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# EngineAction

Specify one of the following values:

- ShowStatus. Return the status of all child servers (online, offline, or down). The EngineID parameter is ignored in this case. Online indicates that the server is running, and DAH is sending actions to it. Offline indicates that the DAH is not sending actions to the child server, but it might or might not be running. Down indicates that the server is not running, or that DAH cannot connect to it. When DistributionMethod is set to `0` (failover), the action also returns the ID of the primary server.

- PowerUp. Brings the EngineID child servers online.

- PowerDown. Takes the EngineID child servers offline.

- ChangeWeight. Dynamically changes the weight assigned through the Weight configuration parameter to the EngineID child servers.

- EngineAdd. Add a child server. If you use this value, you must also set the EngineHost and EnginePort parameters. You can set the EngineName parameter if UseEngineAlias is enabled, although it is not required.

- SetPrimaryEngine. Sets a child server as the primary server that DAH sends actions to. This action is available only when DistributionMethod is set to `0` (failover).

  In mirror mode, specify the new primary server by using the EngineID or EngineName parameter. In non-mirror mode, when you have child server groups, you can set a primary server for each server group by using the PrimaryEngines parameter.

- Ping. Manually ping a child server. The effect of the manual ping is the same as automatic ping, and updates the status of the child server.

Actions: | EngineManagement
Type: | String
Default: |
Example: | `EngineAction=PowerDown`
See Also: | EngineHost EngineName EnginePort PingPeriodInSec configuration parameter Weight configuration parameter

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