Terraform AWS ALB

This terraform module is used to create ALB on AWS.

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We eat, drink, sleep and most importantly love DevOps. We are working towards strategies for standardizing architecture while ensuring security for the infrastructure. We are strong believer of the philosophy Bigger problems are always solved by breaking them into smaller manageable problems. Resonating with microservices architecture, it is considered best-practice to run database, cluster, storage in smaller connected yet manageable pieces within the infrastructure.

This module is basically combination of Terraform open source and includes automatation tests and examples. It also helps to create and improve your infrastructure with minimalistic code instead of maintaining the whole infrastructure code yourself.

We have fifty plus terraform modules. A few of them are comepleted and are available for open source usage while a few others are in progress.

Prerequisites

This module has a few dependencies:

• Terraform 1.5.3

Examples

IMPORTANT: Since the master branch used in source varies based on new modifications, we suggest that you use the release versions here.

Here are examples of how you can use this module in your inventory structure:

ALB Example

  module "alb" {
    source                     = "clouddrove/alb/aws"
    version                    = "1.4.0"
    name                       = local.name
    enable                     = true
    internal                   = true
    load_balancer_type         = "application"
    instance_count             = module.ec2.instance_count
    subnets                    = module.public_subnets.public_subnet_id
    target_id                  = module.ec2.instance_id
    vpc_id                     = module.vpc.vpc_id
    allowed_ip                 = [module.vpc.vpc_cidr_block]
    allowed_ports              = [3306]
    listener_certificate_arn   = module.acm.arn
    enable_deletion_protection = false
    with_target_group          = true
    https_enabled              = true
    http_enabled               = true
    https_port                 = 443
    listener_type              = "forward"
    target_group_port          = 80

    http_tcp_listeners = [
      {
        port               = 80
        protocol           = "TCP"
        target_group_index = 0
      },
      {
        port               = 81
        protocol           = "TCP"
        target_group_index = 0
      },
    ]
    https_listeners = [
      {
        port               = 443
        protocol           = "TLS"
        target_group_index = 0
        certificate_arn    = module.acm.arn
      },
      {
        port               = 84
        protocol           = "TLS"
        target_group_index = 0
        certificate_arn    = module.acm.arn
      },
    ]

    target_groups = [
      {
        backend_protocol     = "HTTP"
        backend_port         = 80
        target_type          = "instance"
        deregistration_delay = 300
        health_check = {
          enabled             = true
          interval            = 30
          path                = "/"
          port                = "traffic-port"
          healthy_threshold   = 3
          unhealthy_threshold = 3
          timeout             = 10
          protocol            = "HTTP"
          matcher             = "200-399"
        }
      }
    ]

    extra_ssl_certs = [
      {
        https_listener_index = 0
        certificate_arn      = module.acm.arn
      }
    ]
    }

NLB Example

  module "nlb" {
    source                     = "clouddrove/alb/aws"
    version                    = "1.4.0"
    name                       = local.name
    enable                     = true
    internal                   = false
    load_balancer_type         = "network"
    instance_count             = module.ec2.instance_count
    subnets                    = module.public_subnets.public_subnet_id
    target_id                  = module.ec2.instance_id
    vpc_id                     = module.vpc.vpc_id
    enable_deletion_protection = false
    with_target_group          = true
    http_tcp_listeners = [
      {
        port               = 80
        protocol           = "TCP"
        target_group_index = 0
      },
      {
        port               = 81
        protocol           = "TCP"
        target_group_index = 0
      },
    ]
    target_groups = [
      {
        backend_protocol = "TCP"
        backend_port     = 80
        target_type      = "instance"
      },
      {
        backend_protocol = "TCP"
        backend_port     = 81
        target_type      = "instance"
      },
    ]

    https_listeners = [
      {
        port               = 443
        protocol           = "TLS"
        target_group_index = 0
        certificate_arn    = module.acm.arn
      },
      {
        port               = 84
        protocol           = "TLS"
        target_group_index = 0
        certificate_arn    = module.acm.arn
      },
    ]
  }

CLB Example

  module "clb" {
  source                     = "clouddrove/alb/aws"
  version                    = "1.4.0"

  name               = local.name
  load_balancer_type = "classic"
  clb_enable         = true
  internal           = true
  vpc_id             = module.vpc.vpc_id
  target_id          = module.ec2.instance_id
  subnets            = module.public_subnets.public_subnet_id
  with_target_group  = true
  listeners = [
    {
      lb_port            = 22000
      lb_protocol        = "TCP"
      instance_port      = 22000
      instance_protocol  = "TCP"
      ssl_certificate_id = null
    },
    {
      lb_port            = 4444
      lb_protocol        = "TCP"
      instance_port      = 4444
      instance_protocol  = "TCP"
      ssl_certificate_id = null
    }
  ]
  health_check_target              = "TCP:4444"
  health_check_timeout             = 10
  health_check_interval            = 30
  health_check_unhealthy_threshold = 5
  health_check_healthy_threshold   = 5
  }

