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I have a nodejs app running on server.
When should I use pm2 restart,and when should pm2 reload be used?
Referred to the pm2 documention here,but couldn't figure out the difference in use case of the two.
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PM2 allows to reload (auto fallback to restart if not in cluster) an application based on a memory limit/ Please note that the PM2 internal worker (which checks memory), starts every 30 seconds, so you may have to wait a bit before your process gets restarted automatically after reaching the memory threshold.
PM2 will keep your application forever alive, auto-restarting across crashes and machine restarts.
The start script sets up PM2 as a service under the init system. When the server restarts, it will automatically restart PM2, which will then restart all the Node. js applications/processes it is managing. In this article, we will show you how to deploy PM2 as a service to reliably manage your Node.
Yes, pm2 restart picks up local changes. Clients may have to clear cache/refresh if you're not seeing the changes.
The difference is documented here:
As opposed to
restart, which kills and restarts the process,reloadachieves a 0-second-downtime reload.
The latter means (found here):
With reload,
pm2restarts all processes one by one, always keeping at least one process running.
It also states that:
If the reload system hasn’t managed to reload your application, a timeout will fallback to a classic restart.
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