ServiceDiscovery / Client / get_instance

get_instance#

ServiceDiscovery.Client.get_instance(**kwargs)#

Gets information about a specified instance.

See also: AWS API Documentation

Request Syntax

response = client.get_instance(
    ServiceId='string',
    InstanceId='string'
)
Parameters:

  • ServiceId (string) –

    [REQUIRED]

    The ID of the service that the instance is associated with.

  • InstanceId (string) –

    [REQUIRED]

    The ID of the instance that you want to get information about.

Return type:

dict

Returns:

Response Syntax

{
    'Instance': {
        'Id': 'string',
        'CreatorRequestId': 'string',
        'Attributes': {
            'string': 'string'
        }
    }
}

Response Structure

  • (dict) –

    • Instance (dict) –

      A complex type that contains information about a specified instance.

      • Id (string) –

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

        • If the service that’s 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’s unique among instances that you register by using the same service.

        • If you specify an existing InstanceId and ServiceId, Cloud Map updates the existing DNS records. If there’s also an existing health check, Cloud Map 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.

      • CreatorRequestId (string) –

        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).

      • Attributes (dict) –

        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.

        Note

        Do not include sensitive information in the attributes if the namespace is discoverable by public DNS queries.

        Supported attribute keys include the following:

        AWS_ALIAS_DNS_NAME

        If you want Cloud Map to create a Route 53 alias record that routes traffic to an Elastic Load Balancing load balancer, specify the DNS name that’s associated with the load balancer. For information about how to get the DNS name, see AliasTarget->DNSName in the Route 53 API Reference.

        Note the following:

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

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

        • If the service that’s specified by ServiceId includes HealthCheckConfig settings, Cloud Map creates 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 Amazon Web Services 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_EC2_INSTANCE_ID

        HTTP namespaces only. The Amazon EC2 instance ID for the instance. The AWS_INSTANCE_IPV4 attribute contains the primary private IPv4 address.

        AWS_INIT_HEALTH_STATUS

        If the service configuration includes HealthCheckCustomConfig, you can optionally use AWS_INIT_HEALTH_STATUS to specify the initial status of the custom health check, HEALTHY or UNHEALTHY. If you don’t specify a value for AWS_INIT_HEALTH_STATUS, the initial status is HEALTHY.

        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 or a Route 53 health check when you created the service.

        • (string) –

          • (string) –

Exceptions

  • ServiceDiscovery.Client.exceptions.InstanceNotFound

  • ServiceDiscovery.Client.exceptions.InvalidInput

  • ServiceDiscovery.Client.exceptions.ServiceNotFound

Examples

This example gets information about a specified instance.

response = client.get_instance(
    InstanceId='i-abcd1234',
    ServiceId='srv-e4anhexample0004',
)

print(response)

Expected Output:

{
    'Instance': {
        'Attributes': {
            'AWS_INSTANCE_IPV4': '192.0.2.44',
            'AWS_INSTANCE_PORT': '80',
            'color': 'green',
            'region': 'us-west-2',
            'stage': 'beta',
        },
        'Id': 'i-abcd1234',
    },
    'ResponseMetadata': {
        '...': '...',
    },
}