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---
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subcategory: "Compute Engine"
description: |-
Health Checks determine whether instances are responsive and able to do work.
---
# google_compute_health_check
Health Checks determine whether instances are responsive and able to do work.
They are an important part of a comprehensive load balancing configuration,
as they enable monitoring instances behind load balancers.
Health Checks poll instances at a specified interval. Instances that
do not respond successfully to some number of probes in a row are marked
as unhealthy. No new connections are sent to unhealthy instances,
though existing connections will continue. The health check will
continue to poll unhealthy instances. If an instance later responds
successfully to some number of consecutive probes, it is marked
healthy again and can receive new connections.
~>**NOTE**: Legacy HTTP(S) health checks must be used for target pool-based network
load balancers. See the [official guide](https://cloud.google.com/load-balancing/docs/health-check-concepts#selecting_hc)
for choosing a type of health check.
To get more information about HealthCheck, see:
* [API documentation](https://cloud.google.com/compute/docs/reference/rest/v1/healthChecks)
* How-to Guides
* [Official Documentation](https://cloud.google.com/load-balancing/docs/health-checks)
<div class = "oics-button" style="float: right; margin: 0 0 -15px">
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<img alt="Open in Cloud Shell" src="//gstatic.com/cloudssh/images/open-btn.svg" style="max-height: 44px; margin: 32px auto; max-width: 100%;">
</a>
</div>
## Example Usage - Health Check Tcp
```hcl
resource "google_compute_health_check" "tcp-health-check" {
name = "tcp-health-check"
timeout_sec = 1
check_interval_sec = 1
tcp_health_check {
port = "80"
}
}
```
<div class = "oics-button" style="float: right; margin: 0 0 -15px">
<a href="https://console.cloud.google.com/cloudshell/open?cloudshell_git_repo=https%3A%2F%2Fgithub.com%2Fterraform-google-modules%2Fdocs-examples.git&cloudshell_image=gcr.io%2Fcloudshell-images%2Fcloudshell%3Alatest&cloudshell_print=.%2Fmotd&cloudshell_tutorial=.%2Ftutorial.md&cloudshell_working_dir=health_check_tcp_full&open_in_editor=main.tf" target="_blank">
<img alt="Open in Cloud Shell" src="//gstatic.com/cloudssh/images/open-btn.svg" style="max-height: 44px; margin: 32px auto; max-width: 100%;">
</a>
</div>
## Example Usage - Health Check Tcp Full
```hcl
resource "google_compute_health_check" "tcp-health-check" {
name = "tcp-health-check"
description = "Health check via tcp"
timeout_sec = 1
check_interval_sec = 1
healthy_threshold = 4
unhealthy_threshold = 5
tcp_health_check {
port_name = "health-check-port"
port_specification = "USE_NAMED_PORT"
request = "ARE YOU HEALTHY?"
proxy_header = "NONE"
response = "I AM HEALTHY"
}
}
```
<div class = "oics-button" style="float: right; margin: 0 0 -15px">
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<img alt="Open in Cloud Shell" src="//gstatic.com/cloudssh/images/open-btn.svg" style="max-height: 44px; margin: 32px auto; max-width: 100%;">
</a>
</div>
## Example Usage - Health Check Ssl
```hcl
resource "google_compute_health_check" "ssl-health-check" {
name = "ssl-health-check"
timeout_sec = 1
check_interval_sec = 1
ssl_health_check {
port = "443"
}
}
```
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<img alt="Open in Cloud Shell" src="//gstatic.com/cloudssh/images/open-btn.svg" style="max-height: 44px; margin: 32px auto; max-width: 100%;">
</a>
</div>
## Example Usage - Health Check Ssl Full
```hcl
resource "google_compute_health_check" "ssl-health-check" {
name = "ssl-health-check"
description = "Health check via ssl"
timeout_sec = 1
check_interval_sec = 1
healthy_threshold = 4
unhealthy_threshold = 5
ssl_health_check {
port_name = "health-check-port"
port_specification = "USE_NAMED_PORT"
request = "ARE YOU HEALTHY?"
