Developers Technical Tutorials

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

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

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 Internet, but some require more…

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…

MindsDB – Machine Learning with MySQL Tables Using PHP

By Mike Goh October 10, 2022Developers Technical TutorialsCoding, SoftwareNo Comments

Introduction Machine learning has been around for a long time, and the emphasis on making sense of data was a selling point for many small and medium businesses. My first blush with machine learning was when I was assigned the…

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…

Install Splunk on Linux with Trial to Free License

By Mike Goh August 13, 2022Developers Technical TutorialsDevOps, SoftwareNo Comments

Introduction I have heard of Splunk - a log analysis tool but having worked in the IT industry for last 15 years, I never had to work with it. However, one of my new job requirement as a Site Reliability…

Set Up SFTP Chroot Jail using OpenSSH

By Mike Goh July 29, 2022Developers Technical TutorialsCommand Line, SecurityNo Comments

Introduction You may want to use one of your existing servers as a SFTP server without subscribing to another EC2 instance. Or you would like to have multiple SFTP users/vendors on a single SFTP server to save on resources and…

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…

DevOps Tools – Troubleshooting Guide

By Mike Goh March 28, 2022Developers Technical TutorialsDevOps, DockerNo Comments

Topic Jenkins, From Zero To Hero Become a DevOps Jenkins Master Sourcejenkins/centos7/DockerfileErrorStep 2/7 : RUN yum -y install openssh-server---> Running in 7e18f84a2754CentOS Linux 8 - AppStream 391 B/s | 38 B 00:00Error: Failed to download metadata for repo 'appstream': Cannot…