adding public_ssh_port flag to use a fixed port in the forwarding rules

builder/cloudstack/config.go

@@ -38,6 +38,7 @@ type Config struct {
 	Network                string   `mapstructure:"network"`
 	Project                string   `mapstructure:"project"`
 	PublicIPAddress        string   `mapstructure:"public_ip_address"`
+	PublicSSHPort          int      `mapstructure:"public_ssh_port"`
 	SecurityGroups         []string `mapstructure:"security_groups"`
 	ServiceOffering        string   `mapstructure:"service_offering"`
 	PreventFirewallChanges bool     `mapstructure:"prevent_firewall_changes"`

builder/cloudstack/step_configure_networking.go

@@ -31,9 +31,13 @@ func (s *stepSetupNetworking) Run(_ context.Context, state multistep.StateBag) m
 		return multistep.ActionContinue
 	}
 
-	// Generate a random public port used to configure our port forward.
-	rand.Seed(time.Now().UnixNano())
-	s.publicPort = 50000 + rand.Intn(10000)
+	if config.PublicSSHPort != 0 {
+		s.publicPort = config.PublicSSHPort
+	} else {
+		// Generate a random public port used to configure our port forward.
+		rand.Seed(time.Now().UnixNano())
+		s.publicPort = 50000 + rand.Intn(10000)
+	}
 	state.Put("commPort", s.publicPort)
 
 	// Set the currently configured port to be the private port.

website/source/docs/builders/cloudstack.html.md

@@ -126,6 +126,10 @@ builder.
     connecting any provisioners to. If not provided, a temporary public IP
     address will be associated and released during the Packer run.
 
+-   `public_ssh_port` (number) - The fixed port you want to configure in the port
+    forwarding rule. Set this attribute if you do not want to use the a random
+    public port.
+
 -   `security_groups` (array of strings) - A list of security group IDs or names
     to associate the instance with.