- HTTP request
- Path parameters
- Query parameters
- Request body
- Response body
- JSON representation
- JSON representation
- JSON representation
- JSON representation
- JSON representation
- JSON representation
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Retrieves an aggregated list of all usable backend services in the specified project in the given region.
HTTP request
GET https://compute.googleapis.com/compute/v1/projects/{project}/regions/{region}/backendServices/listUsable
The URL uses gRPC Transcoding syntax.
Path parameters
Parameters | |
---|---|
project
|
Project ID for this request. |
region
|
Name of the region scoping this request. It must be a string that meets the requirements in RFC1035. |
Query parameters
Parameters | |
---|---|
maxResults
|
The maximum number of results per page that should be returned. If the number of available results is larger than |
pageToken
|
Specifies a page token to use. Set |
filter
|
A filter expression that filters resources listed in the response. Most Compute resources support two types of filter expressions: expressions that support regular expressions and expressions that follow API improvement proposal AIP-160 . These two types of filter expressions cannot be mixed in one request. If you want to use AIP-160, your expression must specify the field name, an operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The operator must be either For example, if you are filtering Compute Engine instances, you can exclude instances named The
You can also filter nested fields. For example, you could specify To filter on multiple expressions, provide each separate expression within parentheses. For example:
By default, each expression is an
If you want to use a regular expression, use the The literal value is interpreted as a regular expression using Google RE2 library syntax. The literal value must match the entire field. For example, to filter for instances that do not end with name "instance", you would use You cannot combine constraints on multiple fields using regular expressions. |
orderBy
|
Sorts list results by a certain order. By default, results are returned in alphanumerical order based on the resource name. You can also sort results in descending order based on the creation timestamp using Currently, only sorting by |
returnPartialSuccess
|
Opt-in for partial success behavior which provides partial results in case of failure. The default value is false. For example, when partial success behavior is enabled, aggregatedList for a single zone scope either returns all resources in the zone or no resources, with an error code. |
Request body
The request body must be empty.
Response body
Contains a list of usable BackendService resources.
If successful, the response body contains data with the following structure:
JSON representation |
---|
{ "kind" : string , "id" : string , "items" : [ { "kind" : string , "id" : string , "creationTimestamp" : string , "name" : string , "description" : string , "selfLink" : string , "backends" : [ { "description" : string , "group" : string , "balancingMode" : enum , "maxUtilization" : number , "maxRate" : integer , "maxRatePerInstance" : number , "maxRatePerEndpoint" : number , "maxConnections" : integer , "maxConnectionsPerInstance" : integer , "maxConnectionsPerEndpoint" : integer , "capacityScaler" : number , "failover" : boolean , "preference" : enum } ] , "healthChecks" : [ string ] , "timeoutSec" : integer , "port" : integer , "protocol" : enum , "fingerprint" : string , "portName" : string , "enableCDN" : boolean , "sessionAffinity" : enum , "affinityCookieTtlSec" : integer , "region" : string , "failoverPolicy" : { "disableConnectionDrainOnFailover" : boolean , "dropTrafficIfUnhealthy" : boolean , "failoverRatio" : number } , "loadBalancingScheme" : enum , "connectionDraining" : { "drainingTimeoutSec" : integer } , "iap" : { "enabled" : boolean , "oauth2ClientId" : string , "oauth2ClientSecret" : string , "oauth2ClientSecretSha256" : string } , "cdnPolicy" : { "cacheKeyPolicy" : { "includeProtocol" : boolean , "includeHost" : boolean , "includeQueryString" : boolean , "queryStringWhitelist" : [ string ] , "queryStringBlacklist" : [ string ] , "includeHttpHeaders" : [ string ] , "includeNamedCookies" : [ string ] } , "signedUrlKeyNames" : [ string ] , "signedUrlCacheMaxAgeSec" : string , "requestCoalescing" : boolean , "cacheMode" : enum , "defaultTtl" : integer , "maxTtl" : integer , "clientTtl" : integer , "negativeCaching" : boolean , "negativeCachingPolicy" : [ { "code" : integer , "ttl" : integer } ] , "bypassCacheOnRequestHeaders" : [ { "headerName" : string } ] , "serveWhileStale" : integer } , "customRequestHeaders" : [ string ] , "customResponseHeaders" : [ string ] , "securityPolicy" : string , "edgeSecurityPolicy" : string , "logConfig" : { "enable" : boolean , "sampleRate" : number , "optionalMode" : enum , "optionalFields" : [ string ] } , "securitySettings" : { "clientTlsPolicy" : string , "subjectAltNames" : [ string ] , "awsV4Authentication" : { "accessKeyId" : string , "accessKey" : string , "accessKeyVersion" : string , "originRegion" : string } } , "localityLbPolicy" : enum , "consistentHash" : { "httpCookie" : { "name" : string , "path" : string , "ttl" : { "seconds" : string , "nanos" : integer } } , "httpHeaderName" : string , "minimumRingSize" : string } , "circuitBreakers" : { "maxRequestsPerConnection" : integer , "maxConnections" : integer , "maxPendingRequests" : integer , "maxRequests" : integer , "maxRetries" : integer } , "outlierDetection" : { "consecutiveErrors" : integer , "interval" : { "seconds" : string , "nanos" : integer } , "baseEjectionTime" : { "seconds" : string , "nanos" : integer } , "maxEjectionPercent" : integer , "enforcingConsecutiveErrors" : integer , "enforcingSuccessRate" : integer , "successRateMinimumHosts" : integer , "successRateRequestVolume" : integer , "successRateStdevFactor" : integer , "consecutiveGatewayFailure" : integer , "enforcingConsecutiveGatewayFailure" : integer } , "network" : string , "subsetting" : { "policy" : enum } , "connectionTrackingPolicy" : { "trackingMode" : enum , "connectionPersistenceOnUnhealthyBackends" : enum , "idleTimeoutSec" : integer , "enableStrongAffinity" : boolean } , "maxStreamDuration" : { "seconds" : string , "nanos" : integer } , "compressionMode" : enum , "serviceLbPolicy" : string , "serviceBindings" : [ string ] , "localityLbPolicies" : [ { // Union field |
kind
string
[Output Only] Type of resource. Always compute#usableBackendServiceList
for lists of usable backend services.
