AWS Terraform tried to destory and rebuild RDS cluster

问题

I have an RDS cluster I built using terraform, this is running deletion protection currently.

When I update my terraform script for something (example security group change) and run this into the environment it always tries to breakdown and rebuild the RDS cluster.

Running this now with deletion protection stops the rebuild, but causes the terraform apply to fail as it cannot destroy the cluster.

How can I get this to keep the existing RDS cluster without rebuilding every time I run my script?

`resource "aws_rds_cluster" "env-cluster" {
  cluster_identifier      = "mysql-env-cluster"
  engine                  = "aurora-mysql"
  engine_version          = "5.7.mysql_aurora.2.03.2"
  availability_zones      = ["${var.aws_az1}", "${var.aws_az2}"]
  db_subnet_group_name   = "${aws_db_subnet_group.env-rds-subg.name}"
  database_name           = "dbname"
  master_username         = "${var.db-user}"
  master_password         = "${var.db-pass}"
  backup_retention_period = 5
  preferred_backup_window = "22:00-23:00"
  deletion_protection     = true
  skip_final_snapshot     = true
 }

resource "aws_rds_cluster_instance" "env-01" {
  identifier              = "${var.env-db-01}"
  cluster_identifier      = "${aws_rds_cluster.env-cluster.id}"
  engine                  = "aurora-mysql"
  engine_version          = "5.7.mysql_aurora.2.03.2"
  instance_class          = "db.t2.small"
  apply_immediately       = true
}

resource "aws_rds_cluster_instance" "env-02" {
  identifier              = "${var.env-db-02}"
  cluster_identifier      = "${aws_rds_cluster.env-cluster.id}"
  engine                  = "aurora-mysql"
  engine_version          = "5.7.mysql_aurora.2.03.2"
  instance_class          = "db.t2.small"
  apply_immediately       = true
}

resource "aws_rds_cluster_endpoint" "env-02-ep" {
  cluster_identifier          = "${aws_rds_cluster.env-cluster.id}"
  cluster_endpoint_identifier = "reader"
  custom_endpoint_type        = "READER"

  excluded_members = ["${aws_rds_cluster_instance.env-01.id}"]
}`

来源：https://stackoverflow.com/questions/57372050/aws-terraform-tried-to-destory-and-rebuild-rds-cluster