Add flag discovery.dns

docs/cli/server.md

@@ -218,6 +218,8 @@ The ```bor server``` command runs the Bor client.
 
 - ```bootnodes```: Comma separated enode URLs for P2P discovery bootstrap
 
+- ```discovery.dns```: Comma separated list of enrtree:// URLs which will be queried for nodes to connect to
+
 - ```maxpeers```: Maximum number of network peers (network disabled if set to 0) (default: 50)
 
 - ```maxpendpeers```: Maximum number of pending connection attempts (default: 50)

internal/cli/server/flags.go

@@ -806,6 +806,13 @@ func (c *Command) Flags(config *Config) *flagset.Flagset {
 		Default: c.cliConfig.P2P.TxArrivalWait,
 		Group:   "P2P",
 	})
+	f.SliceStringFlag(&flagset.SliceStringFlag{
+		Name:    "discovery.dns",
+		Usage:   "Comma separated list of enrtree:// URLs which will be queried for nodes to connect to",
+		Value:   &c.cliConfig.P2P.Discovery.DNS,
+		Default: c.cliConfig.P2P.Discovery.DNS,
+		Group:   "P2P",
+	})
 
 	// metrics
 	f.BoolFlag(&flagset.BoolFlag{