see

• http:https://www.sonatype.org/nexus/
• https://github.com/sonatype/nexus-oss/tree/nexus-2.11.x/plugins/rubygem for current nexus-ruby-plugin
• https://github.com/sonatype/nexus-ruby-support for older nexus releases (before version 2.11.0)

gem install nexus

gem nexus my.gem

then the command will prompt for the url, username and password. for further info on how to deploy to more then one repo, keep the credentials file on different file system location (like on an external device) or encrypt the credentials file altogether with password based encryption:

gem help nexus

prepare the dependencies

bundle install

run tests

bundle exec rake 

build and push gem to rubygems.org

gem build nexus.gemspec
gem push nexus-*.gem

install the gem into your local rubgems repository

gem install -l nexus-*.gem

1. fork it
2. create your feature branch (git checkout -b my-new-feature)
3. commit your changes (git commit -am 'Added some feature')
4. push to the branch (git push origin my-new-feature)
5. create new pull request

enjoy :)