id
string
[Output Only] Unique identifier for the resource; defined by the server.
items[]
object
A list of BackendService resources.
items[].kind
string
[Output Only] Type of resource. Always compute#backendService
for backend services.
items[].id
string ( uint64
format)
[Output Only] The unique identifier for the resource. This identifier is defined by the server.
items[].creationTimestamp
string
[Output Only] Creation timestamp in RFC3339 text format.
items[].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
. 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.
items[].description
string
An optional description of this resource. Provide this property when you create the resource.
items[].selfLink
string
[Output Only] Server-defined URL for the resource.
items[].backends[]
object
The list of backends that serve this BackendService.
items[].backends[].description
string
An optional description of this resource. Provide this property when you create the resource.
items[].backends[].group
string
The fully-qualified URL of an instance group or network endpoint group (NEG) resource. To determine what types of backends a load balancer supports, see the Backend services overview .
You must use the fully-qualified
URL (starting with https://www.googleapis.com/
) to specify the instance group or NEG. Partial URLs are not supported.
items[].backends[].balancingMode
enum
Specifies how to determine whether the backend of a load balancer can handle additional traffic or is fully loaded. For usage guidelines, see Connection balancing mode .
Backends must use compatible balancing modes. For more information, see Supported balancing modes and target capacity settings and Restrictions and guidance for instance groups .
Note: Currently, if you use the API to configure incompatible balancing modes, the configuration might be accepted even though it has no impact and is ignored. Specifically, Backend.maxUtilization is ignored when Backend.balancingMode is RATE. In the future, this incompatible combination will be rejected.
items[].backends[].maxUtilization
number
Optional parameter to define a target capacity for the UTILIZATION
balancing mode. The valid range is [0.0, 1.0]
.
For usage guidelines, see Utilization balancing mode .
items[].backends[].maxRate
integer
Defines a maximum number of HTTP requests per second (RPS). For usage guidelines, see Rate balancing mode and Utilization balancing mode .
Not available if the backend's balancingMode
is CONNECTION
.
items[].backends[].maxRatePerInstance
number
Defines a maximum target for requests per second (RPS). For usage guidelines, see Rate balancing mode and Utilization balancing mode .
Not available if the backend's balancingMode
is CONNECTION
.
items[].backends[].maxRatePerEndpoint
number
Defines a maximum target for requests per second (RPS). For usage guidelines, see Rate balancing mode and Utilization balancing mode .
Not available if the backend's balancingMode
is CONNECTION
.
items[].backends[].maxConnections
integer
Defines a target maximum number of simultaneous connections. For usage guidelines, see Connection balancing mode
and Utilization balancing mode
. Not available if the backend's balancingMode
is RATE
.
items[].backends[].maxConnectionsPerInstance
integer
Defines a target maximum number of simultaneous connections. For usage guidelines, see Connection balancing mode and Utilization balancing mode .
Not available if the backend's balancingMode
is RATE
.
items[].backends[].maxConnectionsPerEndpoint
integer
Defines a target maximum number of simultaneous connections. For usage guidelines, see Connection balancing mode and Utilization balancing mode .
Not available if the backend's balancingMode
is RATE
.
items[].backends[].capacityScaler
number
A multiplier applied to the backend's target capacity of its balancing mode. The default value is 1
, which means the group serves up to 100% of its configured capacity (depending on balancingMode
). A setting of 0
means the group is completely drained, offering 0% of its available capacity. The valid ranges are 0.0
and [0.1,1.0]. You cannot configure a setting larger than 0
and smaller than 0.1
. You cannot configure a setting of 0
when there is only one backend attached to the backend service.
Not available with backends that don't support using a balancingMode
. This includes backends such as global internet NEGs, regional serverless NEGs, and PSC NEGs.
items[].backends[].failover
boolean
This field designates whether this is a failover backend. More than one failover backend can be configured for a given BackendService.
items[].backends[].preference
enum
This field indicates whether this backend should be fully utilized before sending traffic to backends with default preference. The possible values are:
-
PREFERRED
: Backends with this preference level will be filled up to their capacity limits first, based on RTT. -
DEFAULT
: If preferred backends don't have enough capacity, backends in this layer would be used and traffic would be assigned based on the load balancing algorithm you use. This is the default
items[].healthChecks[]
string
The list of URLs to the healthChecks, httpHealthChecks (legacy), or httpsHealthChecks (legacy) resource for health checking this backend service. Not all backend services support legacy health checks. See Load balancer guide . Currently, at most one health check can be specified for each backend service. Backend services with instance group or zonal NEG backends must have a health check. Backend services with internet or serverless NEG backends must not have a health check.
items[].timeoutSec
integer
The backend service timeout has a different meaning depending on the type of load balancer. For more information see, Backend service settings . The default is 30 seconds. The full range of timeout values allowed goes from 1 through 2,147,483,647 seconds.
This value can be overridden in the PathMatcher configuration of the UrlMap that references this backend service.
Not supported when the backend service is referenced by a URL map that is bound to target gRPC proxy that has validateForProxyless field set to true. Instead, use maxStreamDuration
.
items[].port
(deprecated)
integer
Deprecated in favor of portName
. The TCP port to connect on the backend. The default value is 80
. For internal passthrough Network Load Balancers and external passthrough Network Load Balancers, omit port
.
items[].protocol
enum
The protocol this BackendService uses to communicate with backends.
