# rds-multi-az-support
<a name="rds-multi-az-support"></a>

Checks whether high availability is enabled for your RDS DB instances.

In a Multi-AZ deployment, Amazon RDS automatically provisions and maintains a synchronous standby replica in a different Availability Zone. For more information, see [High Availability (Multi-AZ)](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.MultiAZ.html) in the *Amazon RDS User Guide*.

**Note**  
This rule does not evaluate Amazon Aurora DB, Amazon DocumentDB, and Amazon Neptune DB instances.



**Identifier:** RDS\$1MULTI\$1AZ\$1SUPPORT

**Resource Types:** AWS::RDS::DBInstance

**Trigger type:** Configuration changes

**AWS Region:** All supported AWS regions

**Parameters:**

None  

## Proactive Evaluation
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 For steps on how to run this rule in proactive mode, see [Evaluating Your Resources with AWS Config Rules](./evaluating-your-resources.html#evaluating-your-resources-proactive). For this rule to return COMPLIANT in proactive mode, the resource configuration schema for the [StartResourceEvaluation](https://docs.aws.amazon.com/config/latest/APIReference/API_StartResourceEvaluation.html) API needs to include the following inputs, encoded as a string: 

```
"ResourceConfiguration":
...
{
    "MultiAZ": BOOLEAN*,
    "Engine": String*
} 
...
```

\$1For more information on valid values for these inputs, see [MultiAZ](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-rds-dbinstance.html#cfn-rds-dbinstance-multiaz) and [Engine](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-rds-dbinstance.html#cfn-rds-dbinstance-engine) in the AWS CloudFormation User Guide.

 For more information on proactive evaluation, see [Evaluation Mode](./evaluate-config-rules.html). 

## AWS CloudFormation template
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To create AWS Config managed rules with AWS CloudFormation templates, see [Creating AWS Config Managed Rules With AWS CloudFormation Templates](aws-config-managed-rules-cloudformation-templates.md).