How to install gem across all gemsets when using RVM

Question

Is there a way to install a gem across all rubies and gemsets (not just the default or the system ruby) in the system when using RVM?

Answer 1

You can execute:

rvm @global do gem install [gem_name]

to install gem globally (per ruby version).

It is not possible to install gem globally for every ruby version.

According to https://rvm.io/gemsets/initial you can define automatically installed gems for every ruby version in file ~/.rvm/gemsets/global.gems. In this file you need to define required gems (one per line) e.g.

bundler
zeus

These gems will be installed each time you add new ruby version to the RVM.

Answer 2

You can install to a default, global gemset per ruby interpreter as mentioned here:

https://rvm.io/gemsets/global/

and also this page mentions default gem sets

https://rvm.io/gemsets/using/

And it wouldn't be useful to install a gem to all ruby interpreters due to incompatibilities between rubies.