Merge pull request #9 from ehenrik/main

chore: add support for read replicas
opzkit · Jun 15, 2022 · 81e0d5e · 81e0d5e
2 parents df9f0ab + e07b132
commit 81e0d5e
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Showing 3 changed files with 27 additions and 5 deletions.
diff --git a/main.tf b/main.tf
@@ -57,6 +57,20 @@ resource "aws_rds_cluster_instance" "writer" {
   monitoring_role_arn = var.enhanced_monitoring ? aws_iam_role.rds_enhanced_monitoring[0].arn : null
 }
 
+
+resource "aws_rds_cluster_instance" "reader" {
+  count               = var.reader_instance_type ? 0 : 1
+  cluster_identifier  = aws_rds_cluster.default.cluster_identifier
+  identifier          = "${var.identifier}-reader"
+  instance_class      = var.reader_instance_type
+  engine              = aws_rds_cluster.default.engine
+  engine_version      = aws_rds_cluster.default.engine_version
+  monitoring_interval = var.enhanced_monitoring ? 60 : 0
+  monitoring_role_arn = var.enhanced_monitoring ? aws_iam_role.rds_enhanced_monitoring[0].arn : null
+  promotion_tier      = 1
+
+}
+
 resource "aws_rds_cluster_parameter_group" "cluster_parameters" {
   family = "aurora-mysql5.7"
   name   = "${var.identifier}-cluster-parameters"

diff --git a/secret.tf b/secret.tf
@@ -9,12 +9,14 @@ resource "aws_secretsmanager_secret_version" "aurora_secret_value" {
 
 locals {
   secret_value = {
-    DB_USERNAME = var.master_username
-    DB_PASSWORD = local.password
-    DB_NAME     = aws_rds_cluster.default.cluster_identifier
-    DB_PORT     = aws_rds_cluster.default.port
-    DB_HOST     = aws_rds_cluster.default.endpoint
+    DB_USERNAME    = var.master_username
+    DB_PASSWORD    = local.password
+    DB_NAME        = aws_rds_cluster.default.cluster_identifier
+    DB_PORT        = aws_rds_cluster.default.port
+    DB_HOST        = aws_rds_cluster.default.endpoint
+    DB_READER_HOST = local.reader_instance_endpoint
   }
+  reader_instance_endpoint = var.reader_instance_type ? "" : aws_rds_cluster_instance.reader[0].endpoint
   password = random_password.password.result
 }
 

diff --git a/vars.tf b/vars.tf
@@ -63,3 +63,9 @@ variable "enhanced_monitoring" {
   default     = false
   description = "Enable enhanced monitor on the instance"
 }
+
+variable "reader_instance_type" {
+  type        = string
+  description = "Instance type of writers"
+  default     = null
+}