Developers Technical Tutorials

Disable Cache to Reflect New CSS Changes

By Mike Goh January 9, 2021Developers Technical TutorialsNGINX, WebNo Comments

Introduction You made some changes to your CSS style sheet and upload it to the web server but the browser did not reflect the new look after you hit refresh (F5) or even forced update, disregarding cache (Ctrl + F5).…

Set Up Prometheus for Systems Monitoring, Alertmanager to Send Alerts and Node Exporter as Machine Metrics Collector

By Mike Goh October 30, 2020Developers Technical TutorialsDevOps, NetworkNo Comments

Introduction Previously, we discovered how to deploy Terraform as infrastructure provisioning tool. Today we will learn about infrastructure monitoring. While old-time favorites Zabbix and Nagios are still under active development, Prometheus integrated with Grafana has become a common monitoring stack…

Build and Run Test from Jenkins with Docker

By Mike Goh September 1, 2020Developers Technical TutorialsDevOps, DockerNo Comments

Introduction My DevOps learning roadmap says "learn some CI/CD tool" and so I picked up Jenkins - an open source continuous integration and continuous delivery automation server. Although I am already using GitLab to keep track and backup my source…

Using Docker Swarm Container Orchestration to Manage Multiple Containers

By Mike Goh July 25, 2020Developers Technical TutorialsDevOps, DockerNo Comments

Introduction Previously, I had mastered the basics of Ansible as infrastructure configuration management tool as part of my self-learning DevOps journey. Today, I had to understand and try out what is a container orchestration tool. I started with Kubernetes as…

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…

Bash Script to Sync WordPress Docker Production to Demo

By Mike Goh June 6, 2020Developers Technical TutorialsCommand Line, Docker, WordPressNo Comments

Introduction After we had upgraded a website from development to production status, we will need to put up a maintenance notice if we are required to make further changes. It is unpleasant to let visitors see the down-time or on-going…

Set Up DKIM, SPF and Reverse DNS to Improve Mail Deliverability

By Mike Goh May 14, 2020Developers Technical TutorialsEmail, SecurityNo Comments

Introduction DomainKeys Identified Mail (DKIM) is a protocol that contributes to DMARC compliance and requests the sender origin to take responsibility for sent messages that can be verified by mailbox providers. Essentially, it enables the outbound domain to digitally sign…

Disable Cache to Reflect New CSS Changes

Set Up Prometheus for Systems Monitoring, Alertmanager to Send Alerts and Node Exporter as Machine Metrics Collector

Build and Run Test from Jenkins with Docker

Using Docker Swarm Container Orchestration to Manage Multiple Containers

Using Ansible to Automate Deployment for Apps and IT Infrastructure

Bash Script to Sync WordPress Docker Production to Demo

Set Up DKIM, SPF and Reverse DNS to Improve Mail Deliverability

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

Asus Router Setup – Wifi Settings

Create Helpdesk Ticketing System with Google Apps Script

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