46. ​​Introduction to AWS EC2 Auto Scaling

AWS EC2 Auto Scaling is one of the most powerful tools offered by Amazon Web Services (AWS) for managing server capacity. This tool allows users to configure conditions to automatically scale computing resources up or down depending on demand. In this guide, we'll dive deeper into AWS EC2 Auto Scaling and understand how it works.

What is AWS EC2 Auto Scaling?

AWS EC2 Auto Scaling is a service that helps ensure that you have the right number of EC2 instances available to handle your application workload. Based on criteria you define, AWS EC2 Auto Scaling can launch new instances when demand increases and terminate instances when demand decreases. Not only does this help keep your application performing at optimal levels, it can also reduce costs as you only pay for the EC2 instances you really need.

How does AWS EC2 Auto Scaling work?

AWS EC2 Auto Scaling works with Auto Scaling groups, which are collections of EC2 instances. When you create an Auto Scaling group, you define a minimum and maximum number of instances that can exist in the group. You also set a target number of instances, which is the number of instances Auto Scaling will try to keep in the group.

Once you define these numbers, you can configure escalation policies. These policies determine when Auto Scaling should launch or terminate instances. For example, you can create a policy that launches a new instance when the average CPU utilization of all instances in the group exceeds 70%. Similarly, you can create a policy that terminates an instance when the average CPU utilization drops below 20%.

Benefits of AWS EC2 Auto Scaling

There are many benefits to using AWS EC2 Auto Scaling. Here are some of the most significant:

• Improved performance: With Auto Scaling, you can ensure you always have the right number of EC2 instances to meet demand. This can result in improved application performance as users won't have to deal with slow load times or crashes due to server overload.
• Cost Reduction: Auto Scaling can help reduce your AWS costs by only paying for the EC2 instances you really need. If demand drops, Auto Scaling can terminate unnecessary instances so you aren't paying for unused resources.
• Increased Availability: Auto Scaling can increase the availability of your application by launching new instances in case of failure of an existing instance. This can be especially useful for critical applications that cannot afford downtime.

Configuring AWS EC2 Auto Scaling

Setting up AWS EC2 Auto Scaling involves several steps. First, you need to create an Auto Scaling group. During this process, you define the minimum, maximum, and desired number of instances, as well as any scaling policies.

Next, you need to create a release template, which is a specification for new instances. This template can include instance type, Amazon Machine Image (AMI), volume size and other settings.

Finally, you need to associate your Auto Scaling group with your release template. Once you've done that, Auto Scaling can start launching and terminating instances based on your scaling policies.

In summary, AWS EC2 Auto Scaling is a powerful tool for managing server capacity. It can improve performance, reduce costs, and increase availability, making it a valuable addition to your AWS strategy.

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