Merge pull request #830 from NHSDigital/DTOSS-11851-improve-app-resilience

[DTOSS-11851] - Set minimum replicas to 2 for preprod and prod environments

Author: josielsouzanordcloud

infrastructure/environments/preprod/variables.tfvars

@@ -13,3 +13,4 @@ seed_demo_data                        = false
 allowed_paths                         = ["/notifications/message-status/create"]
 enable_alerting                       = true
 enable_notifications_jobs_schedule    = true
+min_replicas                          = 2

infrastructure/environments/prod/variables.tfvars

@@ -14,3 +14,4 @@ enable_alerting                       = true
 use_apex_domain                       = true
 cae_zone_redundancy_enabled           = true
 enable_notifications_jobs_schedule    = true
+min_replicas                          = 2

infrastructure/modules/container-apps/main.tf

@@ -46,9 +46,10 @@ module "webapp" {
     { APPLICATIONINSIGHTS_CONNECTION_STRING = var.app_insights_connection_string },
     var.deploy_database_as_container ? { DATABASE_PASSWORD = resource.random_password.admin_password[0].result } : {}
   )
-  is_web_app = true
-  port       = 8000
-  probe_path = "/healthcheck"
+  is_web_app   = true
+  port         = 8000
+  probe_path   = "/healthcheck"
+  min_replicas = var.min_replicas
 
 }
 

infrastructure/modules/container-apps/variables.tf

@@ -29,6 +29,11 @@ variable "container_app_environment_id" {
   type        = string
 }
 
+variable "min_replicas" {
+  description = "Minimum number of container replicas"
+  type        = number
+}
+
 variable "default_domain" {
   description = "The container app environment default domain"
   type        = string

infrastructure/terraform/main.tf

@@ -81,4 +81,5 @@ module "container-apps" {
   resource_group_name_infra             = local.resource_group_name
   enable_notifications_jobs_schedule    = var.enable_notifications_jobs_schedule
   queue_length_alert_threshold          = var.queue_length_alert_threshold
+  min_replicas                          = var.min_replicas
 }

infrastructure/terraform/variables.tf

@@ -16,6 +16,12 @@ variable "deploy_container_apps" {
   default     = true
 }
 
+variable "min_replicas" {
+  description = "Minimum number of container replicas"
+  type        = number
+  default     = 1
+}
+
 variable "app_short_name" {
   description = "Application short name (6 characters)"
   type        = string