Month: February 2017

How to optimize images from command line

Published by tex on February 26, 2017

I’m using the following tools to perform lossless image compression: jpegoptim – jpegoptim is a utility for optimizing JPEG files. It provides lossless optimization (based on optimizing the Huffman tables) and “lossy” optimization based on setting a maximum quality factor. optipng – OptiPNG is a PNG optimizer that recompresses the image files to a smaller…

Tuning Apache ListenBackLog

Published by tex on February 14, 2017

What is ListenBackLog? The maximum length of the queue of pending connections. Generally no tuning is needed or desired, however on some systems it is desirable to increase this when under a TCP SYN flood attack. See the backlog parameter to the listen(2) system call. This will often be limited to a smaller number by…