What is the purpose of "pm2 save"?

Question

I am using pm2 to manage my node.js processes. Very happy with it so far.

What is the purpose of $ pm2 save? What is the purpose of saving a process list? I don't quite understand from the documentation. https://github.com/Unitech/pm2

Froemming

Doing this will save the process list with their current environment into the dump file $PM2_HOME/.pm2/dump.pm2 – Ritualize

Answer 1

pm2 save takes a snapshot of your currently running Node applications. You can then restore these applications using pm2 resurrect.

This is useful because it means you don't have to manually restart each application when you restart pm2 (such as a machine reboot). Instead, you can just have a script that calls pm2 resurrect and it'll start up all the Node apps.

pm2 resurrect is useful to be called manually. If you want your processes to automatically start on boot, you should create a startup script with pm2 startup.

Thinkable

Note pm2 resurrect is useful to be called manually. If you want your processes to automatically start on boot, you should create a startup script with pm2 startup. More info here: pm2.keymetrics.io/docs/usage/startup – Excruciation

if we have multiple application running. Do you know in what order after running resurrect? I have not been able to find out in any documentation – Scofield

save is hidden behind dump if you are looking for it in the help – Lansquenet

The term "snapshot" is misleading and makes you overthink on what it does. PM2 simply describes it as "save the app list". – Maybellmaybelle

Note: pm2 save dumps the list of running apps to ~/pm2/dump.pm2, and the script generated by pm2 startup uses it to run the apps when the server is rebooted. – Cristincristina

pm2 startup is usefull, but what if my user is NOT a SUDO and I do not want the sudo to uses pm2 at all. I havve a dedicated user for these jobs, but seemingly if I execute the sscript provided by the command (without the SUDO part), it just repeats itself. IDK if it actually made it work or not – Bottommost

Answer 2

$ pm2 save is used to save the pm2 process list to relaunch them after a server reboot. It comes generaly with :

pm2 startup which generates Startup Script

Receptacle