ASG (Auto Scaling Groups)
by Roberto Manuel Rojas Parra
1. Free of Cost
2. Attributes
2.1. Launch Configuration
2.1.1. AMI + Instance Type
2.1.1.1. assigned to EC2
2.1.2. EC2 User Data
2.1.3. EBS Volumes
2.1.4. Security Groups
2.1.5. SSH Key Pair
2.2. min/max size, initial capacity
2.3. Network + Subnets Info
2.4. LB Information
2.5. Scaling Policies
2.5.1. Rules
2.5.1.1. avg cpu usage
2.5.1.2. requests on ELB per instance
2.5.1.3. Average in Network in/out
2.5.2. Auto scaling Alarms (Cloud Watch)
2.5.3. Custom Metric
2.5.3.1. send to cloud watch - create alarm - use in policy
3. Why
3.1. Scale out
3.1.1. register EC2 to LB