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Is it possible to launch instance based on parameter passed to the heat template

For example, I have two nova instances defined in the template. 1. Oracle 2. MSSql and I have a boolean parameter isOracle

Is there a tag/condition I can use so that only one of the instances are launched. So lets say, if isOracle is true, only instance 1 will be launched, and vise versa. So even if there are 2 nova instances defined in the template, only one will be brought up depending on the parameter input.

Is it possible to launch instance based on parameter passed to the heat template

For example, I have two nova instances defined in the template. 1. Oracle 2. MSSql and I have a boolean parameter isOracleisOracle that will be specified by the user when the stack is created. Similar to imageId and flavorId

Is there a tag/condition I can use so that only one of the instances are launched. So lets say, if isOracle is true, only instance 1 will be launched, and vise versa. So even if there are 2 nova instances defined in the template, only one will be brought up depending on the parameter input.