Resource: HealthCheck
Represents a health check resource.
Google Compute Engine has two health check resources:
These health check resources can be used for load balancing and for autohealing VMs in a managed instance group (MIG).
Load balancing
Health check requirements vary depending on the type of load balancer. For details about the type of health check supported for each load balancer and corresponding backend type, see Health checks overview: Load balancer guide .
Autohealing in MIGs
The health checks that you use for autohealing VMs in a MIG can be either regional or global. For more information, see Set up an application health check and autohealing .
For more information, see Health checks overview .
JSON representation |
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{ "kind" : string , "id" : string , "creationTimestamp" : string , "name" : string , "description" : string , "checkIntervalSec" : integer , "timeoutSec" : integer , "unhealthyThreshold" : integer , "healthyThreshold" : integer , "type" : enum , "tcpHealthCheck" : { "port" : integer , "portName" : string , "portSpecification" : enum , "request" : string , "response" : string , "proxyHeader" : enum } , "sslHealthCheck" : { "port" : integer , "portName" : string , "portSpecification" : enum , "request" : string , "response" : string , "proxyHeader" : enum } , "httpHealthCheck" : { "port" : integer , "portName" : string , "portSpecification" : enum , "host" : string , "requestPath" : string , "proxyHeader" : enum , "response" : string } , "httpsHealthCheck" : { "port" : integer , "portName" : string , "portSpecification" : enum , "host" : string , "requestPath" : string , "proxyHeader" : enum , "response" : string } , "http2HealthCheck" : { "port" : integer , "portName" : string , "portSpecification" : enum , "host" : string , "requestPath" : string , "proxyHeader" : enum , "response" : string } , "grpcHealthCheck" : { "port" : integer , "portName" : string , "portSpecification" : enum , "grpcServiceName" : string } , "sourceRegions" : [ string ] , "selfLink" : string , "region" : string , "logConfig" : { "enable" : boolean } } |
kind
string
Type of the resource.
id
string ( uint64
format)
[Output Only] The unique identifier for the resource. This identifier is defined by the server.
name
string
Name of the resource. Provided by the client when the resource is created. The name must be 1-63 characters long, and comply with RFC1035
. For example, a name that is 1-63 characters long, matches the regular expression [a-z]([-a-z0-9]*[a-z0-9])?
, and otherwise complies with RFC1035. This regular expression describes a name where the first character is a lowercase letter, and all following characters are a dash, lowercase letter, or digit, except the last character, which isn't a dash.
description
string
An optional description of this resource. Provide this property when you create the resource.
checkIntervalSec
integer
How often (in seconds) to send a health check. The default value is 5 seconds.
timeoutSec
integer
How long (in seconds) to wait before claiming failure. The default value is 5 seconds. It is invalid for timeoutSec
to have greater value than checkIntervalSec
.
unhealthyThreshold
integer
A so-far healthy instance will be marked unhealthy after this many consecutive failures. The default value is 2.
healthyThreshold
integer
A so-far unhealthy instance will be marked healthy after this many consecutive successes. The default value is 2.
type
enum
Specifies the type of the healthCheck, either TCP
, SSL
, HTTP
, HTTPS
, HTTP2
or GRPC
. Exactly one of the protocol-specific health check fields must be specified, which must match type
field.
tcpHealthCheck
object
tcpHealthCheck.port
integer
The TCP port number to which the health check prober sends packets. The default value is 80
. Valid values are 1
through 65535
.
tcpHealthCheck.portName
string
Not supported.
tcpHealthCheck.portSpecification
enum
Specifies how a port is selected for health checking. Can be one of the following values:
USE_FIXED_PORT
: Specifies a port number explicitly using the port
field in the health check. Supported by backend services for passthrough load balancers and backend services for proxy load balancers. Not supported by target pools. The health check supports all backends supported by the backend service provided the backend can be health checked. For example, GCE_VM_IP
network endpoint groups, GCE_VM_IP_PORT
network endpoint groups, and instance group backends.
USE_NAMED_PORT
: Not supported.
