08. Variables and Parameters

tofu/envs/
├── common_vars.hcl          # Shared across all environments
├── config.hcl               # Backend + provider config
└── <env>/
    └── env_vars.hcl         # Environment-specific settings

# In terragrunt.hcl
locals {
  common_vars = read_terragrunt_config(find_in_parent_folders("common_vars.hcl"))
  env_vars    = read_terragrunt_config("${get_terragrunt_dir()}/../env_vars.hcl")
}

inputs = {
  common_vars = local.common_vars
  env_vars    = local.env_vars
}

# Download both files
sh shell/get_vars.sh <env>

# Downloads from:
# s3://milu2-iac-env/tofu/common_vars.hcl
# s3://milu2-iac-env/tofu/<env>/env_vars.hcl

# Example node_servers
node_servers = {
  world = {
    port_start  = 7551
    port_end    = 7999
    protocol    = "UDP"
    desired     = 1
    secondaries = 0
  }
  commu = {
    port_start  = 9551
    port_end    = 9999
    protocol    = "UDP"
    desired     = 1
    secondaries = 0
  }
  battle = {
    port_start  = 8551
    port_end    = 8999
    protocol    = "UDP"
    desired     = 1
    secondaries = 0
  }
  chat = {
    port_start  = 8101
    port_end    = 8499
    protocol    = "TCP"
    desired     = 1
    secondaries = 0
  }
  center = {
    port_start  = 3000
    port_end    = 3000
    protocol    = "TCP"
    desired     = 1
    secondaries = 0
  }
}

# Example ga_servers
ga_servers = {
  world = {
    from_port = 10000
    to_port   = 19999
  }
  commu = {
    from_port = 20000
    to_port   = 29999
  }
  battle = {
    from_port = 30000
    to_port   = 39999
  }
  chat = {
    from_port = 40000
    to_port   = 48999
  }
}

# Higher capacity
rds_min_capacity  = 2
rds_max_capacity  = 16
api_autoscale_max = 20
web_autoscale_max = 20

# Multi-AZ
elasticache_multi_az_enabled         = true
elasticache_replicas_per_node_group  = 1

# Deletion protection
db_deletion_protection    = true
docdb_deletion_protection = true

# Larger instances
elasticache_node_type = "cache.r6g.large"
memorydb_node_type    = "db.r6g.large"

# Minimal capacity
rds_min_capacity  = 0.5
rds_max_capacity  = 2
api_autoscale_min = 1
web_autoscale_min = 1

# Single AZ
elasticache_multi_az_enabled = false

# Fargate Spot for cost savings
fargate_spot_base   = 1
fargate_spot_weight = 1

default_tags {
  tags = {
    Name        = "${app_name}-${env}"
    Project     = "${app_name}"
    Environment = "${env}"
    Module      = "${path_relative_to_include()}"
  }
}