We build all of them by ourselves. We use rbbuild utility with mass-builder script on freshly installed systems. We use virtual machines with CentOS 7, Alma Linux 8 and 9 as a build nodes.

It's up to you. We use these binaries extensively in our infrastructure and have made the repository publicly available as a contribution to the open source community.

However, if you want, you can build your own binaries and create your very own repository. It's very easy. Use rbbuild to build the binaries, then pack them into tar.zst and use the rbinstall-gen utility to build the repository index.

We provide rbinstall-clone tool which can help you to clone any existing repository (e.g. ours) and use it as source of binaries. You can change the source of the binaries in the rbinstall configuration file (/etc/rbinstall.knf).

All versions of base Ruby include a statically linked version of the OpenSSL library. This means that if we want to update OpenSSL to the latest versions (due to bugs or CVEs), we have to recompile the binaries and update the tar.zst file with it.

We do not make any changes to the code base while building binaries. If it cannot be built on the system with the latest versions of dependencies, we simply skip it. We can't and won't make changes to the code base to try to make it work.

Sorry, no. We are limited by the operating systems used in our infrastructure. However, you can create your own repository of binaries for your distros.

By default, rbinstall installs two versions of the bundler gem - the latest 1.x version and the latest available version. The new version of bundler doesn't support old versions of Ruby, so if you want to use one, you have to define a compatible version in the configuration file, or install it manually.

For example, if you need to use Ruby 2.7, you can automatically install 1.x and 2.4.x by setting gems:install property in /etc/rbinstall.knf to this:

# List of gems to install on each Ruby version
  install: bundler=1 bundler=2.4

By default, rbinstall tries to install the latest compatible version of the RubyGems gem for the version you are currently installing. However, if you want to update the RubyGems gem to a custom version, you can specify it in the gems:rubygems-version property in the /etc/rbinstall.knf configuration file.