Tag: Linux

Challenge Development

🚀 Running Python Code as Daemon on Linux VPS

Post author By admin
Post date August 23, 2025
No Comments on 🚀 Running Python Code as Daemon on Linux VPS

📋 Table of Contents

1. Project Structure Setup
2. Virtual Environment Configuration
3. Systemd Service Creation
4. User and Permissions Management
5. Common Issues and Solutions
6. Monitoring and Logging
7. Code Updates and Maintenance
8. Security Best Practices
9. Advanced Configurations
10 Troubleshooting

Tags Linux, Python

Challenge Development Productivity

Run Python code in cloud with low/zero cost: options & more

Post author By admin
Post date August 22, 2025
No Comments on Run Python code in cloud with low/zero cost: options & more

One can absolutely run Python code in the cloud with low/zero cost, and existing VPS is actually the best option for persistent (“daemon”) execution. Below is a detailed comparison of all options, with clear recommendations based on your scenario.

✅ Existing VPS is the PERFECT Solution (Zero Cost Beyond Existing Server)

Since you already have a VPS with Python installed, this is the most cost-effective and reliable option for running code as a daemon. No new costs, full control, and no cloud vendor limitations.

Spoiler: Step by Step setup at VPS.

How to Run as a Daemon on Your VPS:

Use systemd (Modern Linux – Recommended)
Create a service file (e.g., /etc/systemd/system/myapp.service):

   [Unit]
   Description=My Python App
   After=network.target

   [Service]
   User=youruser
   WorkingDirectory=/path/to/your/app
   ExecStart=/usr/bin/python3 /path/to/your/app/main.py
   Restart=always
   RestartSec=5

   [Install]
   WantedBy=multi-user.target

Then:

   sudo systemctl enable myapp  # Auto-start on boot
   sudo systemctl start myapp   # Start now

Tags Linux, Python

Development

Centos 7, Node.js, MySQL connect

Post author By admin
Post date November 18, 2020
No Comments on Centos 7, Node.js, MySQL connect

I’ve mariadb installed on my VDS with Centos 7.
I’ve installed mysql npm package:

npm i mysql

Yet requesting that package with

var mysql = require('mysql');

has not provided to the successful connection.
While

var mysql = require('mariadb');

has done.

var mysql = require('mariadb');

var con = mysql.createConnection({
  host: "localhost",
  user: "admin_default",
  password: "xxxxxx",
  database: 'admin_default'
}).then(function (){
   console.log('connected!');
}, function(err){
   console.log(err);
});
//console.log(con);

Tags Linux, Node.js

Development

VPS/VDS firewall settings to let Node.js be accessible externally

Post author By admin
Post date November 2, 2020
No Comments on VPS/VDS firewall settings to let Node.js be accessible externally

Problem

I’ve made a simple node.js server at VDS:

var http = require('http');
http.createServer(function (req, res) {
  let port = 9999; 
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World\n');
}).listen(post, '0.0.0.0');
console.log('Server running at port ' + port);

It works outputting:

Server running at port 9999

yet I can’t reach it at VPS/VDS IP where the code is residing: http://webscraping.pro:9999/ How to solve that?