configuring-Auto-scaling-with-ALB-using-launch-template.md

Configuring Auto scaling with ALB using launch template

Task 1: Create Launch Template

Step 1: Log in to the AWS Management Console

• Open your web browser and go to AWS Management Console.
• Enter your AWS account credentials (username and password) and click on "Sign In."

Step 2: Navigate to the EC2 Service

• In the AWS Management Console, find the "Services" dropdown menu located at the top of the page.
• Select "EC2" from the list of services.

Step 3: Access Launch Templates

• In the EC2 dashboard, look at the left navigation pane.
• Click on "Launch Templates" under the "Instances" section.

Step 4: Create a New Launch Template

• Click the "Create launch template" button located at the top of the Launch Templates page.

Step 5: Configure the Launch Template Settings

• Template Name: Enter a unique name for your launch template.
• Template Version Description: Provide a description.
• Amazon Machine Image (AMI): Choose an AMI from the list or enter the AMI ID.

  Create an AMI

 Step 1: Navigate to the EC2 Service
- In the AWS Management Console, find the "Services" dropdown menu located at the top of the page.
- Select "EC2" from the list of services.

 Step 2: Choose an Instance to Create the AMI From
- In the EC2 dashboard, click on "Instances" in the left navigation pane.
- Select the instance you want to create an AMI from.

 Step 3: Create the AMI
- With the instance selected, click on the "Actions" dropdown menu.
- Choose "Image and templates" and then "Create Image."

 Step 4: Configure the AMI Settings
- **Image Name:** Enter a unique name for your AMI.
- **Image Description (Optional):** Provide a description for the AMI.
- **No Reboot:** Decide whether to enable the "No Reboot" option. If unchecked, the instance will be stopped and rebooted to ensure a clean image.
- **Instance Volumes:** Review and configure the root volume and any additional volumes to be included in the AMI.
- Click the "Create Image" button to start the creation process.

 Step 5: Monitor the AMI Creation Process
- In the left navigation pane, click on "AMIs" under the "Images" section.
- You can monitor the status of your AMI in the AMIs dashboard. Once the status changes to "available," your AMI is ready to use.

Step 6: Navigate back to the Launch template

• Instance Type: Select the desired instance type (e.g., t2.micro).
• Key Pair: Choose an existing key pair or create a new one for SSH access.
• Network Settings: Configure VPC, subnet, and other networking options.
• Security Groups: Select one or more security groups.
• Storage (Volumes): Configure the root volume and any additional volumes.
• Advanced Details:
  • User Data: Enter any user data scripts or cloud-init directives to run on instance launch.
  • IAM Role: Assign an IAM role if necessary.
  • Monitoring, Tenancy, etc.: Configure additional settings as needed.
• After configuring all necessary settings, click the "Create launch template" button at the bottom of the page to save your template.

Task 2: Set Up Auto Scaling Group

Step 1: Navigate to Auto Scaling Groups

• In the EC2 dashboard, look at the left navigation pane.
• Click on "Auto Scaling Groups" under the "Auto Scaling" section.

Step 2: Create a New Auto Scaling Group

• Click the "Create Auto Scaling group" button located at the top of the Auto Scaling Groups page.

Step 3: Choose a Launch Template

• Select the "Use Launch Template" option.
• From the dropdown menu, choose the launch template you created previously.

Step 4: Configure Auto Scaling Group Settings

• Group Name: Enter a unique name for your Auto Scaling group.
• Launch Template Version: Select the appropriate version of the launch template if applicable.
• Desired Capacity: Specify the initial number of instances you want running in this group.
• Minimum Capacity: Set the minimum number of instances the group should maintain.
• Maximum Capacity: Set the maximum number of instances the group can scale out to.

Step 5: Set Up Additional Configurations

• Network Settings:

  • Select the VPC where your instances will be launched.
  • Choose one or more subnets within the selected VPC for the instances.

• Load Balancing (Optional):

  • If you have a load balancer, choose whether to attach it to your Auto Scaling group.

• Scaling Policies:

  • Configure policies to define how your Auto Scaling group scales in and out.
  • Select Target tracking scaling policy
  • Choose a CloudWatch metric and target value and let the scaling policy adjust the desired capacity in proportion to the metric's value.

• Instance Protection (Optional): Enable instance protection to prevent specific instances from being terminated during a scale-in event.

• Health Checks:

• Add a notification (optional)

• Set the health check grace period.

• After configuring all necessary settings, click the "Create Auto Scaling group" button at the bottom of the page to finalize the setup.

Task 5: Test Auto Scaling

Step 1: Generate Traffic to Trigger Scaling Policies

• Connect to one of the instances in your Auto Scaling group using SSH.
• Install the necessary tools to generate CPU stress.

sudo amazon-linux-extras install epel -y
sudo yum install stress -y