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Application Load Balancer

Application Load Balancer API, REST: BackendGroup.addBackend

Adds backends to the specified backend group.

HTTP request

POST https://alb.api.il.nebius.cloud/apploadbalancer/v1/backendGroups/{backendGroupId}:addBackend

Path parameters

Parameter Description
backendGroupId

Required. ID of the backend group to add a backend to.

To get the backend group ID, make a list request.

Body parameters

{

  //  includes only one of the fields `http`, `grpc`, `stream`
  "http": {
    "name": "string",
    "backendWeight": "integer",
    "loadBalancingConfig": {
      "panicThreshold": "string",
      "localityAwareRoutingPercent": "string",
      "strictLocality": true,
      "mode": "string"
    },
    "port": "string",
    "healthchecks": [
      {
        "timeout": "string",
        "interval": "string",
        "intervalJitterPercent": "number",
        "healthyThreshold": "string",
        "unhealthyThreshold": "string",
        "healthcheckPort": "string",

        // `http.healthchecks[]` includes only one of the fields `plaintext`, `tls`
        "stream": {
          "send": {
            "text": "string"
          },
          "receive": {
            "text": "string"
          }
        },
        "http": {
          "host": "string",
          "path": "string",
          "useHttp2": true
        },
        "grpc": {
          "serviceName": "string"
        },
        // end of the list of possible fields`http.healthchecks[]`

        "plaintext": {},
        "tls": {
          "sni": "string",
          "validationContext": {

            // `http.healthchecks[].tls.validationContext` includes only one of the fields `trustedCaId`, `trustedCaBytes`
            "trustedCaId": "string",
            "trustedCaBytes": "string",
            // end of the list of possible fields`http.healthchecks[].tls.validationContext`

          }
        }
      }
    ],
    "tls": {
      "sni": "string",
      "validationContext": {

        // `http.tls.validationContext` includes only one of the fields `trustedCaId`, `trustedCaBytes`
        "trustedCaId": "string",
        "trustedCaBytes": "string",
        // end of the list of possible fields`http.tls.validationContext`

      }
    },
    "useHttp2": true,

    // `http` includes only one of the fields `targetGroups`, `storageBucket`
    "targetGroups": {
      "targetGroupIds": [
        "string"
      ]
    },
    "storageBucket": {
      "bucket": "string"
    },
    // end of the list of possible fields`http`

  },
  "grpc": {
    "name": "string",
    "backendWeight": "integer",
    "loadBalancingConfig": {
      "panicThreshold": "string",
      "localityAwareRoutingPercent": "string",
      "strictLocality": true,
      "mode": "string"
    },
    "port": "string",
    "healthchecks": [
      {
        "timeout": "string",
        "interval": "string",
        "intervalJitterPercent": "number",
        "healthyThreshold": "string",
        "unhealthyThreshold": "string",
        "healthcheckPort": "string",

        // `grpc.healthchecks[]` includes only one of the fields `plaintext`, `tls`
        "stream": {
          "send": {
            "text": "string"
          },
          "receive": {
            "text": "string"
          }
        },
        "http": {
          "host": "string",
          "path": "string",
          "useHttp2": true
        },
        "grpc": {
          "serviceName": "string"
        },
        // end of the list of possible fields`grpc.healthchecks[]`

        "plaintext": {},
        "tls": {
          "sni": "string",
          "validationContext": {

            // `grpc.healthchecks[].tls.validationContext` includes only one of the fields `trustedCaId`, `trustedCaBytes`
            "trustedCaId": "string",
            "trustedCaBytes": "string",
            // end of the list of possible fields`grpc.healthchecks[].tls.validationContext`

          }
        }
      }
    ],
    "tls": {
      "sni": "string",
      "validationContext": {

        // `grpc.tls.validationContext` includes only one of the fields `trustedCaId`, `trustedCaBytes`
        "trustedCaId": "string",
        "trustedCaBytes": "string",
        // end of the list of possible fields`grpc.tls.validationContext`

      }
    },
    "targetGroups": {
      "targetGroupIds": [
        "string"
      ]
    }
  },
  "stream": {
    "name": "string",
    "backendWeight": "integer",
    "loadBalancingConfig": {
      "panicThreshold": "string",
      "localityAwareRoutingPercent": "string",
      "strictLocality": true,
      "mode": "string"
    },
    "port": "string",
    "healthchecks": [
      {
        "timeout": "string",
        "interval": "string",
        "intervalJitterPercent": "number",
        "healthyThreshold": "string",
        "unhealthyThreshold": "string",
        "healthcheckPort": "string",

