create react app with express on azure app service fails to start-CodePudding

I have deployed to azure a create-react-app that has a server.js file for dynamically generating meta tags.

The stack is Node 16 on Linux

In my startup command I have pm2 start /home/site/wwwroot/server.js --no-daemon

My server.js is as follows

const express = require("express");
const path = require("path");
const fs = require("fs");

const PORT = process.env.PORT || 5000;

const app = express();

app.get("/", (req, res) => {
  const filePath = path.resolve(__dirname, "index.html");
  fs.readFile(filePath, "utf8", (err, data) => {
    if (err) {
      return console.log(err);
    }

    data = data.replace(/__META_OG_TITLE__/g, "Home Page").replace(/__META_DESCRIPTION__/g, "Home page description.");

    res.send(data);
  });
});

app.get("/snp/list", (req, res) => {
  const filePath = path.resolve(__dirname, "index.html");
  fs.readFile(filePath, "utf8", (err, data) => {
    if (err) {
      return console.log(err);
    }

    data = data.replace(/__META_OG_TITLE__/g, "SNP List").replace(/__META_DESCRIPTION__/g, "SNP List description.");

    res.send(data);
  });
});

app.get("/snp/detail", (req, res) => {
  const filePath = path.resolve(__dirname, "index.html");
  fs.readFile(filePath, "utf8", (err, data) => {
    if (err) {
      return console.log(err);
    }

    data = data.replace(/__META_OG_TITLE__/g, "SNP Detail").replace(/__META_DESCRIPTION__/g, "SNP detail description.");

    res.send(data);
  });
});

app.use(express.static(path.resolve(__dirname)));

app.listen(PORT, () => {
  console.log(`Server is listening on port ${PORT}`);
});

This server.js is a sibling of the index.html.

