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main.tf
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main.tf
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data "aws_ami" "app-machine" {
most_recent = true
filter {
name = "name"
values = [lookup(var.ami, "name")]
}
filter {
name = "virtualization-type"
values = ["hvm"]
}
filter {
name = "architecture"
values = ["x86_64"]
}
owners = [lookup(var.ami, "owner")]
}
data "template_file" "ssh-public-key" {
template = file("~/.ssh/id_rsa.pub")
}
resource "aws_key_pair" "deployer" {
key_name = format(
"%s-%s-deployer-key",
lookup(var.instance_tags, "name"), lookup(var.instance_tags, "environment")
)
public_key = data.template_file.ssh-public-key.rendered
}
resource "aws_security_group" "app-sg" {
name = format(
"%s-%s-%s",
lookup(var.instance_tags, "name"), lookup(var.instance_tags, "environment"), var.security_group_name
)
description = format(
"%s-%s-%s",
lookup(var.instance_tags, "name"), lookup(var.instance_tags, "environment"), var.security_group_name
)
}
resource "aws_security_group_rule" "app-sg-ssh" {
security_group_id = aws_security_group.app-sg.id
type = "ingress"
from_port = 22
to_port = 22
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
depends_on = [aws_security_group.app-sg]
}
resource "aws_security_group_rule" "app-sg-http" {
security_group_id = aws_security_group.app-sg.id
type = "ingress"
from_port = 80
to_port = 80
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
depends_on = [aws_security_group.app-sg]
}
resource "aws_security_group_rule" "app-sg-out" {
security_group_id = aws_security_group.app-sg.id
type = "egress"
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
depends_on = [aws_security_group.app-sg]
}
resource "aws_security_group_rule" "app-sg-ssl" {
security_group_id = aws_security_group.app-sg.id
type = "ingress"
from_port = 443
to_port = 443
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
count = var.allow_tls ? 1 : 0
depends_on = [aws_security_group.app-sg]
}
#AWS Instance
resource "aws_instance" "app" {
ami = data.aws_ami.app-machine.id
instance_type = var.instance_type
associate_public_ip_address = true
availability_zone = var.availability_zone
key_name = aws_key_pair.deployer.key_name
tags = {
Name = lookup(var.instance_tags, "name")
Environment = lookup(var.instance_tags, "environment")
OS = lookup(var.instance_tags, "os")
}
depends_on = [aws_security_group.app-sg]
lifecycle {
ignore_changes = [ami]
}
}
resource "aws_network_interface_sg_attachment" "sg-attachment" {
security_group_id = aws_security_group.app-sg.id
network_interface_id = aws_instance.app.primary_network_interface_id
}
resource "aws_ebs_volume" "app" {
availability_zone = var.availability_zone
size = 10
}
resource "aws_volume_attachment" "ebs_att" {
device_name = "/dev/sdh"
volume_id = aws_ebs_volume.app.id
instance_id = aws_instance.app.id
}
resource "aws_cloudwatch_metric_alarm" "ec2-cpu" {
alarm_name = format(
"%s-%s-cpu-utilization",
lookup(var.instance_tags, "name"), lookup(var.instance_tags, "environment")
)
comparison_operator = "GreaterThanOrEqualToThreshold"
evaluation_periods = "2"
metric_name = "CPUUtilization"
namespace = "AWS/EC2"
period = var.cloudwatch_metric_alarm_period #seconds
statistic = "Average"
threshold = "80"
alarm_description = "This metric monitors ec2 cpu utilization"
insufficient_data_actions = []
dimensions = {
InstanceId = aws_instance.app.id
}
}