How can ruby ​​gems be used offline?

Question

Ruby on Rails

Need information on installing and using Ruby/Rails latest (penultimate) versions offline.
All development will be carried out behind an offline computer (Ubuntu Linux / Windows). Internet access for downloading gems is on another computer, for which there is no possibility to develop.
I would like to know how you can install gems offline and add them to your project on a machine not connected to the network.
Any information on working with Ruby/Rails offline will also be useful.

Answer 1

For bundler
bundler.io/v1.13/man/bundle-package.1.html
Also, make sure you have all the necessary dependencies installed on your dev machine to build popular gems like pg/mysql2, imagemagick, etc.