Servers

Postfix Relay Host – Canonical Maps and Sender Dependent SASL

By Mike Goh August 20, 2024Developers Technical TutorialsCommand Line, ServersNo Comments

Introduction There are several mail transfer agents (MTA) for Linux, like Sendmail, Postfix, and Exim. Sendmail is one of the oldest MTAs available, but it does have some drawn-out configuration steps and is too large in my opinion. The lightweight…

Install NVMe M.2 SSD using PCI Express Adapter Card

By Mike Goh October 3, 2023Developers Technical TutorialsFun, ServersNo Comments

Introduction Many ardent PC enthusiasts have experienced the transition from 3.5-inch mechanical IDE hard disk drives with 5400/7200 rpm to 2.5-inch Serial ATA solid-state drives. Many motherboards these days support M.2 NVMe (Non-Volatile Memory Express), which is a popular choice…

Linux Troubleshooting Guide

By Mike Goh February 7, 2023Developers Technical TutorialsCommand Line, ServersNo Comments

Last updated 14 Nov 2024 During my learning of DevOps tools, I have encountered numerous problems. These difficulties can range from solving the dependency requirement to installing the tools themselves. The majority of solutions to issues are found on the…

Create a High Availability Setup – HetrixTools, PagerDuty, Python, Cloudflare

By Mike Goh October 31, 2022Developers Technical TutorialsBackup, ServersNo Comments

Introduction This tutorial will cover three things: Webhooks in Python with Flask, integrating PagerDuty with HetrixTools monitoring service, and using the Cloudflare DNS API with the⁣ cURL command. Python is one of the top programming languages for developers, and we…

Set Up Chef Infra Server, Workstation, Bootstrap Node and Create Cookbook

By Mike Goh August 30, 2022Developers Technical TutorialsDevOps, ServersNo Comments

Introduction Chef is an infrastructure as code (IAC) automation tool used to configure downstream clients known as nodes. This is one of the many configuration management tools used in DevOps among Ansible and Puppet. There are currently more jobs requiring…

Troubleshoot and Fix Windows Problems

By Mike Goh April 18, 2022Developers Technical TutorialsServersNo Comments

Introduction I have encountered various Windows problems and had to troubleshoot them while working as a system administrator dealing with Active Directory, Print server, and Level 1 support for end-user laptops. Some fixes are worth noting down because they are…

Using Ansible to Automate Deployment for Apps and IT Infrastructure

By Mike Goh July 3, 2020Developers Technical TutorialsDevOps, ServersNo Comments

Introduction Ansible is one of the few configuration management tools in the DevOps environment. It is an infrastructure automation platform used to deploy our applications and systems rapidly to enable continuous integration and continuous deployment. While there are others like…

Host Website on IPv6 NAT VPS with Cloudflare DNS and NGINX

By Mike Goh April 26, 2020Developers Technical TutorialsServers, WebNo Comments

Introduction Cloud services like AWS, DigitalOcean and lesser-known VPS hosting providers sell VM (Virtual Machines). The annual price can range from $20 (less-known providers) to $70 for cloud services like AWS. All VM plans come with 1 dedicated IPv4 address…

Change Port and Disallow Root Login to Secure SSH Server

By Mike Goh April 24, 2020Developers Technical TutorialsSecurity, ServersNo Comments

When you subscribe to a Linux VPS (Virtual Private Server) from any host providers, the default firewall rule is to accept all incoming connections to any ports hence you can connect via Port 22 using a SSH telnet client like…

Postfix Relay Host – Canonical Maps and Sender Dependent SASL

Install NVMe M.2 SSD using PCI Express Adapter Card

Linux Troubleshooting Guide

Create a High Availability Setup – HetrixTools, PagerDuty, Python, Cloudflare

Set Up Chef Infra Server, Workstation, Bootstrap Node and Create Cookbook

Troubleshoot and Fix Windows Problems

Using Ansible to Automate Deployment for Apps and IT Infrastructure

Host Website on IPv6 NAT VPS with Cloudflare DNS and NGINX

Change Port and Disallow Root Login to Secure SSH Server

Asus Router Setup – Wifi Settings

How to Resolve iptables: No chain/target/match by that name

Create Helpdesk Ticketing System with Google Apps Script

Host Multiple Websites with jwilder nginx-proxy and letsencrypt-companion