Update gemfile to require rack > 2.0

[OpenNebulaProject]

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Author Name: Ruben S. Montero (@rsmontero)
Original Redmine Issue: 5244, https://dev.opennebula.org/issues/5244
Original Date: 2017-07-13
Original Assignee: Abel Coronado

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None

[OpenNebulaProject]

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Original Redmine Comment
Author Name: Ruben S. Montero (@rsmontero)
Original Date: 2017-07-13T14:58:25Z

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Support for rack 1 should be preserved

[OpenNebulaProject]

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Original Redmine Comment
Author Name: Abel Coronado (Abel Coronado)
Original Date: 2017-09-05T14:07:54Z

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if RUBY_VERSION < '2.4.0'
    gem 'rack', '< 2.0.0'
else
    gem 'rack', '> 2.0.0'
end

[rsmontero]

Should we add a note on compatibility guide to run install-gems after the upgrade?

[vholer]

Should we add a note on compatibility guide to run install-gems after the upgrade?

Step with install_gems is part of all deployment procedures (fresh new installs or upgrade). I don't think it's necessary to specify it explicitly in the compatibility, but we may tell the Debian* packages are now in conflict with following packages:

• thin
• ruby-rack
• ruby-rack-protection
• ruby-sinatra

This is something good to know before upgrade. I'll update the docs...

[vholer]

Fixed in OpenNebula/docs#484. Closing.