Developers Technical Tutorials

OpenShift Prometheus Monitoring: VictoriaMetrics and Grafana

By Mike Goh April 17, 2025Developers Technical TutorialsDevOps, SoftwareNo Comments

Introduction Red Hat OpenShift built on top of Kubernetes is used in many organisations these days. The OpenShift container platform allows for container orchestration and management through a web console with ease. It is a trusted Platform as a Service…

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…

Auto Remediation with Zabbix Monitor and Ansible IT Automation

By Mike Goh April 9, 2024Developers Technical TutorialsAutomation Tools, DockerNo Comments

Introduction Automated remediation aims to reduce the recovery time objective (RTO), which is the maximum acceptable time that an application, network, or system can be down after an unexpected failure takes place. Ansible is one of the most popular DevOps…

Use GitPython Library to Push Code to Git Repository

By Mike Goh February 29, 2024Developers Technical TutorialsCoding, DevOpsNo Comments

Introduction Git is the most commonly used version control tool for coordinating CI/CD work among programmers. Popular code repositories include GitLab, Bitbucket, and others. We have to checkout, add, commit, and push every time we want to update the repo.…

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…

Stock Picker – Valuation Metrics Analysis

By Mike Goh May 4, 2023Developers Technical TutorialsSoftware, WebNo Comments

Introduction Most people will invest in equities at some point, unless you are someone who doesn't believe in equities and will put your savings in the bank for principal sum assurance. The brokerage system that you order the stocks should…

How to and Benchmark of awk, grep and sed on Multiple (AND) Keywords

By Mike Goh March 5, 2023Developers Technical TutorialsCoding, Command Line4 Comments

Introduction grep is useful for searching and matching text and regular expressions in one or more files on Linux. One example is finding information in logs that is related to a particular incident. We will provide a unique identifier such…

Linux Troubleshooting Guide

By Mike Goh February 7, 2023Developers Technical TutorialsCommand Line, Servers1 Comment

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…

Developers Technical Tutorials

OpenShift Prometheus Monitoring: VictoriaMetrics and Grafana

Postfix Relay Host – Canonical Maps and Sender Dependent SASL

Auto Remediation with Zabbix Monitor and Ansible IT Automation

Use GitPython Library to Push Code to Git Repository

Install NVMe M.2 SSD using PCI Express Adapter Card

Stock Picker – Valuation Metrics Analysis

How to and Benchmark of awk, grep and sed on Multiple (AND) Keywords

Linux Troubleshooting Guide

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