Running node.js code from Rails application

Question

I am trying to integrate some node.js code with my Rails application. Basically its a js file with some code that process will keep running in background.

I have followed the following steps:

Added code in root of rails app in some test_node.js file.
Now what I do is pass a value to my system using exec function of ruby, e.g exec "node test_node.js".
This works perfectly fine but it chop my server from processing any requests.
To pass it to background i tried using nohup e.g: exec "nohup node test_node.js".
When I run this code my server crashes.

I am Rails developer and never worked on node app so have no idea if I taking it right way or not.

What server? Did you used fork and exec? Can you rewrite test_node.js in ruby? — radubogdan
– radubogdan, Commented May 1, 2015 at 9:29
I am using Unicorn for my application, its not possible to rewrite test_node.js in Ruby. I tried using fork and exec it worked but as I checked in logs I feel it stopped server and forked it again. Will it work on production as well? — peeyush singla
– peeyush singla, Commented May 1, 2015 at 9:36

user49740 · Accepted Answer · 2015-05-01 09:50:00Z

4

exec replaces the currently running process with a new one. Thus, to run something in the background you should fork and exec in the child.

fork { exec('node', 'test_node.js', ...) }

nohup is not needed.

See also Ruby, Difference between exec, system and %x() or Backticks

answered May 1, 2015 at 9:50

user49740

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2 Comments

peeyush singla Over a year ago

awesome, is there some way to check the logs of these process?

user49740 Over a year ago

You can redirect stdout/stderr to a file right before the exec.

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