Online Learning Resources

Just a few quick links for increasing your skill set in a number of areas.

MIT Open Courseware “The idea is simple: to publish all of our course materials online and make them widely available to everyone.”
Dick K.P. Yue, Professor, MIT School of Engineering

Stanford Lagunita Lagunita hosts many of the free, online courses that are taught by Stanford faculty and made available to lifelong learners around the world for self-enrichment.

Khan Academy Our mission is to provide a free, world‑class education for anyone, anywhere.

Alison Free online courses from the world’s leading experts.

Wikiversity Wikiversity is a Wikimedia Foundation project devoted to learning resources, learning projects, and research for use in all levels, types, and styles of education from pre-school to university, including professional training and informal learning.

PHP-FPM and mixed web apps.

In attempting to satisfy requirements for a NextCloud installation, I found that other sites on the same server failed to load. After some head scratching I found the issue. The following snippet is from the corresponding Nginx conf file recommended in the NextCloud documentation.

upstream php-handler {
    #server unix:/var/run/php/php7.2-fpm.sock;

The corresponding changes made in /etc/php/7.3/fpm/pool.d/www.conf, specifying an ip address and port for the php-handler to listen.

;listen = /run/php/php7.3-fpm.sock
listen = 9000

This killed the other sites’ php connection and ended in 502 errors, as their Nginx conf files were expecting an absolute path. Changing the conf file for the NextCloud installation allowed all to coexist.

upstream php-handler {
    # server;
    server unix:/var/run/php/php7.3-fpm.sock;

And the corrected /etc/php/7.3/fpm/pool.d/www.conf;

listen = /run/php/php7.3-fpm.sock
;listen = 9000