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M4 (ELB, auto scaling, Termination policy, route 53) - Coggle Diagram

- - - - Each rule specifies a target group, condition, and priority. When the condition is met, the traffic is forwarded to the target group.
      - You must define a default rule for each listener, and you can add rules that specify different target groups based on the content of the request (also known as content-based routing).
- - - - ○ Auto Scaling uses EC2 status checks to detect hardware and software issues with the
      - instances, but the load balancer performs health checks by sending a request to the instance
      - and waiting for a 200 response code, or by establishing a TCP connection (for a TCP-based
      - health check) with the instance. Use the ELB health check for your Auto Scaling group.
    - - based on schedule
    - - The health status of the instance. Set to Healthy to have the instance remain in service. Set to Unhealthy to have the instance be out of service. Amazon EC2 Auto Scaling terminates and replaces the unhealthy instance.
  - - - Target tracking scaling—Increase or decrease the current capacity of the group based on a target value for a specific metric.
      - In the case of Amazon EC2 you set the metric to be monitored by Auto Scaling and Auto Scaling does the rest.
      - If you are scaling based on a utilization metric that increases or decreases proportionally to the number of instances in an Auto Scaling group, AWS recommends that you use target tracking scaling policies. Otherwise, AWS recommends that you use step scaling policies.
      - ■ You can have multiple target tracking scaling policies for a scalable target, provided that each of them uses a different metric.
      - ■ You can also optionally disable the scale-in portion of a target tracking scaling policy
      - Step scaling—Increase or decrease the current capacity of the group based on a set of scaling adjustments, known as step adjustments, that vary based on the size of the alarm breach.
        
        Amazon EC2 Auto Scaling does not support cooldown periods for step scaling policies.
        
        Therefore, you can't specify a cooldown period for these policies and the default cooldown period for the group doesn't apply.
      - Simple scaling—Increase or decrease the current capacity of the group based on a single scaling adjustment.
- - - - ● Use the Route 53 console to register a domain name and configure Route 53 to route internet traffic to
      - your website or web application.
      - ● After you register your domain name, Route 53 automatically creates a public hosted zone that has the
      - same name as the domain.
      - ● To route traffic to your resources, you create records, also known as resource record sets, in your
      - hosted zone.
      - ● You can create special Route 53 records, called alias records, that route traffic to S3 buckets,
      - CloudFront distributions, and other AWS resources.