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I am trying to run multiple Node.js web servers locally on my machine.

Because the code I'm writing needs to reference a domain name I'd like to keep a convention of and point that to the non-port-80 service running from Node (technically I'm running one on Harp.js and one on Sails.js).

  • So should point to localhost:123
  • and should point to localhost:456

Is this possible? If so, how.

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closed as off-topic by Michael Hampton Jun 19 '15 at 11:53

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up vote 11 down vote accepted

From my understanding, it seems that you only use one local dev machine, means not connected to any network that provides a DNS.

If i am right, i would suggest to setup things like described below :

step 1 : Assign at least two IP address to your MAC OS (one per domain), let's say :

To setup the second IP you will have to add a second Ethernet Adapter (logical not physical).

Step 2 : As you don't have a DNS server, you could setup your /etc/hosts file, by adding :

Step 3 : Assign aliases to your loopback interface :

sudo ifconfig lo0 alias
sudo ifconfig lo0 alias

Step 4 : Setup ipfw to forward packets :

sudo ipfw add fwd,123 tcp from me to dst-port 80
sudo ipfw add fwd,456 tcp from me to dst-port 80

You are done !

Now :

enter image description here enter image description here

I've setup two Node.js web servers to test your case :

$ netstat -anp tcp | grep -E "123|456"
tcp4    0    0    *.*    LISTEN
tcp4    0    0    *.*    LISTEN

Important : note that ipfw rules and loopback interface aliases are not persistent and will no longer exist after a reboot. So consider adding a startup script.

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Worked BEAUTIFULLY. This is EXACTLY what I wanted. – mondo Feb 10 '14 at 15:19
Glad it works ! i was pretty sure that it was not totally a "duplicate" ;) – krisFR Feb 10 '14 at 15:26

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