How to install and configure node js and PM2 in rhel7

OS RHEL7.6 Minimal Install

Download :  libuv-1.7.5-3.el7.x86_64.rpm , nodejs-4.7.2-1.el7.x86_64.rpm

[root@node1 ~]# rpm -ivh nodejs-4.7.2-1.el7.x86_64.rpm
warning: nodejs-4.7.2-1.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
error: Failed dependencies:
libuv >= 1:1.7.5 is needed by nodejs-4.7.2-1.el7.x86_64
libuv.so.1()(64bit) is needed by nodejs-4.7.2-1.el7.x86_64

[root@node1 ~]# rpm -ivh libuv-1.7.5-3.el7.x86_64.rpm
warning: libuv-1.7.5-3.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:libuv-1:1.7.5-3.el7              ################################# [100%]

[root@node1 ~]# rpm -ivh nodejs-4.7.2-1.el7.x86_64.rpm
warning: nodejs-4.7.2-1.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:nodejs-4.7.2-1.el7               ################################# [100%]


You can verify if Node.js is installed by checking its version:

[root@node1 ~]# node -v
v4.7.2
[root@node1 ~]# npm  -v
2.15.11

Use Node.js Packaged Modules (NPM) to install PM2 on our app server. Npm is a package manager for installing Node.js modules.

[root@node1 ~]# npm install pm2 -g
npm WARN optional dep failed, continuing fsevents@1.2.7
npm WARN engine proxy-agent@3.0.3: wanted: {"node":">=6"} (current: {"node":"4.7.2","npm":"2.15.11"})
npm WARN engine socks-proxy-agent@4.0.1: wanted: {"node":">= 6"} (current: {"node":"4.7.2","npm":"2.15.11"})
npm WARN engine socks@2.2.3: wanted: {"node":">= 6.0.0","npm":">= 3.0.0"} (current: {"node":"4.7.2","npm":"2.15.11"})
npm WARN engine readable-stream@3.1.1: wanted: {"node":">= 6"} (current: {"node":"4.7.2","npm":"2.15.11"})
npm WARN engine smart-buffer@4.0.2: wanted: {"node":">= 4.0.0","npm":">= 3.0.0"} (current: {"node":"4.7.2","npm":"2.15.11"})
/usr/bin/pm2 -> /usr/lib/node_modules/pm2/bin/pm2
/usr/bin/pm2-dev -> /usr/lib/node_modules/pm2/bin/pm2-dev
/usr/bin/pm2-docker -> /usr/lib/node_modules/pm2/bin/pm2-docker
/usr/bin/pm2-runtime -> /usr/lib/node_modules/pm2/bin/pm2-runtime
pm2@3.3.1 /usr/lib/node_modules/pm2
├── gkt@1.0.0
├── v8-compile-cache@2.0.2
├── commander@2.15.1
├── eventemitter2@5.0.1
├── semver@5.6.0
├── pm2-axon-rpc@0.5.1
├── fclone@1.0.11
├── sprintf-js@1.1.1
├── debug@3.2.6 (ms@2.1.1)
├── pidusage@2.0.17 (safe-buffer@5.1.2)
├── pm2-deploy@0.4.0 (tv4@1.3.0)
├── pm2-multimeter@0.1.2 (charm@0.1.2)
├── promptly@2.2.0 (read@1.0.7)
├── pm2-axon@3.3.0 (amp-message@0.1.2, escape-regexp@0.0.1, amp@0.3.1)
├── mkdirp@0.5.1 (minimist@0.0.8)
├── source-map-support@0.5.10 (buffer-from@1.1.1, source-map@0.6.1)
├── nssocket@0.6.0 (eventemitter2@0.4.14, lazy@1.0.11)
├── cli-table-redemption@1.0.1 (chalk@1.1.3)
├── chalk@2.4.2 (escape-string-regexp@1.0.5, supports-color@5.5.0, ansi-styles@3.2.1)
├── @pm2/agent@0.5.23 (ws@5.2.2)
├── blessed@0.1.81
├── cron@1.6.0 (moment-timezone@0.5.23)
├── needle@2.2.4 (sax@1.2.4, debug@2.6.9, iconv-lite@0.4.24)
├── yamljs@0.3.0 (glob@7.1.3, argparse@1.0.10)
├── @pm2/js-api@0.5.49 (eventemitter2@4.1.2, debug@2.6.9, ws@3.3.3, axios@0.16.2)
├── chokidar@2.1.2 (normalize-path@3.0.0, path-is-absolute@1.0.1, async-each@1.0.1, inherits@2.0.3, upath@1.1.0, is-glob@4.0.0, is-binary-path@1.0.1, glob-parent@3.1.0, braces@2.3.2, readdirp@2.2.1, anymatch@2.0.0)
├── shelljs@0.8.3 (interpret@1.2.0, glob@7.1.3, rechoir@0.6.2)
├── moment@2.24.0
├── @pm2/io@3.1.1 (event-loop-inspector@1.2.2, signal-exit@3.0.2, semver@5.5.0, shimmer@1.2.1, tslib@1.9.3, debug@3.1.0, @pm2/legacy-tracing@1.4.2, @pm2/agent-node@1.1.6)
├── vizion@2.0.2 (lodash.foreach@4.5.0, ini@1.3.5, lodash.last@3.0.0, lodash.get@4.4.2, lodash.findindex@4.6.0, git-node-fs@1.0.0, js-git@0.7.8, async@2.6.1)
├── date-fns@1.30.1
└── async@2.6.2 (lodash@4.17.11)

Create and edit your Node.js application. In our example, we will edit a sample application called hello.js.

[root@node1 ~]# vim hello.js

var http = require('http');
http.createServer(function (req, res){
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
}).listen(8080, 'APP_SERVER_PUBLIC_IP');
console.log('Server running at http://APP_SERVER_PUBLIC_IP_ADDRESS:8080/');

Test your application on your app server:

[root@node1 ~]# node hello.js

Start the application with PM2 so that it runs in the background:

[root@node1 ~]# pm2 start hello.js

If you wish to stop an application, you can use the stop command. Make sure to specify the PM2 Id or App name.

[root@node1 ~]# pm2 stop App or ID

Restart the application. Be sure to indicate the app name or ID.

[root@node1 ~]# pm2 restart App or ID

YList the applications currently managed by PM2:

[root@node1 ~]# pm2 list

By using the info subcommand, you can find more information about a specific application. 
Make sure you specify the PM2 id or App name in place of the highlighted portion:

[root@node1 ~]# pm2 info App or ID

Install NGINX:

[root@node1 ~]# vim /etc/yum.repos.d/yum.repo
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/mainline/rhel/7/$basearch/
gpgcheck=0
enabled=1

[root@node1 ~]# yum install nginx
[root@node1 ~]# cp /etc/nginx/conf.d/default.conf /etc/nginx/conf.d/default.conf_ORG
[root@node1 ~]# mv /etc/nginx/conf.d/default.conf /etc/nginx/conf.d/a.conf

NGINX location block after edit:

[root@node1 ~]# vim /etc/nginx/conf.d/a.conf
server {
    listen       80;
    server_name  node1.example.com;

     location / {
     proxy_pass http://192.168.122.50:8080;
     proxy_http_version 1.1;
     proxy_set_header Upgrade $http_upgrade;
     proxy_set_header Connection 'upgrade';
     proxy_set_header Host $host;
     proxy_cache_bypass $http_upgrade;
     }
   
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }

}

Restart NGINX on your Web server:

[root@node1 ~]# service nginx restart