filerOptions.collection=cmdServer.Flag.String("filer.collection","","all data will be stored in this collection")
filerOptions.port=cmdServer.Flag.Int("filer.port",8888,"filer server http listen port")
filerOptions.portGrpc=cmdServer.Flag.Int("filer.port.grpc",18888,"filer server grpc listen port")
filerOptions.publicPort=cmdServer.Flag.Int("filer.port.public",0,"filer server public http listen port")
filerOptions.defaultReplicaPlacement=cmdServer.Flag.String("filer.defaultReplicaPlacement","","default replication type. If not specified, use master setting.")
filerOptions.disableDirListing=cmdServer.Flag.Bool("filer.disableDirListing",false,"turn off directory listing")