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We are load balancing 2 servers hosting an identical Craft environment.
When clicking around in the admin a user will get logged out after 30 seconds and sometimes even faster when browsing in the admin panel.
I am unable to set the load balancer to sticky sessions due to the load balancer sitting behind a Firewall which NAT's inbound traffic. So the load balancer see's all inbound traffic as a single IP.
Is there anything else that can be done to resolve this issue?
If you can't enforce sticky sessions, then you'll need to provide a common place for all load balanced web server to save their PHP session files.
By default PHP session files are file based and saved to whatever path the php.ini session_save_path is set to. You could change that to an NFS share path.
If you had an in-memory key=>value store (like Redis, Memcached, etc.) you could configure PHP to save its sessions there.
If you wanted something more persistent, you could configure PHP to save sessions in a database.
On top of that, if you're not using stick sessions, you'd want to set a consistent appId and validationKey across every web server so they can decrypt Craft/PHP cookies using the same tokens.
session.save_handler and session.save_path. Similar to examples here digitalocean.com/community/tutorials/…
Jul 26 '17 at 18:10