        // `stream.healthchecks[]` includes only one of the fields `plaintext`, `tls`
        "stream": {
          "send": {
            "text": "string"
          },
          "receive": {
            "text": "string"
          }
        },
        "http": {
          "host": "string",
          "path": "string",
          "useHttp2": true
        },
        "grpc": {
          "serviceName": "string"
        },
        // end of the list of possible fields`stream.healthchecks[]`

        "plaintext": {},
        "tls": {
          "sni": "string",
          "validationContext": {

            // `stream.healthchecks[].tls.validationContext` includes only one of the fields `trustedCaId`, `trustedCaBytes`
            "trustedCaId": "string",
            "trustedCaBytes": "string",
            // end of the list of possible fields`stream.healthchecks[].tls.validationContext`

          }
        }
      }
    ],
    "tls": {
      "sni": "string",
      "validationContext": {

        // `stream.tls.validationContext` includes only one of the fields `trustedCaId`, `trustedCaBytes`
        "trustedCaId": "string",
        "trustedCaBytes": "string",
        // end of the list of possible fields`stream.tls.validationContext`

      }
    },
    "enableProxyProtocol": true,
    "targetGroups": {
      "targetGroupIds": [
        "string"
      ]
    }
  },
  // end of the list of possible fields

}
Field Description
http object
HTTP backend to add to the backend group.
includes only one of the fields http, grpc, stream
http.
name		 string

Required. Name of the backend.

Value must match the regular expression [a-z][-a-z0-9]{1,61}[a-z0-9].
http.
backendWeight		 integer (int64)

Backend weight. Traffic is distributed between backends of a backend group according to their weights.

Weights must be set either for all backends in a group or for none of them. Setting no weights is the same as setting equal non-zero weights for all backends.

If the weight is non-positive, traffic is not sent to the backend.
http.
loadBalancingConfig		 object
Load balancing configuration for the backend.
http.
loadBalancingConfig.
panicThreshold		 string (int64)

Threshold for panic mode.

If percentage of healthy backends in the group drops below threshold, panic mode will be activated and traffic will be routed to all backends, regardless of their health check status. This helps to avoid overloading healthy backends. For details about panic mode, see documentation.

If the value is 0, panic mode will never be activated and traffic is routed only to healthy backends at all times.

Default value: 0.

Acceptable values are 0 to 100, inclusive.
http.
loadBalancingConfig.
localityAwareRoutingPercent		 string (int64)

Percentage of traffic that a load balancer node sends to healthy backends in its availability zone. The rest is divided equally between other zones. For details about zone-aware routing, see documentation.

If there are no healthy backends in an availability zone, all the traffic is divided between other zones.

If strictLocality is true, the specified value is ignored. A load balancer node sends all the traffic within its availability zone, regardless of backends' health.

Default value: 0.

Acceptable values are 0 to 100, inclusive.
http.
loadBalancingConfig.
strictLocality		 boolean (boolean)

Specifies whether a load balancer node should only send traffic to backends in its availability zone, regardless of their health, and ignore backends in other zones.

If set to true and there are no healthy backends in the zone, the node in this zone will respond to incoming traffic with errors. For details about strict locality, see documentation.

If strict_locality is true, the value specified in localityAwareRoutingPercent is ignored.

Default value: false.
http.
loadBalancingConfig.
mode		 string

Load balancing mode for the backend.

For details about load balancing modes, see documentation.

A load balancing mode resource. For details about the concept, see documentation.

  • ROUND_ROBIN: Round robin load balancing mode.

    All endpoints of the backend take their turns to receive requests attributed to the backend.

  • RANDOM: Random load balancing mode. Default value.

    For a request attributed to the backend, an endpoint that receives it is picked at random.

  • LEAST_REQUEST: Least request load balancing mode.

    To pick an endpoint that receives a request attributed to the backend, the power of two choices algorithm is used; that is, two endpoints are picked at random, and the request is sent to the one which has the fewest active requests.

