The following tutorials by Philip Knerr cover various aspects of DevOps and server configuration. Enjoy!
Basic configuration for general purpose Amazon EC2 instances
Creating a swap file on an Amazon EC2 instance
Installing Node.js and npm on an Amazon EC2 instance
Upgrading the Ruby language on an Amazon EC2 instance
Installing the LAMP stack on an Amazon EC2 instance
Creating new users on an Amazon EC2 instance
Granting superuser access on an Amazon EC2 instance
Disabling the ec2-user account on an Amazon EC2 instance