红帽全球峰会3.5. 示例 5：基于角色的参数
使用 [ROLE]Parameters 参数，将 [ROLE] 替换为可组合角色，为特定角色设置参数。
例如，director 在 Controller 和 Compute 节点上配置 logrotate。要为 Controller 和 Compute 节点设置不同的 logrotate 参数，请创建一个环境文件，其中包含 'ControllerParameters' 和 'ComputeParameters' 参数，并为每个特定角色设置 logrotate 参数：
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