  • MAGLEV_HASH: Maglev hashing load balancing mode.

    Each endpoint is hashed, and a hash table with 65537 rows is filled accordingly, so that every endpoint occupies the same amount of rows. An attribute of each request is also hashed by the same function (if session affinity is enabled for the backend group, the attribute to hash is specified in session affinity configuration). The row with the same number as the resulting value is looked up in the table to determine the endpoint that receives the request.

    If the backend group with session affinity enabled contains more than one backend with positive weight, endpoints for backends with MAGLEV_HASH load balancing mode are picked at RANDOM instead.
http.
port		 string (int64)

Port used by all targets to receive traffic.

Acceptable values are 0 to 65535, inclusive.
http.
healthchecks[]		 object

Health checks to perform on targets from target groups. For details about health checking, see documentation.

If no health checks are specified, active health checking is not performed.
http.
healthchecks[].
timeout		 string

Required. Health check timeout.

The timeout is the time allowed for the target to respond to a check. If the target doesn't respond in time, the check is considered failed.
http.
healthchecks[].
interval		 string

Required. Base interval between consecutive health checks.
http.
healthchecks[].
intervalJitterPercent		 number (double)
http.
healthchecks[].
healthyThreshold		 string (int64)

Number of consecutive successful health checks required to mark an unhealthy target as healthy.

Both 0 and 1 values amount to one successful check required.

The value is ignored when a load balancer is initialized; a target is marked healthy after one successful check.

Default value: 0.
http.
healthchecks[].
unhealthyThreshold		 string (int64)

Number of consecutive failed health checks required to mark a healthy target as unhealthy.

Both 0 and 1 values amount to one unsuccessful check required.

The value is ignored if a health check is failed due to an HTTP 503 Service Unavailable response from the target (not applicable to TCP stream health checks). The target is immediately marked unhealthy.

Default value: 0.
http.
healthchecks[].
healthcheckPort		 string (int64)

Port used for health checks.

If not specified, the backend port (port or port) is used for health checks.

Acceptable values are 0 to 65535, inclusive.
http.
healthchecks[].
stream		 object
TCP stream health check settings.
http.healthchecks[] includes only one of the fields stream, http, grpc
http.
healthchecks[].
stream.
send		 object

Message sent to targets during TCP data transfer.

If not specified, no data is sent to the target.

A health check payload resource.
http.
healthchecks[].
stream.
send.
text		 string

Payload text.

The string length in characters must be greater than 0.
http.
healthchecks[].
stream.
receive		 object

Data that must be contained in the messages received from targets for a successful health check.

If not specified, no messages are expected from targets, and those that are received are not checked.

A health check payload resource.
http.
healthchecks[].
stream.
receive.
text		 string

Payload text.

The string length in characters must be greater than 0.
http.
healthchecks[].
http		 object
HTTP health check settings.
http.healthchecks[] includes only one of the fields stream, http, grpc
http.
healthchecks[].
http.
host		 string

Value for the HTTP/1.1 Host header or the HTTP/2 :authority pseudo-header used in requests to targets.
http.
healthchecks[].
http.
path		 string

Required. HTTP path used in requests to targets: request URI for HTTP/1.1 request line or value for the HTTP/2 :path pseudo-header.
http.
healthchecks[].
http.
useHttp2		 boolean (boolean)

Enables HTTP/2 usage in health checks.

Default value: false, HTTP/1.1 is used.
http.
healthchecks[].
grpc		 object
gRPC health check settings.
http.healthchecks[] includes only one of the fields stream, http, grpc
http.
healthchecks[].
grpc.
serviceName		 string

Name of the gRPC service to be checked.

If not specified, overall health is checked.

For details about the concept, see GRPC Health Checking Protocol.
http.
healthchecks[].
plaintext		 object
http.healthchecks[] includes only one of the fields plaintext, tls

Transport settings to be used instead of the settings configured per-cluster
http.
healthchecks[].
tls		 object
http.healthchecks[] includes only one of the fields plaintext, tls

Transport settings to be used instead of the settings configured per-cluster
http.
healthchecks[].
tls.
sni		 string

SNI string for TLS connections.
http.
healthchecks[].
tls.
validationContext		 object

Validation context for backend TLS connections.

