ECSサービスは、ALBのターゲットグループに5つまでアタッチさせることができ、今年の3月よりアタッチの変更にあたりサービスの再作成が不要となった。
あらかじめ定義した数だけアタッチさせるためにはload_balancerブロックを複数定義しなければならないが、Dynamicブロックを活用してどのように実現できるかを紹介する。
main.tf
module "module" { services = { service1 = { container_name = "serviceA" port = 8881 } service2 = { container_name = "serviceB" port = 8882 } ... } services2 = { service6 = { container_name = "serviceF" port = 8886 } service7 = { container_name = "serviceG" port = 8887 } ... } } ALBのターゲットグループに5つまでしかアタッチできないため、servicesには5つのサービスの定義までしかできない。5つ単位でservices2, services3...と定義していく。
alb.tf
resource "aws_alb_target_group" "services" { for_each = merge(var.services, var.services2, ...) name = "${each.key}" port = lookup(each.value, "port") } ecs.tf
resource "aws_ecs_service" "services" { task_definition = aws_ecs_task_definition.service.arn dynamic "load_balancer" { for_each = var.services content { container_name = load_balancer.value["container_name"] container_port = aws_alb_target_group.schools[load_balancer.key].port target_group_arn = aws_alb_target_group.schools[load_balancer.key].arn } } } resource "aws_ecs_service" "services2" { task_definition = aws_ecs_task_definition.service.arn dynamic "load_balancer" { for_each = var.services2 content { container_name = load_balancer.value["container_name"] container_port = aws_alb_target_group.schools[load_balancer.key].port target_group_arn = aws_alb_target_group.schools[load_balancer.key].arn } } } resource "aws_ecs_task_definition" "services" { container_definitions = jsonencode(concat( [ { cpu = 0 disableNetworking = false name = "nginx" } ], [for name, service in var.services : merge( { cpu = 0 disableNetworking = false portMappings = [ { containerPort = aws_alb_target_group.service[name].port hostPort = aws_alb_target_group.service[name].port protocol = "tcp" } ] environment = [ { name = "PORT" value = "${tostring(aws_alb_target_group.services[name].port)}" } ] name = lookup(service, "container_name") }) ]) ) } resource "aws_ecs_task_definition" "services2" { container_definitions = jsonencode(concat( [ { cpu = 0 disableNetworking = false name = "nginx" } ], [for name, service in var.services2 : merge( { cpu = 0 disableNetworking = false portMappings = [ { containerPort = aws_alb_target_group.service[name].port hostPort = aws_alb_target_group.service[name].port protocol = "tcp" } ] environment = [ { name = "PORT" value = "${tostring(aws_alb_target_group.services[name].port)}" } ] name = lookup(service, "container_name") }) ]) ) } 
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