49 lines
1.7 KiB
Markdown
49 lines
1.7 KiB
Markdown
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## AWS Auto Scaling Groups - Basics
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### Requirements
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Zero EC2 instances running
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### Objectives
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A. Create a scaling group for web servers with the following properties:
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* Amazon Linux 2 AMI
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* t2.micro as the instance type
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* user data:
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```
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yum install -y httpd
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systemctl start httpd
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systemctl enable httpd
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```
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B. Were new instances created since you created the auto scaling group? How many? Why?
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C. Change desired capacity to 2. Did it launch more instances?
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D. Change back the desired capacity to 1. What is the result of this action?
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### Solution
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#### Console
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A.
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1. Go to EC2 service
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2. Click on "Auto Scaling Groups" under "Auto Scaling"
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3. Click on "Create Auto Scaling Group"
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4. Insert a name
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5. Click on "Create a launch template"
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1. Insert a name and a version for the template
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2. Select an AMI to use (Amazon Linux 2)
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3. Select t2.micro instance type
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4. Select a key pair
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5. Attach a security group
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6. Under "Advanced" insert the user data
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7. Click on "Create"
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6. Choose the launch template you've just created and click on "Next"
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7. Choose "Adhere to launch template"
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8. Choose in which AZs to launch and click on "Next"
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9. Link it to ALB (if you don't have one, create it)
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10. Mark ELB health check in addition to EC2. Click on "Next" until you reach the review page and click on "Create auto scaling group"
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B. One instance was launched to met the criteria of the auto scaling group we've created. The reason it launched only one is due to "Desired capacity" set to 1.
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C. Change it by going to your auto scaling group -> Details -> Edit -> "2 desired capacity". This should create another instance if only one is running
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D. Reducing desired capacity back to 1 will terminate one of the instances (assuming 2 are running).
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