USE_SERVING_PORT
: Provides an indirect method of specifying the health check port by referring to the backend service. Only supported by backend services for proxy load balancers. Not supported by target pools. Not supported by backend services for passthrough load balancers. Supports all backends that can be health checked; for example, GCE_VM_IP_PORT
network endpoint groups and instance group backends.
For GCE_VM_IP_PORT
network endpoint group backends, the health check uses the port number specified for each endpoint in the network endpoint group. For instance group backends, the health check uses the port number determined by looking up the backend service's named port in the instance group's list of named ports.
tcpHealthCheck.request
string
Instructs the health check prober to send this exact ASCII string, up to 1024 bytes in length, after establishing the TCP connection.
tcpHealthCheck.response
string
Creates a content-based TCP health check. In addition to establishing a TCP connection, you can configure the health check to pass only when the backend sends this exact response ASCII string, up to 1024 bytes in length. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#criteria-protocol-ssl-tcp
tcpHealthCheck.proxyHeader
enum
Specifies the type of proxy header to append before sending data to the backend, either NONE
or PROXY_V1
. The default is NONE
.
sslHealthCheck
object
sslHealthCheck.port
integer
The TCP port number to which the health check prober sends packets. The default value is 443
. Valid values are 1
through 65535
.
sslHealthCheck.portName
string
Not supported.
sslHealthCheck.portSpecification
enum
Specifies how a port is selected for health checking. Can be one of the following values:
USE_FIXED_PORT
: Specifies a port number explicitly using the port
field in the health check. Supported by backend services for passthrough load balancers and backend services for proxy load balancers. Not supported by target pools. The health check supports all backends supported by the backend service provided the backend can be health checked. For example, GCE_VM_IP
network endpoint groups,
GCE_VM_IP_PORT
network endpoint groups, and instance group backends.
USE_NAMED_PORT
: Not supported.
USE_SERVING_PORT
: Provides an indirect method of specifying the health check port by referring to the backend service. Only supported by backend services for proxy load balancers. Not supported by target pools. Not supported by backend services for passthrough load balancers. Supports all backends that can be health checked; for example, GCE_VM_IP_PORT
network endpoint groups and instance group backends.
For GCE_VM_IP_PORT
network endpoint group backends, the health check uses the port number specified for each endpoint in the network endpoint group. For instance group backends, the health check uses the port number determined by looking up the backend service's named port in the instance group's list of named ports.
sslHealthCheck.request
string
Instructs the health check prober to send this exact ASCII string, up to 1024 bytes in length, after establishing the TCP connection and SSL handshake.
sslHealthCheck.response
string
Creates a content-based SSL health check. In addition to establishing a TCP connection and the TLS handshake, you can configure the health check to pass only when the backend sends this exact response ASCII string, up to 1024 bytes in length. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#criteria-protocol-ssl-tcp
sslHealthCheck.proxyHeader
enum
Specifies the type of proxy header to append before sending data to the backend, either NONE
or PROXY_V1
. The default is NONE
.
httpHealthCheck
object
httpHealthCheck.port
integer
The TCP port number to which the health check prober sends packets. The default value is 80
. Valid values are 1
through 65535
.
httpHealthCheck.portName
string
Not supported.
httpHealthCheck.portSpecification
enum
Specifies how a port is selected for health checking. Can be one of the following values:
USE_FIXED_PORT
: Specifies a port number explicitly using the port
field in the health check. Supported by backend services for passthrough load balancers and backend services for proxy load balancers. Also supported in legacy HTTP health checks for target pools. The health check supports all backends supported by the backend service provided the backend can be health checked. For example, GCE_VM_IP
network endpoint groups,
GCE_VM_IP_PORT
network endpoint groups, and instance group backends.
USE_NAMED_PORT
: Not supported.
USE_SERVING_PORT
: Provides an indirect method of specifying the health check port by referring to the backend service. Only supported by backend services for proxy load balancers. Not supported by target pools. Not supported by backend services for pass-through load balancers. Supports all backends that can be health checked; for example, GCE_VM_IP_PORT
network endpoint groups and instance group backends.
