Chapter 5: Amazon EC2 (Elastic Compute Cloud)
5.5 Elastic IP (static public IP)
EC2 console → Network & Security → Elastic IPs → Allocate Elastic IP address → Allocate
Select the EIP → Actions → Associate Elastic IP address → choose instance → Associate
To remove: Disassociate, then Release (otherwise you keep paying for it). For the full story — charges, the 5-per-region limit, and replacing a server without changing DNS — see Chapter 14, section 14.1. To give the Elastic IP a domain name, see Chapter 9.