Instance Refresh
Instance Refresh is a feature that allows you to update or replace the instances in your Auto Scaling group, ensuring they are running the most recent launch configurations and scaling policies. It is often used during application deployments, to perform rolling updates, or to apply software patches without causing downtime. This is done by gradually replacing instances with new ones, ensuring a smooth transition and maintaining the desired capacity throughout the process. You can control the refresh strategy by specifying the percentage of instances to replace at a time, and the minimum duration to wait between two such replacements.
AWS Solution Architect: Auto Scaling instance Refresh Guide
An AWS Auto Scaling instance refresh is a feature that allows you to update the instances in your Auto Scaling group to use the latest launch template and launch configuration. It performs a rolling replacement of all the instances in the Auto Scaling group.
Importance: Instance Refresh is used to apply a new launch configuration or launch template for your instances without manual intervention. It helps in maintaining the health and performance of your application as you can have all instances running the latest configuration. It's especially vital for large scale applications.
How It Works: Instance Refresh works by terminating an instance and then creating a new one using the new launch template or configuration. It first moves the instances to a standby state to detach it from the load balancer, then terminates, creates the new instance and reattaches to the load balancer.
Exam Tips – Answering Questions on Instance Refresh:
- Understanding the sequence of steps during an instance refresh is key.
- The difference between a launch configuration and launch template.
- Understand that it detaches the instances before termination and reattaches after creating new instances.
- Refresh is not instantaneous and may result in some downtime depending on your configurations.
- The feature is crucial for maintaining instance health and up-to-date configurations.
Go Premium
AWS Certified Solutions Architect - Associate Preparation Package (2024)
- 2203 Superior-grade AWS Certified Solutions Architect - Associate practice questions.
- Accelerated Mastery: Deep dive into critical topics to fast-track your mastery.
- Unlock Effortless AWS Certified Solutions Architect preparation: 5 full exams.
- 100% Satisfaction Guaranteed: Full refund with no questions if unsatisfied.
- Bonus: If you upgrade now you get upgraded access to all courses
- Risk-Free Decision: Start with a 7-day free trial - get premium features at no cost!