Amazon Route 53
API Reference

RegisterInstance

Creates or updates one or more records and, optionally, creates a health check based on the settings in a specified service. When you submit a RegisterInstance request, the following occurs:

  • For each DNS record that you define in the service that is specified by ServiceId, a record is created or updated in the hosted zone that is associated with the corresponding namespace.

  • If the service includes HealthCheckConfig, a health check is created based on the settings in the health check configuration.

  • The health check, if any, is associated with each of the new or updated records.

Important

One RegisterInstance request must complete before you can submit another request and specify the same service ID and instance ID.

For more information, see CreateService.

When Route 53 receives a DNS query for the specified DNS name, it returns the applicable value:

  • If the health check is healthy: returns all the records

  • If the health check is unhealthy: returns the applicable value for the last healthy instance

  • If you didn't specify a health check configuration: returns all the records

For the current limit on the number of instances that you can register using the same namespace and using the same service, see Limits on Auto Naming in the Route 53 Developer Guide.

Request Syntax

{ "Attributes": { "string" : "string" }, "CreatorRequestId": "string", "InstanceId": "string", "ServiceId": "string" }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

Attributes

A string map that contains the following information for the service that you specify in ServiceId:

  • The attributes that apply to the records that are defined in the service.

  • For each attribute, the applicable value.

Supported attribute keys include the following:

AWS_ALIAS_DNS_NAME

If you want Route 53 to create an alias record that routes traffic to an Elastic Load Balancing load balancer, specify the DNS name that is associated with the load balancer. For information about how to get the DNS name, see "DNSName" in the topic AliasTarget.

Note the following:

  • The configuration for the service that is specified by ServiceId must include settings for an A record, an AAAA record, or both.

  • In the service that is specified by ServiceId, the value of RoutingPolicy must be WEIGHTED.

  • If the service that is specified by ServiceId includes HealthCheckConfig settings, Route 53 will create the health check, but it won't associate the health check with the alias record.

  • Auto naming currently doesn't support creating alias records that route traffic to AWS resources other than ELB load balancers.

  • If you specify a value for AWS_ALIAS_DNS_NAME, don't specify values for any of the AWS_INSTANCE attributes.

AWS_INSTANCE_CNAME

If the service configuration includes a CNAME record, the domain name that you want Route 53 to return in response to DNS queries, for example, example.com.

This value is required if the service specified by ServiceId includes settings for an CNAME record.

AWS_INSTANCE_IPV4

If the service configuration includes an A record, the IPv4 address that you want Route 53 to return in response to DNS queries, for example, 192.0.2.44.

This value is required if the service specified by ServiceId includes settings for an A record. If the service includes settings for an SRV record, you must specify a value for AWS_INSTANCE_IPV4, AWS_INSTANCE_IPV6, or both.

AWS_INSTANCE_IPV6

If the service configuration includes an AAAA record, the IPv6 address that you want Route 53 to return in response to DNS queries, for example, 2001:0db8:85a3:0000:0000:abcd:0001:2345.

This value is required if the service specified by ServiceId includes settings for an AAAA record. If the service includes settings for an SRV record, you must specify a value for AWS_INSTANCE_IPV4, AWS_INSTANCE_IPV6, or both.

AWS_INSTANCE_PORT

If the service includes an SRV record, the value that you want Route 53 to return for the port.

If the service includes HealthCheckConfig, the port on the endpoint that you want Route 53 to send requests to.

This value is required if you specified settings for an SRV record when you created the service.

Type: String to string map

Key Length Constraints: Maximum length of 255.

Value Length Constraints: Maximum length of 255.

Required: Yes

CreatorRequestId

A unique string that identifies the request and that allows failed RegisterInstance requests to be retried without the risk of executing the operation twice. You must use a unique CreatorRequestId string every time you submit a RegisterInstance request if you're registering additional instances for the same namespace and service. CreatorRequestId can be any unique string, for example, a date/time stamp.

Type: String

Length Constraints: Maximum length of 64.

Required: No

InstanceId

An identifier that you want to associate with the instance. Note the following:

  • If the service that is specified by ServiceId includes settings for an SRV record, the value of InstanceId is automatically included as part of the value for the SRV record. For more information, see DnsRecord:Type.

  • You can use this value to update an existing instance.

  • To register a new instance, you must specify a value that is unique among instances that you register by using the same service.

  • If you specify an existing InstanceId and ServiceId, Route 53 updates the existing records. If there's also an existing health check, Route 53 deletes the old health check and creates a new one.

    Note

    The health check isn't deleted immediately, so it will still appear for a while if you submit a ListHealthChecks request, for example.

Type: String

Length Constraints: Maximum length of 64.

Required: Yes

ServiceId

The ID of the service that you want to use for settings for the records and health check that Route 53 will create.

Type: String

Length Constraints: Maximum length of 64.

Required: Yes

Response Syntax

{ "OperationId": "string" }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

OperationId

A value that you can use to determine whether the request completed successfully. To get the status of the operation, see GetOperation.

Type: String

Length Constraints: Maximum length of 255.

Errors

For information about the errors that are common to all actions, see Common Errors.

DuplicateRequest

The operation is already in progress.

HTTP Status Code: 400

InvalidInput

One or more specified values aren't valid. For example, a required value might be missing, a numeric value might be outside the allowed range, or a string value might exceed length constraints.

HTTP Status Code: 400

ResourceInUse

The specified resource can't be deleted because it contains other resources. For example, you can't delete a service that contains any instances.

HTTP Status Code: 400

ResourceLimitExceeded

The resource can't be created because you've reached the limit on the number of resources.

HTTP Status Code: 400

ServiceNotFound

No service exists with the specified ID.

HTTP Status Code: 400

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: