Operator Command Flag Registration

Note the Cobra command flag registration in the Cmd function:

    operatorcommon.AddOperatorFlags(cmd, "0.0.0.0:8085")
    operatorcommon.AddIgnoreListFlags(cmd)
    err := providerflags.AddKubeConfigPathFlag(cmd)

The referenced operatorcommon path pulls in command flags from provider/oerator/operatorcommon/operator_flags.go. Amongst the flags enabled on the provider-services hostname-operator command is the --listen which allows the specification of a HTTP endpoint address/port of the operator.

By default and without explicitly calling the --listen flag, the hostname-operator will listen on all local interfaces (0.0.0.0) and port 8085 based on the default established on the Cobra command flag registration arguments.

Within operatorcommon this specific flag - along with other command operator flags - are registered via these functions (Listen Address flag example):

    cmd.Flags().String(providerflags.FlagListenAddress, defaultListenAddress, "listen address for web server")
    if err := viper.BindPFlag(providerflags.FlagListenAddress, cmd.Flags().Lookup(providerflags.FlagListenAddress)); err != nil {
        panic(err)
    }