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**Example 1: To modify a DB cluster** The following ``modify-db-cluster`` example changes the master user password for the DB cluster named ``cluster-2`` and sets the backup retention period to 14 days. The ``--apply-immediately`` parameter causes the changes to be made immediately, instead of waiting until the next maintenance window. :: aws rds modify-db-cluster \ --db-cluster-identifier cluster-2 \ --backup-retention-period 14 \ --master-user-password newpassword99 \ --apply-immediately Output:: { "DBCluster": { "AllocatedStorage": 1, "AvailabilityZones": [ "eu-central-1b", "eu-central-1c", "eu-central-1a" ], "BackupRetentionPeriod": 14, "DatabaseName": "", "DBClusterIdentifier": "cluster-2", "DBClusterParameterGroup": "default.aurora5.6", "DBSubnetGroup": "default-vpc-2305ca49", "Status": "available", "EarliestRestorableTime": "2020-06-03T02:07:29.637Z", "Endpoint": "cluster-2.cluster-############.eu-central-1.rds.amazonaws.com", "ReaderEndpoint": "cluster-2.cluster-ro-############.eu-central-1.rds.amazonaws.com", "MultiAZ": false, "Engine": "aurora", "EngineVersion": "5.6.10a", "LatestRestorableTime": "2020-06-04T15:11:25.748Z", "Port": 3306, "MasterUsername": "admin", "PreferredBackupWindow": "01:55-02:25", "PreferredMaintenanceWindow": "thu:21:14-thu:21:44", "ReadReplicaIdentifiers": [], "DBClusterMembers": [ { "DBInstanceIdentifier": "cluster-2-instance-1", "IsClusterWriter": true, "DBClusterParameterGroupStatus": "in-sync", "PromotionTier": 1 } ], "VpcSecurityGroups": [ { "VpcSecurityGroupId": "sg-20a5c047", "Status": "active" } ], "HostedZoneId": "Z1RLNU0EXAMPLE", "StorageEncrypted": true, "KmsKeyId": "arn:aws:kms:eu-central-1:123456789012:key/d1bd7c8f-5cdb-49ca-8a62-a1b2c3d4e5f6", "DbClusterResourceId": "cluster-AGJ7XI77XVIS6FUXHU1EXAMPLE", "DBClusterArn": "arn:aws:rds:eu-central-1:123456789012:cluster:cluster-2", "AssociatedRoles": [], "IAMDatabaseAuthenticationEnabled": false, "ClusterCreateTime": "2020-04-03T14:44:02.764Z", "EngineMode": "provisioned", "DeletionProtection": false, "HttpEndpointEnabled": false, "CopyTagsToSnapshot": true, "CrossAccountClone": false, "DomainMemberships": [] } } For more information, see `Modifying an Amazon Aurora DB Cluster <https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Aurora.Modifying.html>`__ in the *Amazon Aurora User Guide*. **Example 2: To associate VPC security group with a DB cluster** The following ``modify-db-instance`` example associates a specific VPC security group and removes DB security groups from a DB cluster. :: aws rds modify-db-cluster \ --db-cluster-identifier dbName \ --vpc-security-group-ids sg-ID Output:: { "DBCluster": { "AllocatedStorage": 1, "AvailabilityZones": [ "us-west-2c", "us-west-2b", "us-west-2a" ], "BackupRetentionPeriod": 1, "DBClusterIdentifier": "dbName", "DBClusterParameterGroup": "default.aurora-mysql8.0", "DBSubnetGroup": "default", "Status": "available", "EarliestRestorableTime": "2024-02-15T01:12:13.966000+00:00", "Endpoint": "dbName.cluster-abcdefghji.us-west-2.rds.amazonaws.com", "ReaderEndpoint": "dbName.cluster-ro-abcdefghji.us-west-2.rds.amazonaws.com", "MultiAZ": false, "Engine": "aurora-mysql", "EngineVersion": "8.0.mysql_aurora.3.04.1", "LatestRestorableTime": "2024-02-15T02:25:33.696000+00:00", "Port": 3306, "MasterUsername": "admin", "PreferredBackupWindow": "10:59-11:29", "PreferredMaintenanceWindow": "thu:08:54-thu:09:24", "ReadReplicaIdentifiers": [], "DBClusterMembers": [ { "DBInstanceIdentifier": "dbName-instance-1", "IsClusterWriter": true, "DBClusterParameterGroupStatus": "in-sync", "PromotionTier": 1 } ], "VpcSecurityGroups": [ { "VpcSecurityGroupId": "sg-ID", "Status": "active" } ], ...output omitted... } } For more information, see `Controlling access with security groups <https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Overview.RDSSecurityGroups.html>`__ in the *Amazon Aurora User Guide*.