1. ELB
   1. What?
      1. Elastic Load Balancing
      2. Distribute traffic among EC2 instances
   2. Why?
      1. Maintain HA
      2. Endpoint before instances (incoming traffic can only hit ELB load balancer)
      3. Health check of instances behind the load balancer
   3. Types
      1. Internet-facing
      2. Internal
         1. Load balance between the tiers of the application.
      3. HTTPS
         1. SSL offload (encrpted connection)
2. CloudWatch
   1. What?
   2. Why?
      1. Work with Auto Scaling
      2. Visibility
   3. Monitoring types
      1. Basic (default)
         1. Send data every 5 minutes (free)
      2. Detailed (cost $)
3. Auto Scaling
   1. What is it?
      1. Sale EC2 capacity (scale in or out) according to defined criteria
      2. Comprise
         1. Plan
            1. Maintain current instance levels
            2. Manual scaling
            3. Scheduled scaling
            4. Dynamic scaling
         2. Lauch configuration (template)
         3. Auto Scaling Group
         4. Scaling policy (wether to scale in or out)
   2. Why?
      1. Provision virtual servers on demand
      2. Maintain availability
      3. Big cost-saving
      4. Deal with traffic hikes, unhealthing or failing instances