Possible values are HTTP, HTTPS, HTTP2, TCP, SSL, UDP or GRPC. depending on the chosen load balancer or Traffic Director configuration. Refer to the documentation for the load balancers or for Traffic Director for more information.
Must be set to GRPC when the backend service is referenced by a URL map that is bound to target gRPC proxy.
items[].fingerprint
string ( bytes
format)
Fingerprint of this resource. A hash of the contents stored in this object. This field is used in optimistic locking. This field will be ignored when inserting a BackendService. An up-to-date fingerprint must be provided in order to update the BackendService
, otherwise the request will fail with error 412 conditionNotMet
.
To see the latest fingerprint, make a get()
request to retrieve a BackendService.
A base64-encoded string.
items[].portName
string
A named port on a backend instance group representing the port for communication to the backend VMs in that group. The named port must be defined on each backend instance group
. This parameter has no meaning if the backends are NEGs. For internal passthrough Network Load Balancers and external passthrough Network Load Balancers, omit portName
.
items[].enableCDN
boolean
If true
, enables Cloud CDN for the backend service of a global external Application Load Balancer.
items[].sessionAffinity
enum
Type of session affinity to use. The default is NONE
.
Only NONE
and HEADER_FIELD
are supported when the backend service is referenced by a URL map that is bound to target gRPC proxy that has validateForProxyless field set to true.
For more details, see: Session Affinity .
items[].affinityCookieTtlSec
integer
Lifetime of cookies in seconds. This setting is applicable to Application Load Balancers and Traffic Director and requires GENERATED_COOKIE or HTTP_COOKIE session affinity.
If set to 0
, the cookie is non-persistent and lasts only until the end of the browser session (or equivalent). The maximum allowed value is two weeks ( 1,209,600
).
Not supported when the backend service is referenced by a URL map that is bound to target gRPC proxy that has validateForProxyless field set to true.
items[].region
string
[Output Only] URL of the region where the regional backend service resides. This field is not applicable to global backend services. You must specify this field as part of the HTTP request URL. It is not settable as a field in the request body.
items[].failoverPolicy
object
Requires at least one backend instance group to be defined as a backup (failover) backend. For load balancers that have configurable failover: Internal passthrough Network Load Balancers and external passthrough Network Load Balancers .
items[].failoverPolicy.disableConnectionDrainOnFailover
boolean
This can be set to true
only if the protocol
is TCP
.
The default is false
.
items[].failoverPolicy.dropTrafficIfUnhealthy
boolean
If set to true
, connections to the load balancer are dropped when all primary and all backup backend VMs are unhealthy.If set to false
, connections are distributed among all primary VMs when all primary and all backup backend VMs are unhealthy. For load balancers that have configurable failover: Internal passthrough Network Load Balancers
and external passthrough Network Load Balancers
. The default is false
.
items[].failoverPolicy.failoverRatio
number
The value of the field must be in the range [0, 1]
. If the value is 0, the load balancer performs a failover when the number of healthy primary VMs equals zero. For all other values, the load balancer performs a failover when the total number of healthy primary VMs is less than this ratio. For load balancers that have configurable failover: Internal TCP/UDP Load Balancing
and external TCP/UDP Load Balancing
.
items[].loadBalancingScheme
enum
Specifies the load balancer type. A backend service created for one type of load balancer cannot be used with another. For more information, refer to Choosing a load balancer .
items[].connectionDraining
object
items[].connectionDraining.drainingTimeoutSec
integer
Configures a duration timeout for existing requests on a removed backend instance. For supported load balancers and protocols, as described in Enabling connection draining .
items[].iap
object
The configurations for Identity-Aware Proxy on this resource. Not available for internal passthrough Network Load Balancers and external passthrough Network Load Balancers.
items[].iap.enabled
boolean
Whether the serving infrastructure will authenticate and authorize all incoming requests.
items[].iap.oauth2ClientId
string
OAuth2 client ID to use for the authentication flow.
items[].iap.oauth2ClientSecret
string
OAuth2 client secret to use for the authentication flow. For security reasons, this value cannot be retrieved via the API. Instead, the SHA-256 hash of the value is returned in the oauth2ClientSecretSha256 field.
@InputOnly
items[].iap.oauth2ClientSecretSha256
string
[Output Only] SHA256 hash value for the field oauth2ClientSecret above.
items[].cdnPolicy
object
Cloud CDN configuration for this BackendService. Only available for specified load balancer types .
items[].cdnPolicy.cacheKeyPolicy
object
The CacheKeyPolicy for this CdnPolicy.
items[].cdnPolicy.cacheKeyPolicy.includeProtocol
boolean
If true, http and https requests will be cached separately.
items[].cdnPolicy.cacheKeyPolicy.includeHost
boolean
If true, requests to different hosts will be cached separately.
items[].cdnPolicy.cacheKeyPolicy.includeQueryString
boolean
If true, include query string parameters in the cache key according to queryStringWhitelist and queryStringBlacklist. If neither is set, the entire query string will be included. If false, the query string will be excluded from the cache key entirely.
items[].cdnPolicy.cacheKeyPolicy.queryStringWhitelist[]
string
Names of query string parameters to include in cache keys. All other parameters will be excluded. Either specify queryStringWhitelist or queryStringBlacklist, not both. '&' and '=' will be percent encoded and not treated as delimiters.
items[].cdnPolicy.cacheKeyPolicy.queryStringBlacklist[]
string
Names of query string parameters to exclude in cache keys. All other parameters will be included. Either specify queryStringWhitelist or queryStringBlacklist, not both. '&' and '=' will be percent encoded and not treated as delimiters.
