Repository contains terraform module creating global cluster consisting of two clusters with Aurora 5.7 version in two different AWS regions:
- terraform 0.12.7
- plugin "null" (hashicorp/null) 2.1.2
- plugin "aws" (hashicorp/aws) 2.41.0
Module logic is as follows:
- Initializating two aws providers in us-east-1 and us-east-2 regions
- Creating two DB subnet groups in two regions
- Creating primary cluster with 5.7.mysql_aurora.2.07.0 engine version and 1 db instance within this cluster in one region
- Transforming cluster into global cluster
- Adding secondary region by creating additional cluster with read-replica instance
- Defining null resources required to remove clusters from global cluster and then deleting the global cluster itself
Steps to remove all resources:
- Execute
terraform apply -var 'delete=true' - Execute
terraform destroy
Important nuances:
- secondary cluster must not contain database_name, master_username and master_password parameters
- secondary cluster is recommended to be added with lifecycle ignoring all further changes
- global_cluster_identifier needs to be indicated through its name and not via data.aws_rds_cluster resource
- instance_class needs to be of supported type: db.r4.large or higher
- correct depends_on values are required for almost all resources