A TLS validation context resource.
http.
healthchecks[].
tls.
validationContext.
trustedCaId		 string
http.healthchecks[].tls.validationContext includes only one of the fields trustedCaId, trustedCaBytes
http.
healthchecks[].
tls.
validationContext.
trustedCaBytes		 string
http.healthchecks[].tls.validationContext includes only one of the fields trustedCaId, trustedCaBytes

X.509 certificate contents in PEM format.
http.
tls		 object
Settings for TLS connections between load balancer nodes and backend targets. If specified, the load balancer establishes TLS-encrypted TCP connections with targets and compares received certificates with the one specified in validationContext. If not specified, the load balancer establishes unencrypted TCP connections with targets.
http.
tls.
sni		 string

Server Name Indication (SNI) string for TLS connections.
http.
tls.
validationContext		 object

Validation context for TLS connections.

A TLS validation context resource.
http.
tls.
validationContext.
trustedCaId		 string
http.tls.validationContext includes only one of the fields trustedCaId, trustedCaBytes
http.
tls.
validationContext.
trustedCaBytes		 string
http.tls.validationContext includes only one of the fields trustedCaId, trustedCaBytes

X.509 certificate contents in PEM format.
http.
useHttp2		 boolean (boolean)

Enables HTTP/2 usage in connections between load balancer nodes and backend targets.

Default value: false, HTTP/1.1 is used.
http.
targetGroups		 object
Target groups that belong to the backend. For details about target groups, see documentation.
http includes only one of the fields targetGroups, storageBucket
http.
targetGroups.
targetGroupIds[]		 string

Required. List of ID's of target groups that belong to the backend.

To get the ID's of all available target groups, make a list request.

Must contain at least one element.
http.
storageBucket		 object
Object Storage bucket to use as the backend. For details about buckets, see documentation. If a bucket is used as a backend, the list of bucket objects and the objects themselves must be publicly accessible. For instructions, see documentation.
http includes only one of the fields targetGroups, storageBucket
http.
storageBucket.
bucket		 string

Required. Name of the bucket.
grpc object
gRPC backend to add to the backend group.
includes only one of the fields http, grpc, stream
grpc.
name		 string

Required. Name of the backend.

Value must match the regular expression [a-z][-a-z0-9]{1,61}[a-z0-9].
grpc.
backendWeight		 integer (int64)

Backend weight. Traffic is distributed between backends of a backend group according to their weights.

Weights must be set either for all backends of a group or for none of them. Setting no weights is the same as setting equal non-zero weights for all backends.

If the weight is non-positive, traffic is not sent to the backend.
grpc.
loadBalancingConfig		 object
Load balancing configuration for the backend.
grpc.
loadBalancingConfig.
panicThreshold		 string (int64)

Threshold for panic mode.

If percentage of healthy backends in the group drops below threshold, panic mode will be activated and traffic will be routed to all backends, regardless of their health check status. This helps to avoid overloading healthy backends. For details about panic mode, see documentation.

If the value is 0, panic mode will never be activated and traffic is routed only to healthy backends at all times.

Default value: 0.

Acceptable values are 0 to 100, inclusive.
grpc.
loadBalancingConfig.
localityAwareRoutingPercent		 string (int64)

Percentage of traffic that a load balancer node sends to healthy backends in its availability zone. The rest is divided equally between other zones. For details about zone-aware routing, see documentation.

If there are no healthy backends in an availability zone, all the traffic is divided between other zones.

If strictLocality is true, the specified value is ignored. A load balancer node sends all the traffic within its availability zone, regardless of backends' health.

Default value: 0.

Acceptable values are 0 to 100, inclusive.
grpc.
loadBalancingConfig.
strictLocality		 boolean (boolean)

Specifies whether a load balancer node should only send traffic to backends in its availability zone, regardless of their health, and ignore backends in other zones.

If set to true and there are no healthy backends in the zone, the node in this zone will respond to incoming traffic with errors. For details about strict locality, see documentation.

If strict_locality is true, the value specified in localityAwareRoutingPercent is ignored.

Default value: false.
grpc.
loadBalancingConfig.
mode		 string

Load balancing mode for the backend.

For details about load balancing modes, see documentation.

A load balancing mode resource. For details about the concept, see documentation.

  • ROUND_ROBIN: Round robin load balancing mode.

    All endpoints of the backend take their turns to receive requests attributed to the backend.

