First acquaintance of pm2

First acquaintance of pm2

• effect:
  • The role of pm2 is the application process management of node, which can simplify the operation management of node (such as monitoring, restarting services, etc.)

Create file directory

• mkdir XX creates a file directory
• cd XX to enter the file

Install express start local service (start two express services)

• yarn add express -S

index service 1

• yarn add express -S
• npm init -y
• run command
  • node index.js

const express = require('express')

const app = express()

app.get('/index', (req, res) => {
    
    
  res.json({
    
    
    data: [11]
  })
})
app.listen(9999, () => {
    
    
  console.log("success server index2 http://localhost:9999/index");
})

index2 service 2

• yarn add express -S
• npm init -y
• run command
  • node index2.js

const express = require("express")

const app = express()

app.get('/index2', (req, res) => {
    
    
  res.json({
    
    
    data: [111, 222]
  })
})

app.listen(8888, () => {
    
    
  console.log("success server index2 http://localhost:8888/index2");

})
// 开一个服务 端口为3333

+effect

pm2 installation

• Install
  • npm i pm2 -g
• View installation
  • pm2 -v
  • Display the version number successfully

Basic commands for pm2

run node with pm2

• pm2 start app.js
• Note: app/app.js
  

Use pm2 logs to view the started node services

• pm2 logs
• Effect
  

pm2 list to view the enabled services

• pm2 list
• Effect
  

pm2 stop id (0 or 1, etc.) shuts down the service

• pm2 stop 0
• Effect
  

pm2 restart id restarts the service

• pm2 restart 0
• Effect
  

pm2 start index --watch to monitor node services in real time

• pm2 start index --watch
• Effect
  • That is, when you modify the data returned by node, you do not need to restart the service, just refresh the browser.

stop all services pm2 stop all

• pm2 stop all

delete service order

• pm2 delete app_name | app_iddelete a service
• pm2 delete alldelete all