How do I keep login sessions of Indico on 2 servers?

I am using Indico 2.2.8.

I run Indico on a Active/Backup cluster servers.
When Active goes down, Backup become to Active and serves Indico.

I faced that Active goes down, the login users are logouted all of them.
How do I keep login sessions of Indico between Active and Backup ?

You need to use a shared Redis server between the two instances.

Thank you for your quick reply !!
You are GENIUS !!

It is resolved by changing Redis’s “dir” setting from local directory to shared directory.

I appreciate for your support, again and again !!