  • RANDOM: Random load balancing mode. Default value.

    For a request attributed to the backend, an endpoint that receives it is picked at random.

  • LEAST_REQUEST: Least request load balancing mode.

    To pick an endpoint that receives a request attributed to the backend, the power of two choices algorithm is used; that is, two endpoints are picked at random, and the request is sent to the one which has the fewest active requests.

  • MAGLEV_HASH: Maglev hashing load balancing mode.

    Each endpoint is hashed, and a hash table with 65537 rows is filled accordingly, so that every endpoint occupies the same amount of rows. An attribute of each request is also hashed by the same function (if session affinity is enabled for the backend group, the attribute to hash is specified in session affinity configuration). The row with the same number as the resulting value is looked up in the table to determine the endpoint that receives the request.

    If the backend group with session affinity enabled contains more than one backend with positive weight, endpoints for backends with MAGLEV_HASH load balancing mode are picked at RANDOM instead.
grpc.
port		 string (int64)

Port used by all targets to receive traffic.

Acceptable values are 0 to 65535, inclusive.
grpc.
healthchecks[]		 object

Health checks to perform on targets from target groups. For details about health checking, see documentation.

If no health checks are specified, active health checking is not performed.
grpc.
healthchecks[].
timeout		 string

Required. Health check timeout.

The timeout is the time allowed for the target to respond to a check. If the target doesn't respond in time, the check is considered failed.
grpc.
healthchecks[].
interval		 string

Required. Base interval between consecutive health checks.
grpc.
healthchecks[].
intervalJitterPercent		 number (double)
grpc.
healthchecks[].
healthyThreshold		 string (int64)

Number of consecutive successful health checks required to mark an unhealthy target as healthy.

Both 0 and 1 values amount to one successful check required.

The value is ignored when a load balancer is initialized; a target is marked healthy after one successful check.

Default value: 0.
grpc.
healthchecks[].
unhealthyThreshold		 string (int64)

Number of consecutive failed health checks required to mark a healthy target as unhealthy.

Both 0 and 1 values amount to one unsuccessful check required.

The value is ignored if a health check is failed due to an HTTP 503 Service Unavailable response from the target (not applicable to TCP stream health checks). The target is immediately marked unhealthy.

Default value: 0.
grpc.
healthchecks[].
healthcheckPort		 string (int64)

Port used for health checks.

If not specified, the backend port (port or port) is used for health checks.

Acceptable values are 0 to 65535, inclusive.
grpc.
healthchecks[].
stream		 object
TCP stream health check settings.
grpc.healthchecks[] includes only one of the fields stream, http, grpc
grpc.
healthchecks[].
stream.
send		 object

Message sent to targets during TCP data transfer.

If not specified, no data is sent to the target.

A health check payload resource.
grpc.
healthchecks[].
stream.
send.
text		 string

Payload text.

The string length in characters must be greater than 0.
grpc.
healthchecks[].
stream.
receive		 object

Data that must be contained in the messages received from targets for a successful health check.

If not specified, no messages are expected from targets, and those that are received are not checked.

A health check payload resource.
grpc.
healthchecks[].
stream.
receive.
text		 string

Payload text.

The string length in characters must be greater than 0.
grpc.
healthchecks[].
http		 object
HTTP health check settings.
grpc.healthchecks[] includes only one of the fields stream, http, grpc
grpc.
healthchecks[].
http.
host		 string

Value for the HTTP/1.1 Host header or the HTTP/2 :authority pseudo-header used in requests to targets.
grpc.
healthchecks[].
http.
path		 string

Required. HTTP path used in requests to targets: request URI for HTTP/1.1 request line or value for the HTTP/2 :path pseudo-header.
grpc.
healthchecks[].
http.
useHttp2		 boolean (boolean)

Enables HTTP/2 usage in health checks.

Default value: false, HTTP/1.1 is used.
grpc.
healthchecks[].
grpc		 object
gRPC health check settings.
grpc.healthchecks[] includes only one of the fields stream, http, grpc
grpc.
healthchecks[].
grpc.
serviceName		 string

Name of the gRPC service to be checked.

If not specified, overall health is checked.

