使用進階災難復原 (DR) 功能

resource "google_sql_database_instance" "original-primary" {
  name   = "mysql-original-primary-instance"
  region = "us-east1"
  # Specify a database version that supports Cloud SQL Enterprise Plus edition.
  database_version = "MYSQL_8_0"
  instance_type    = "CLOUD_SQL_INSTANCE"

  settings {
    # Specify a tier that supports Cloud SQL Enterprise Plus edition.
    tier    = "db-perf-optimized-N-2"
    edition = "ENTERPRISE_PLUS"
    backup_configuration {
      # You must enable automated backups and binary logging.
      enabled            = true
      binary_log_enabled = true
    }
  }
  # Set `deletion_protection` to true to ensure that one can't accidentally
  # delete this instance by use of Terraform whereas
  # `deletion_protection_enabled` flag protects this instance at the Google Cloud level.
  deletion_protection = false
}

resource "google_sql_database_instance" "dr-replica" {
  name = "mysql-dr-replica-instance"
  # DR replica must be in a different region than the region of the primary instance.
  region = "us-west2"
  # DR replica must be the same database version as the primary instance.
  database_version = "MYSQL_8_0"
  instance_type    = "READ_REPLICA_INSTANCE"
  # Specify the primary instance as the master instance.
  master_instance_name = google_sql_database_instance.original-primary.name

  settings {
    # DR replica must be in the same tier as your primary instance and support Enterprise Plus edition.
    tier    = "db-perf-optimized-N-2"
    edition = "ENTERPRISE_PLUS"
  }

  # Set `deletion_protection` to true to ensure that one can't accidentally
  # delete this instance by use of Terraform whereas
  # `deletion_protection_enabled` flag protects this instance at the Google Cloud level.
  deletion_protection = false
}

data "google_project" "default" {
}

resource "google_sql_database_instance" "original-primary" {
  name   = "mysql-original-primary-instance"
  region = "us-east1"
  # Specify a database version that supports Cloud SQL Enterprise Plus edition.
  database_version = "MYSQL_8_0"
  instance_type    = "CLOUD_SQL_INSTANCE"

  replication_cluster {
    # Designate the DR replica.
    # The format for setting the DR replica is `project-id:dr-replica-name`.
    failover_dr_replica_name = "${data.google_project.default.project_id}:mysql-dr-replica-instance"
  }

  settings {
    # Specify a tier that supports Cloud SQL Enterprise Plus edition.
    tier    = "db-perf-optimized-N-2"
    edition = "ENTERPRISE_PLUS"
    backup_configuration {
      # You must enable automated backups and binary logging.
      enabled            = true
      binary_log_enabled = true
    }
  }
  # Set `deletion_protection` to true to ensure that one can't accidentally
  # delete this instance by use of Terraform whereas
  # `deletion_protection_enabled` flag protects this instance at the Google Cloud level.
  deletion_protection = false
  # Optional. Add more settings.
}

resource "google_sql_database_instance" "dr-replica" {
  name = "mysql-dr-replica-instance"
  # DR replica must be in a different region than the region of the primary instance.
  region = "us-west2"
  # DR replica must be the same database version as the primary instance.
  database_version = "MYSQL_8_0"
  instance_type    = "READ_REPLICA_INSTANCE"
  # Specify the primary instance as the master instance.
  master_instance_name = google_sql_database_instance.original-primary.name

  settings {
    # DR replica must be in the same tier as your primary instance and support Enterprise Plus edition.
    tier    = "db-perf-optimized-N-2"
    edition = "ENTERPRISE_PLUS"
  }

  # Set `deletion_protection` to true to ensure that one can't accidentally
  # delete this instance by use of Terraform whereas
  # `deletion_protection_enabled` flag protects this instance at the Google Cloud level.
  deletion_protection = false
  # Optional. Add more settings.
}

