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| provider "aws" { | |
| region = "${var.region}" | |
| } | |
| resource "aws_launch_configuration" "webcluster" { | |
| image_id= "${var.ami}" | |
| instance_type = "${var.instance_type}" | |
| security_groups = ["${aws_security_group.websg.id}"] | |
| key_name = "${aws_key_pair.myawskeypair.key_name}" | |
| user_data = "${file("user-data/bootstrap.sh")}" | |
| lifecycle { | |
| create_before_destroy = true | |
| } | |
| } | |
| resource "aws_key_pair" "myawskeypair" { | |
| key_name = "myawskeypair" | |
| public_key = "${file("${var.key_path}")}" | |
| } | |
| resource "aws_autoscaling_group" "scalegroup" { | |
| launch_configuration = "${aws_launch_configuration.webcluster.name}" | |
| availability_zones = ["us-east-1a", "us-east-1b", "us-east-1c"] | |
| min_size = 1 | |
| max_size = 4 | |
| enabled_metrics = ["GroupMinSize", "GroupMaxSize", "GroupDesiredCapacity", "GroupInServiceInstances", "GroupTotalInstances"] | |
| metrics_granularity="1Minute" | |
| load_balancers= ["${aws_elb.elb1.id}"] | |
| health_check_type="ELB" | |
| tag { | |
| key = "Name" | |
| value = "webserver000" | |
| propagate_at_launch = true | |
| } | |
| } | |
| resource "aws_autoscaling_policy" "autopolicy" { | |
| name = "terraform-autoplicy" | |
| scaling_adjustment = 1 | |
| adjustment_type = "ChangeInCapacity" | |
| cooldown = 300 | |
| autoscaling_group_name = "${aws_autoscaling_group.scalegroup.name}" | |
| } | |
| resource "aws_cloudwatch_metric_alarm" "cpualarm" { | |
| alarm_name = "terraform-alarm" | |
| comparison_operator = "GreaterThanOrEqualToThreshold" | |
| evaluation_periods = "2" | |
| metric_name = "CPUUtilization" | |
| namespace = "AWS/EC2" | |
| period = "120" | |
| statistic = "Average" | |
| threshold = "60" | |
| dimensions { | |
| AutoScalingGroupName = "${aws_autoscaling_group.scalegroup.name}" | |
| } | |
| alarm_description = "This metric monitor EC2 instance cpu utilization" | |
| alarm_actions = ["${aws_autoscaling_policy.autopolicy.arn}"] | |
| } | |
| # | |
| resource "aws_autoscaling_policy" "autopolicy-down" { | |
| name = "terraform-autoplicy-down" | |
| scaling_adjustment = -1 | |
| adjustment_type = "ChangeInCapacity" | |
| cooldown = 300 | |
| autoscaling_group_name = "${aws_autoscaling_group.scalegroup.name}" | |
| } | |
| resource "aws_cloudwatch_metric_alarm" "cpualarm-down" { | |
| alarm_name = "terraform-alarm-down" | |
| comparison_operator = "LessThanOrEqualToThreshold" | |
| evaluation_periods = "2" | |
| metric_name = "CPUUtilization" | |
| namespace = "AWS/EC2" | |
| period = "120" | |
| statistic = "Average" | |
| threshold = "10" | |
| dimensions { | |
| AutoScalingGroupName = "${aws_autoscaling_group.scalegroup.name}" | |
| } | |
| alarm_description = "This metric monitor EC2 instance cpu utilization" | |
| alarm_actions = ["${aws_autoscaling_policy.autopolicy-down.arn}"] | |
| } | |
| resource "aws_security_group" "websg" { | |
| name = "security_group_for_web_server" | |
| ingress { | |
| from_port = 80 | |
| to_port = 80 | |
| protocol = "tcp" | |
| cidr_blocks = ["0.0.0.0/0"] | |
| } | |
| egress { | |
| from_port = 0 | |
| to_port = 65535 | |
| protocol = "tcp" | |
| cidr_blocks = ["0.0.0.0/0"] | |
| } | |
| lifecycle { | |
| create_before_destroy = true | |
| } | |
| } | |
| resource "aws_security_group_rule" "ssh" { | |
| security_group_id = "${aws_security_group.websg.id}" | |
| type = "ingress" | |
| from_port = 22 | |
| to_port = 22 | |
| protocol = "tcp" | |
| cidr_blocks = ["0.0.0.0/0"] | |
| } | |
| resource "aws_security_group" "elbsg" { | |
| name = "security_group_for_elb" | |
| ingress { | |
| from_port = 80 | |
| to_port = 80 | |
| protocol = "tcp" | |
| cidr_blocks = ["0.0.0.0/0"] | |
| } | |
| egress { | |
| from_port = 0 | |
| to_port = 0 | |
| protocol = "-1" | |
| cidr_blocks = ["0.0.0.0/0"] | |
| } | |
| lifecycle { | |
| create_before_destroy = true | |
| } | |
| } | |
| resource "aws_elb" "elb1" { | |
| name = "terraform-elb" | |
| availability_zones = ["us-east-1a", "us-east-1b", "us-east-1c"] | |
| security_groups = ["${aws_security_group.elbsg.id}"] | |
| listener { | |
| instance_port = 80 | |
| instance_protocol = "http" | |
| lb_port = 80 | |
| lb_protocol = "http" | |
| } | |
| health_check { | |
| healthy_threshold = 2 | |
| unhealthy_threshold = 2 | |
| timeout = 3 | |
| target = "HTTP:80/" | |
| interval = 30 | |
| } | |
| cross_zone_load_balancing = true | |
| idle_timeout = 400 | |
| connection_draining = true | |
| connection_draining_timeout = 400 | |
| tags { | |
| Name = "terraform-elb" | |
| } | |
| } | |
| resource "aws_lb_cookie_stickiness_policy" "cookie_stickness" { | |
| name = "cookiestickness" | |
| load_balancer = "${aws_elb.elb1.id}" | |
| lb_port = 80 | |
| cookie_expiration_period = 600 | |
| } | |
| output "availabilityzones" { | |
| value = ["us-east-1a", "us-east-1b", "us-east-1c"] | |
| } | |
| output "elb-dns" { | |
| value = "${aws_elb.elb1.dns_name}" | |
| } |
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