For GCE_VM_IP_PORT
network endpoint group backends, the health check uses the port number specified for each endpoint in the network endpoint group. For instance group backends, the health check uses the port number determined by looking up the backend service's named port in the instance group's list of named ports.
httpHealthCheck.host
string
The value of the host header in the HTTP health check request. If left empty (default value), the host header is set to the destination IP address to which health check packets are sent. The destination IP address depends on the type of load balancer. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#hc-packet-dest
httpHealthCheck.requestPath
string
The request path of the HTTP health check request. The default value is /
. Must comply with RFC3986
.
httpHealthCheck.proxyHeader
enum
Specifies the type of proxy header to append before sending data to the backend, either NONE
or PROXY_V1
. The default is NONE
.
httpHealthCheck.response
string
Creates a content-based HTTP health check. In addition to the required HTTP 200 (OK) status code, you can configure the health check to pass only when the backend sends this specific ASCII response string within the first 1024 bytes of the HTTP response body. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#criteria-protocol-http
httpsHealthCheck
object
httpsHealthCheck.port
integer
The TCP port number to which the health check prober sends packets. The default value is 443
. Valid values are 1
through 65535
.
httpsHealthCheck.portName
string
Not supported.
httpsHealthCheck.portSpecification
enum
Specifies how a port is selected for health checking. Can be one of the following values:
USE_FIXED_PORT
: Specifies a port number explicitly using the port
field in the health check. Supported by backend services for passthrough load balancers and backend services for proxy load balancers. Not supported by target pools. The health check supports all backends supported by the backend service provided the backend can be health checked. For example, GCE_VM_IP
network endpoint groups,
GCE_VM_IP_PORT
network endpoint groups, and instance group backends.
USE_NAMED_PORT
: Not supported.
USE_SERVING_PORT
: Provides an indirect method of specifying the health check port by referring to the backend service. Only supported by backend services for proxy load balancers. Not supported by target pools. Not supported by backend services for passthrough load balancers. Supports all backends that can be health checked; for example, GCE_VM_IP_PORT
network endpoint groups and instance group backends.
For GCE_VM_IP_PORT
network endpoint group backends, the health check uses the port number specified for each endpoint in the network endpoint group. For instance group backends, the health check uses the port number determined by looking up the backend service's named port in the instance group's list of named ports.
httpsHealthCheck.host
string
The value of the host header in the HTTPS health check request. If left empty (default value), the host header is set to the destination IP address to which health check packets are sent. The destination IP address depends on the type of load balancer. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#hc-packet-dest
httpsHealthCheck.requestPath
string
The request path of the HTTPS health check request. The default value is /
. Must comply with RFC3986
.
httpsHealthCheck.proxyHeader
enum
Specifies the type of proxy header to append before sending data to the backend, either NONE
or PROXY_V1
. The default is NONE
.
httpsHealthCheck.response
string
Creates a content-based HTTPS health check. In addition to the required HTTP 200 (OK) status code, you can configure the health check to pass only when the backend sends this specific ASCII response string within the first 1024 bytes of the HTTP response body. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#criteria-protocol-http
http2HealthCheck
object
http2HealthCheck.port
integer
The TCP port number to which the health check prober sends packets. The default value is 443
. Valid values are 1
through 65535
.
http2HealthCheck.portName
string
Not supported.
http2HealthCheck.portSpecification
enum
Specifies how a port is selected for health checking. Can be one of the following values:
USE_FIXED_PORT
: Specifies a port number explicitly using the port
field in the health check. Supported by backend services for passthrough load balancers and backend services for proxy load balancers. Not supported by target pools. The health check supports all backends supported by the backend service provided the backend can be health checked. For example, GCE_VM_IP
network endpoint groups,
GCE_VM_IP_PORT
network endpoint groups, and instance group backends.
USE_NAMED_PORT
: Not supported.
USE_SERVING_PORT
: Provides an indirect method of specifying the health check port by referring to the backend service. Only supported by backend services for proxy load balancers. Not supported by target pools. Not supported by backend services for passthrough load balancers. Supports all backends that can be health checked; for example, GCE_VM_IP_PORT
network endpoint groups and instance group backends.
