Among others, QR codes contain (1) website URLs that triggers browsers to go to that website; (2) phone numbers and business cards that automatically get stored in mobile phones; and (3) inventory codes that let business owners track and manage assets they own.

A QR Code is easy to read. It does not require any specialized equipment to capture its encoded content. It only needs a computer with a camera attached to it. In this regard, any smart phone, laptop, or tablet with a QR Code reader App can be used. Moreover, QR Codes contain more data than the standard UPC barcodes. Further, and most importantly, QR Codes can be read faster than traditional encoded badges.

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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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