Exploring AWS !!
Day 12:
Autoscaling:
Scaling is adding/removing capacity/resource as needed.
Scale out is adding, scale in is removing.
Types: vertical and horizontal
Autoscaling is automatically scaling in/out.
Ensures correct number of instances are available to handle load.
Multi-Az EC2 instances provide high availability solution.
Autoscaling can dynamically increase/decrease capacity as needed.
Components:
Groups: EC2 instances are in groups so that they can be considered as a logical unit (for scaling and management). When we create groups we mention following attributes: min, max and desired number of instances.
Configuration Templates: used as config templates for EC2 instances. Launch template or launch configuration is also used.
Scaling options: Autoscaling provides several ways to scale group.
Manual scaling, Dynamic scaling, Scaling based on demand or schedule.
Scaling Policy:
Increase 2 instances at a time.
Decrease 1 instance at a time.
Alarm:
If CPU Utilization > 80% or more than 10 mins, ring bell.
Min capacity: 2
Desired capacity: 4
Max capacity: 10
Cool Down Period: ensures that auto scaling does not launch or terminate any instance until a specified period is completed. Scaling activity is suspended until cool-down period is in effect.
Step Scaling:
Alarm: CPU > 60% >60%/2
Action Add 2 instances >75%/3
The diagram represents the Lifecycle of Autoscaling.
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