proxy_header = "NONE"
response = "I AM HEALTHY"
}
}
```
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<img alt="Open in Cloud Shell" src="//gstatic.com/cloudssh/images/open-btn.svg" style="max-height: 44px; margin: 32px auto; max-width: 100%;">
</a>
</div>
## Example Usage - Health Check Http
```hcl
resource "google_compute_health_check" "http-health-check" {
name = "http-health-check"
timeout_sec = 1
check_interval_sec = 1
http_health_check {
port = 80
}
}
```
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</a>
</div>
## Example Usage - Health Check Http Full
```hcl
resource "google_compute_health_check" "http-health-check" {
name = "http-health-check"
description = "Health check via http"
timeout_sec = 1
check_interval_sec = 1
healthy_threshold = 4
unhealthy_threshold = 5
http_health_check {
port_name = "health-check-port"
port_specification = "USE_NAMED_PORT"
host = "1.2.3.4"
request_path = "/mypath"
proxy_header = "NONE"
response = "I AM HEALTHY"
}
}
```
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</a>
</div>
## Example Usage - Health Check Https
```hcl
resource "google_compute_health_check" "https-health-check" {
name = "https-health-check"
timeout_sec = 1
check_interval_sec = 1
https_health_check {
port = "443"
}
}
```
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</a>
</div>
## Example Usage - Health Check Https Full
```hcl
resource "google_compute_health_check" "https-health-check" {
name = "https-health-check"
description = "Health check via https"
timeout_sec = 1
check_interval_sec = 1
healthy_threshold = 4
unhealthy_threshold = 5
https_health_check {
port_name = "health-check-port"
port_specification = "USE_NAMED_PORT"
host = "1.2.3.4"
request_path = "/mypath"
proxy_header = "NONE"
response = "I AM HEALTHY"
}
}
```
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</a>
</div>
## Example Usage - Health Check Http2
```hcl
resource "google_compute_health_check" "http2-health-check" {
name = "http2-health-check"
timeout_sec = 1
check_interval_sec = 1
http2_health_check {
port = "443"
}
}
```
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<img alt="Open in Cloud Shell" src="//gstatic.com/cloudssh/images/open-btn.svg" style="max-height: 44px; margin: 32px auto; max-width: 100%;">
</a>
</div>
## Example Usage - Health Check Http2 Full
```hcl
resource "google_compute_health_check" "http2-health-check" {
name = "http2-health-check"
description = "Health check via http2"
timeout_sec = 1
check_interval_sec = 1
healthy_threshold = 4
unhealthy_threshold = 5
http2_health_check {
port_name = "health-check-port"
port_specification = "USE_NAMED_PORT"
host = "1.2.3.4"
request_path = "/mypath"
proxy_header = "NONE"
response = "I AM HEALTHY"
}
}
```
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<img alt="Open in Cloud Shell" src="//gstatic.com/cloudssh/images/open-btn.svg" style="max-height: 44px; margin: 32px auto; max-width: 100%;">
</a>
</div>
## Example Usage - Health Check Grpc
```hcl
resource "google_compute_health_check" "grpc-health-check" {
name = "grpc-health-check"
timeout_sec = 1
check_interval_sec = 1
grpc_health_check {
port = "443"
}
}
```
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</a>
</div>
## Example Usage - Health Check Grpc Full
```hcl
resource "google_compute_health_check" "grpc-health-check" {
name = "grpc-health-check"
timeout_sec = 1
check_interval_sec = 1
grpc_health_check {
port_name = "health-check-port"
port_specification = "USE_NAMED_PORT"
grpc_service_name = "testservice"
}
}
```
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<img alt="Open in Cloud Shell" src="//gstatic.com/cloudssh/images/open-btn.svg" style="max-height: 44px; margin: 32px auto; max-width: 100%;">
</a>
</div>
## Example Usage - Health Check With Logging
```hcl
resource "google_compute_health_check" "health-check-with-logging" {
provider = google-beta
name = "tcp-health-check"
timeout_sec = 1
check_interval_sec = 1
tcp_health_check {
port = "22"
}
log_config {
enable = true
}
}
```
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</a>
</div>
## Example Usage - Compute Health Check Http Source Regions
```hcl
resource "google_compute_health_check" "http-health-check-with-source-regions" {
name = "http-health-check"
check_interval_sec = 30
http_health_check {
port = 80
port_specification = "USE_FIXED_PORT"
}
source_regions = ["us-west1", "us-central1", "us-east5"]
}
```
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</div>
## Example Usage - Compute Health Check Https Source Regions
```hcl
resource "google_compute_health_check" "https-health-check-with-source-regions" {
name = "https-health-check"
check_interval_sec = 30
https_health_check {
port = 80
port_specification = "USE_FIXED_PORT"
}
source_regions = ["us-west1", "us-central1", "us-east5"]
}
```
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</div>
## Example Usage - Compute Health Check Tcp Source Regions
```hcl
resource "google_compute_health_check" "tcp-health-check-with-source-regions" {
name = "tcp-health-check"
check_interval_sec = 30
tcp_health_check {
port = 80
port_specification = "USE_FIXED_PORT"
}
source_regions = ["us-west1", "us-central1", "us-east5"]
}
```
## Argument Reference
The following arguments are supported:
* `name` -
(Required)
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. Specifically, the name must be 1-63 characters long and
match the regular expression `[a-z]([-a-z0-9]*[a-z0-9])?` which means
the first character must be a lowercase letter, and all following
characters must be a dash, lowercase letter, or digit, except the
last character, which cannot be a dash.
