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The importance of properly partitioning a disk in Linux

03-15-2016 GNU/Linux, Security 3 comments

Linux disk partition I am a strong supporter of simplicity and the principle that less is more, but as far as security and performance of information systems is concerned, we must be able to strike a balance between keeping things simple and exposing ourselves as little as possible to potential threats while trying to obtain the maximum performance of all system elements involved.

It is a common practice that the various distributions of Linux, and even the images used to launch Linux virtual server instances as in the case of AWS AMI’s, implement by default an extremely simple partitioning scheme consisting in a single partition that covers the entire disk. It is in this only partition where the root filesystem (/) is mounted and in which all the directories that configure the file hierarchy of a Linux operating system are placed.

But one of the features of Linux is precisely that it allows you to be highly flexible in placing each of these directories on different partitions or on different disks if necessary.

Differences between physical CPU vs logical CPU vs Core vs Thread vs Socket

02-12-2015 DevOps 12 comments

When we try to know a computer’s architecture and performance at CPU level using Linux commands like nproc or lscpu, we often find out that we are not able to properly interpret their results because we confuse terms such as physical CPU, logical CPU, virtual CPU, core, thread, socket, etc. If we add concepts like HyperThreading (not to be confused with multithreading), we are in a situation where we can not be sure how many cores our box has, we don’t understand why commands like htop indicate that we have 8 cpus when we thought we had bought a single quad-core processor, etc. In short, it’s a mess.

15 most useful Linux commands for file system maintenance

10-01-2014 GNU/Linux, Tips & Tricks 5 comments

One of the most common and tedious tasks of a sysadmin is to prevent file systems become completely full, because when a server runs out of space the consequences are unpredictable. Depending on how you structured the root file system and if it is divided into different partitions or volumes, those consequences will be more or less severe, but in any case undesirable.

Still unresolved Shellshock major vulnerability affecting Bash on Linux, Unix and MAC OS X

09-26-2014 GNU/Linux, Security, Tech News No comments

Less than two days after it was detected a vulnerability (CVE-2014-6271) that affects the Bash shell on Linux, Unix and Mac OS X, a patch was released that solves this issue only partially, which forced to report a new vulnerability (CVE-2014-7169) still pending. This issue has quickly gained a simple name by which it will be remembered for a long time: Shellshock or Shell Shock.

5 most important reasons to increase your website’s loading speed

09-24-2014 SEO - Website Optimization, WPO - Website Optimization No comments

It’s common not to pay much attention to website loading speed as long as it remains between more or less acceptable levels wich don’t make us waiting forever for content. However, web speed is becoming an increasingly important factor and optimization efforts in this area can be decisive for success or failure in achieving our goals.

Below are the top 5 reasons why you should start worrying about website speed and page loading times.

5 ways to combat your sedentary work

09-22-2014 R&D and Innovation No comments

For all it’s well known that physical inactivity is bad for health. But not everyone knows how harmful it is, even having reached the rank of a pandemic in this century according to numerous studies. Any person staying long hours sitting in front of a computer while working knows that this causes many inconvenience over time, whether back, shoulders or neck pain, and of course weight gain and overall deterioration of physical condition. In addition there is increasing evidence from numerous studies that sitting long hours on the same position increases up to 50% the chances of developing cardiovascular disease and even various forms of cancer.

What is Web Architecture?

09-17-2014 Reflections No comments

Technology Architecture

Before you can get to define what web architecture is, first it is necessary to frame it properly. There are some roles related to architecture within the Information Technology industry, but basically we can do the following division:

Fixing Qtranslate slug problems

09-16-2014 Troubleshooting 5 comments

There are basically two options when creating a multi-language website based on WordPress. One involves duplicating posts and pages by creating one different post for each language, wich is the approach followed by some plugins like WPML, Polylang or xili-language. Another approach is to introduce all the translations into the same post, separated by meta-tags within the content itself.

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