How to run rails s -p80 on 80 port?

Question

By default,

 rails s #running on 3000 port 

Now I want to run it on port 80. So I tried:

 sudo rails -s -p80 

But it threw an error:

mlzboy@mlzboy-MacBook ~/my/b2c2 $ sudo rails s -p80 sudo: rails: command not found 

I used rvm to install ruby & rails. It seems rvm is user specified. Is it not able to find rails in root?

I also tried below code:

mlzboy@mlzboy-MacBook ~/my/b2c2 $ which rails /home/mlzboy/.rvm/gems/ruby-1.9.2-p0/bin/rails mlzboy@mlzboy-MacBook ~/my/b2c2 $ sudo /home/mlzboy/.rvm/gems/ruby-1.9.2-p0/bin/rails s -p80 

Answer 1

rvmsudo rails server -p 80 

Answer 2

Just forward the request from port 80 to 3000 using below command:

sudo iptables -t nat -I PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 3000 

Another option is:

rvmsudo rails server -p 80 

However please remember to free this port from Apache or other services which consume this port normally. Also, I m not sure giving sudo permission to RVM may have any security issue or not?