Convert decimal to hex in Bash?
A quicky for my archives: convert decimal to hex in Bash, and convert hexadecimal to decimal, in Bash. In mathematics and computing, hexadecimal (also base 16, or hex) is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0-9 to represent values zero to nine, and A, B, C, D, E, F (or alternatively a-f) to represent values ten to fifteen. If you want to convert hexadecimal values to decimal and decimal values to hexadecimal, here's how. All on the bash prompt...
Sysadmins of the North goes global!
How to set up a global Geolocation DNS load balancing Varnish Cache Content Delivery Network with Bind9, geo-ip database, Varnish Cache and DigtalOcean. DIY High-Availability for your website!
How to set a good PHP realpath_cache_size
The PHP directive realpath_cache_size sets the size of the realpath cache to be used by PHP. Increasing realpath_cache_size might greatly improve PHP performance, as PHP states: "This value should be increased on systems where PHP opens many files.". Therefore, setting a correct value for PHP realpath_cache_size can greatly improve PHP performance and optimize WordPress - and other CMS's - websites.