Webpage speed measuring tools
You have probably heard, that Google will include page access time into page ranking calculation. Basically – faster your page loads – better rank you […]
Continue reading »How to find biggest subfolder
This little command will give you list of folders, sorted by their size: du -sk * | sort -nr | more
Continue reading »Only allow to view images from a folder with simple .htaccess file
Once in a while my beloved hackers upload their shitty files into image folder (basically they use some plugin for image upload). In most cases […]
Continue reading »How to flush RAM on Linux / Centos
I personally suggest using first option, other are more and more “hardcore”. Also I would not suggest doing this under high CPU load or high […]
Continue reading »How to test your SSL certificate
Some people might think, that if webpage has SSL certificate – it is 100% safe to browse it. Website owners might think, that having SSL […]
Continue reading »Set folder to readonly mode in Linux
Very often, when website is hacked – we do clean it for customer, because we do not want to have hacked content on our servers. […]
Continue reading »Find modified and hacked files
Finding files, uploaded and left by hackers, as well as files, which they have modified, is a complex event. It might be enough with one […]
Continue reading »Optimizing MySQL, Intermediate results
In the past few weeks we’ve been looking into different MySQL configuration options and were running many simple tests. Even though all tests were different […]
Continue reading »Optimizing MySQL, part 3, mysql cache
In this part we are targeting MySQL cache. On most of our shared-hosting servers more than 50% of all queries are served by MySQL cache. […]
Continue reading »Optimizing MySQL, part 2
Today I wrote new tests. Today tests are targeting 3 large tables, containing from 100’000 to 1’700’000 records. We do huge number of random selects […]
Continue reading »