- - -
* `check_interval_sec` -
(Optional)
How often (in seconds) to send a health check. The default value is 5
seconds.
* `description` -
(Optional)
An optional description of this resource. Provide this property when
you create the resource.
* `healthy_threshold` -
(Optional)
A so-far unhealthy instance will be marked healthy after this many
consecutive successes. The default value is 2.
* `timeout_sec` -
(Optional)
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.
* `source_regions` -
(Optional)
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.
* `unhealthy_threshold` -
(Optional)
A so-far healthy instance will be marked unhealthy after this many
consecutive failures. The default value is 2.
* `http_health_check` -
(Optional)
A nested object resource
Structure is [documented below](#nested_http_health_check).
* `https_health_check` -
(Optional)
A nested object resource
Structure is [documented below](#nested_https_health_check).
* `tcp_health_check` -
(Optional)
A nested object resource
Structure is [documented below](#nested_tcp_health_check).
* `ssl_health_check` -
(Optional)
A nested object resource
Structure is [documented below](#nested_ssl_health_check).
* `http2_health_check` -
(Optional)
A nested object resource
Structure is [documented below](#nested_http2_health_check).
* `grpc_health_check` -
(Optional)
A nested object resource
Structure is [documented below](#nested_grpc_health_check).
* `log_config` -
(Optional)
Configure logging on this health check.
Structure is [documented below](#nested_log_config).
* `project` - (Optional) The ID of the project in which the resource belongs.
If it is not provided, the provider project is used.
<a name="nested_http_health_check"></a>The `http_health_check` block supports:
* `host` -
(Optional)
The value of the host header in the HTTP health check request.
If left empty (default value), the public IP on behalf of which this health
check is performed will be used.
* `request_path` -
(Optional)
The request path of the HTTP health check request.
The default value is /.
* `response` -
(Optional)
The bytes to match against the beginning of the response data. If left empty
(the default value), any response will indicate health. The response data
can only be ASCII.
* `port` -
(Optional)
The TCP port number for the HTTP health check request.
The default value is 80.
* `port_name` -
(Optional)
Port name as defined in InstanceGroup#NamedPort#name. If both port and
port_name are defined, port takes precedence.
* `proxy_header` -
(Optional)
Specifies the type of proxy header to append before sending data to the
backend.
Default value is `NONE`.
Possible values are: `NONE`, `PROXY_V1`.
* `port_specification` -
(Optional)
Specifies how port is selected for health checking, can be one of the
following values:
* `USE_FIXED_PORT`: The port number in `port` is used for health checking.
* `USE_NAMED_PORT`: The `portName` is used for health checking.
* `USE_SERVING_PORT`: For NetworkEndpointGroup, the port specified for each
network endpoint is used for health checking. For other backends, the
port or named port specified in the Backend Service is used for health
checking.
If not specified, HTTP health check follows behavior specified in `port` and
`portName` fields.
Possible values are: `USE_FIXED_PORT`, `USE_NAMED_PORT`, `USE_SERVING_PORT`.
<a name="nested_https_health_check"></a>The `https_health_check` block supports:
* `host` -
(Optional)
The value of the host header in the HTTPS health check request.
If left empty (default value), the public IP on behalf of which this health
check is performed will be used.
* `request_path` -
(Optional)
The request path of the HTTPS health check request.
The default value is /.