Inputs

Name	Description	Type	Default	Required
access_logs	Map containing access logging configuration for load balancer.	map(string)	{}	no
allowed_ip	List of allowed ip.	list(any)	[]	no
allowed_ports	List of allowed ingress ports	list(any)	[]	no
cidr_blocks	equal to 0. The supported values are defined in the IpProtocol argument on the IpPermission API reference	list(string)	[ "0.0.0.0/0" ]	no
clb_enable	If true, create clb.	bool	false	no
connection_draining	TBoolean to enable connection draining. Default: false.	bool	false	no
connection_draining_timeout	The time after which connection draining is aborted in seconds.	number	300	no
desync_mitigation_mode	Determines how the load balancer handles requests that might pose a security risk to an application due to HTTP desync.	string	"defensive"	no
egress_protocol	equal to 0. The supported values are defined in the IpProtocol argument on the IpPermission API reference	number	-1	no
egress_rule	Enable to create egress rule	bool	true	no
enable	If true, create alb.	bool	false	no
enable_cross_zone_load_balancing	Indicates whether cross zone load balancing should be enabled in application load balancers.	bool	true	no
enable_deletion_protection	If true, deletion of the load balancer will be disabled via the AWS API. This will prevent Terraform from deleting the load balancer. Defaults to false.	bool	false	no
enable_http2	Indicates whether HTTP/2 is enabled in application load balancers.	bool	true	no
enable_security_group	Enable default Security Group with only Egress traffic allowed.	bool	true	no
enable_tls_version_and_cipher_suite_headers	Indicates whether the two headers (x-amzn-tls-version and x-amzn-tls-cipher-suite), which contain information about the negotiated TLS version and cipher suite, are added to the client request before sending it to the target.	bool	false	no
enable_waf_fail_open	Indicates whether to route requests to targets if lb fails to forward the request to AWS WAF	bool	false	no
enable_xff_client_port	Indicates whether the X-Forwarded-For header should preserve the source port that the client used to connect to the load balancer in application load balancers.	bool	true	no
environment	Environment (e.g. prod, dev, staging).	string	"test"	no
extra_ssl_certs	A list of maps describing any extra SSL certificates to apply to the HTTPS listeners. Required key/values: certificate_arn, https_listener_index (the index of the listener within https_listeners which the cert applies toward).	list(map(string))	[]	no
from_port	(Required) Start port (or ICMP type number if protocol is icmp or icmpv6).	number	0	no
health_check_healthy_threshold	The number of successful health checks before an instance is put into service.	number	10	no
health_check_interval	The time between health check attempts in seconds.	number	30	no
health_check_target	The target to use for health checks.	string	"TCP:80"	no
health_check_timeout	The time after which a health check is considered failed in seconds.	number	5	no
health_check_unhealthy_threshold	The number of failed health checks before an instance is taken out of service.	number	2	no
http_enabled	A boolean flag to enable/disable HTTP listener.	bool	true	no
http_listener_type	The type of routing action. Valid values are forward, redirect, fixed-response, authenticate-cognito and authenticate-oidc.	string	"redirect"	no
http_port	The port on which the load balancer is listening. like 80 or 443.	number	80	no
http_tcp_listener_rules	A list of maps describing the Listener Rules for this ALB. Required key/values: actions, conditions. Optional key/values: priority, http_tcp_listener_index (default to http_tcp_listeners[count.index])	any	[]	no
http_tcp_listeners	A list of maps describing the HTTP listeners or TCP ports for this ALB. Required key/values: port, protocol. Optional key/values: target_group_index (defaults to http_tcp_listeners[count.index])	any	[]	no
https_enabled	A boolean flag to enable/disable HTTPS listener.	bool	true	no
https_listener_rules	A list of maps describing the Listener Rules for this ALB. Required key/values: actions, conditions. Optional key/values: priority, https_listener_index (default to https_listeners[count.index])	any	[]	no
https_listeners	A list of maps describing the HTTPS listeners for this ALB. Required key/values: port, certificate_arn. Optional key/values: ssl_policy (defaults to ELBSecurityPolicy-2016-08), target_group_index (defaults to 0)	list(map(string))	[]	no
https_port	The port on which the load balancer is listening. like 80 or 443.	number	443	no
idle_timeout	The time in seconds that the connection is allowed to be idle.	number	60	no
instance_count	The count of instances.	number	0	no
internal	If true, the LB will be internal.	string	""	no
ip_address_type	The type of IP addresses used by the subnets for your load balancer. The possible values are ipv4 and dualstack.	string	"ipv4"	no
ipv6_cidr_blocks	Enable to create egress rule	list(string)	[ "::/0" ]	no
is_external	enable to udated existing security Group	bool	false	no
label_order	Label order, e.g. name,application.	list(any)	[ "name", "environment" ]	no
listener_certificate_arn	The ARN of the SSL server certificate. Exactly one certificate is required if the protocol is HTTPS.	string	""	no
listener_https_fixed_response	Have the HTTPS listener return a fixed response for the default action.	object({ content_type = string message_body = string status_code = string })	null	no
listener_protocol	The protocol for connections from clients to the load balancer. Valid values are TCP, HTTP and HTTPS. Defaults to HTTP.	string	"HTTPS"	no
listener_type	The type of routing action. Valid values are forward, redirect, fixed-response, authenticate-cognito and authenticate-oidc.	string	"forward"	no
listeners	A list of listener configurations for the ELB.	list(object({ lb_port : number lb_protocol : string instance_port : number instance_protocol : string ssl_certificate_id : string }))	[]	no
load_balancer_create_timeout	Timeout value when creating the ALB.	string	"10m"	no
load_balancer_delete_timeout	Timeout value when deleting the ALB.	string	"10m"	no
load_balancer_type	The type of load balancer to create. Possible values are application or network. The default value is application.	string	""	no
load_balancer_update_timeout	Timeout value when updating the ALB.	string	"10m"	no
managedby	ManagedBy, eg 'CloudDrove'.	string	"[email protected]"	no
name	Name (e.g. app or cluster).	string	""	no
preserve_host_header	Indicates whether Host header should be preserve and forward to targets without any change. Defaults to false.	bool	false	no
protocol	The protocol. If not icmp, tcp, udp, or all use the.	string	"tcp"	no
repository	Terraform current module repo	string	"https://github.com/clouddrove/terraform-aws-alb"	no
sg_description	The security group description.	string	"Instance default security group (only egress access is allowed)."	no
sg_egress_description	Description of the egress and ingress rule	string	"Description of the rule."	no
sg_egress_ipv6_description	Description of the egress_ipv6 rule	string	"Description of the rule."	no
sg_ids	of the security group id.	list(any)	[]	no
sg_ingress_description	Description of the ingress rule	string	"Description of the ingress rule use elasticache."	no
ssl_policy	Name of the SSL Policy for the listener. Required if protocol is HTTPS or TLS.	string	"ELBSecurityPolicy-TLS-1-2-2017-01"	no
status_code	The HTTP redirect code. The redirect is either permanent (HTTP_301) or temporary (HTTP_302).	string	"HTTP_301"	no
subnet_mapping	A list of subnet mapping blocks describing subnets to attach to network load balancer	list(map(string))	[]	no
subnets	A list of subnet IDs to attach to the LB. Subnets cannot be updated for Load Balancers of type network. Changing this value will for load balancers of type network will force a recreation of the resource.	list(any)	[]	no
target_group_port	The port on which targets receive traffic, unless overridden when registering a specific target.	string	80	no
target_groups	A list of maps containing key/value pairs that define the target groups to be created. Order of these maps is important and the index of these are to be referenced in listener definitions. Required key/values: name, backend_protocol, backend_port. Optional key/values are in the target_groups_defaults variable.	any	[]	no
target_id	The ID of the target. This is the Instance ID for an instance, or the container ID for an ECS container. If the target type is ip, specify an IP address.	list(any)	n/a	yes
to_port	equal to 0. The supported values are defined in the IpProtocol argument on the IpPermission API reference	number	65535	no
vpc_id	The identifier of the VPC in which to create the target group.	string	""	no
with_target_group	Create LoadBlancer without target group	bool	true	no
xff_header_processing_mode	Determines how the load balancer modifies the X-Forwarded-For header in the HTTP request before sending the request to the target.	string	"append"	no

