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Document workaround for slow JRuby installation on GCE #743

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Mar 1, 2017
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Document workaround for slow JRuby installation on GCE #743

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22 changes: 22 additions & 0 deletions user/languages/ruby.md
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Expand Up @@ -104,6 +104,28 @@ JRuby into account. Most of popular C extensions these days also have Java
implementations (json gem, nokogiri, eventmachine, bson gem) or Java
alternatives (like JDBC-based drivers for MySQL, PostgreSQL and so on).

### JRuby: Installation takes a long time on Standard and Trusty environments

In the [Standard and Trusty
environments](https://docs.travis-ci.com/user/ci-environment/#Virtualization-environments),
installing JRuby can take several minutes.
This is due to the lack of entropy in the build VM, which can be
eradicated by installing an entropy daemon such as
[HAVEGED](http://www.issihosts.com/haveged/).

You can use [the `apt`
addon](https://docs.travis-ci.com/user/installing-dependencies#Installing-Packages-with-the-APT-Addon)
as follows:

language: ruby
rvm: jruby-9.1.5.0
sudo: required
dist: trusty
addons:
apt:
packages:
- haveged

## Default Test Script

Travis CI runs `rake` by default to execute your tests. Please note that **you
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