items[].cdnPolicy.cacheKeyPolicy.includeHttpHeaders[]
string
Allows HTTP request headers (by name) to be used in the cache key.
items[].cdnPolicy.cacheKeyPolicy.includeNamedCookies[]
string
Allows HTTP cookies (by name) to be used in the cache key. The name=value pair will be used in the cache key Cloud CDN generates.
items[].cdnPolicy.signedUrlKeyNames[]
string
[Output Only] Names of the keys for signing request URLs.
items[].cdnPolicy.signedUrlCacheMaxAgeSec
string ( int64
format)
Maximum number of seconds the response to a signed URL request will be considered fresh. After this time period, the response will be revalidated before being served. Defaults to 1hr (3600s). When serving responses to signed URL requests, Cloud CDN will internally behave as though all responses from this backend had a "Cache-Control: public, max-age=[TTL]"
header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
items[].cdnPolicy.requestCoalescing
boolean
If true then Cloud CDN will combine multiple concurrent cache fill requests into a small number of requests to the origin.
items[].cdnPolicy.cacheMode
enum
Specifies the cache setting for all responses from this backend. The possible values are: USE_ORIGIN_HEADERS
Requires the origin to set valid caching headers to cache content. Responses without these headers will not be cached at Google's edge, and will require a full trip to the origin on every request, potentially impacting performance and increasing load on the origin server. FORCE_CACHE_ALL
Cache all content, ignoring any "private", "no-store" or "no-cache" directives in Cache-Control response headers. Warning: this may result in Cloud CDN caching private, per-user (user identifiable) content. CACHE_ALL_STATIC
Automatically cache static content, including common image formats, media (video and audio), and web assets (JavaScript and CSS). Requests and responses that are marked as uncacheable, as well as dynamic content (including HTML), will not be cached.
items[].cdnPolicy.defaultTtl
integer
Specifies the default TTL for cached content served by this origin for responses that do not have an existing valid TTL (max-age or s-max-age). Setting a TTL of "0" means "always revalidate". The value of defaultTTL cannot be set to a value greater than that of maxTTL, but can be equal. When the cacheMode is set to FORCE_CACHE_ALL
, the defaultTTL will overwrite the TTL set in all responses. The maximum allowed value is 31,622,400s (1 year), noting that infrequently accessed objects may be evicted from the cache before the defined TTL.
items[].cdnPolicy.maxTtl
integer
Specifies the maximum allowed TTL for cached content served by this origin. Cache directives that attempt to set a max-age or s-maxage higher than this, or an Expires header more than maxTTL seconds in the future will be capped at the value of maxTTL, as if it were the value of an s-maxage Cache-Control directive. Headers sent to the client will not be modified. Setting a TTL of "0" means "always revalidate". The maximum allowed value is 31,622,400s (1 year), noting that infrequently accessed objects may be evicted from the cache before the defined TTL.
items[].cdnPolicy.clientTtl
integer
Specifies a separate client (e.g. browser client) maximum TTL. This is used to clamp the max-age (or Expires) value sent to the client. With FORCE_CACHE_ALL, the lesser of clientTtl and defaultTtl is used for the response max-age directive, along with a "public" directive. For cacheable content in CACHE_ALL_STATIC mode, clientTtl clamps the max-age from the origin (if specified), or else sets the response max-age directive to the lesser of the clientTtl and defaultTtl, and also ensures a "public" cache-control directive is present. If a client TTL is not specified, a default value (1 hour) will be used. The maximum allowed value is 31,622,400s (1 year).
items[].cdnPolicy.negativeCaching
boolean
Negative caching allows per-status code TTLs to be set, in order to apply fine-grained caching for common errors or redirects. This can reduce the load on your origin and improve end-user experience by reducing response latency. When the cache mode is set to CACHE_ALL_STATIC or USE_ORIGIN_HEADERS, negative caching applies to responses with the specified response code that lack any Cache-Control, Expires, or Pragma: no-cache directives. When the cache mode is set to FORCE_CACHE_ALL, negative caching applies to all responses with the specified response code, and override any caching headers. By default, Cloud CDN will apply the following default TTLs to these status codes: HTTP 300 (Multiple Choice), 301, 308 (Permanent Redirects): 10m HTTP 404 (Not Found), 410 (Gone), 451 (Unavailable For Legal Reasons): 120s HTTP 405 (Method Not Found), 421 (Misdirected Request), 501 (Not Implemented): 60s. These defaults can be overridden in negativeCachingPolicy.
items[].cdnPolicy.negativeCachingPolicy[]
object
Sets a cache TTL for the specified HTTP status code. negativeCaching must be enabled to configure negativeCachingPolicy. Omitting the policy and leaving negativeCaching enabled will use Cloud CDN's default cache TTLs. Note that when specifying an explicit negativeCachingPolicy, you should take care to specify a cache TTL for all response codes that you wish to cache. Cloud CDN will not apply any default negative caching when a policy exists.
items[].cdnPolicy.negativeCachingPolicy[].code
integer
The HTTP status code to define a TTL against. Only HTTP status codes 300, 301, 302, 307, 308, 404, 405, 410, 421, 451 and 501 are can be specified as values, and you cannot specify a status code more than once.
items[].cdnPolicy.negativeCachingPolicy[].ttl
integer
The TTL (in seconds) for which to cache responses with the corresponding status code. The maximum allowed value is 1800s (30 minutes), noting that infrequently accessed objects may be evicted from the cache before the defined TTL.
items[].cdnPolicy.bypassCacheOnRequestHeaders[]
object
Bypass the cache when the specified request headers are matched - e.g. Pragma or Authorization headers. Up to 5 headers can be specified. The cache is bypassed for all cdnPolicy.cacheMode settings.
