Merge pull request #2263 from sweeneyb/dnsPort

Add support for dns port as a command line option

Author: slackpad

command/agent/command.go

@@ -91,6 +91,7 @@ func (c *Command) readConfig() *Config {
 	cmdFlags.StringVar(&cmdConfig.ClientAddr, "client", "", "address to bind client listeners to (DNS, HTTP, HTTPS, RPC)")
 	cmdFlags.StringVar(&cmdConfig.BindAddr, "bind", "", "address to bind server listeners to")
 	cmdFlags.IntVar(&cmdConfig.Ports.HTTP, "http-port", 0, "http port to use")
+	cmdFlags.IntVar(&cmdConfig.Ports.DNS, "dns-port", 0, "DNS port to use")
 	cmdFlags.StringVar(&cmdConfig.AdvertiseAddr, "advertise", "", "address to advertise instead of bind addr")
 	cmdFlags.StringVar(&cmdConfig.AdvertiseAddrWan, "advertise-wan", "", "address to advertise on wan instead of bind or advertise addr")
 

website/source/docs/agent/options.html.markdown

@@ -141,6 +141,11 @@ The options below are all specified on the command-line.
   it relies on proper configuration. Nodes in the same datacenter should be on a single
   LAN.
 
+* <a name="_dns_port"></a><a href="#_dns_port">`-dns-port`</a> - the DNS port to listen on.
+  This overrides the default port 8600. This option is very useful when deploying Consul
+  to an environment which communicates the DNS port through the environment e.g. PaaS like CloudFoundry, allowing
+  you to set the port directly via a Procfile.
+
 * <a name="_domain"></a><a href="#_domain">`-domain`</a> - By default, Consul responds to DNS queries
   in the "consul." domain. This flag can be used to change that domain. All queries in this domain
   are assumed to be handled by Consul and will not be recursively resolved.