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006_ec2.tf
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006_ec2.tf
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## ------------------------------------------------------------------------------------
## AMI
## ------------------------------------------------------------------------------------
data "aws_ami" "amazon_linux_2023" {
most_recent = true
owners = ["amazon"]
# https://docs.aws.amazon.com/linux/al2023/ug/ec2.html#launch-from-ec2-console
filter {
name = "name"
values = ["al2023-ami-*"]
# values = ["al2023-ami-ecs-hvm-2023.0.20230509-kernel-6.1-x86_64"]
# values = ["al2023-ami-ecs-hvm-2023*"]
}
filter {
name = "root-device-type"
values = ["ebs"]
}
filter {
name = "virtualization-type"
values = ["hvm"]
}
filter {
name = "architecture"
values = ["x86_64"]
}
}
## ------------------------------------------------------------------------------------
## EC2 SSH Key
## ------------------------------------------------------------------------------------
resource "tls_private_key" "ec2_ssh_key" {
algorithm = "RSA"
rsa_bits = 4096
}
resource "aws_key_pair" "generated_key" {
key_name = local.global_prefix
public_key = tls_private_key.ec2_ssh_key.public_key_openssh
}
## ------------------------------------------------------------------------------------
## EC2 Launch Template
## ------------------------------------------------------------------------------------
resource "aws_launch_template" "lt_with_no_ami_lifecycle" {
count = var.ec2_update_ami_if_available == true ? 1 : 0
image_id = data.aws_ami.amazon_linux_2023.id
instance_type = var.ec2_host_instance_type
vpc_security_group_ids = local.ec2_sg_final
key_name = aws_key_pair.generated_key.key_name
iam_instance_profile {
name = data.aws_iam_instance_profile.tower_vm.name
}
metadata_options {
# IMDS token config
http_tokens = var.ec2_require_imds_token == true ? "required" : "optional"
}
user_data = base64encode(local.lt_content_raw)
}
resource "aws_launch_template" "lt_with_ami_lifecycle" {
count = var.ec2_update_ami_if_available == false ? 1 : 0
image_id = data.aws_ami.amazon_linux_2023.id
instance_type = var.ec2_host_instance_type
vpc_security_group_ids = local.ec2_sg_final
key_name = aws_key_pair.generated_key.key_name
iam_instance_profile {
name = data.aws_iam_instance_profile.tower_vm.name
}
metadata_options {
# IMDS token config
http_tokens = var.ec2_require_imds_token == true ? "required" : "optional"
}
user_data = base64encode(local.lt_content_raw)
lifecycle {
ignore_changes = [ image_id ]
}
}
## ------------------------------------------------------------------------------------
## EC2 Instance
## ------------------------------------------------------------------------------------
resource "aws_instance" "ec2" {
depends_on = [module.rds[0]]
subnet_id = local.subnet_ids_ec2[0]
launch_template {
# id = aws_launch_template.lt.id
id = ( var.ec2_update_ami_if_available == true ?
aws_launch_template.lt_with_no_ami_lifecycle[0].id : aws_launch_template.lt_with_ami_lifecycle[0].id
)
version = "$Latest"
}
root_block_device {
encrypted = var.flag_encrypt_ebs
kms_key_id = var.flag_use_kms_key == true ? var.ec2_ebs_kms_key : ""
}
# This is here to stop the EC2 from being updated in place due to perception user data has changed
# when it actually hasn't (triggered by `depends_on` or `data` read). See:
# - https://github.com/hashicorp/terraform-provider-aws/issues/5011
# - https://github.com/hashicorp/terraform/issues/11806
lifecycle {
ignore_changes = [user_data]
}
metadata_options {
# IMDS token config
http_tokens = var.ec2_require_imds_token == true ? "required" : "optional"
}
tags = {
tag-key = local.global_prefix # This tag allows Console InstanceConnect to attach
Name = local.global_prefix
}
}
## ------------------------------------------------------------------------------------
## Elatic IP & Association
## Use so machine termination will not require changes to external DNS.
## ------------------------------------------------------------------------------------
resource "aws_eip" "towerhost" {
count = var.flag_make_instance_public == true ? 1 : 0
domain = "vpc"
}
resource "aws_eip_association" "eip_assoc" {
count = var.flag_make_instance_public == true ? 1 : 0
instance_id = aws_instance.ec2.id
allocation_id = aws_eip.towerhost[0].id
}
## ------------------------------------------------------------------------------------
## Instance Connect Endpoint -- critical for SSH into private subnets
## ------------------------------------------------------------------------------------
# This turned out to be a moot issue since a VPC can only have a single EICE endpoint. Keeping anyways in case folks have more quota.
# https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/eice-quotas.html
# https://discuss.hashicorp.com/t/the-for-each-value-depends-on-resource-attributes-that-cannot-be-determined-until-apply/25016/2
resource "aws_ec2_instance_connect_endpoint" "example" {
count = var.flag_make_instance_private == true || var.flag_make_instance_private_behind_public_alb == true ? 1 : 0
subnet_id = local.subnet_ids_ec2[0]
security_group_ids = [module.tower_eice_egress_sg.security_group_id]
tags = {
Name = local.global_prefix
}
}