Amazon GameLift Service
API Reference (API Version 2015-10-01)


Updates the current run-time configuration for the specified fleet, which tells Amazon GameLift how to launch server processes on instances in the fleet. You can update a fleet's run-time configuration at any time after the fleet is created; it does not need to be in an ACTIVE status.

To update run-time configuration, specify the fleet ID and provide a RuntimeConfiguration object with the updated collection of server process configurations.

Each instance in a Amazon GameLift fleet checks regularly for an updated run-time configuration and changes how it launches server processes to comply with the latest version. Existing server processes are not affected by the update; they continue to run until they end, while Amazon GameLift simply adds new server processes to fit the current run-time configuration. As a result, the run-time configuration changes are applied gradually as existing processes shut down and new processes are launched in Amazon GameLift's normal process recycling activity.

Fleet-related operations include:

Request Syntax

{ "FleetId": "string", "RuntimeConfiguration": { "GameSessionActivationTimeoutSeconds": number, "MaxConcurrentGameSessionActivations": number, "ServerProcesses": [ { "ConcurrentExecutions": number, "LaunchPath": "string", "Parameters": "string" } ] } }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.


In the following list, the required parameters are described first.


Unique identifier for a fleet to update run-time configuration for.

Type: String

Pattern: ^fleet-\S+

Required: Yes


Instructions for launching server processes on each instance in the fleet. The run-time configuration for a fleet has a collection of server process configurations, one for each type of server process to run on an instance. A server process configuration specifies the location of the server executable, launch parameters, and the number of concurrent processes with that configuration to maintain on each instance.

Type: RuntimeConfiguration object

Required: Yes

Response Syntax

{ "RuntimeConfiguration": { "GameSessionActivationTimeoutSeconds": number, "MaxConcurrentGameSessionActivations": number, "ServerProcesses": [ { "ConcurrentExecutions": number, "LaunchPath": "string", "Parameters": "string" } ] } }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.


The run-time configuration currently in force. If the update was successful, this object matches the one in the request.

Type: RuntimeConfiguration object


For information about the errors that are common to all actions, see Common Errors.


The service encountered an unrecoverable internal failure while processing the request. Clients can retry such requests immediately or after a waiting period.

HTTP Status Code: 500


The requested operation would cause a conflict with the current state of a resource associated with the request and/or the fleet. Resolve the conflict before retrying.

HTTP Status Code: 400


One or more parameter values in the request are invalid. Correct the invalid parameter values before retrying.

HTTP Status Code: 400


A service resource associated with the request could not be found. Clients should not retry such requests.

HTTP Status Code: 400


The client failed authentication. Clients should not retry such requests.

HTTP Status Code: 400

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: