add pm2 process manager guide

nodeJS/PM2.md

@@ -0,0 +1,73 @@
+# PM2 Quick Start
+
+* Process Manager for Deployment of node js app
+* [Reference](https://pm2.keymetrics.io/docs/usage/quick-start/)
+* ![](./pm2-deploy.PNG)
+
+
+
+```sh
+# install pm2
+$ npm i pm2@latest -g
+
+# serve static site created by react
+# pm2 serve <build folder> <port> --spa
+$ pm2 serve build 8082 --spa 
+
+# to serve web app using "ecosystem.config.js"
+# serve at port 3001 (configured in index.js)
+$ pm2 start ecosystem.config.js
+
+# start app as daemon
+$ pm2 start server.js --name "wallet-api"
+
+$ pm2 list
+
+# stop process and start again
+$ pm2 restart
+
+# start new process, after started, stop old process
+$ pm2 reload
+
+$ pm2 logs
+
+$ pm2 stop
+
+$ pm2 delete all
+
+# terminal based monitoring dashboard
+$ pm2 monit
+```
+
+
+
+* [Ecosystem](https://pm2.keymetrics.io/docs/usage/application-declaration/)
+
+* [vuejs deployment](https://medium.com/@kamerk22/deploy-vue-js-ssr-vuetify-on-production-with-pm2-and-nginx-ec7b5c0748a3)
+
+* To generate `ecosystem.config.js`
+
+  ```sh
+  $ pm2 ecosystem
+  ```
+
+  
+
+* `ecosystem.config.js` generated using above command
+
+```json
+module.exports = {
+  apps: [
+    {
+      name: 'web-apps',
+      script: './app-server/index.js',
+      watch: true,
+      env: {
+        NODE_ENV: 'production',
+      },
+    },
+  ],
+};
+
+```
+