HealthCheckConfig - AWS Cloud Map
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HealthCheckConfig

Public DNS and HTTP namespaces only. A complex type that contains settings for an optional health check. If you specify settings for a health check, AWS Cloud Map associates the health check with the records that you specify in DnsConfig.

Important

If you specify a health check configuration, you can specify either HealthCheckCustomConfig or HealthCheckConfig but not both.

Health checks are basic Route 53 health checks that monitor an AWS endpoint. For information about pricing for health checks, see Amazon Route 53 Pricing.

Note the following about configuring health checks.

A and AAAA records

If DnsConfig includes configurations for both A and AAAA records, AWS Cloud Map creates a health check that uses the IPv4 address to check the health of the resource. If the endpoint tthat's specified by the IPv4 address is unhealthy, Route 53 considers both the A and AAAA records to be unhealthy.

CNAME records

You can't specify settings for HealthCheckConfig when the DNSConfig includes CNAME for the value of Type. If you do, the CreateService request will fail with an InvalidInput error.

Request interval

A Route 53 health checker in each health-checking AWS Region sends a health check request to an endpoint every 30 seconds. On average, your endpoint receives a health check request about every two seconds. However, health checkers don't coordinate with one another. Therefore, you might sometimes see several requests in one second that's followed by a few seconds with no health checks at all.

Health checking regions

Health checkers perform checks from all Route 53 health-checking Regions. For a list of the current Regions, see Regions.

Alias records

When you register an instance, if you include the AWS_ALIAS_DNS_NAME attribute, AWS Cloud Map creates a Route 53 alias record. Note the following:

  • Route 53 automatically sets EvaluateTargetHealth to true for alias records. When EvaluateTargetHealth is true, the alias record inherits the health of the referenced AWS resource. such as an ELB load balancer. For more information, see EvaluateTargetHealth.

  • If you include HealthCheckConfig and then use the service to register an instance that creates an alias record, Route 53 doesn't create the health check.

Charges for health checks

Health checks are basic Route 53 health checks that monitor an AWS endpoint. For information about pricing for health checks, see Amazon Route 53 Pricing.

Contents

Type

The type of health check that you want to create, which indicates how Route 53 determines whether an endpoint is healthy.

Important

You can't change the value of Type after you create a health check.

You can create the following types of health checks:

  • HTTP: Route 53 tries to establish a TCP connection. If successful, Route 53 submits an HTTP request and waits for an HTTP status code of 200 or greater and less than 400.

  • HTTPS: Route 53 tries to establish a TCP connection. If successful, Route 53 submits an HTTPS request and waits for an HTTP status code of 200 or greater and less than 400.

    Important

    If you specify HTTPS for the value of Type, the endpoint must support TLS v1.0 or later.

  • TCP: Route 53 tries to establish a TCP connection.

    If you specify TCP for Type, don't specify a value for ResourcePath.

For more information, see How Route 53 Determines Whether an Endpoint Is Healthy in the Route 53 Developer Guide.

Type: String

Valid Values: HTTP | HTTPS | TCP

Required: Yes

FailureThreshold

The number of consecutive health checks that an endpoint must pass or fail for Route 53 to change the current status of the endpoint from unhealthy to healthy or the other way around. For more information, see How Route 53 Determines Whether an Endpoint Is Healthy in the Route 53 Developer Guide.

Type: Integer

Valid Range: Minimum value of 1. Maximum value of 10.

Required: No

ResourcePath

The path that you want Route 53 to request when performing health checks. The path can be any value that your endpoint returns an HTTP status code of a 2xx or 3xx format for when the endpoint is healthy. An example file is /docs/route53-health-check.html. Route 53 automatically adds the DNS name for the service. If you don't specify a value for ResourcePath, the default value is /.

If you specify TCP for Type, you must not specify a value for ResourcePath.

Type: String

Length Constraints: Maximum length of 255.

Required: No

See Also

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