items[].cdnPolicy.bypassCacheOnRequestHeaders[].headerName
string
The header field name to match on when bypassing cache. Values are case-insensitive.
items[].cdnPolicy.serveWhileStale
integer
Serve existing content from the cache (if available) when revalidating content with the origin, or when an error is encountered when refreshing the cache. This setting defines the default "max-stale" duration for any cached responses that do not specify a max-stale directive. Stale responses that exceed the TTL configured here will not be served. The default limit (max-stale) is 86400s (1 day), which will allow stale content to be served up to this limit beyond the max-age (or s-max-age) of a cached response. The maximum allowed value is 604800 (1 week). Set this to zero (0) to disable serve-while-stale.
items[].customRequestHeaders[]
string
Headers that the load balancer adds to proxied requests. See Creating custom headers .
items[].customResponseHeaders[]
string
Headers that the load balancer adds to proxied responses. See Creating custom headers .
items[].securityPolicy
string
[Output Only] The resource URL for the security policy associated with this backend service.
items[].edgeSecurityPolicy
string
[Output Only] The resource URL for the edge security policy associated with this backend service.
items[].logConfig
object
This field denotes the logging options for the load balancer traffic served by this backend service. If logging is enabled, logs will be exported to Stackdriver.
items[].logConfig.enable
boolean
Denotes whether to enable logging for the load balancer traffic served by this backend service. The default value is false.
items[].logConfig.sampleRate
number
This field can only be specified if logging is enabled for this backend service. The value of the field must be in [0, 1]. This configures the sampling rate of requests to the load balancer where 1.0 means all logged requests are reported and 0.0 means no logged requests are reported. The default value is 1.0.
items[].logConfig.optionalMode
enum
This field can only be specified if logging is enabled for this backend service. Configures whether all, none or a subset of optional fields should be added to the reported logs. One of [INCLUDE_ALL_OPTIONAL, EXCLUDE_ALL_OPTIONAL, CUSTOM]. Default is EXCLUDE_ALL_OPTIONAL.
items[].logConfig.optionalFields[]
string
This field can only be specified if logging is enabled for this backend service and "logConfig.optionalMode" was set to CUSTOM. Contains a list of optional fields you want to include in the logs. For example: serverInstance, serverGkeDetails.cluster, serverGkeDetails.pod.podNamespace
items[].securitySettings
object
This field specifies the security settings that apply to this backend service. This field is applicable to a global backend service with the loadBalancingScheme set to INTERNAL_SELF_MANAGED.
items[].securitySettings.clientTlsPolicy
string
Optional. A URL referring to a networksecurity.ClientTlsPolicy resource that describes how clients should authenticate with this service's backends.
clientTlsPolicy
only applies to a global BackendService
with the loadBalancingScheme
set to INTERNAL_SELF_MANAGED
.
If left blank, communications are not encrypted.
items[].securitySettings.subjectAltNames[]
string
Optional. A list of Subject Alternative Names (SANs) that the client verifies during a mutual TLS handshake with an server/endpoint for this BackendService
. When the server presents its X.509 certificate to the client, the client inspects the certificate's subjectAltName
field. If the field contains one of the specified values, the communication continues. Otherwise, it fails. This additional check enables the client to verify that the server is authorized to run the requested service.
Note that the contents of the server certificate's subjectAltName
field are configured by the Public Key Infrastructure which provisions server identities.
Only applies to a global BackendService
with loadBalancingScheme
set to INTERNAL_SELF_MANAGED
. Only applies when BackendService
has an attached clientTlsPolicy
with clientCertificate
(mTLS mode).
items[].securitySettings.awsV4Authentication
object
The configuration needed to generate a signature for access to private storage buckets that support AWS's Signature Version 4 for authentication. Allowed only for INTERNET_IP_PORT and INTERNET_FQDN_PORT NEG backends.
items[].securitySettings.awsV4Authentication.accessKeyId
string
The identifier of an access key used for s3 bucket authentication.
items[].securitySettings.awsV4Authentication.accessKey
string
The access key used for s3 bucket authentication. Required for updating or creating a backend that uses AWS v4 signature authentication, but will not be returned as part of the configuration when queried with a REST API GET request.
@InputOnly
items[].securitySettings.awsV4Authentication.accessKeyVersion
string
The optional version identifier for the access key. You can use this to keep track of different iterations of your access key.
items[].securitySettings.awsV4Authentication.originRegion
string
The name of the cloud region of your origin. This is a free-form field with the name of the region your cloud uses to host your origin. For example, "us-east-1" for AWS or "us-ashburn-1" for OCI.
items[].localityLbPolicy
enum
The load balancing algorithm used within the scope of the locality. The possible values are:
-
ROUND_ROBIN
: This is a simple policy in which each healthy backend is selected in round robin order. This is the default. -
LEAST_REQUEST
: AnO(1)
algorithm which selects two random healthy hosts and picks the host which has fewer active requests. -
RING_HASH
: The ring/modulo hash load balancer implements consistent hashing to backends. The algorithm has the property that the addition/removal of a host from a set of N hosts only affects 1/N of the requests. -
RANDOM
: The load balancer selects a random healthy host. -
ORIGINAL_DESTINATION
: Backend host is selected based on the client connection metadata, i.e., connections are opened to the same address as the destination address of the incoming connection before the connection was redirected to the load balancer. -
MAGLEV
: used as a drop in replacement for the ring hash load balancer. Maglev is not as stable as ring hash but has faster table lookup build times and host selection times. For more information about Maglev, see https://ai.google/research/pubs/pub44824 - A regional backend service with the serviceProtocol set to HTTP, HTTPS, or HTTP2, and loadBalancingScheme set to INTERNAL_MANAGED.
