Developers Technical Tutorials

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

Last updated 22 Jan 2024 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…

NAS: Rebuild Raid with SSD using Hard Drive Adapter (caddy)

By Mike Goh January 13, 2022Developers Technical TutorialsNetworkNo Comments

Introduction I knew but never bothered with NAS (Network Attached Storage) until 2015. It is an era where smartphones are getting smarter, and my desktop is still running on the mechanical hard disk instead of SSD. The more adventurous individuals…

Use SensMax API to Get Data from Live Reports with cURL

By Mike Goh November 1, 2021Developers Technical TutorialsCoding, WebNo Comments

Introduction The Covid-19 pandemic has brought many changes to our daily lifestyle. Mask on, and social distancing is one of many. In my country, Singapore, every shopping mall, big or small attraction, must adhere to government restrictions on capacity limits.…

Bash Script Backup MySQL Databases

By Mike Goh June 10, 2021Developers Technical TutorialsBackup, Command LineNo Comments

Introduction Back in the good old days, when Git was not invented, database administrators will use a bash script to backup their MySQL databases periodically. This method is not true anymore because GitHub, GitLab and Bitbucket provide free plans and…

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

Install Splunk on Linux with Trial to Free License

Set Up SFTP Chroot Jail using OpenSSH

Troubleshoot and Fix Windows Problems

DevOps Tools – Troubleshooting Guide

NAS: Rebuild Raid with SSD using Hard Drive Adapter (caddy)

Use SensMax API to Get Data from Live Reports with cURL

Bash Script Backup MySQL Databases

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