Termios in RoR

Hi there

I'm trying to deploy my first RoR application in a little domestic
server. I'm following the Agile Web Development with Rails book chapter
#27 (Deployment and Production) and I'm experiencing problems installing
the required software.

I understand what I have to do, which is what this book recomends, and
I'm trying to install all the software in my server, but I don't know
what the termios mission in this scenario. Can anybody help me?

Thanks in advance

Best regards