I'm getting a Cannot find module 'express' error and this is my error log dump

 2022-02-23T22:12:16.154879649Z NodeJS Version : v16.6.1
2022-02-23T22:12:16.154883449Z Note: Any data outside '/home' is not persisted
2022-02-23T22:12:16.154887149Z 
2022-02-23T22:12:16.491995689Z Cound not find build manifest file at '/home/site/wwwroot/oryx-manifest.toml'
2022-02-23T22:12:16.492031589Z Could not find operation ID in manifest. Generating an operation id...
2022-02-23T22:12:16.492036389Z Build Operation ID: 8e9bf4f8-2b72-4d38-ad94-8e3461d1caed
2022-02-23T22:12:17.563270289Z Environment Variables for Application Insight's IPA Codeless Configuration exists..
2022-02-23T22:12:17.626540290Z Writing output script to '/opt/startup/startup.sh'
2022-02-23T22:12:17.864719008Z Running #!/bin/sh
2022-02-23T22:12:17.865929003Z 
2022-02-23T22:12:17.865970803Z # Enter the source directory to make sure the script runs where the user expects
2022-02-23T22:12:17.866221302Z cd "/home/site/wwwroot"
2022-02-23T22:12:17.866787300Z 
2022-02-23T22:12:17.866803800Z export NODE_PATH=/usr/local/lib/node_modules:$NODE_PATH
2022-02-23T22:12:17.866809300Z if [ -z "$PORT" ]; then
2022-02-23T22:12:17.867117999Z      export PORT=8080
2022-02-23T22:12:17.867133499Z fi
2022-02-23T22:12:17.867138499Z 
2022-02-23T22:12:17.868571094Z PATH="$PATH:/home/site/wwwroot" pm2 start /home/site/wwwroot/server.js --no-daemon
2022-02-23T22:12:18.222455804Z 
2022-02-23T22:12:18.222498404Z                         -------------
2022-02-23T22:12:18.222506204Z 
2022-02-23T22:12:18.222510804Z __/\\\\\\\\\\\\\____/\\\\____________/\\\\____/\\\\\\\\\_____
2022-02-23T22:12:18.222516104Z  _\/\\\/////////\\\_\/\\\\\\________/\\\\\\__/\\\///////\\\___
2022-02-23T22:12:18.222521604Z   _\/\\\_______\/\\\_\/\\\//\\\____/\\\//\\\_\///______\//\\\__
2022-02-23T22:12:18.222526904Z    _\/\\\\\\\\\\\\\/__\/\\\\///\\\/\\\/_\/\\\___________/\\\/___
2022-02-23T22:12:18.222533104Z     _\/\\\/////////____\/\\\__\///\\\/___\/\\\________/\\\//_____
2022-02-23T22:12:18.222550803Z      _\/\\\_____________\/\\\____\///_____\/\\\_____/\\\//________
2022-02-23T22:12:18.222555903Z       _\/\\\_____________\/\\\_____________\/\\\___/\\\/___________
2022-02-23T22:12:18.222560103Z        _\/\\\_____________\/\\\_____________\/\\\__/\\\\\\\\\\\\\\\_
2022-02-23T22:12:18.222564603Z         _\///______________\///______________\///__\///////////////__
2022-02-23T22:12:18.222568703Z 
2022-02-23T22:12:18.222572503Z 
2022-02-23T22:12:18.222576203Z                           Runtime Edition
2022-02-23T22:12:18.222580003Z 
2022-02-23T22:12:18.222583703Z         PM2 is a Production Process Manager for Node.js applications
2022-02-23T22:12:18.222587503Z                      with a built-in Load Balancer.
2022-02-23T22:12:18.222591303Z 
2022-02-23T22:12:18.222595103Z                 Start and Daemonize any application:
2022-02-23T22:12:18.222598903Z                 $ pm2 start app.js
2022-02-23T22:12:18.222602603Z 
2022-02-23T22:12:18.222606303Z                 Load Balance 4 instances of api.js:
2022-02-23T22:12:18.222610003Z                 $ pm2 start api.js -i 4
2022-02-23T22:12:18.222613803Z 
2022-02-23T22:12:18.222619703Z                 Monitor in production:
2022-02-23T22:12:18.222623703Z                 $ pm2 monitor
2022-02-23T22:12:18.222627503Z 
2022-02-23T22:12:18.222631203Z                 Make pm2 auto-boot at server restart:
2022-02-23T22:12:18.222635003Z                 $ pm2 startup
2022-02-23T22:12:18.222638703Z 
2022-02-23T22:12:18.222642403Z                 To go further checkout:
2022-02-23T22:12:18.222646103Z                 http://pm2.io/
2022-02-23T22:12:18.222649803Z 
2022-02-23T22:12:18.222653603Z 
2022-02-23T22:12:18.222657303Z                         -------------
2022-02-23T22:12:18.222661103Z 
2022-02-23T22:12:18.231376071Z pm2 launched in no-daemon mode (you can add DEBUG="*" env variable to get more messages)
2022-02-23T22:12:18.447267984Z 2022-02-23T22:12:18: PM2 log: Launching in no daemon mode
2022-02-23T22:12:18.481629859Z 2022-02-23T22:12:18: PM2 log: [PM2] Starting /home/site/wwwroot/server.js in fork_mode (1 instance)
2022-02-23T22:12:18.486247242Z 2022-02-23T22:12:18: PM2 log: App [server:0] starting in -fork mode-
2022-02-23T22:12:18.515573535Z 2022-02-23T22:12:18: PM2 log: App [server:0] online
2022-02-23T22:12:18.529572684Z 2022-02-23T22:12:18: PM2 log: [PM2] Done.
2022-02-23T22:12:18.632207310Z 2022-02-23T22:12:18: PM2 log: ┌─────┬───────────┬─────────────┬─────────┬─────────┬──────────┬────────┬──────┬───────────┬──────────┬──────────┬──────────┬──────────┐
2022-02-23T22:12:18.632269910Z │ id  │ name      │ namespace   │ version │ mode    │ pid      │ uptime │ ↺    │ status    │ cpu      │ mem      │ user     │ watching │
2022-02-23T22:12:18.632279110Z ├─────┼───────────┼─────────────┼─────────┼─────────┼──────────┼────────┼──────┼───────────┼──────────┼──────────┼──────────┼──────────┤
2022-02-23T22:12:18.632284510Z │ 0   │ server    │ default     │ N/A     │ fork    │ 39       │ 0s     │ 0    │ online    │ 0%       │ 30.6mb   │ root     │ disabled │
2022-02-23T22:12:18.632289010Z └─────┴───────────┴─────────────┴─────────┴─────────┴──────────┴────────┴──────┴───────────┴──────────┴──────────┴──────────┴──────────┘
2022-02-23T22:12:18.638526987Z 2022-02-23T22:12:18: PM2 log: [--no-daemon] Continue to stream logs
2022-02-23T22:12:18.639576183Z 2022-02-23T22:12:18: PM2 log: [--no-daemon] Exit on target PM2 exit pid=28
2022-02-23T22:12:18.763260232Z 2022-02-23T22:12:18: PM2 log: [PM2] This PM2 is not UP TO DATE
2022-02-23T22:12:18.766529521Z 2022-02-23T22:12:18: PM2 log: [PM2] Upgrade to version 5.2.0
2022-02-23T22:12:18.769252311Z 22:12:18 PM2      | [PM2] This PM2 is not UP TO DATE
2022-02-23T22:12:18.770937304Z 22:12:18 PM2      | [PM2] Upgrade to version 5.2.0
2022-02-23T22:12:18.789006939Z 22:12:18 0|server | Error: Cannot find module 'express'
2022-02-23T22:12:18.790186234Z 22:12:18 0|server | Require stack:
2022-02-23T22:12:18.791370430Z 22:12:18 0|server | - /home/site/wwwroot/server.js