#
# This sample provides the first part of the switchover operation and turns the DR replica
# into the new primary instance.
data "google_project" "default" {
}

resource "google_sql_database_instance" "original-primary" {
  name             = "mysql-original-primary-instance"
  region           = "us-east1"
  database_version = "MYSQL_8_0"
  instance_type    = "CLOUD_SQL_INSTANCE"

  replication_cluster {
    failover_dr_replica_name = "${data.google_project.default.project_id}:mysql-dr-replica-instance"
  }

  settings {
    tier    = "db-perf-optimized-N-2"
    edition = "ENTERPRISE_PLUS"
    backup_configuration {
      enabled            = true
      binary_log_enabled = true
    }
  }
  # Set `deletion_protection` to true to ensure that one can't accidentally
  # delete this instance by use of Terraform whereas
  # `deletion_protection_enabled` flag protects this instance at the Google Cloud level.
  deletion_protection = false
  # Optional. Add more settings.
}

resource "google_sql_database_instance" "dr-replica" {
  name             = "mysql-dr-replica-instance"
  region           = "us-west2"
  database_version = "MYSQL_8_0"
  # Change the instance type from "READ_REPLICA_INSTANCE" to "CLOUD_SQL_INSTANCE".
  instance_type = "CLOUD_SQL_INSTANCE"
  # Remove or comment out the master_instance_name from the DR replica.
  # master_instance_name = google_sql_database_instance.original-primary.name
  # Add the original primary instance to a list of replicas for the new primary.
  replica_names = [google_sql_database_instance.original-primary.name]

  # Designate the original primary instance as the DR replica of the new primary instance.
  # The format for setting the DR replica is `project-id:dr-replica-name`.
  replication_cluster {
    failover_dr_replica_name = "${data.google_project.default.project_id}:${google_sql_database_instance.original-primary.name}"
  }

  settings {
    tier    = "db-perf-optimized-N-2"
    edition = "ENTERPRISE_PLUS"
    backup_configuration {
      # Add a backup configuration section to enable automated backups and binary logging for the new primary instance.
      enabled            = true
      binary_log_enabled = true
    }
  }
  # Set `deletion_protection` to true to ensure that one can't accidentally
  # delete this instance by use of Terraform whereas
  # `deletion_protection_enabled` flag protects this instance at the Google Cloud level.
  deletion_protection = false
  # Optional. Add more settings.
}

#
# This sample provides the second part of the switchover operation and makes the original primary instance
# a replica of the new primary instance. After you run `terraform apply` for this sample, you'll see
# the following message:
#
# "No changes. Your infrastructure matches the configuration.
#
# Terraform has compared your real infrastructure against your configuration and found no differences,
# so no changes are needed.
#
# Apply complete! Resources: 0 added, 0 changed, 0 destroyed."
data "google_project" "default" {
}

resource "google_sql_database_instance" "original-primary" {
  name             = "mysql-original-primary-instance"
  region           = "us-east1"
  database_version = "MYSQL_8_0"
  # Change instance type for the original primary from "CLOUD_SQL_INSTANCE" to "READ_REPLICA_INSTANCE".
  instance_type = "READ_REPLICA_INSTANCE"
  # Set master_instance_name to the the new primary instance, the old DR replica.
  master_instance_name = "mysql-dr-replica-instance"
  # replica_names = [] # If you previously defined a replica_names field in your template, then delete the DR replica
  # (new primary) from the list of replicas.  Don't delete the entire replica_names field.
  # Instead set the field to an empty string. For example, replica_names = [""].

  replication_cluster {
    # This instance no longer requires a designated DR replica since it's a replica.
    # Remove the DR replica designation by setting the field to an empty string.
    failover_dr_replica_name = ""
  }

  settings {
    tier    = "db-perf-optimized-N-2"
    edition = "ENTERPRISE_PLUS"
    backup_configuration {
      # Disable automated backups because this instance is now a replica.
      enabled            = false
      binary_log_enabled = true
    }
  }
  deletion_protection = false
}

resource "google_sql_database_instance" "dr-replica" {
  name             = "mysql-dr-replica-instance"
  region           = "us-west2"
  database_version = "MYSQL_8_0"
  instance_type    = "CLOUD_SQL_INSTANCE"
  replica_names    = [google_sql_database_instance.original-primary.name]


  replication_cluster {
    failover_dr_replica_name = "${data.google_project.default.project_id}:${google_sql_database_instance.original-primary.name}"
  }

  settings {
    tier    = "db-perf-optimized-N-2"
    edition = "ENTERPRISE_PLUS"
    backup_configuration {
      enabled            = true
      binary_log_enabled = true
    }
  }
  deletion_protection = false
}