How to create a technical page for a site on nodejs?

Question

JavaScript

There is a site that runs on nodejs, and which needs to be updated periodically. At the time of the update, I want to show visitors a technical page with relevant information. What is the easiest way to organize the switching of such a site to a technical mode. What are good practices?

Answer 1

Have you seen this mode on Google or Facebook?
Deploy the new version side by side and then switch upstream. Without downtime.

Answer 2

For good, there should be a proxy in front of the node. Here on it you can do balancing, switching between nodes or maintenance mode.

Answer 3

Use pm2 in cluster mode, not only will it re-raise dead processes, it will also solve your problem:
When you give a command pm2 restart app-name, it restarts processes in turn (1 extinguished, 1 started, 2 extinguished, 2 started, ...)
How result - we work without downtime