fix ssh interface docs for amazon builders

builder/amazon/common/run_config.go

@@ -377,8 +377,20 @@ type RunConfig struct {
 	WindowsPasswordTimeout time.Duration `mapstructure:"windows_password_timeout" required:"false"`
 
 	// Communicator settings
-	Comm         communicator.Config `mapstructure:",squash"`
+	Comm communicator.Config `mapstructure:",squash"`
-	SSHInterface string              `mapstructure:"ssh_interface"`
+
+	// One of `public_ip`, `private_ip`, `public_dns`, or `private_dns`. If
+	//    set, either the public IP address, private IP address, public DNS name
+	//    or private DNS name will used as the host for SSH. The default behaviour
+	//    if inside a VPC is to use the public IP address if available, otherwise
+	//    the private IP address will be used. If not in a VPC the public DNS name
+	//    will be used. Also works for WinRM.
+	//
+	//    Where Packer is configured for an outbound proxy but WinRM traffic
+	//    should be direct, `ssh_interface` must be set to `private_dns` and
+	//    `<region>.compute.internal` included in the `NO_PROXY` environment
+	//    variable.
+	SSHInterface string `mapstructure:"ssh_interface"`
 }
 
 func (c *RunConfig) Prepare(ctx *interpolate.Context) []error {

website/source/docs/builders/amazon-ebssurrogate.html.md.erb

@@ -97,7 +97,6 @@ Block devices can be nested in the
 
 <%= partial "partials/helper/communicator/Config-not-required" %>
 <%= partial "partials/helper/communicator/SSH-not-required" %>
-<%= partial "partials/helper/communicator/SSHInterface-not-required" %>
 
 ## Basic Example
 

website/source/docs/builders/amazon-ebsvolume.html.md.erb

@@ -99,7 +99,6 @@ Block devices can be nested in the
 
 <%= partial "partials/helper/communicator/Config-not-required" %>
 <%= partial "partials/helper/communicator/SSH-not-required" %>
-<%= partial "partials/helper/communicator/SSHInterface-not-required" %>
 
 ## Basic Example
 

website/source/docs/builders/amazon-instance.html.md.erb

@@ -110,7 +110,6 @@ Block devices can be nested in the
 
 <%= partial "partials/helper/communicator/Config-not-required" %>
 <%= partial "partials/helper/communicator/SSH-not-required" %>
-<%= partial "partials/helper/communicator/SSHInterface-not-required" %>
 
 ## Basic Example
 

website/source/partials/builder/amazon/common/_RunConfig-not-required.html.md

@@ -285,4 +285,15 @@
     password for Windows instances. Defaults to 20 minutes. Example value:
     10m
     
--   `ssh_interface` (string) - SSH Interface
+-   `ssh_interface` (string) - One of `public_ip`, `private_ip`, `public_dns`, or `private_dns`. If
+       set, either the public IP address, private IP address, public DNS name
+       or private DNS name will used as the host for SSH. The default behaviour
+       if inside a VPC is to use the public IP address if available, otherwise
+       the private IP address will be used. If not in a VPC the public DNS name
+       will be used. Also works for WinRM.
+    
+       Where Packer is configured for an outbound proxy but WinRM traffic
+       should be direct, `ssh_interface` must be set to `private_dns` and
+       `<region>.compute.internal` included in the `NO_PROXY` environment
+       variable.
+