Auto scaling

 Amazon EC2 Auto Scaling

Amazon EC2 Auto Scaling helps you ensure that you have the correct number of Amazon EC2 instances available to handle the load for your application. You create collections of EC2 instances, called Auto Scaling groups. You can specify the minimum number of instances in each Auto Scaling group, and Auto Scaling ensures that your group never goes below this size. You can specify the maximum number of instances in each Auto Scaling group, and Auto Scaling ensures that your group never goes above this size.

For example, the following Auto Scaling group has a minimum size of 1 instance, the desired capacity of 2 instances, and a maximum size of 4 instances. The scaling policies that you define adjust the number of instances, within your minimum and a maximum number of instances, based on the criteria that you specify.

Graphic 2

Go to Amazon Console and check for EC2

On the left panel get top Auto scaling Group

Go to "Create autos Scaling Group

 Choose the first one

Choose the free tier

we name it "first-launch-config"  them go to skip to review

we will check from one of the existing  security group

we will choose one of our existing keys

We will call our first Auto  Scaling group " first-ASG" and we will choose a default subnet

Check for a review of the configuration

You could verify that there is our Auto scaling group

Go  to instances on the left panel ..check if they are  running properly

 verification
Once it has been created we can delete it as well on the action tab

we can see that it's terminated

One is running, the second one is terminated

Now we can check on history tab, AWS Auto Scaling

In action tab, we can delete that one as well.. and check the desired, Min and Max tab.

Please check graphic 2 at the beginning of this tutorial

delete confirmation

check on Desired, Min and Max tab

deleted confirmation