For GCE_VM_IP_PORT
network endpoint group backends, the health check uses the port number specified for each endpoint in the network endpoint group. For instance group backends, the health check uses the port number determined by looking up the backend service's named port in the instance group's list of named ports.
http2HealthCheck.host
string
The value of the host header in the HTTP/2 health check request. If left empty (default value), the host header is set to the destination IP address to which health check packets are sent. The destination IP address depends on the type of load balancer. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#hc-packet-dest
http2HealthCheck.requestPath
string
The request path of the HTTP/2 health check request. The default value is /
. Must comply with RFC3986
.
http2HealthCheck.proxyHeader
enum
Specifies the type of proxy header to append before sending data to the backend, either NONE
or PROXY_V1
. The default is NONE
.
http2HealthCheck.response
string
Creates a content-based HTTP/2 health check. In addition to the required HTTP 200 (OK) status code, you can configure the health check to pass only when the backend sends this specific ASCII response string within the first 1024 bytes of the HTTP response body. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#criteria-protocol-http
grpcHealthCheck
object
grpcHealthCheck.port
integer
The TCP port number to which the health check prober sends packets. Valid values are 1
through 65535
.
grpcHealthCheck.portName
string
Not supported.
grpcHealthCheck.portSpecification
enum
Specifies how a port is selected for health checking. Can be one of the following values:
USE_FIXED_PORT
: Specifies a port number explicitly using the port
field in the health check. Supported by backend services for passthrough load balancers and backend services for proxy load balancers. Not supported by target pools. The health check supports all backends supported by the backend service provided the backend can be health checked. For example, GCE_VM_IP
network endpoint groups,
GCE_VM_IP_PORT
network endpoint groups, and instance group backends.
USE_NAMED_PORT
: Not supported.
USE_SERVING_PORT
: Provides an indirect method of specifying the health check port by referring to the backend service. Only supported by backend services for proxy load balancers. Not supported by target pools. Not supported by backend services for passthrough load balancers. Supports all backends that can be health checked; for example, GCE_VM_IP_PORT
network endpoint groups and instance group backends.
For GCE_VM_IP_PORT
network endpoint group backends, the health check uses the port number specified for each endpoint in the network endpoint group. For instance group backends, the health check uses the port number determined by looking up the backend service's named port in the instance group's list of named ports.
grpcHealthCheck.grpcServiceName
string
The gRPC service name for the health check. This field is optional. The value of grpcServiceName has the following meanings by convention:
- Empty serviceName means the overall status of all services at the backend.- Non-empty serviceName means the health of that gRPC service, as defined by the owner of the service.
The grpcServiceName can only be ASCII.
sourceRegions[]
string
The list of cloud regions from which health checks are performed. If any regions are specified, then exactly 3 regions should be specified. The region names must be valid names of Google Cloud regions. This can only be set for global health check. If this list is non-empty, then there are restrictions on what other health check fields are supported and what other resources can use this health check:
- SSL, HTTP2, and GRPC protocols are not supported.
- The TCP
request
field is not supported. - The
proxyHeader
field for HTTP, HTTPS, and TCP is not supported
. - The
checkIntervalSec
field must be at least 30. - The health check cannot be used with BackendService nor with managed instance group auto-healing.
selfLink
string
[Output Only] Server-defined URL for the resource.
region
string
[Output Only] Region where the health check resides. Not applicable to global health checks.
logConfig
object
Configure logging on this health check.
logConfig.enable
boolean
Indicates whether or not to export logs. This is false by default, which means no health check logging will be done.
Methods |
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Deletes the specified HealthCheck resource. |
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Returns the specified HealthCheck resource. |
|
Creates a HealthCheck resource in the specified project using the data included in the request. |
|
Retrieves the list of HealthCheck resources available to the specified project. |
|
Updates a HealthCheck resource in the specified project using the data included in the request. |
|
Updates a HealthCheck resource in the specified project using the data included in the request. |