Create an EC2 AMI from Official OPNsense 25.1 Nano (raw) Image
This post shows how to convert the official OPNsense 25.1 Nano disk image (.img.bz2) into an EC2 AMI using VM […]
Networking & Connectivity
Engineering field notes
Practical DevOps, Infrastructure, and Platform Engineering Notes
Tested walkthroughs from real lab and production-style setups across Linux, cloud, Kubernetes, networking, security, observability, data platforms, IoT, Android, and self-hosted services.
Networking & Connectivity
Build OPNsense 25.1.3 Nano Image from Source
OPNsense 25.1.3 is based on FreeBSD 14.2, but follow the build host version recommended by opnsense/tools for your chosen tag.
Identity, Security & PKI
Automatically Renew Let’s Encrypt Certificates Using Certbot on Ubuntu 24.04
Certbot is designed to automatically renew certificates before they expire. The process works as follows: To verify the timer is
Observability & Operations
Install Zabbix on Ubuntu 24.04
Start new shell session with root privileges. Make sure you have a database server up and running (I use MariaDB
DevOps & Software Delivery
Trigger AWS CodeBuild in Jenkins Pipeline
Your IAM user should have the policy with the following permissions: Replace ACCOUNT with your AWS Account ID. Open Jenkins
Android & Mobile Development
Build Android App from GitHub Repository Using AWS CodeBuild
Go to AWS Console → CodeBuild. Click Create project. Fill in the Project Name (e.g., android-sample-build). In Source: Inside your
Containers & Kubernetes
Build a Docker Image and Push it to Docker Hub
Create a new file called Dockerfile: Run the following command to build your custom image: If you haven’t logged in
DevOps & Software Delivery
Use Jenkins Docker Plugin to Run Jenkins Jobs Inside Docker Containers
If Docker is not installed yet, install it first. Then, add Jenkins to the Docker group to allow it to
Containers & Kubernetes
Install Docker on Ubuntu 24.04
Remove any existing Docker packages to avoid conflicts: Ensure your package index is up-to-date: Add Docker’s GPG key to verify
DevOps & Software Delivery
Install Jenkins on Ubuntu 24.04
Jenkins requires Java, so install OpenJDK: This will open a blank editor. Add the following lines: Save the file and