For details about the concept, see GRPC Health Checking Protocol.
grpc.
healthchecks[].
plaintext		 object
grpc.healthchecks[] includes only one of the fields plaintext, tls

Transport settings to be used instead of the settings configured per-cluster
grpc.
healthchecks[].
tls		 object
grpc.healthchecks[] includes only one of the fields plaintext, tls

Transport settings to be used instead of the settings configured per-cluster
grpc.
healthchecks[].
tls.
sni		 string

SNI string for TLS connections.
grpc.
healthchecks[].
tls.
validationContext		 object

Validation context for backend TLS connections.

A TLS validation context resource.
grpc.
healthchecks[].
tls.
validationContext.
trustedCaId		 string
grpc.healthchecks[].tls.validationContext includes only one of the fields trustedCaId, trustedCaBytes
grpc.
healthchecks[].
tls.
validationContext.
trustedCaBytes		 string
grpc.healthchecks[].tls.validationContext includes only one of the fields trustedCaId, trustedCaBytes

X.509 certificate contents in PEM format.
grpc.
tls		 object
Settings for TLS connections between load balancer nodes and backend targets. If specified, the load balancer establishes HTTPS (HTTP over TLS) connections with targets and compares received certificates with the one specified in validationContext. If not specified, the load balancer establishes unencrypted HTTP connections with targets.
grpc.
tls.
sni		 string

Server Name Indication (SNI) string for TLS connections.
grpc.
tls.
validationContext		 object

Validation context for TLS connections.

A TLS validation context resource.
grpc.
tls.
validationContext.
trustedCaId		 string
grpc.tls.validationContext includes only one of the fields trustedCaId, trustedCaBytes
grpc.
tls.
validationContext.
trustedCaBytes		 string
grpc.tls.validationContext includes only one of the fields trustedCaId, trustedCaBytes

X.509 certificate contents in PEM format.
grpc.
targetGroups		 object
Target groups that belong to the backend. For details about target groups, see documentation.
grpc.
targetGroups.
targetGroupIds[]		 string

Required. List of ID's of target groups that belong to the backend.

To get the ID's of all available target groups, make a list request.

Must contain at least one element.
stream object
New settings for the Stream backend.
includes only one of the fields http, grpc, stream
stream.
name		 string

Name of the backend.

Value must match the regular expression [a-z][-a-z0-9]{1,61}[a-z0-9].
stream.
backendWeight		 integer (int64)

Backend weight. Traffic is distributed between backends of a backend group according to their weights.

Weights must be set either for all backends in a group or for none of them. Setting no weights is the same as setting equal non-zero weights for all backends.

If the weight is non-positive, traffic is not sent to the backend.
stream.
loadBalancingConfig		 object
Load balancing configuration for the backend.
stream.
loadBalancingConfig.
panicThreshold		 string (int64)

Threshold for panic mode.

If percentage of healthy backends in the group drops below threshold, panic mode will be activated and traffic will be routed to all backends, regardless of their health check status. This helps to avoid overloading healthy backends. For details about panic mode, see documentation.

If the value is 0, panic mode will never be activated and traffic is routed only to healthy backends at all times.

Default value: 0.

Acceptable values are 0 to 100, inclusive.
stream.
loadBalancingConfig.
localityAwareRoutingPercent		 string (int64)

Percentage of traffic that a load balancer node sends to healthy backends in its availability zone. The rest is divided equally between other zones. For details about zone-aware routing, see documentation.

If there are no healthy backends in an availability zone, all the traffic is divided between other zones.

If strictLocality is true, the specified value is ignored. A load balancer node sends all the traffic within its availability zone, regardless of backends' health.

Default value: 0.

Acceptable values are 0 to 100, inclusive.
stream.
loadBalancingConfig.
strictLocality		 boolean (boolean)

Specifies whether a load balancer node should only send traffic to backends in its availability zone, regardless of their health, and ignore backends in other zones.

If set to true and there are no healthy backends in the zone, the node in this zone will respond to incoming traffic with errors. For details about strict locality, see documentation.

If strict_locality is true, the value specified in localityAwareRoutingPercent is ignored.

Default value: false.
stream.
loadBalancingConfig.
mode		 string

Load balancing mode for the backend.

For details about load balancing modes, see documentation.

A load balancing mode resource. For details about the concept, see documentation.

  • ROUND_ROBIN: Round robin load balancing mode.