- A global backend service with the loadBalancingScheme set to INTERNAL_SELF_MANAGED, INTERNAL_MANAGED, or EXTERNAL_MANAGED.
This field is applicable to either:
If sessionAffinity
is not configured—that is, if session affinity remains at the default value of NONE
—then the default value for localityLbPolicy
is ROUND_ROBIN
. If session affinity is set to a value other than NONE
, then the default value for localityLbPolicy
is MAGLEV
.
Only ROUND_ROBIN
and RING_HASH
are supported when the backend service is referenced by a URL map that is bound to target gRPC proxy that has validateForProxyless field set to true.
items[].consistentHash
object
Consistent Hash-based load balancing can be used to provide soft session affinity based on HTTP headers, cookies or other properties. This load balancing policy is applicable only for HTTP connections. The affinity to a particular destination host will be lost when one or more hosts are added/removed from the destination service. This field specifies parameters that control consistent hashing. This field is only applicable when localityLbPolicy
is set to MAGLEV
or RING_HASH
.
This field is applicable to either:
- A regional backend service with the serviceProtocol set to HTTP, HTTPS, or HTTP2, and loadBalancingScheme set to INTERNAL_MANAGED.
- A global backend service with the loadBalancingScheme set to INTERNAL_SELF_MANAGED.
items[].consistentHash.httpCookie
object
Hash is based on HTTP Cookie. This field describes a HTTP cookie that will be used as the hash key for the consistent hash load balancer. If the cookie is not present, it will be generated. This field is applicable if the sessionAffinity
is set to HTTP_COOKIE
.
Not supported when the backend service is referenced by a URL map that is bound to target gRPC proxy that has validateForProxyless field set to true.
items[].consistentHash.httpCookie.name
string
Name of the cookie.
items[].consistentHash.httpCookie.path
string
Path to set for the cookie.
items[].consistentHash.httpCookie.ttl
object
Lifetime of the cookie.
items[].consistentHash.httpCookie.ttl.seconds
string ( int64
format)
Span of time at a resolution of a second. Must be from 0 to 315,576,000,000 inclusive. Note: these bounds are computed from: 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
items[].consistentHash.httpCookie.ttl.nanos
integer
Span of time that's a fraction of a second at nanosecond resolution. Durations less than one second are represented with a 0 seconds
field and a positive nanos
field. Must be from 0 to 999,999,999 inclusive.
items[].consistentHash.httpHeaderName
string
The hash based on the value of the specified header field. This field is applicable if the sessionAffinity
is set to HEADER_FIELD
.
items[].consistentHash.minimumRingSize
string ( int64
format)
The minimum number of virtual nodes to use for the hash ring. Defaults to 1024. Larger ring sizes result in more granular load distributions. If the number of hosts in the load balancing pool is larger than the ring size, each host will be assigned a single virtual node.
items[].circuitBreakers
object
items[].circuitBreakers.maxRequestsPerConnection
integer
Maximum requests for a single connection to the backend service. This parameter is respected by both the HTTP/1.1 and HTTP/2 implementations. If not specified, there is no limit. Setting this parameter to 1 will effectively disable keep alive.
Not supported when the backend service is referenced by a URL map that is bound to target gRPC proxy that has validateForProxyless field set to true.
items[].circuitBreakers.maxConnections
integer
The maximum number of connections to the backend service. If not specified, there is no limit.
Not supported when the backend service is referenced by a URL map that is bound to target gRPC proxy that has validateForProxyless field set to true.
items[].circuitBreakers.maxPendingRequests
integer
The maximum number of pending requests allowed to the backend service. If not specified, there is no limit.
Not supported when the backend service is referenced by a URL map that is bound to target gRPC proxy that has validateForProxyless field set to true.
items[].circuitBreakers.maxRequests
integer
The maximum number of parallel requests that allowed to the backend service. If not specified, there is no limit.
items[].circuitBreakers.maxRetries
integer
The maximum number of parallel retries allowed to the backend cluster. If not specified, the default is 1.
Not supported when the backend service is referenced by a URL map that is bound to target gRPC proxy that has validateForProxyless field set to true.
items[].outlierDetection
object
Settings controlling the ejection of unhealthy backend endpoints from the load balancing pool of each individual proxy instance that processes the traffic for the given backend service. If not set, this feature is considered disabled.
Results of the outlier detection algorithm (ejection of endpoints from the load balancing pool and returning them back to the pool) are executed independently by each proxy instance of the load balancer. In most cases, more than one proxy instance handles the traffic received by a backend service. Thus, it is possible that an unhealthy endpoint is detected and ejected by only some of the proxies, and while this happens, other proxies may continue to send requests to the same unhealthy endpoint until they detect and eject the unhealthy endpoint.
Applicable backend endpoints can be:
- VM instances in an Instance Group
- Endpoints in a Zonal NEG (GCE_VM_IP, GCE_VM_IP_PORT)
- Endpoints in a Hybrid Connectivity NEG (NON_GCP_PRIVATE_IP_PORT)
- Serverless NEGs, that resolve to Cloud Run, App Engine, or Cloud Functions Services
- Private Service Connect NEGs, that resolve to Google-managed regional API endpoints or managed services published using Private Service Connect
Applicable backend service types can be:
- A global backend service with the loadBalancingScheme set to INTERNAL_SELF_MANAGED or EXTERNAL_MANAGED.
- A regional backend service with the serviceProtocol set to HTTP, HTTPS, or HTTP2, and loadBalancingScheme set to INTERNAL_MANAGED or EXTERNAL_MANAGED. Not supported for Serverless NEGs.
