Use registry.port to construct the registry host

app/models/project.rb

@@ -332,15 +332,15 @@ class Project < ActiveRecord::Base
     @container_registry_repository ||= begin
       token = Auth::ContainerRegistryAuthenticationService.full_access_token(path_with_namespace)
       url = Gitlab.config.registry.api_url
-      host = Gitlab.config.registry.host
-      registry = ContainerRegistry::Registry.new(url, token: token, path: host)
+      host_port = Gitlab.config.registry.host_port
+      registry = ContainerRegistry::Registry.new(url, token: token, path: host_port)
       registry[path_with_namespace]
     end
   end
 
   def container_registry_repository_url
     if Gitlab.config.registry.enabled
-      "#{Gitlab.config.registry.host}/#{path_with_namespace}"
+      "#{Gitlab.config.registry.host_port}/#{path_with_namespace}"
     end
   end
 

app/views/projects/container_registry/index.html.haml

@@ -16,7 +16,7 @@
         To start using container images hosted on GitLab you first need to login:
         %pre
           %code
-            docker login #{Gitlab.config.registry.host}
+            docker login #{Gitlab.config.registry.host_port}
         %br
         Then you are free to create and upload a container image with build and push commands:
         %pre

config/initializers/1_settings.rb

@@ -249,9 +249,11 @@ Settings.artifacts['max_size']   ||= 100 # in megabytes
 Settings['registry'] ||= Settingslogic.new({})
 Settings.registry['enabled']       ||= false
 Settings.registry['host']          ||= "example.com"
+Settings.registry['port']          ||= nil
 Settings.registry['api_url']       ||= "http://localhost:5000/"
 Settings.registry['key']           ||= nil
 Settings.registry['issuer']        ||= nil
+Settings.registry['host_port']     ||= [Settings.registry['host'], Settings.registry['port']].join(':')
 
 #
 # Git LFS