    All endpoints of the backend take their turns to receive requests attributed to the backend.

  • RANDOM: Random load balancing mode. Default value.

    For a request attributed to the backend, an endpoint that receives it is picked at random.

  • LEAST_REQUEST: Least request load balancing mode.

    To pick an endpoint that receives a request attributed to the backend, the power of two choices algorithm is used; that is, two endpoints are picked at random, and the request is sent to the one which has the fewest active requests.

  • MAGLEV_HASH: Maglev hashing load balancing mode.

    Each endpoint is hashed, and a hash table with 65537 rows is filled accordingly, so that every endpoint occupies the same amount of rows. An attribute of each request is also hashed by the same function (if session affinity is enabled for the backend group, the attribute to hash is specified in session affinity configuration). The row with the same number as the resulting value is looked up in the table to determine the endpoint that receives the request.

    If the backend group with session affinity enabled contains more than one backend with positive weight, endpoints for backends with MAGLEV_HASH load balancing mode are picked at RANDOM instead.
stream.
port		 string (int64)

Port used by all targets to receive traffic.

Acceptable values are 0 to 65535, inclusive.
stream.
healthchecks[]		 object

Health checks to perform on targets from target groups. For details about health checking, see documentation.

If no health checks are specified, active health checking is not performed.
stream.
healthchecks[].
timeout		 string

Required. Health check timeout.

The timeout is the time allowed for the target to respond to a check. If the target doesn't respond in time, the check is considered failed.
stream.
healthchecks[].
interval		 string

Required. Base interval between consecutive health checks.
stream.
healthchecks[].
intervalJitterPercent		 number (double)
stream.
healthchecks[].
healthyThreshold		 string (int64)

Number of consecutive successful health checks required to mark an unhealthy target as healthy.

Both 0 and 1 values amount to one successful check required.

The value is ignored when a load balancer is initialized; a target is marked healthy after one successful check.

Default value: 0.
stream.
healthchecks[].
unhealthyThreshold		 string (int64)

Number of consecutive failed health checks required to mark a healthy target as unhealthy.

Both 0 and 1 values amount to one unsuccessful check required.

The value is ignored if a health check is failed due to an HTTP 503 Service Unavailable response from the target (not applicable to TCP stream health checks). The target is immediately marked unhealthy.

Default value: 0.
stream.
healthchecks[].
healthcheckPort		 string (int64)

Port used for health checks.

If not specified, the backend port (port or port) is used for health checks.

Acceptable values are 0 to 65535, inclusive.
stream.
healthchecks[].
stream		 object
TCP stream health check settings.
stream.healthchecks[] includes only one of the fields stream, http, grpc
stream.
healthchecks[].
stream.
send		 object

Message sent to targets during TCP data transfer.

If not specified, no data is sent to the target.

A health check payload resource.
stream.
healthchecks[].
stream.
send.
text		 string

Payload text.

The string length in characters must be greater than 0.
stream.
healthchecks[].
stream.
receive		 object

Data that must be contained in the messages received from targets for a successful health check.

If not specified, no messages are expected from targets, and those that are received are not checked.

A health check payload resource.
stream.
healthchecks[].
stream.
receive.
text		 string

Payload text.

The string length in characters must be greater than 0.
stream.
healthchecks[].
http		 object
HTTP health check settings.
stream.healthchecks[] includes only one of the fields stream, http, grpc
stream.
healthchecks[].
http.
host		 string

Value for the HTTP/1.1 Host header or the HTTP/2 :authority pseudo-header used in requests to targets.
stream.
healthchecks[].
http.
path		 string

Required. HTTP path used in requests to targets: request URI for HTTP/1.1 request line or value for the HTTP/2 :path pseudo-header.
stream.
healthchecks[].
http.
useHttp2		 boolean (boolean)

Enables HTTP/2 usage in health checks.

Default value: false, HTTP/1.1 is used.
stream.
healthchecks[].
grpc		 object
gRPC health check settings.
stream.healthchecks[] includes only one of the fields stream, http, grpc
stream.
healthchecks[].
grpc.
serviceName		 string

Name of the gRPC service to be checked.

If not specified, overall health is checked.

