Extract named constant and method

lib/mrsk/commands/traefik.rb

@@ -1,4 +1,6 @@
 class Mrsk::Commands::Traefik < Mrsk::Commands::Base
+  CONTAINER_PORT = 80
+
   def run
     docker :run, "--name traefik",
       "--detach",
@@ -46,12 +48,15 @@ class Mrsk::Commands::Traefik < Mrsk::Commands::Base
   end
 
   def port    
-    traefik_port = config.raw_config.dig(:traefik, "host_port") || 80
-    "#{traefik_port}:80"
+    "#{host_port}:#{CONTAINER_PORT}"
   end
 
   private
     def cmd_args
       (config.raw_config.dig(:traefik, "args") || { }).collect { |(key, value)| [ "--#{key}", value ] }.flatten
     end
+
+    def host_port
+      config.raw_config.dig(:traefik, "host_port") || CONTAINER_PORT
+    end
 end