<p>The name of a deployment configuration associated with the IAM user or Amazon Web Services account.</p> <p>If not specified, the value configured in the deployment group is used as the default. If the deployment group does not have a deployment configuration associated with it, <code>CodeDeployDefault</code>.<code>OneAtATime</code> is used by default.</p>

<p> If true, then if an <code>ApplicationStop</code>, <code>BeforeBlockTraffic</code>, or <code>AfterBlockTraffic</code> deployment lifecycle event to an instance fails, then the deployment continues to the next deployment lifecycle event. For example, if <code>ApplicationStop</code> fails, the deployment continues with <code>DownloadBundle</code>. If <code>BeforeBlockTraffic</code> fails, the deployment continues with <code>BlockTraffic</code>. If <code>AfterBlockTraffic</code> fails, the deployment continues with <code>ApplicationStop</code>. </p> <p> If false or not specified, then if a lifecycle event fails during a deployment to an instance, that deployment fails. If deployment to that instance is part of an overall deployment and the number of healthy hosts is not less than the minimum number of healthy hosts, then a deployment to the next instance is attempted. </p> <p> During a deployment, the CodeDeploy agent runs the scripts specified for <code>ApplicationStop</code>, <code>BeforeBlockTraffic</code>, and <code>AfterBlockTraffic</code> in the AppSpec file from the previous successful deployment. (All other scripts are run from the AppSpec file in the current deployment.) If one of these scripts contains an error and does not run successfully, the deployment can fail. </p> <p> If the cause of the failure is a script from the last successful deployment that will never run successfully, create a new deployment and use <code>ignoreApplicationStopFailures</code> to specify that the <code>ApplicationStop</code>, <code>BeforeBlockTraffic</code>, and <code>AfterBlockTraffic</code> failures should be ignored. </p>

<p>Information about how CodeDeploy handles files that already exist in a deployment target location but weren't part of the previous successful deployment.</p> <p>The <code>fileExistsBehavior</code> parameter takes any of the following values:</p> <ul> <li> <p>DISALLOW: The deployment fails. This is also the default behavior if no option is specified.</p> </li> <li> <p>OVERWRITE: The version of the file from the application revision currently being deployed replaces the version already on the instance.</p> </li> <li> <p>RETAIN: The version of the file already on the instance is kept and used as part of the new deployment.</p> </li> </ul>