PM2 simple use and daemon

Preface ： This tutorial uses centos8 As an example , Other systems can be replaced by themselves .

One 、 install

1. install nodejs

yum install nodejs

2. install pm2

cd /root && npm install pm2 -g

3. Check for successful installation

pm2 list

Two 、 Use

1. A daemon / Script

pm2 start  Your program name 

2. The guardian thread / process

pm2 start ' Your progress / Threads '

3. Boot from boot
After all the guards are finished, you can run it automatically if you want to turn it on , After all, it's still troublesome to start one by one .

pm2 ps   ## Check whether the list you are guarding is correct 

4. Stop those who don't want to start up automatically

pm2 stop  Your program /' process '

5. Save the services enabled in the current list

pm2 save

6. Add the service that has just been started in the keep list to the startup self startup

sudo pm2 startup

7. How to delete startup （ You cannot delete an item alone ）

pm2 unstartup systemd

3、 ... and 、 Troubleshooting

1. Check whether it is administrator mode , If it is not ：

su -root

2. Update instruction Library

yum update

3. uninstall

yum remove nodejs -y

Four 、 other

upgrade pm2

pm2 update

5、 ... and 、 Cluster mode （ Limited to Node.js）

pm2 start app.js -i 4         ##  Start in cluster mode 4 Application instances , It will load balance each application's network queries 
pm2 reload all                ## Zero second shutdown and restart 
pm2 scale [app-name] 10       ## Scale clustering is applied to 10 A process 
## Process monitoring 
pm2 list                      ## List PM2 All processes 
pm2 monit                     ## Displays the memory of each application and cpu usage 
pm2 show [app-name]           ## Show all the information about the application 
## Log management 
pm2 logs                      ## Show logs for all applications 
pm2 logs [app-name]           ## Show logs for a specific application 
pm2 logs --json               ## journal JSON format 
pm2 flush
pm2 reloadLogs
## Process status management 
pm2 start app.js --name="233" ## Start the application and name it “233”
pm2 start app.js -- -a 343     ## Start applying and passing options “-a 343” As a parameter 
pm2 start app.js --watch      ## Restart the file change application 
pm2 start script.sh           ## start-up bash Type scripts 
pm2 start app.json            ## Start at app.json All applications declared in 
pm2 reset [app-name]          ## Reset all counters 
pm2 stop all                  ## Stop all applications 
pm2 stop 456                  ## Stop the process id by 456 Applications for 
pm2 restart all               ## Restart all applications 
pm2 gracefulReload all        ## Reload all applications normally in cluster mode 
pm2 delete all                ## Kill and delete all applications 
pm2 delete 114                  ## Delete process id by 114 Applications for 
## start-up / Guide management 
pm2 resurrect                 ## Restore the previously saved process 
pm2 unstartup                 ## Disable and delete the boot system 
pm2 update                    ## Save process , Kill PM2 And resume the process 
pm2 generate                  ## Generate an example json The configuration file