Historical errata for Deploying with JRuby 9k

“It runs processes in isolated environments without the need for a complete visualization layer for each process.”

“visualization” should be “virtualization”

“This has many of the same benefits as traditional visualization but with a very different underlying implementation.”

“visualization” should read “virtualization”

“In traditional visualization, a host operating system runs a hypervisor that manages one or more complete guest operating systems.”

“visualization” should read “virtualization”

Code sample:
ENV RACK_ENV development
ENV MAX_PUMA_THREADS 8

Text:
The first line sets the Rack environment to production, …

The code’s first line sets the Rack environment to development, not production.

“The default session storage mechanism in Rails is cookie based, which means the session state is stored on the client machine. This is an ideal place to put sensitive information, and it has a limited storage capacity.”

The second sentence should read “this is not an ideal place to put sensitive information”.

After adding the final piece to the Dockerfile the statement “The first line sets the Rack environment to production” is incorrect because the configuration example sets the value to development.

“In the past, preparing an app for JRuby required a number of library and code changes because many gems and commands such as Kerenel#exec couldn’t be used reliably.”

“Kerenel#exec” should be “Kernel#exec”

The endpoint download.finance.yahoo.com is no longer working and that is making the code to raise exceptions and it is not possible to complete the first chapter of the book due this problem.