ycombasks

I'm a proficient PHP developer, but thus far have not dealt with anything that requires scalability or requiring to know the system--everything has been taken care of by managed hosting. Now I want to dive right in and learn everything from load balancing and web server administration to server security, scaling, performance, and troubleshooting everything when things stop working.

I know the basics of Linux (even my desktop is Ubuntu), and I've messed a lot with Apache config files, ufw firewall setup, etc, so I don't have to completely start from scratch. But I'm not sure where to go to when it comes to scaling my application (like with nginx or haproxy), performance, security. I'm looking for book recommendations or other resources that can give me the whole picture.

What I've found so far:

UNIX and Linux System Administration - seems popular on Amazon, but not sure if it'll cover everything I need as a web developer, such as scaling.

The Official Ubuntu Server Handbook (3rd Edition) - Claims to cover server setup, clustering, cloud, troubleshooting, etc, but I'm not sure if having it only Ubuntu-oriented is good.

All advice is appreciated!