Outputs

Name	Description
arn	The ARN of the ALB.
arn_suffix	The ARN suffix of the ALB.
clb_arn	The ARN of the CLB.
clb_name	DNS name of CLB.
clb_zone_id	The ID of the zone which ALB is provisioned.
dns_name	DNS name of ALB.
http_listener_arn	The ARN of the HTTP listener.
https_listener_arn	The ARN of the HTTPS listener.
listener_arns	A list of all the listener ARNs.
main_target_group_arn	The main target group ARN.
name	The ARN suffix of the ALB.
security_group_arn	Amazon Resource Name (ARN) of the security group
security_group_id	ID of the security group
tags	A mapping of tags to assign to the resource.
zone_id	The ID of the zone which ALB is provisioned.

Testing

In this module testing is performed with terratest and it creates a small piece of infrastructure, matches the output like ARN, ID and Tags name etc and destroy infrastructure in your AWS account. This testing is written in GO, so you need a GO environment in your system.

You need to run the following command in the testing folder:

  go test -run Test

Feedback

If you come accross a bug or have any feedback, please log it in our issue tracker, or feel free to drop us an email at [email protected].

If you have found it worth your time, go ahead and give us a ★ on our GitHub!

About us

At CloudDrove, we offer expert guidance, implementation support and services to help organisations accelerate their journey to the cloud. Our services include docker and container orchestration, cloud migration and adoption, infrastructure automation, application modernisation and remediation, and performance engineering.

We are The Cloud Experts!

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