{"id":91,"date":"2025-06-09T12:54:49","date_gmt":"2025-06-09T11:54:49","guid":{"rendered":"https:\/\/blog.mkcloudai.com\/?p=91"},"modified":"2025-06-09T12:54:49","modified_gmt":"2025-06-09T11:54:49","slug":"scaling-smart-ec2-autoscaling-terraform-and-secrets-manager-in-aws","status":"publish","type":"post","link":"https:\/\/blog.mkcloudai.com\/?p=91","title":{"rendered":"Scaling Smart: EC2 Autoscaling, Terraform, and Secrets Manager in AWS"},"content":{"rendered":"\n<p>In the last post, we deployed a secure, scalable AWS architecture for a restaurant booking app using EC2, RDS, and CloudWatch. Now let\u2019s take it further:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd04 <strong>Auto Scaling EC2 Instances<\/strong><\/li>\n\n\n\n<li>\u2699\ufe0f <strong>Infrastructure as Code with Terraform<\/strong><\/li>\n\n\n\n<li>\ud83d\udd10 <strong>Secrets Manager for Secure Configs<\/strong><\/li>\n<\/ul>\n\n\n\n<p>This final layer turns your setup into a <strong>production-grade cloud-native app<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd04 1. Auto Scaling EC2 Instances<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd39 Why It Matters<\/h3>\n\n\n\n<p>Your app should automatically handle more traffic and recover from failure \u2014 even when you&#8217;re asleep.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 What We\u2019ll Do<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Create an <strong>Auto Scaling Group (ASG)<\/strong><\/li>\n\n\n\n<li>Attach to <strong>Application Load Balancer (ALB)<\/strong><\/li>\n\n\n\n<li>Use <strong>Launch Templates<\/strong> for consistency<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd27 Steps<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Create Launch Template<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>aws ec2 create-launch-template \\\n  --launch-template-name web-app-template \\\n  --version-description v1 \\\n  --launch-template-data file:\/\/lt-config.json<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Create Auto Scaling Group<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>aws autoscaling create-auto-scaling-group \\\n  --auto-scaling-group-name web-app-asg \\\n  --launch-template LaunchTemplateName=web-app-template,Version=1 \\\n  --min-size 2 --max-size 5 --desired-capacity 2 \\\n  --vpc-zone-identifier subnet-xxxxxx,subnet-yyyyyy \\\n  --target-group-arns arn:aws:elasticloadbalancing:...<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Add Scaling Policy (CPU-Based)<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>aws autoscaling put-scaling-policy \\\n  --auto-scaling-group-name web-app-asg \\\n  --policy-name cpu-scale-up \\\n  --policy-type TargetTrackingScaling \\\n  --target-tracking-configuration file:\/\/cpu-scaling-config.json<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u2699\ufe0f 2. Infrastructure as Code with Terraform<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd39 Why It Matters<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Avoid manual configuration<\/li>\n\n\n\n<li>Reproducible and version-controlled<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 What We\u2019ll Do<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use <strong>Terraform<\/strong> to deploy VPC, EC2, RDS, IAM, ALB, etc.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83e\uddf1 Sample Terraform Structure<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>terraform\/\n\u251c\u2500\u2500 main.tf         # Provider and modules\n\u251c\u2500\u2500 vpc.tf          # VPC and subnet config\n\u251c\u2500\u2500 ec2.tf          # Launch template, ASG\n\u251c\u2500\u2500 alb.tf          # Load balancer setup\n\u251c\u2500\u2500 rds.tf          # Database\n\u251c\u2500\u2500 outputs.tf      # Useful outputs (IP, URLs)<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd27 Example Snippet<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>resource \"aws_launch_template\" \"app\" {\n  name_prefix   = \"web-app\"\n  image_id      = \"ami-0abc12345\"\n  instance_type = \"t3.micro\"\n  user_data     = filebase64(\"init.sh\")\n}\n\nresource \"aws_autoscaling_group\" \"app_asg\" {\n  desired_capacity     = 2\n  max_size             = 5\n  min_size             = 1\n  launch_template {\n    id      = aws_launch_template.app.id\n    version = \"$Latest\"\n  }\n  vpc_zone_identifier = &#91;aws_subnet.public1.id, aws_subnet.public2.id]\n  target_group_arns   = &#91;aws_lb_target_group.app_tg.arn]\n}<\/code><\/pre>\n\n\n\n<p>Run it all with:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>terraform init\nterraform apply<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd10 3. Secrets Manager for Environment Variables<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd39 Why It Matters<\/h3>\n\n\n\n<p>Never hardcode secrets in <code>.env<\/code> files or user data scripts.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 What We\u2019ll Do<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Store API keys, DB passwords securely<\/li>\n\n\n\n<li>Inject them into EC2 via IAM + SDK\/CLI<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd27 Create and Retrieve Secret<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>aws secretsmanager create-secret \\\n  --name db_credentials \\\n  --secret-string '{\"username\":\"admin\",\"password\":\"mypassword\"}'\n\naws secretsmanager get-secret-value --secret-id db_credentials<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd27 Access via Code (Python Example)<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>import boto3\nimport json\n\nsecrets = boto3.client('secretsmanager')\nresponse = secrets.get_secret_value(SecretId='db_credentials')\ncreds = json.loads(response&#91;'SecretString'])\nprint(creds&#91;'username'])<\/code><\/pre>\n\n\n\n<p>Or pass to container as ENV via EC2 User Data script:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#!\/bin\/bash\nexport DB_USER=$(aws secretsmanager get-secret-value --secret-id db_credentials --query 'SecretString' --output text | jq -r .username)<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udce6 What You\u2019ve Built<\/h3>\n\n\n\n<p>\u2705 EC2 Auto Scaling behind ALB \u2705 Declarative Infrastructure via Terraform \u2705 Secure Secrets Management via AWS-native services<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the last post, we deployed a secure, scalable AWS architecture for a restaurant booking app using EC2, RDS, and 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