Question

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Why does Ruby on Rails use 0.0.0.0:3000 instead of localhost:3000?

I am starting my server locally and for some reason I am noticing this line there:

=> Rails 3.1.3 application starting in development on http://0.0.0.0:3000

Is that normal? My /etc/hosts file:

127.0.0.1       localhost
255.255.255.255 broadcasthost
::1             localhost
fe80::1%lo0     localhost

127.0.0.1       app.cmply.local
127.0.0.1       api.cmply.local
127.0.0.1       m.cmply.local

But I had just experimented with taking out the first line there. Could that have caused the problem? I put the first line back, but the server still says http://0.0.0.0

Any idea why that might be happening?

Answer 1

0.0.0.0 means that it’s listening on all interfaces; in other words, anybody who knows your IP address can access your Rails application. This is normal.