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Quick Linux Port Redirect Tip

A lot of the time when I am deploying applications on Railo, you get the installer, and install a version of tomcat (for example) and then setup Railo and then finally install Apache or NGinx.

This has been working well for a while but what if you dont want that extra webserver layer? There are times where I don't see the point of setting up Apache since all it will be doing (in my case) is proxying from port 80 to port 8080.

There are a couple of things you can do:

  1. Try and change the port in tomcat by editing server.xml
  2. Use iptables to redirect the port without having to install anything else!

 

Recently I got into a Yak Shaving situation where having changed the port of Tomcat to port 80, meant that I need to change the user that Tomcat was going under (and I didn't want to do that!) so meant I had to do a bunch of other stuff and essentially meant that the only way out would be to install a web server. Which seemed overkill for the app (well, service) I wanted to deploy.

IPTABLES to the rescue!

After a quick trawl around the internet I found the solution, which was just to put some redirects in iptables.

sudo iptables -t nat -I PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8080

sudo iptables -t nat -I OUTPUT -p tcp --dport 80 -j REDIRECT --to-ports 8080

This achieves the goal I was looking for without the need to configure yet another service (that will need restarting when we do other changes etc)

What do you think? Useful?

Introducing my new company: CMD

Hello Internet! It gives me great pleasure to announce the start of my new company: CMD

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