Create a Custom VPC Based on the Default VPC Layout
AWS creates a default VPC in many Regions. It is convenient for quick testing because it already has public subnets,
Networking & Connectivity
Engineering field notes
Practical DevOps & Infrastructure Notes
Tested guides for Linux, cloud, containers, and self-hosted services.
Latest articles
Data Platforms & Analytics
Deploy OSM Services with Nominatim and OSRM on Ubuntu 26.04
This post shows how to deploy OpenStreetMap-related services on a separate Ubuntu 26.04 server. The OSM service domain used in
AI & Desktop Tools
Fix PuTTY Right-Click Paste Not Working in vi on Ubuntu 26.04
When I connected to an Ubuntu 24.04 server using PuTTY, I could open vi, enter insert mode, and paste text
Data Platforms & Analytics
Install PostgreSQL 18 with PostGIS on Ubuntu 24.04
PostGIS adds spatial database features to PostgreSQL. With PostGIS, PostgreSQL can store geographic data such as coordinates, points, routes, and
IoT & Embedded Systems
How to Bulk Delete ThingsBoard Devices by Prefix Using Python
In this post, I will show how to safely bulk delete ThingsBoard devices by name prefix using Python. This is
Data Platforms & Analytics
Collect U.S. Stock Daily Close Prices into ThingsBoard with Polygon, Docker, and Kubernetes
In this post, I will show how to run a Python-based stock data collector that publishes U.S. stock market data
Containers & Kubernetes
Troubleshooting Kubernetes Node Disk Usage When a Pod Reports Low Disk Space
After running Kubernetes for a while, I noticed that some systems running inside my Kubernetes cluster started reporting low disk
Identity, Security & PKI
Enable Key Recovery in EJBCA for Device Certificates
In my previous post, I used EJBCA RA Web to issue ThingsBoard device certificates from an externally signed IoT device
Identity, Security & PKI
Manage ThingsBoard Device Certificates with EJBCA After Creating an External IoT Device CA
In my environment, I already had Step CA running as my private PKI bootstrap CA, EJBCA CE running on Ubuntu
AI & Desktop Tools
How to Use Subtitle Edit 4.0.15 to Add Traditional Chinese Subtitles to a Video on Windows
If you have a video with Chinese speech and want to add Traditional Chinese subtitles to it, Subtitle Edit provides