And so the plot thickens. Hands down, China is flexing its muscles in the South China Sea. It is gobbling-up maritime features left and right. Littoral states, friendly or not to them, are no longer turning a blind eye. Things are getting out of hand. And with the (1) intentional ramming and sinking of boats; (2) water cannon forays; (3) burning and looting of Chinese factories in Vietnam; (4) killing of Chinese nationals also in Vietnam; (5) USA’s Asian Pivot; (6) incarceration of eleven Chinese poachers in Half Moon Bay by Philippine Maritime Forces; (7) brazen installation of an oil rig in the Paracels; (8) construction of an unsinkable aircraft carrier / airstrip in the Mabini reef; (9) continued air and sea stand-off in the Senkaku/Diayou island chain; (10) harassment of Philippine troops stationed at the Ayungin shoal; (11) abduction of two Chinese nationals in Sabah, Malaysia, allegedly by the Abu Sayaff; (12) and China’s bellicose statements in its state-run media, a global war is not far off.
Month: May 2014
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.
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.
Nowadays, 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.
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.