Symfony 5 book the fast track: Is redis necessary for installing guestbook

I am trying to launch the “guestbook” web app from the “Symfony 5: the fast track” book. I check that all is well installed by taping the following command: symfony book:check-requirements and all is ok. But when I launch the local web server and the guestbook web site with: symfony open:local I got the following error on my web page: Cannot find the “redis” extension nor the “predis/predis” package

Installation of redis is not mentioned in the book. I am on Mac Os X Mojave.

Any Idea?

Regards

Answer

You need to:

• install predis/predis package:

composer require predis/predis

• and update your .env.local:

REDIS_URL=redis://localhost:usedPort?timeout=5