# Prevent ruby installation **URL:** \ **Category:** Build Environment\ **Tags:** rails, ruby, docker\ **Created:** [October 24, 2016, 3:34pm UTC](https://discuss.circleci.com/t/prevent-ruby-installation/7619 "2016-10-24T15:34:37Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![blackjid](https://sea2.discourse-cdn.com/circleci/user_avatar/discuss.circleci.com/blackjid/32/1781_2.png) [@blackjid](https://discuss.circleci.com/u/blackjid)\ **Post date:** [October 24, 2016, 3:34pm UTC](https://discuss.circleci.com/t/prevent-ruby-installation/7619/1 "2016-10-24T15:34:37Z")
I have a ruby on rails project that has been detected as ruby but I don’t want ruby to gets installed in the container. I use docker to run my tests on a already ruby provisioned image so I don’t need CircleCI to install ruby at the begining of the build. thanks ---
**Author:** ![blackjid](https://sea2.discourse-cdn.com/circleci/user_avatar/discuss.circleci.com/blackjid/32/1781_2.png) [@blackjid](https://discuss.circleci.com/u/blackjid)\ **Post date:** [November 2, 2016, 7:17pm UTC](https://discuss.circleci.com/t/prevent-ruby-installation/7619/2 "2016-11-02T19:17:10Z")
Anybody knows? ---
**Author:** ![rzane](https://sea2.discourse-cdn.com/circleci/user_avatar/discuss.circleci.com/rzane/32/981_2.png) [@rzane](https://discuss.circleci.com/u/rzane)\ **Post date:** [February 9, 2017, 4:10pm UTC](https://discuss.circleci.com/t/prevent-ruby-installation/7619/3 "2017-02-09T16:10:28Z")
I think this is what you want: `echo 'export rvm_install_on_use_flag=0' >> /home/ubuntu/.rvmrc` [https://circleci.com/docs/language-ruby-on-rails/](https://circleci.com/docs/language-ruby-on-rails/) ---
**Author:** ![system](https://global.discourse-cdn.com/circleci/original/3X/5/1/511608acda8e85906e15909b57bd0a46c1dbe291.png) [@system](https://discuss.circleci.com/u/system)\ **Post date:** [June 18, 2018, 11:38am UTC](https://discuss.circleci.com/t/prevent-ruby-installation/7619/4 "2018-06-18T11:38:49Z")
Closed on June 18, 2018, 11:38am UTC