fs.StringVar(&Region,"region",defaultString("REGION",_region),"avaliable region. or use REGION env variable, value: sh etc.")
fs.StringVar(&Zone,"zone",defaultString("ZONE",_zone),"avaliable zone. or use ZONE env variable, value: sh001/sh002 etc.")
fs.StringVar(&AppID,"appid",os.Getenv("APP_ID"),"appid is global unique application id, register by service tree. or use APP_ID env variable.")
fs.StringVar(&DeployEnv,"deploy.env",defaultString("DEPLOY_ENV",_deployEnv),"deploy env. or use DEPLOY_ENV env variable, value: dev/fat1/uat/pre/prod etc.")
fs.StringVar(&Color,"deploy.color",os.Getenv("DEPLOY_COLOR"),"deploy.color is the identification of different experimental group.")