Ruby on Rails

We have a rails application that's been running on an old version of Rehat 4.

We have to move it to Redhat 7

It was

apache 2.2.4, ruby 1.8.7, rails 2.3.8, passenger 2.2.5

and we're expected to migrate to

apache 2.4.27, ruby 2.51, rails 5.2.1 and passenger 5.3.4

This application used gems like

search logic
will_paginate
composite_primary_keys

to name a few.

…..

Are there any migration guides that highlight the complexity involved?

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