Table of Contents
- 1 What might be the cause of an EC2 instance not launching in an Auto Scaling group?
- 2 What is cooldown period in Auto Scaling group?
- 3 What is Auto Scaling what triggers have you used for scaling?
- 4 What must you ensure that Auto Scaling is checking so that instances in your Auto Scaling group are properly marked as unhealthy?
- 5 How do I make an Auto Scaling group in AWS?
- 6 What is the benefit of Auto Scaling?
- 7 What is the maximum length of AWS EC2 auto scaling roles?
- 8 How many instances can I have in my EC2 auto scaling group?
What might be the cause of an EC2 instance not launching in an Auto Scaling group?
Cause: The instance type you chose might not be currently available in the Availability Zones specified in your Auto Scaling group. Solution: Update your Auto Scaling group with the recommendations in the error message.
What is cooldown period in Auto Scaling group?
The cooldown period is a configurable setting for your Auto Scaling group that helps to ensure that it doesn’t launch or terminate additional instances before the previous scaling activity takes effect. The default cooldown period is applied when you create your Auto Scaling group. The default value is 300 seconds.
Which AWS resource is required when creating an Auto Scaling group?
Amazon EC2 instance
Creating an Auto Scaling group might require that you configure and provision an Amazon EC2 instance first. For example, you might want to test that everything works the way that you intend. Multiple properties are required to create an EC2 instance, such as the AMI ID, instance type, key pair, and security group.
What is the purpose of an Amazon Auto Scaling group?
An Auto Scaling group contains a collection of Amazon EC2 instances that are treated as a logical grouping for the purposes of automatic scaling and management. An Auto Scaling group also enables you to use Amazon EC2 Auto Scaling features such as health check replacements and scaling policies.
What is Auto Scaling what triggers have you used for scaling?
The Auto Scaling group in your Elastic Beanstalk environment uses two Amazon CloudWatch alarms to trigger scaling operations. The default triggers scale when the average outbound network traffic from each instance is higher than 6 MB or lower than 2 MB over a period of five minutes.
What must you ensure that Auto Scaling is checking so that instances in your Auto Scaling group are properly marked as unhealthy?
The default health checks for an Auto Scaling group are EC2 status checks only. To ensure that your Auto Scaling group can determine instance health based on additional load balancer tests, configure the Auto Scaling group to use Elastic Load Balancing ( ELB ) health checks.
How fast is AWS Auto Scaling?
Q: How long is the turn-around time for Amazon EC2 Auto Scaling to spin up a new instance at inService state after detecting an unhealthy server? The turnaround time is within minutes. The majority of replacements happen within less than 5 minutes, and on average it is significantly less than 5 minutes.
What is lifecycle hook in AWS?
Lifecycle hooks allow you to control what happens when your Amazon EC2 instances are launched and terminated as you scale out and in. For example, you might download and install software when an instance is launching, and archive instance log files in Amazon Simple Storage Service (S3) when an instance is terminating.
How do I make an Auto Scaling group in AWS?
Open the Amazon EC2 Auto Scaling console at https://console.aws.amazon.com/ec2autoscaling/ .
- On the navigation bar at the top of the screen, choose the same Region that you used when you created the launch template.
- Choose Create an Auto Scaling group.
What is the benefit of Auto Scaling?
Autoscaling allows servers to go to sleep during times of low load, saving on electricity costs for companies running their own web server infrastructure. Autoscaling can lower bills, because most cloud providers charge based on total usage rather than maximum capacity for infrastructure hosted in the cloud.
Why do we need Auto Scaling?
How do I create an auto scaling group in AWS?
To create an Auto Scaling group using a launch configuration (console) Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/. On the navigation bar at the top of the screen, choose the same AWS Region that you used when you created the launch template. On the navigation pane, under AUTO SCALING, choose Auto Scaling Groups.
What is the maximum length of AWS EC2 auto scaling roles?
Maximum length of 255. The Amazon Resource Name (ARN) of the service-linked role that the Auto Scaling group uses to call other Amazon Web Services on your behalf. By default, Amazon EC2 Auto Scaling uses a service-linked role named AWSServiceRoleForAutoScaling, which it creates if it does not exist.
How many instances can I have in my EC2 auto scaling group?
You can have as many instances in your EC2 Auto Scaling group as your EC2 quota allows. Q: What happens if a scaling activity causes me to reach my Amazon EC2 limit of instances? Amazon EC2 Auto Scaling cannot scale past the Amazon EC2 limit of instances that you can run.
What is ASG in Amazon EC2 auto scaling?
Amazon EC2 Auto Scaling will automaticallly adjust the number of instances in the group to maintain a fixed number of instances even if a instance becomes unhealthy, or based on criteria that you specify. You can find more information about ASG in the Amazon EC2 Auto Scaling User Guide. Q: What happens to my Amazon EC2 instances if I delete my ASG?