Servers for Hackers: Newsletter with server management tips for programmers

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http://serversforhackers.com/

From the signup page:

At some point, every programmer finds themselves needing to know their way around a server.
Servers for Hackers is a newsletter for those times.

This newsletter will cover things like user management and permissions, firewalls, LAMP stacks, apache, nginx, load balancers, proxies, nodejs, ruby, python, php, search engines, automating processes, handling log files, git, deployment, sql, nosql, development environments, provisioning, the list can go on forever!