Not supported when the backend service is referenced by a URL map that is bound to target gRPC proxy that has validateForProxyless field set to true.
items[].outlierDetection.consecutiveErrors
integer
Number of consecutive errors before a backend endpoint is ejected from the load balancing pool. When the backend endpoint is accessed over HTTP, a 5xx return code qualifies as an error. Defaults to 5.
items[].outlierDetection.interval
object
Time interval between ejection analysis sweeps. This can result in both new ejections and backend endpoints being returned to service. The interval is equal to the number of seconds as defined in outlierDetection.interval.seconds plus the number of nanoseconds as defined in outlierDetection.interval.nanos. Defaults to 1 second.
items[].outlierDetection.interval.seconds
string ( int64
format)
Span of time at a resolution of a second. Must be from 0 to 315,576,000,000 inclusive. Note: these bounds are computed from: 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
items[].outlierDetection.interval.nanos
integer
Span of time that's a fraction of a second at nanosecond resolution. Durations less than one second are represented with a 0 seconds
field and a positive nanos
field. Must be from 0 to 999,999,999 inclusive.
items[].outlierDetection.baseEjectionTime
object
The base time that a backend endpoint is ejected for. Defaults to 30000ms or 30s.
After a backend endpoint is returned back to the load balancing pool, it can be ejected again in another ejection analysis. Thus, the total ejection time is equal to the base ejection time multiplied by the number of times the backend endpoint has been ejected. Defaults to 30000ms or 30s.
items[].outlierDetection.baseEjectionTime.seconds
string ( int64
format)
Span of time at a resolution of a second. Must be from 0 to 315,576,000,000 inclusive. Note: these bounds are computed from: 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
items[].outlierDetection.baseEjectionTime.nanos
integer
Span of time that's a fraction of a second at nanosecond resolution. Durations less than one second are represented with a 0 seconds
field and a positive nanos
field. Must be from 0 to 999,999,999 inclusive.
items[].outlierDetection.maxEjectionPercent
integer
Maximum percentage of backend endpoints in the load balancing pool for the backend service that can be ejected if the ejection conditions are met. Defaults to 50%.
items[].outlierDetection.enforcingConsecutiveErrors
integer
The percentage chance that a backend endpoint will be ejected when an outlier status is detected through consecutive 5xx. This setting can be used to disable ejection or to ramp it up slowly. Defaults to 0.
items[].outlierDetection.enforcingSuccessRate
integer
The percentage chance that a backend endpoint will be ejected when an outlier status is detected through success rate statistics. This setting can be used to disable ejection or to ramp it up slowly. Defaults to 100.
Not supported when the backend service uses Serverless NEG.
items[].outlierDetection.successRateMinimumHosts
integer
The number of backend endpoints in the load balancing pool that must have enough request volume to detect success rate outliers. If the number of backend endpoints is fewer than this setting, outlier detection via success rate statistics is not performed for any backend endpoint in the load balancing pool. Defaults to 5.
Not supported when the backend service uses Serverless NEG.
items[].outlierDetection.successRateRequestVolume
integer
The minimum number of total requests that must be collected in one interval (as defined by the interval duration above) to include this backend endpoint in success rate based outlier detection. If the volume is lower than this setting, outlier detection via success rate statistics is not performed for that backend endpoint. Defaults to 100.
Not supported when the backend service uses Serverless NEG.
items[].outlierDetection.successRateStdevFactor
integer
This factor is used to determine the ejection threshold for success rate outlier ejection. The ejection threshold is the difference between the mean success rate, and the product of this factor and the standard deviation of the mean success rate: mean - (stdev * successRateStdevFactor). This factor is divided by a thousand to get a double. That is, if the desired factor is 1.9, the runtime value should be 1900. Defaults to 1900.
Not supported when the backend service uses Serverless NEG.
items[].outlierDetection.consecutiveGatewayFailure
integer
The number of consecutive gateway failures (502, 503, 504 status or connection errors that are mapped to one of those status codes) before a consecutive gateway failure ejection occurs. Defaults to 3.
items[].outlierDetection.enforcingConsecutiveGatewayFailure
integer
The percentage chance that a backend endpoint will be ejected when an outlier status is detected through consecutive gateway failures. This setting can be used to disable ejection or to ramp it up slowly. Defaults to 100.
items[].network
string
The URL of the network to which this backend service belongs. This field can only be specified when the load balancing scheme is set to INTERNAL
.
items[].subsetting
object
items[].subsetting.policy
enum
items[].connectionTrackingPolicy
object
Connection Tracking configuration for this BackendService. Connection tracking policy settings are only available for external passthrough Network Load Balancers and internal passthrough Network Load Balancers.
items[].connectionTrackingPolicy.trackingMode
enum
Specifies the key used for connection tracking. There are two options:
-
PER_CONNECTION
: This is the default mode. The Connection Tracking is performed as per the Connection Key (default Hash Method) for the specific protocol. -
PER_SESSION
: The Connection Tracking is performed as per the configured Session Affinity. It matches the configured Session Affinity.
For more details, see Tracking Mode for Network Load Balancing and Tracking Mode for Internal TCP/UDP Load Balancing .
items[].connectionTrackingPolicy.connectionPersistenceOnUnhealthyBackends
enum
Specifies connection persistence when backends are unhealthy. The default value is DEFAULT_FOR_PROTOCOL
.
If set to DEFAULT_FOR_PROTOCOL
, the existing connections persist on unhealthy backends only for connection-oriented protocols ( TCP
and SCTP
) and only if the Tracking Mode is PER_CONNECTION
(default tracking mode) or the Session Affinity is configured for 5-tuple. They do not persist for UDP
.
If set to NEVER_PERSIST
, after a backend becomes unhealthy, the existing connections on the unhealthy backend are never persisted on the unhealthy backend. They are always diverted to newly selected healthy backends (unless all backends are unhealthy).
If set to ALWAYS_PERSIST
, existing connections always persist on unhealthy backends regardless of protocol and session affinity. It is generally not recommended to use this mode overriding the default.
