Auto Scaling Groups
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Auto Scaling Groups
Auto Scaling Groups (ASGs) are a key feature in cloud platforms like AWS that help automatically manage the number of virtual machines (instances) based on demand. They ensure high availability, performance, and cost-efficiency by automatically increasing or decreasing the number of running instances.
An Auto Scaling Group contains a collection of EC2 instances treated as a logical group for scaling and management. You define a minimum, maximum, and desired number of instances. Based on your configuration and scaling policies, the group will automatically launch or terminate instances.
ASGs work with scaling policies such as:
Dynamic Scaling: Automatically adjusts capacity based on metrics (like CPU utilization, memory, or custom metrics).
Scheduled Scaling: Changes capacity at predefined times (e.g., increase at 9 AM, decrease at 6 PM).
Predictive Scaling (in AWS): Uses machine learning to forecast future traffic and scale proactively.
ASGs also integrate with load balancers, distributing traffic evenly among healthy instances. If an instance becomes unhealthy, ASG automatically replaces it to maintain desired capacity.
Benefits include:
Cost optimization (no over-provisioning)
Better application performance
High availability
Automatic recovery from failures
In short, Auto Scaling Groups automate resource management, making applications more resilient and scalable without manual intervention.
Let me know if you want this content for Azure (VMSS) or GCP (Managed Instance Groups) as well.
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