* `response` -
(Optional)
The bytes to match against the beginning of the response data. If left empty
(the default value), any response will indicate health. The response data
can only be ASCII.
* `port` -
(Optional)
The TCP port number for the HTTPS health check request.
The default value is 443.
* `port_name` -
(Optional)
Port name as defined in InstanceGroup#NamedPort#name. If both port and
port_name are defined, port takes precedence.
* `proxy_header` -
(Optional)
Specifies the type of proxy header to append before sending data to the
backend.
Default value is `NONE`.
Possible values are: `NONE`, `PROXY_V1`.
* `port_specification` -
(Optional)
Specifies how port is selected for health checking, can be one of the
following values:
* `USE_FIXED_PORT`: The port number in `port` is used for health checking.
* `USE_NAMED_PORT`: The `portName` is used for health checking.
* `USE_SERVING_PORT`: For NetworkEndpointGroup, the port specified for each
network endpoint is used for health checking. For other backends, the
port or named port specified in the Backend Service is used for health
checking.
If not specified, HTTPS health check follows behavior specified in `port` and
`portName` fields.
Possible values are: `USE_FIXED_PORT`, `USE_NAMED_PORT`, `USE_SERVING_PORT`.
<a name="nested_tcp_health_check"></a>The `tcp_health_check` block supports:
* `request` -
(Optional)
The application data to send once the TCP connection has been
established (default value is empty). If both request and response are
empty, the connection establishment alone will indicate health. The request
data can only be ASCII.
* `response` -
(Optional)
The bytes to match against the beginning of the response data. If left empty
(the default value), any response will indicate health. The response data
can only be ASCII.
* `port` -
(Optional)
The TCP port number for the TCP health check request.
The default value is 443.
* `port_name` -
(Optional)
Port name as defined in InstanceGroup#NamedPort#name. If both port and
port_name are defined, port takes precedence.
* `proxy_header` -
(Optional)
Specifies the type of proxy header to append before sending data to the
backend.
Default value is `NONE`.
Possible values are: `NONE`, `PROXY_V1`.
* `port_specification` -
(Optional)
Specifies how port is selected for health checking, can be one of the
following values:
* `USE_FIXED_PORT`: The port number in `port` is used for health checking.
* `USE_NAMED_PORT`: The `portName` is used for health checking.
* `USE_SERVING_PORT`: For NetworkEndpointGroup, the port specified for each
network endpoint is used for health checking. For other backends, the
port or named port specified in the Backend Service is used for health
checking.
If not specified, TCP health check follows behavior specified in `port` and
`portName` fields.
Possible values are: `USE_FIXED_PORT`, `USE_NAMED_PORT`, `USE_SERVING_PORT`.
<a name="nested_ssl_health_check"></a>The `ssl_health_check` block supports:
* `request` -
(Optional)
The application data to send once the SSL connection has been
established (default value is empty). If both request and response are
empty, the connection establishment alone will indicate health. The request
data can only be ASCII.
* `response` -
(Optional)
The bytes to match against the beginning of the response data. If left empty
(the default value), any response will indicate health. The response data
can only be ASCII.
* `port` -
(Optional)
The TCP port number for the SSL health check request.
The default value is 443.
* `port_name` -
(Optional)
Port name as defined in InstanceGroup#NamedPort#name. If both port and
port_name are defined, port takes precedence.
* `proxy_header` -
(Optional)
Specifies the type of proxy header to append before sending data to the
backend.
Default value is `NONE`.
Possible values are: `NONE`, `PROXY_V1`.
* `port_specification` -
(Optional)
Specifies how port is selected for health checking, can be one of the
following values:
* `USE_FIXED_PORT`: The port number in `port` is used for health checking.
* `USE_NAMED_PORT`: The `portName` is used for health checking.
* `USE_SERVING_PORT`: For NetworkEndpointGroup, the port specified for each
network endpoint is used for health checking. For other backends, the
port or named port specified in the Backend Service is used for health
checking.
If not specified, SSL health check follows behavior specified in `port` and
`portName` fields.
Possible values are: `USE_FIXED_PORT`, `USE_NAMED_PORT`, `USE_SERVING_PORT`.
<a name="nested_http2_health_check"></a>The `http2_health_check` block supports:
* `host` -
(Optional)
The value of the host header in the HTTP2 health check request.
If left empty (default value), the public IP on behalf of which this health
check is performed will be used.
