17-EC2 Instances

Module creating fixed EC2 instances for 12 different roles

Stage Modulemodules/17-ec2-instances

Roles

Role	Description	Default Count
web	Web frontend	1
webphp	Web PHP	1
push	Push notification	1
mongo	MongoDB	1
mysql	MySQL primary	1
mysql_mirror	MySQL mirror/slave	1
redis	Redis cache	1
node_center	Node center	1
node_game	Node game	1
node_world	Node world	1
node_chat	Node chat	1
node_commu	Node community	1

Configuration

EC2 Configuration

# terraform.tfvars

# Enable/disable this module
create_instances = true    # false = infra only, no EC2

# Scale instances per role
instance_counts = {
  web          = 2    # Scale web to 2
  node_commu   = 3    # Scale node_commu to 3
  node_world   = 2
  # Omit key = default 1
  # Set 0 = skip role
}

# DB AMI override (pre-baked snapshots)
ec2_ami_ids_db = {
  mysql        = "ami-prebaked-mysql"
  mysql_mirror = "ami-prebaked-mysql"
}

# Second EBS for mysql/mysql_mirror
ebs_home2_size_gb = 100    # Set 0 to disable

Danger

user_data_replace_on_change = true: Changes to scripts/*.sh will DESTROY + CREATE EC2. Backup data first!

Target Apply

# Replace specific instance
terraform apply -replace='module.ec2_instances.aws_instance.this["mysql-1"]'

# Replace multiple instances
terraform apply \
  -replace='module.ec2_instances.aws_instance.this["mysql-1"]' \
  -replace='module.ec2_instances.aws_instance.this["mysql_mirror-1"]'

Outputs

Name	Description
instance_ids	Map of role → instance IDs
private_ips	Map of role → private IPs