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Kernel-based virtual machines (KVM) and cloud server management.

Postfix Relay Host – Canonical Maps and Sender Dependent SASL

Postfix Relay Host – Canonical Maps and Sender Dependent SASL

Posted by By Mike Goh August 20, 2024Posted inDevelopers Technical TutorialsTags: Command 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…
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Install NVMe M.2 SSD using PCI Express Adapter Card

Install NVMe M.2 SSD using PCI Express Adapter Card

Posted by By Mike Goh October 3, 2023Posted inDevelopers Technical TutorialsTags: Fun, 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…
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Linux Troubleshooting Guide

Linux Troubleshooting Guide

Posted by By Mike Goh February 7, 2023Posted inDevelopers Technical TutorialsTags: Command 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…
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Create a High Availability Setup – HetrixTools, PagerDuty, Python, Cloudflare

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

Posted by By Mike Goh October 31, 2022Posted inDevelopers Technical TutorialsTags: Backup, 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…
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Set Up Chef Infra Server, Workstation, Bootstrap Node and Create Cookbook

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

Posted by By Mike Goh August 30, 2022Posted inDevelopers Technical TutorialsTags: DevOps, 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…
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Troubleshoot and Fix Windows Problems

Troubleshoot and Fix Windows Problems

Posted by By Mike Goh April 18, 2022Posted inDevelopers Technical TutorialsTags: ServersNo 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…
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Using Ansible to Automate Deployment for Apps and IT Infrastructure

Using Ansible to Automate Deployment for Apps and IT Infrastructure

Posted by By Mike Goh July 3, 2020Posted inDevelopers Technical TutorialsTags: DevOps, 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…
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Which Cloud Providers for Cheapest On-demand Pay-as-you-go Hourly Prices

Which Cloud Providers for Cheapest On-demand Pay-as-you-go Hourly Prices

Posted by By Mike Goh May 2, 2020Posted inSoftware and Web Services ReviewsTags: Cloud, ServersNo Comments
I never had to buy any on-demand virtual machines (VMs) for my app development. This is because I am always subscribed to 2-3 Virtual Private Server (VPS) on yearly plans from lesser-known host providers which is cheaper than the usual…
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Host Website on IPv6 NAT VPS with Cloudflare DNS and NGINX

Host Website on IPv6 NAT VPS with Cloudflare DNS and NGINX

Posted by By Mike Goh April 26, 2020Posted inDevelopers Technical TutorialsTags: Servers, 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…
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Change Port and Disallow Root Login to Secure SSH Server

Change Port and Disallow Root Login to Secure SSH Server

Posted by By Mike Goh April 24, 2020Posted inDevelopers Technical TutorialsTags: Security, 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…
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