For details about the concept, see GRPC Health Checking Protocol.
stream.
healthchecks[].
plaintext		 object
stream.healthchecks[] includes only one of the fields plaintext, tls

Transport settings to be used instead of the settings configured per-cluster
stream.
healthchecks[].
tls		 object
stream.healthchecks[] includes only one of the fields plaintext, tls

Transport settings to be used instead of the settings configured per-cluster
stream.
healthchecks[].
tls.
sni		 string

SNI string for TLS connections.
stream.
healthchecks[].
tls.
validationContext		 object

Validation context for backend TLS connections.

A TLS validation context resource.
stream.
healthchecks[].
tls.
validationContext.
trustedCaId		 string
stream.healthchecks[].tls.validationContext includes only one of the fields trustedCaId, trustedCaBytes
stream.
healthchecks[].
tls.
validationContext.
trustedCaBytes		 string
stream.healthchecks[].tls.validationContext includes only one of the fields trustedCaId, trustedCaBytes

X.509 certificate contents in PEM format.
stream.
tls		 object
Settings for TLS connections between load balancer nodes and backend targets. If specified, the load balancer establishes HTTPS (HTTP over TLS) connections with targets and compares received certificates with the one specified in validationContext. If not specified, the load balancer establishes unencrypted HTTP connections with targets.
stream.
tls.
sni		 string

Server Name Indication (SNI) string for TLS connections.
stream.
tls.
validationContext		 object

Validation context for TLS connections.

A TLS validation context resource.
stream.
tls.
validationContext.
trustedCaId		 string
stream.tls.validationContext includes only one of the fields trustedCaId, trustedCaBytes
stream.
tls.
validationContext.
trustedCaBytes		 string
stream.tls.validationContext includes only one of the fields trustedCaId, trustedCaBytes

X.509 certificate contents in PEM format.
stream.
enableProxyProtocol		 boolean (boolean)

If set, proxy protocol will be enabled for this backend.
stream.
targetGroups		 object
Target groups that belong to the backend.
stream.
targetGroups.
targetGroupIds[]		 string

Required. List of ID's of target groups that belong to the backend.

To get the ID's of all available target groups, make a list request.

Must contain at least one element.

Response

HTTP Code: 200 - OK

{
  "id": "string",
  "description": "string",
  "createdAt": "string",
  "createdBy": "string",
  "modifiedAt": "string",
  "done": true,
  "metadata": "object",

  //  includes only one of the fields `error`, `response`
  "error": {
    "code": "integer",
    "message": "string",
    "details": [
      "object"
    ]
  },
  "response": "object",
  // end of the list of possible fields

}

An Operation resource. For more information, see Operation.

Field Description
id string

ID of the operation.
description string

Description of the operation. 0-256 characters long.
createdAt string (date-time)

Creation timestamp.

String in RFC3339 text format. The range of possible values is from 0001-01-01T00:00:00Z to 9999-12-31T23:59:59.999999999Z, i.e. from 0 to 9 digits for fractions of a second.

To work with values in this field, use the APIs described in the Protocol Buffers reference. In some languages, built-in datetime utilities do not support nanosecond precision (9 digits).
createdBy string

ID of the user or service account who initiated the operation.
modifiedAt string (date-time)

The time when the Operation resource was last modified.

String in RFC3339 text format. The range of possible values is from 0001-01-01T00:00:00Z to 9999-12-31T23:59:59.999999999Z, i.e. from 0 to 9 digits for fractions of a second.

To work with values in this field, use the APIs described in the Protocol Buffers reference. In some languages, built-in datetime utilities do not support nanosecond precision (9 digits).
done boolean (boolean)

If the value is false, it means the operation is still in progress. If true, the operation is completed, and either error or response is available.
metadata object

Service-specific metadata associated with the operation. It typically contains the ID of the target resource that the operation is performed on. Any method that returns a long-running operation should document the metadata type, if any.
error object
The error result of the operation in case of failure or cancellation.
includes only one of the fields error, response
error.
code		 integer (int32)

Error code. An enum value of google.rpc.Code.
error.
message		 string

An error message.
error.
details[]		 object

A list of messages that carry the error details.
response object
includes only one of the fields error, response

The normal response of the operation in case of success. If the original method returns no data on success, such as Delete, the response is google.protobuf.Empty. If the original method is the standard Create/Update, the response should be the target resource of the operation. Any method that returns a long-running operation should document the response type, if any.
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