131 lines
No EOL
5.1 KiB
HCL
131 lines
No EOL
5.1 KiB
HCL
resource "aws_launch_configuration" "launchconfiguration" {
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name_prefix = "maps-${var.environment}-${var.version}-"
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image_id = "${data.aws_ami.amazon_linux.id}"
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key_name = "${data.terraform_remote_state.mono_keypair.key_name}"
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iam_instance_profile = "${aws_iam_instance_profile.profile.name}"
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security_groups = ["${aws_security_group.this.id}",
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"${data.terraform_remote_state.mono_efs.ec2_security_group_id}"]
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instance_type = "${var.instance_type}"
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user_data = "${data.template_cloudinit_config.cloudinit.rendered}"
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ebs_optimized = false
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root_block_device {
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delete_on_termination = true
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volume_size = 50
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}
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lifecycle {
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create_before_destroy = true
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}
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}
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resource "aws_autoscaling_group" "autoscalinggroup" {
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vpc_zone_identifier = ["${data.terraform_remote_state.mono_vpc.sn_private_a_id}"]
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name = "${aws_launch_configuration.launchconfiguration.name}"
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launch_configuration = "${aws_launch_configuration.launchconfiguration.name}"
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max_size = 5
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desired_capacity = 1
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min_size = 1
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default_cooldown = 60
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health_check_grace_period = 300
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health_check_type = "ELB"
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force_delete = true
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termination_policies = ["OldestInstance", "OldestLaunchConfiguration"]
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target_group_arns = ["${aws_alb_target_group.target_group_this.arn}"]
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enabled_metrics = ["GroupMinSize", "GroupMaxSize",
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"GroupDesiredCapacity", "GroupInServiceInstances",
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"GroupPendingInstances", "GroupStandbyInstances",
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"GroupTerminatingInstances", "GroupTotalInstances"]
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lifecycle {
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create_before_destroy = true
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}
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tag {
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key = "Name"
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value = "maps"
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propagate_at_launch = true
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}
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provisioner "local-exec" {
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# Unwrap to read
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# For every instance of the autoscaling group wait to get 3 "healthy" checks efore taking down the old autoscaling group
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command = "echo \"Waiting for instances spinup (2m)\"; sleep 120; current=0; required=3; instances=$(aws autoscaling describe-auto-scaling-groups --auto-scaling-group-name \"${aws_autoscaling_group.autoscalinggroup.name}\" --query 'AutoScalingGroups[*].Instances[*].InstanceId' --output text); for i in $(echo $instances); do check=$(aws elbv2 describe-target-health --target-group-arn \"${aws_alb_target_group.target_group_this.arn}\" --query \"TargetHealthDescriptions[?Target.Id == '$i'].TargetHealth.State\" --output text); while true; if [ \"$current\" == \"$required\" ]; then break;fi; if [ \"$check\" == \"healthy\" ]; then current=$((++current)); fi; do echo \"check = $check\"; echo \"Waiting for instance $i startup\"; sleep 15; check=$(aws elbv2 describe-target-health --target-group-arn \"${aws_alb_target_group.target_group_this.arn}\" --query \"TargetHealthDescriptions[?Target.Id == '$i'].TargetHealth.State\" --output text); done; current=0; done; echo \"Got 3 healthy checks in a row, proceeding...\"; sleep 10"
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}
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}
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#
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# Autoscaling policies
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#
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resource "aws_autoscaling_policy" "this-autoscale_group_policy_up_x1" {
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name = "maps-autoscale_group_policy_up_x1"
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scaling_adjustment = 1
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adjustment_type = "ChangeInCapacity"
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cooldown = 60
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autoscaling_group_name = "${aws_autoscaling_group.autoscalinggroup.name}"
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}
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resource "aws_autoscaling_policy" "this-autoscale_group_policy_down_x1" {
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name = "maps-autoscale_group_policy_down_x1"
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scaling_adjustment = -1
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adjustment_type = "ChangeInCapacity"
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cooldown = 60
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autoscaling_group_name = "${aws_autoscaling_group.autoscalinggroup.name}"
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}
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#
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# ASG alarms
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#
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resource "aws_cloudwatch_metric_alarm" "this-cpu_high_alarm" {
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alarm_name = "alarm-cpu-high-maps"
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alarm_description = "This alarm triggers when CPU load in Autoscaling group is high."
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metric_name = "CPUUtilization"
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namespace = "AWS/EC2"
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dimensions {
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AutoScalingGroupName = "${aws_autoscaling_group.autoscalinggroup.name}"
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}
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statistic = "Average"
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comparison_operator = "GreaterThanOrEqualToThreshold"
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evaluation_periods = "1"
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period = "60"
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threshold = "70"
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# Use autoscaling policy ARN as an alarm action here
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# Reference: http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html
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alarm_actions = [
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"${aws_autoscaling_policy.this-autoscale_group_policy_up_x1.arn}",
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]
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dimensions {
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AutoScalingGroupName = "${aws_autoscaling_group.autoscalinggroup.name}"
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}
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}
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resource "aws_cloudwatch_metric_alarm" "this-cpu_low_alarm" {
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alarm_name = "alarm-cpu-low-maps"
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alarm_description = "This alarm triggers when CPU load in Autoscaling group is low."
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metric_name = "CPUUtilization"
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namespace = "AWS/EC2"
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dimensions {
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AutoScalingGroupName = "${aws_autoscaling_group.autoscalinggroup.name}"
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}
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statistic = "Average"
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comparison_operator = "LessThanOrEqualToThreshold"
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evaluation_periods = "1"
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period = "60"
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threshold = "35"
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# Use autoscaling policy ARN as an alarm action here
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# Reference: http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html
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alarm_actions = [
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"${aws_autoscaling_policy.this-autoscale_group_policy_down_x1.arn}",
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]
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dimensions {
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AutoScalingGroupName = "${aws_autoscaling_group.autoscalinggroup.name}"
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}
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} |