Bundler

Bundler is a tool that makes it easier to keep track of what Ruby gems (and what versions of those gems) an application depends upon

Rvm

RVM (Ruby Version Manager) is a command line tool which allows users to install, manage and work with multiple Ruby environments from interpreters to sets of gems easily in the various Unix-like systems (such as Linux and Mac OS X).



Familiar process gem

Example

"In the case of rvm which i m more familiar with the process would be to capture a list of currently installed gems such as the output of gem list and transform that into a gemfile that bundler can use to reinstall bundler"

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How should I upgrade an old version of Ruby Enterprise Edition?

"Rvm supports more then just .rvmrc one of this files is gemfile with either the bundler directive to specify ruby"

from question  

Why is rvm changing paths without an rvmrc?

Others

Example

You could uninstall the newer version s of bundler though this is a crappy way to deal with the issue or since you re using rvm just create a gemset for rails 3.0.1;note this requires that bundler not be in your global gemset for the ruby version you re trying to use

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Unable to activate rails 3.0.1 because of bundler version conflict

I hope you ve got rvm if not i strongly sugget you to install it this will allow you not only to use different versions of ruby but also to set different gemsets therefor one each project you ll find it useful;once in rails 3 you can use bundler have a look at this episode of railscasts by the way this is a very good site but you may know it already

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Rails Server Command

Bundler is a better way to manage application dependencies. there is a plugin rbenv-gemset for getting the same results as rvm s gemsets but sam clearly favors using bundler instead

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Rbenv: Surviving without gemsets

Rvm is really more for personal use;for a system service i would just install the version of ruby you want someplace that doesn t conflict with the system version like usr local and use bundler in deployment mode to get the gemset

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How to make upstart work gracefully with RVM?

In contrast with rvm rbenv does not manage gemsets;bundler is a better way to manage application dependencies

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"rails new project_name" for 3.0 and 3.1 using rbenv

Rvm is more like a containment unit;while bundler is like a manifest dependency manager of what the application will require or use in it s lifecycle among other things

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What does Bundler offer over RVM?

Interestingly when i log into the server i see that rvm has installed ruby 2.4.1 after taking a closer look at mina s output i see warning the running version of bundler is older than the version that created the lockfile

from question  

Mina: Can't deploy anymore: RVM with current Ruby is installed on server, but too old ruby version is used while deploying

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