* `request_path` -
(Optional)
The request path of the HTTP2 health check request.
The default value is /.
* `response` -
(Optional)
The bytes to match against the beginning of the response data. If left empty
(the default value), any response will indicate health. The response data
can only be ASCII.
* `port` -
(Optional)
The TCP port number for the HTTP2 health check request.
The default value is 443.
* `port_name` -
(Optional)
Port name as defined in InstanceGroup#NamedPort#name. If both port and
port_name are defined, port takes precedence.
* `proxy_header` -
(Optional)
Specifies the type of proxy header to append before sending data to the
backend.
Default value is `NONE`.
Possible values are: `NONE`, `PROXY_V1`.
* `port_specification` -
(Optional)
Specifies how port is selected for health checking, can be one of the
following values:
* `USE_FIXED_PORT`: The port number in `port` is used for health checking.
* `USE_NAMED_PORT`: The `portName` is used for health checking.
* `USE_SERVING_PORT`: For NetworkEndpointGroup, the port specified for each
network endpoint is used for health checking. For other backends, the
port or named port specified in the Backend Service is used for health
checking.
If not specified, HTTP2 health check follows behavior specified in `port` and
`portName` fields.
Possible values are: `USE_FIXED_PORT`, `USE_NAMED_PORT`, `USE_SERVING_PORT`.
<a name="nested_grpc_health_check"></a>The `grpc_health_check` block supports:
* `port` -
(Optional)
The port number for the health check request.
Must be specified if portName and portSpecification are not set
or if port_specification is USE_FIXED_PORT. Valid values are 1 through 65535.
* `port_name` -
(Optional)
Port name as defined in InstanceGroup#NamedPort#name. If both port and
port_name are defined, port takes precedence.
* `port_specification` -
(Optional)
Specifies how port is selected for health checking, can be one of the
following values:
* `USE_FIXED_PORT`: The port number in `port` is used for health checking.
* `USE_NAMED_PORT`: The `portName` is used for health checking.
* `USE_SERVING_PORT`: For NetworkEndpointGroup, the port specified for each
network endpoint is used for health checking. For other backends, the
port or named port specified in the Backend Service is used for health
checking.
If not specified, gRPC health check follows behavior specified in `port` and
`portName` fields.
Possible values are: `USE_FIXED_PORT`, `USE_NAMED_PORT`, `USE_SERVING_PORT`.
* `grpc_service_name` -
(Optional)
The gRPC service name for the health check.
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.
<a name="nested_log_config"></a>The `log_config` block supports:
* `enable` -
(Optional)
Indicates whether or not to export logs. This is false by default,
which means no health check logging will be done.
## Attributes Reference
In addition to the arguments listed above, the following computed attributes are exported:
* `id` - an identifier for the resource with format `projects/{{project}}/global/healthChecks/{{name}}`
* `creation_timestamp` -
Creation timestamp in RFC3339 text format.
* `type` -
The type of the health check. One of HTTP, HTTPS, TCP, or SSL.
* `self_link` - The URI of the created resource.
## Timeouts
This resource provides the following
[Timeouts](https://developer.hashicorp.com/terraform/plugin/sdkv2/resources/retries-and-customizable-timeouts) configuration options:
- `create` - Default is 20 minutes.
- `update` - Default is 20 minutes.
- `delete` - Default is 20 minutes.
## Import
HealthCheck can be imported using any of these accepted formats:
* `projects/{{project}}/global/healthChecks/{{name}}`
* `{{project}}/{{name}}`
* `{{name}}`
In Terraform v1.5.0 and later, use an [`import` block](https://developer.hashicorp.com/terraform/language/import) to import HealthCheck using one of the formats above. For example:
```tf
import {
id = "projects/{{project}}/global/healthChecks/{{name}}"
to = google_compute_health_check.default
}
```
When using the [`terraform import` command](https://developer.hashicorp.com/terraform/cli/commands/import), HealthCheck can be imported using one of the formats above. For example:
```
$ terraform import google_compute_health_check.default projects/{{project}}/global/healthChecks/{{name}}
$ terraform import google_compute_health_check.default {{project}}/{{name}}
$ terraform import google_compute_health_check.default {{name}}
```
## User Project Overrides
This resource supports [User Project Overrides](https://registry.terraform.io/providers/hashicorp/google/latest/docs/guides/provider_reference#user_project_override).