Created
December 13, 2025 12:46
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An old and involved way to PrivateLink MSK brokers
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| locals { | |
| broker_fqdns = [for broker in split(",", aws_msk_cluster.kafka.bootstrap_brokers_tls) : | |
| trimsuffix(broker, ":${var.msk_port}")] | |
| broker_addrs = { for broker in data.dns_a_record_set.brokers : broker.addrs[0] => broker.host } | |
| pl_relevant_enis = (var.enable_privatelink ? [for eni in data.aws_network_interface.brokers : | |
| merge({ public_fqdn = local.broker_addrs[eni["private_ip"]] }, eni) | |
| if contains(keys(local.broker_addrs), eni["private_ip"])] : []) | |
| az_map = { for i in range(length(data.aws_availability_zones.available.names)) : | |
| data.aws_availability_zones.available.names[i] => data.aws_availability_zones.available.zone_ids[i] } | |
| pl_json = var.enable_privatelink ? jsonencode({ | |
| dns_zone_name = "kafka.${var.region}.amazonaws.com" | |
| brokers = [ | |
| for svc in aws_vpc_endpoint_service.privatelink : { | |
| zone_id = local.az_map[tolist(svc.availability_zones)[0]] | |
| vpce_svc = svc.service_name | |
| hostname = svc.tags["BrokerFqdn"] | |
| } | |
| ] | |
| }) : null | |
| } | |
| resource "aws_lb" "brokers" { | |
| count = var.broker_count | |
| name = "XXXXX-${trimprefix(split(".", local.pl_relevant_enis[count.index]["public_fqdn"])[0], "b-")}" | |
| internal = true | |
| subnets = [local.pl_relevant_enis[count.index]["subnet_id"]] | |
| load_balancer_type = "network" | |
| enable_deletion_protection = XXXXX | |
| enable_cross_zone_load_balancing = false | |
| tags = { | |
| BrokerFqdn = local.pl_relevant_enis[count.index]["public_fqdn"] | |
| } | |
| } | |
| resource "aws_lb_target_group" "brokers" { | |
| count = var.broker_count | |
| name = "XXXXX-${trimprefix(split(".", local.pl_relevant_enis[count.index]["public_fqdn"])[0], "b-")}" | |
| port = var.msk_port | |
| protocol = XXXXX | |
| target_type = XXXXX | |
| vpc_id = var.vpc_id | |
| lifecycle { | |
| ignore_changes = [tags] | |
| } | |
| } | |
| resource "aws_lb_target_group_attachment" "brokers" { | |
| count = var.broker_count | |
| target_group_arn = aws_lb_target_group.brokers[count.index].arn | |
| target_id = local.pl_relevant_enis[count.index]["private_ip"] | |
| } | |
| resource "aws_lb_listener" "brokers" { | |
| count = var.broker_count | |
| load_balancer_arn = aws_lb.brokers[count.index].arn | |
| port = var.msk_port | |
| protocol = xxxxx | |
| default_action { | |
| type = "forward" | |
| target_group_arn = aws_lb_target_group.brokers[count.index].arn | |
| } | |
| lifecycle { | |
| ignore_changes = [tags] | |
| } | |
| } | |
| resource "aws_vpc_endpoint_service" "privatelink" { | |
| count = length(aws_lb.brokers) | |
| acceptance_required = XXXXX | |
| network_load_balancer_arns = [aws_lb.brokers[count.index].arn] | |
| allowed_principals = [XXXXX] | |
| tags = { | |
| Name = "XXXXX-${trimprefix(split(".", aws_lb.brokers[count.index].tags["BrokerFqdn"])[0], "b-")}" | |
| BrokerFqdn = aws_lb.brokers[count.index].tags["BrokerFqdn"] | |
| } | |
| } | |
| variable "broker_count" {} | |
| variable "msk_port" {} | |
| variable "vpc_id" {} | |
| variable "enable_privatelink" {} | |
| variable "region" {} |
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