For more details, see Connection Persistence for Network Load Balancing and Connection Persistence for Internal TCP/UDP Load Balancing .
items[].connectionTrackingPolicy.idleTimeoutSec
integer
Specifies how long to keep a Connection Tracking entry while there is no matching traffic (in seconds).
For internal passthrough Network Load Balancers:
- The minimum (default) is 10 minutes and the maximum is 16 hours.
- It can be set only if Connection Tracking is less than 5-tuple (i.e. Session Affinity is
CLIENT_IP_NO_DESTINATION
,CLIENT_IP
orCLIENT_IP_PROTO
, and Tracking Mode isPER_SESSION
).
For external passthrough Network Load Balancers the default is 60 seconds. This option is not available publicly.
items[].connectionTrackingPolicy.enableStrongAffinity
boolean
Enable Strong Session Affinity for external passthrough Network Load Balancers. This option is not available publicly.
items[].maxStreamDuration
object
Specifies the default maximum duration (timeout) for streams to this service. Duration is computed from the beginning of the stream until the response has been completely processed, including all retries. A stream that does not complete in this duration is closed.
If not specified, there will be no timeout limit, i.e. the maximum duration is infinite.
This value can be overridden in the PathMatcher configuration of the UrlMap that references this backend service.
This field is only allowed when the loadBalancingScheme
of the backend service is INTERNAL_SELF_MANAGED
.
items[].maxStreamDuration.seconds
string ( int64
format)
Span of time at a resolution of a second. Must be from 0 to 315,576,000,000 inclusive. Note: these bounds are computed from: 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
items[].maxStreamDuration.nanos
integer
Span of time that's a fraction of a second at nanosecond resolution. Durations less than one second are represented with a 0 seconds
field and a positive nanos
field. Must be from 0 to 999,999,999 inclusive.
items[].compressionMode
enum
Compress text responses using Brotli or gzip compression, based on the client's Accept-Encoding header.
items[].serviceLbPolicy
string
URL to networkservices.ServiceLbPolicy
resource.
Can only be set if load balancing scheme is EXTERNAL, EXTERNAL_MANAGED, INTERNAL_MANAGED or INTERNAL_SELF_MANAGED and the scope is global.
items[].serviceBindings[]
string
URLs of networkservices.ServiceBinding
resources.
Can only be set if load balancing scheme is INTERNAL_SELF_MANAGED. If set, lists of backends and health checks must be both empty.
items[].localityLbPolicies[]
object
A list of locality load-balancing policies to be used in order of preference. When you use localityLbPolicies, you must set at least one value for either the localityLbPolicies[].policy or the localityLbPolicies[].customPolicy field. localityLbPolicies overrides any value set in the localityLbPolicy field.
For an example of how to use this field, see Define a list of preferred policies .
Caution: This field and its children are intended for use in a service mesh that includes gRPC clients only. Envoy proxies can't use backend services that have this configuration.
items[].localityLbPolicies[].policy
object
items[].localityLbPolicies[].policy.name
enum
The name of a locality load-balancing policy. Valid values include ROUND_ROBIN and, for Java clients, LEAST_REQUEST. For information about these values, see the description of localityLbPolicy.
Do not specify the same policy more than once for a backend. If you do, the configuration is rejected.
items[].localityLbPolicies[].customPolicy
object
items[].localityLbPolicies[].customPolicy.name
string
Identifies the custom policy.
The value should match the name of a custom implementation registered on the gRPC clients. It should follow protocol buffer message naming conventions and include the full path (for example, myorg.CustomLbPolicy). The maximum length is 256 characters.
Do not specify the same custom policy more than once for a backend. If you do, the configuration is rejected.
For an example of how to use this field, see Use a custom policy .
items[].localityLbPolicies[].customPolicy.data
string
An optional, arbitrary JSON object with configuration data, understood by a locally installed custom policy implementation.
items[].metadatas
map (key: string, value: string)
Deployment metadata associated with the resource to be set by a GKE hub controller and read by the backend RCTH
items[].usedBy[]
object
[Output Only] regionBackendServices.list of resources referencing given backend service.
items[].usedBy[].reference
string
[Output Only] Server-defined URL for resources referencing given BackendService like UrlMaps, TargetTcpProxies, TargetSslProxies and ForwardingRule.
nextPageToken
string
[Output Only] This token allows you to get the next page of results for list requests. If the number of results is larger than maxResults
, use the nextPageToken
as a value for the query parameter pageToken
in the next list request. Subsequent list requests will have their own nextPageToken
to continue paging through the results.
selfLink
string
[Output Only] Server-defined URL for this resource.
warning
object
[Output Only] Informational warning message.
warning.code
enum
[Output Only] A warning code, if applicable. For example, Compute Engine returns NO_RESULTS_ON_PAGE
if there are no results in the response.
warning.message
string
[Output Only] A human-readable description of the warning code.
warning.data[]
object
[Output Only] Metadata about this warning in key: value
format. For example:
"data": [ { "key": "scope", "value": "zones/us-east1-d" }
warning.data[].key
string
[Output Only] A key that provides more detail on the warning being returned. For example, for warnings where there are no results in a list request for a particular zone, this key might be scope
and the key value might be the zone name. Other examples might be a key indicating a deprecated resource and a suggested replacement, or a warning about invalid network settings (for example, if an instance attempts to perform IP forwarding but is not enabled for IP forwarding).
warning.data[].value
string
[Output Only] A warning data value corresponding to the key.
Authorization scopes
Requires one of the following OAuth scopes:
-
https://www.googleapis.com/auth/compute.readonly
-
https://www.googleapis.com/auth/compute
-
https://www.googleapis.com/auth/cloud-platform
For more information, see the Authentication Overview .