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infra.tf
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infra.tf
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provider "aws" {
region = "eu-central-1"
default_tags {
tags = {
"managed" = "terraform",
"ou" = "devops",
"purpose" = "ci",
}
}
}
# Persistence layer
data "terraform_remote_state" "base" {
backend = "remote"
config = {
organization = "Tyk"
workspaces = {
name = var.base
}
}
}
resource "aws_security_group" "instances" {
name = "instances"
description = "EFS, ssh and egress"
vpc_id = data.terraform_remote_state.base.outputs.vpc.id
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
}
resource "aws_vpc_security_group_ingress_rule" "ssh" {
security_group_id = aws_security_group.instances.id
cidr_ipv4 = "0.0.0.0/0"
from_port = 22
to_port = 22
ip_protocol = "tcp"
}
resource "aws_vpc_security_group_ingress_rule" "efs_tasks" {
security_group_id = aws_security_group.instances.id
cidr_ipv4 = data.terraform_remote_state.base.outputs.vpc.cidr
from_port = 2049
to_port = 2049
ip_protocol = "tcp"
}
# CD tasks will run in the public subnet
resource "aws_efs_mount_target" "shared" {
for_each = toset(data.terraform_remote_state.base.outputs.vpc.public_subnets)
file_system_id = data.terraform_remote_state.base.outputs.shared_efs
subnet_id = each.value
security_groups = [aws_security_group.instances.id]
}
# TODO: remove deptrack when done
resource "aws_efs_mount_target" "deptrack" {
for_each = toset(data.terraform_remote_state.base.outputs.vpc.public_subnets)
file_system_id = data.terraform_remote_state.base.outputs.deptrack_efs
subnet_id = each.value
security_groups = [aws_security_group.instances.id]
}
data "cloudinit_config" "bastion" {
gzip = true
base64_encode = true
part {
content_type = "text/cloud-config"
content = templatefile("bastion-cloudinit.yaml.tftpl", {
efs_mounts = [
# TODO: remove deptrack
{ dev = data.terraform_remote_state.base.outputs.deptrack_efs, mp = "/deptrack" },
{ dev = data.terraform_remote_state.base.outputs.shared_efs, mp = "/shared" },
]
})
}
}
# For debugging cloud-init
# output "cloudinit" {
# value = data.cloudinit_config.bastion.rendered
# }
# Bastion
module "bastion" {
source = "terraform-aws-modules/ec2-instance/aws"
name = "bastion"
ami = data.aws_ami.al2023.id
instance_type = "t3.nano"
key_name = data.terraform_remote_state.base.outputs.key_name
monitoring = true
vpc_security_group_ids = [aws_security_group.instances.id]
subnet_id = element(data.terraform_remote_state.base.outputs.vpc.public_subnets, 0)
associate_public_ip_address = true
user_data_base64 = data.cloudinit_config.bastion.rendered
user_data_replace_on_change = true
# Allow access via SessionManager
create_iam_instance_profile = true
iam_role_description = "IAM role for EC2 instance"
iam_role_policies = {
AmazonSSMManagedInstanceCore = "arn:aws:iam::aws:policy/AmazonSSMManagedInstanceCore",
CloudWatchAgentServerPolicy = "arn:aws:iam::aws:policy/CloudWatchAgentServerPolicy"
}
# Spot request specific attributes
spot_price = "0.1"
spot_wait_for_fulfillment = true
spot_type = "persistent"
spot_instance_interruption_behavior = "terminate"
metadata_options = {
http_tokens = "required" # IMDSv2
}
}
data "aws_ami" "al2023" {
most_recent = true
owners = ["amazon"]
filter {
name = "name"
values = ["al2023-ami-2023*"]
}
filter {
name = "architecture"
values = ["x86_64"]
}
filter {
name = "root-device-type"
values = ["ebs"]
}
filter {
name = "virtualization-type"
values = ["hvm"]
}
}
# Log group for CD tasks
# Everything logs to cloudwatch with prefixes
resource "aws_cloudwatch_log_group" "cd" {
name = "cd"
retention_in_days = 3
}
# Log group for internal tasks
resource "aws_cloudwatch_log_group" "internal" {
name = "internal"
retention_in_days = 7
}
resource "aws_ecs_cluster" "internal" {
name = "internal"
configuration {
execute_command_configuration {
logging = "OVERRIDE"
log_configuration {
cloud_watch_log_group_name = aws_cloudwatch_log_group.cd.name
}
}
}
}
# DNS
resource "aws_route53_record" "bastion" {
zone_id = data.terraform_remote_state.base.outputs.dns.zone_id
name = "bastion"
type = "A"
ttl = "300"
records = [module.bastion.public_ip]
}
# For CD tasks
resource "aws_service_discovery_private_dns_namespace" "dev_internal" {
name = "dev.internal"
description = "For CD ECS tasks"
vpc = data.terraform_remote_state.base.outputs.vpc.id
}
resource "aws_service_discovery_service" "dev_internal" {
name = "dev-internal"
dns_config {
namespace_id = aws_service_discovery_private_dns_namespace.dev_internal.id
dns_records {
ttl = 10
type = "A"
}
dns_records {
ttl = 10
type = "SRV"
}
routing_policy = "MULTIVALUE"
}
health_check_custom_config {
failure_threshold = 1
}
}
resource "aws_ssm_parameter" "cd_sd" {
name = "/cd/sd"
type = "String"
description = "Service discovery registry arn for CD tasks"
value = aws_service_discovery_service.dev_internal.arn
}