2022-02-23T22:12:18.793005124Z 22:12:18 0|server |     at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
2022-02-23T22:12:18.794990917Z 22:12:18 0|server |     at Module.Hook._require.Module.require (/usr/local/lib/node_modules/pm2/node_modules/require-in-the-middle/index.js:61:29)
2022-02-23T22:12:18.799204201Z 22:12:18 0|server |     at require (node:internal/modules/cjs/helpers:94:18)
2022-02-23T22:12:18.800213398Z 22:12:18 0|server |     at Object.<anonymous> (/home/site/wwwroot/server.js:1:17)
2022-02-23T22:12:18.801263394Z 22:12:18 0|server |     at Module._compile (node:internal/modules/cjs/loader:1101:14)
2022-02-23T22:12:18.802277190Z 22:12:18 0|server |     at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
2022-02-23T22:12:18.803243187Z 22:12:18 0|server |     at Module.load (node:internal/modules/cjs/loader:981:32)
2022-02-23T22:12:18.804699981Z 22:12:18 0|server |     at Function.Module._load (node:internal/modules/cjs/loader:822:12)
2022-02-23T22:12:18.805678378Z 22:12:18 0|server |     at Object.<anonymous> (/usr/local/lib/node_modules/pm2/lib/ProcessContainerFork.js:33:23)
2022-02-23T22:12:18.806396875Z 22:12:18 0|server |     at Module._compile (node:internal/modules/cjs/loader:1101:14) {
2022-02-23T22:12:18.807571271Z 22:12:18 0|server |   code: 'MODULE_NOT_FOUND',
2022-02-23T22:12:18.807588071Z 22:12:18 0|server |   requireStack: [ '/home/site/wwwroot/server.js' ]
2022-02-23T22:12:18.810564360Z 22:12:18 0|server | }
2022-02-23T22:12:18.810584860Z 2022-02-23T22:12:18: PM2 log: App [server:0] exited with code [1] via signal [SIGINT]
2022-02-23T22:12:18.814429746Z 22:12:18 PM2      | App [server:0] exited with code [1] via signal [SIGINT]
2022-02-23T22:12:18.816066740Z 2022-02-23T22:12:18: PM2 log: App [server:0] starting in -fork mode-
2022-02-23T22:12:18.817591534Z 22:12:18 PM2      | App [server:0] starting in -fork mode-
2022-02-23T22:12:18.837398662Z 2022-02-23T22:12:18: PM2 log: App [server:0] online
2022-02-23T22:12:18.839963853Z 22:12:18 PM2      | App [server:0] online
2022-02-23T22:12:19.077033189Z 22:12:19 0|server | Error: Cannot find module 'express'
2022-02-23T22:12:19.078228284Z 22:12:19 0|server | Require stack:
2022-02-23T22:12:19.079877278Z 22:12:19 0|server | - /home/site/wwwroot/server.js
2022-02-23T22:12:19.081284973Z 22:12:19 0|server |     at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
2022-02-23T22:12:19.081781471Z 22:12:19 0|server |     at Module.Hook._require.Module.require (/usr/local/lib/node_modules/pm2/node_modules/require-in-the-middle/index.js:61:29)
2022-02-23T22:12:19.082940467Z 22:12:19 0|server |     at require (node:internal/modules/cjs/helpers:94:18)
2022-02-23T22:12:19.084115863Z 22:12:19 0|server |     at Object.<anonymous> (/home/site/wwwroot/server.js:1:17)
2022-02-23T22:12:19.085170459Z 22:12:19 0|server |     at Module._compile (node:internal/modules/cjs/loader:1101:14)
2022-02-23T22:12:19.086312955Z 22:12:19 0|server |     at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
2022-02-23T22:12:19.089914542Z 22:12:19 0|server |     at Module.load (node:internal/modules/cjs/loader:981:32)
2022-02-23T22:12:19.090947538Z 22:12:19 0|server |     at Function.Module._load (node:internal/modules/cjs/loader:822:12)
2022-02-23T22:12:19.091896934Z 22:12:19 0|server |     at Object.<anonymous> (/usr/local/lib/node_modules/pm2/lib/ProcessContainerFork.js:33:23)
2022-02-23T22:12:19.093072430Z 22:12:19 0|server |     at Module._compile (node:internal/modules/cjs/loader:1101:14) {
2022-02-23T22:12:19.096341718Z 22:12:19 0|server |   code: 'MODULE_NOT_FOUND',
2022-02-23T22:12:19.097369815Z 22:12:19 0|server |   requireStack: [ '/home/site/wwwroot/server.js' ]
2022-02-23T22:12:19.099276608Z 22:12:19 0|server | }
2022-02-23T22:12:19.100614503Z 2022-02-23T22:12:19: PM2 log: App [server:0] exited with code [1] via signal [SIGINT]
2022-02-23T22:12:19.104935187Z 22:12:19 PM2      | App [server:0] exited with code [1] via signal [SIGINT]
2022-02-23T22:12:19.106340982Z 2022-02-23T22:12:19: PM2 log: App [server:0] starting in -fork mode-
2022-02-23T22:12:19.107983276Z 22:12:19 PM2      | App [server:0] starting in -fork mode-
2022-02-23T22:12:19.122067624Z 2022-02-23T22:12:19: PM2 log: App [server:0] online
2022-02-23T22:12:19.124422816Z 22:12:19 PM2      | App [server:0] online
2022-02-23T22:12:19.342399121Z 22:12:19 0|server | Error: Cannot find module 'express'
2022-02-23T22:12:19.344263414Z 22:12:19 0|server | Require stack:
2022-02-23T22:12:19.346447807Z 22:12:19 0|server | - /home/site/wwwroot/server.js
2022-02-23T22:12:19.347436203Z 22:12:19 0|server |     at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
2022-02-23T22:12:19.351468388Z 22:12:19 0|server |     at Module.Hook._require.Module.require (/usr/local/lib/node_modules/pm2/node_modules/require-in-the-middle/index.js:61:29)
2022-02-23T22:12:19.352447085Z 22:12:19 0|server |     at require (node:internal/modules/cjs/helpers:94:18)
2022-02-23T22:12:19.353268082Z 22:12:19 0|server |     at Object.<anonymous> (/home/site/wwwroot/server.js:1:17)
2022-02-23T22:12:19.354038979Z 22:12:19 0|server |     at Module._compile (node:internal/modules/cjs/loader:1101:14)
2022-02-23T22:12:19.354565177Z 22:12:19 0|server |     at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
2022-02-23T22:12:19.355181375Z 22:12:19 0|server |     at Module.load (node:internal/modules/cjs/loader:981:32)
2022-02-23T22:12:19.356654469Z 22:12:19 0|server |     at Function.Module._load (node:internal/modules/cjs/loader:822:12)
2022-02-23T22:12:19.357570966Z 22:12:19 0|server |     at Object.<anonymous> (/usr/local/lib/node_modules/pm2/lib/ProcessContainerFork.js:33:23)
2022-02-23T22:12:19.360012257Z 22:12:19 0|server |     at Module._compile (node:internal/modules/cjs/loader:1101:14) {
2022-02-23T22:12:19.360040657Z 22:12:19 0|server |   code: 'MODULE_NOT_FOUND',
2022-02-23T22:12:19.360920954Z 22:12:19 0|server |   requireStack: [ '/home/site/wwwroot/server.js' ]
2022-02-23T22:12:19.362052350Z 22:12:19 0|server | }

