As as a back-end developer I always interact with the servers by using different tools in order visualize on going and failed processes by checking logs also debugging etc , when its comes to NodeJs PM2 it common tool to be used
One day I was working on server and I was changing only environment variable as to make change to reflect I restarted an app by running command
PM2 restart <App name>
It fails to restart due to error of missing some environment variable , I was looking fast way around to start again an app again I took some time for fixing by adding those missing variable but I was not luck at all
Then thanks to my team leader remind me to use
And the app starts running :)
PM2 is node daemon process management that comes with load balancer (improves application availability and responsiveness and prevents server overload).
PM2 offers a simple CLI tool and is installed via NPM , and bunch of command to be used on starting, stoping, restarting, checking logs and more
What PM2 resurrect does it to restore previously saved process list
PM2 process list are saved with command below
PM2 save takes a snapshot of your currently running Node applications, This saves the processes currently managed by PM2 to disk so they're accessible to the daemon on system boot.
Running PM2 contains environment(process.env) variable on heap (The heap is the RAM used by the program you're asking PM2 to manage and monitor), saving command will save all instances variables
you can see what memory usage by this command.
This means incase something went wrong resurrect can be used to revert running instances with no issue
pm2 offer run multiple processes with multiple cores of CPU to achieve the Load Balancer like effect
Can easy used on CI/CD deployment
Schedule to restart periodically
pm2 help to organise log
Allows auto-restart under specific conditions, such as ‘up-time’, ‘memory usage’
It provides much information, including restarting number, CPU usage, memory usage, process_id etc.
A simple CLI tool for ensuring that a given script runs continuously (i.e. forever)
Supervisor process control system for UNIX
You can add comment below on the issue you faced on servers