Adding an Amazon Web Services Region to an Amazon Aurora global database - Amazon Aurora
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Adding an Amazon Web Services Region to an Amazon Aurora global database

You can use the following procedure to add an additional secondary cluster to an existing global database. You can also create a global database from a standalone Aurora DB cluster by using this procedure to add the first secondary Amazon Region.

An Aurora global database needs at least one secondary Aurora DB cluster in a different Amazon Web Services Region than the primary Aurora DB cluster. You can attach up to five secondary DB clusters to your Aurora global database. Repeat the following procedure for each new secondary DB cluster. For each secondary DB cluster that you add to your Aurora global database, reduce the number of Aurora Replicas allowed to the primary DB cluster by one.

For example, if your Aurora global database has 5 secondary Regions, your primary DB cluster can have only 10 (rather than 15) Aurora Replicas. For more information, see Configuration requirements of an Amazon Aurora global database.

The number of Aurora Replicas (reader instances) in the primary DB cluster determines the number of secondary DB clusters you can add. The total number of reader instances in the primary DB cluster plus the number of secondary clusters can't exceed 15. For example, if you have 14 reader instances in the primary DB cluster and 1 secondary cluster, you can't add another secondary cluster to the global database.

Note

For Aurora MySQL version 3, when you create a secondary cluster, make sure that the value of lower_case_table_names matches the value in the primary cluster. This setting is a database parameter that affects how the server handles identifier case sensitivity. For more information about database parameters, see Parameter groups for Amazon Aurora.

We recommend that when you create a secondary cluster, you use the same DB engine version for the primary and secondary. If necessary, upgrade the primary to be the same version as the secondary. For more information, see Patch level compatibility for managed cross-Region switchovers and failovers.

To add an Amazon Web Services Region to an Aurora global database

  1. Sign in to the Amazon Web Services Management Console and open the Amazon RDS console at https://console.amazonaws.cn/rds/.

  2. In the navigation pane of the Amazon Web Services Management Console, choose Databases.

  3. Choose the Aurora global database that needs a secondary Aurora DB cluster. Ensure that the primary Aurora DB cluster is Available.

  4. For Actions, choose Add region.

    Screenshot showing provisioned DB cluster with "Add region" chosen from the Actions menu.

  5. On the Add a region page, choose the secondary Amazon Web Services Region.

    You can't choose an Amazon Web Services Region that already has a secondary Aurora DB cluster for the same Aurora global database. Also, it can't be the same Region as the primary Aurora DB cluster.

    Note

    Babelfish for Aurora PostgreSQL global databases works in secondary regions only if the parameters that control Babelfish preferences are turned on in those regions. For more information, see DB cluster parameter group settings for Babelfish

    The Add a region page for an Aurora global database.

  6. Complete the remaining fields for the secondary Aurora cluster in the new Amazon Region. These are the same configuration options as for any Aurora DB cluster instance, except for the following option for Aurora MySQL–based Aurora global databases only:

  7. Choose Add region.

After you finish adding the Region to your Aurora global database, you can see it in the list of Databases in the Amazon Web Services Management Console as shown in the screenshot.

Screenshot showing the secondary cluster is now part of the Aurora global database.
To add a secondary Amazon Web Services Region to an Aurora global database

To add a secondary cluster to your global database using the CLI, you must already have the global cluster container object. If you haven't already run the create-global-cluster command, see the CLI procedure in Creating an Amazon Aurora global database.

  1. Use the create-db-cluster CLI command with the name (--global-cluster-identifier) of your Aurora global database. For other parameters, do the following:

  2. For --region, choose a different Amazon Web Services Region than that of your Aurora primary Region.

  3. Choose specific values for the --engine and --engine-version parameters. These values are the same as those for the primary Aurora DB cluster in your Aurora global database.

  4. For an encrypted cluster, specify your primary Amazon Web Services Region as the --source-region for encryption.

The following example creates a new Aurora DB cluster and attaches it to an Aurora global database as a read-only secondary Aurora DB cluster. In the last step, an Aurora DB instance is added to the new Aurora DB cluster.

For Linux, macOS, or Unix:

aws rds --region secondary_region \
  create-db-cluster \
    --db-cluster-identifier secondary_cluster_id \
    --global-cluster-identifier global_database_id \
    --engine aurora-mysql | aurora-postgresql \
    --engine-version version

aws rds --region secondary_region \
  create-db-instance \
    --db-instance-class instance_class \
    --db-cluster-identifier secondary_cluster_id \
    --db-instance-identifier db_instance_id \
    --engine aurora-mysql | aurora-postgresql

For Windows:

aws rds --region secondary_region ^
  create-db-cluster ^
    --db-cluster-identifier secondary_cluster_id ^
    --global-cluster-identifier global_database_id_id ^
    --engine aurora-mysql | aurora-postgresql ^
    --engine-version version

aws rds --region secondary_region ^
  create-db-instance ^
    --db-instance-class instance_class ^
    --db-cluster-identifier secondary_cluster_id ^
    --db-instance-identifier db_instance_id ^
    --engine aurora-mysql | aurora-postgresql

To add a new Amazon Web Services Region to an Aurora global database with the RDS API, run the CreateDBCluster operation. Specify the identifier of the existing global database using the GlobalClusterIdentifier parameter.