If I switch the startup command to pm2 serve /home/site/wwwroot --no-daemon --spa then every things works just fine.

And, locally from the build folder if I issue a node server.js then again it works perfectly at http://localhost:5000/

I've spent the whole day trying to figure out what might be wrong and any help will be much appreciated.

EDIT

For now I am simply ftp'ing all the files from my build folder to site/wwwroot. I'm not worried at this point about setting up a CI/CD chain since I just first want the app to run.

The startup command is being set in the azure portal under settings/configuration/general settings/startup Command

EDIT-2 I installed pm2 via npm install pm2 -g locally on my machine and from the build folder if I issue the command pm2 start server.js then the app launches successfully.

My local node version is v14.5.0

CodePudding user response：

When you create production build for your React, Angular or other Node framework the files will either be placed in a build or dist directory(folder), depending on the framework.
App Service on Linux uses Oryx to detect, build, and start your application.
Using --spa will automatically redirect all queries to the index.html_

pm2 serve /home/site/wwwroot --no-daemon --spa

In order to serve the built content, you can perform either of the following:

PM2 Serve

If all of the items in the build directory are in wwwroot, change the path to /home/site/wwwroot.
```
pm2 serve /home/site/wwwroot/build --no-daemon    
```
If the content is under dist folder , make sure to use
```
pm2 serve /home/site/wwwroot/dist --no-daemon
```

Process File

Create a process.json or process.yml , place it in /home/site/wwwroot.

   {
     "script": "serve",
     "env": {
         "PM2_SERVE_PATH": './build'
     }
     "args": '--no-daemon'
     }

In the Azure Portal, go to Configuration.=> General and locate the Startup Command box and enter process.json =>Save.

Please refer Configure Node.js server , deploy React application in Azure App Service and Using PM2 on App Service Linux for more information

CodePudding user response：

The solution to the issue was staring at me in the face.

All I had to do was SSH to the home/site/wwwroot & npm install express.

Everything works perfectly with my meta tags getting dynamically generated.