AWS CloudFormation
User Guide (Version )

AWS::ElasticLoadBalancing::LoadBalancer HealthCheck

Specifies health check settings for your Classic Load Balancer.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{ "HealthyThreshold" : String, "Interval" : String, "Target" : String, "Timeout" : String, "UnhealthyThreshold" : String }

YAML

HealthyThreshold: String Interval: String Target: String Timeout: String UnhealthyThreshold: String

Properties

HealthyThreshold

The number of consecutive health checks successes required before moving the instance to the Healthy state.

Required: Yes

Type: String

Minimum: 2

Maximum: 10

Update requires: No interruption

Interval

The approximate interval, in seconds, between health checks of an individual instance.

Required: Yes

Type: String

Minimum: 5

Maximum: 300

Update requires: No interruption

Target

The instance being checked. The protocol is either TCP, HTTP, HTTPS, or SSL. The range of valid ports is one (1) through 65535.

TCP is the default, specified as a TCP: port pair, for example "TCP:5000". In this case, a health check simply attempts to open a TCP connection to the instance on the specified port. Failure to connect within the configured timeout is considered unhealthy.

SSL is also specified as SSL: port pair, for example, SSL:5000.

For HTTP/HTTPS, you must include a ping path in the string. HTTP is specified as a HTTP:port;/;PathToPing; grouping, for example "HTTP:80/weather/us/wa/seattle". In this case, a HTTP GET request is issued to the instance on the given port and path. Any answer other than "200 OK" within the timeout period is considered unhealthy.

The total length of the HTTP ping target must be 1024 16-bit Unicode characters or less.

Required: Yes

Type: String

Update requires: No interruption

Timeout

The amount of time, in seconds, during which no response means a failed health check.

This value must be less than the Interval value.

Required: Yes

Type: String

Minimum: 2

Maximum: 60

Update requires: No interruption

UnhealthyThreshold

The number of consecutive health check failures required before moving the instance to the Unhealthy state.

Required: Yes

Type: String

Minimum: 2

Maximum: 10

Update requires: No interruption

See Also

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