def _PostCreate(self):
    """Set the retention policy."""
    put_cmd = util.AWS_PREFIX + [
        '--region', self.region,
        'logs', 'put-retention-policy',
        '--log-group-name', self.name,
        '--retention-in-days', str(self.retention_in_days)
    ]
    vm_util.IssueCommand(put_cmd)