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Installing Nura/PostmarketOS on Old Samsung Galaxy A3 Android Phone
Albeit late to the phone rooting/modding game, this post explains how I installed Nura (fomerly known as postmarketOS) onto an old Samsung Galaxy A3 android phone. The power consumption is 4.4 W when charing, 1.1W when fully charged.
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HDMI Over IP – Streaming a Headless Node’s Video Output Over the Network
I have several desktops/laptops (nodes) that sit on a shelf and run in headless mode. It works for the most part, except when it doesn’t – then it quickly becomes a major pain to troubleshoot. An issue got me thinking – can I perform rudimentary troubleshooting and/or perform a fix without having to physically remove the node from the shelf?
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Atlantis – Preventing Arbitrary Scripts/Programs from Running using Open Policy Agent (OPA) Policies
CI/CD components are prime targets for malicious actors as they often have elevated permissions. In fact, Atlantis documents it right at the top of it’s Security page. In this post, I explain how to configure Atlantis server to prevent the dangerous “external” data source from being executed by Atlantis.
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Using GitLab CI Job Token To Create/Close Merge Requests
Since GitLab 18.4, it is possible to use the default CI Job Token to create/close Merge Requests.
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Setting Up Gitea with Atlantis (Terraform CI for Pull Requests)
I found the official documentation a bit too generic / confusing, so decided to jot down how I set mine up. Gitea will be running directly on the host, while Atlantis as a podman container on the same host.
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Automatically Create Mountpoint Directories for Remote Filesystems in /etc/fstab
Before I learnt this approach, one of the challenges I faced when building a reusuable VM image is to define the mountpoints ahead of time. I found this breakthrough when I read more about systemd’s mount unit configuration, which specifically states that under the [Mount] section:
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How Do du and duc Work, and Which One Should I Choose?
GNU Core Utilities’s du is one of the most widely used Linux utility to estimate how much disk space a particular set of files are using on a filesystem. I chanced across duc (du-cached) and wanted to give it a try to evaluate its effectiveness against a large filesystem. But I kept wondering how du and duc worked, and which one was really faster when calculating disk utilization.
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TIL: Separate OpenTelemetry Receivers That Scape, from Those That Receive Signals from Clients
If both types of receivers are contained within the configuration file, it will result in duplicated processing of scraped signals by multiple collectors. This may result in unintended outcomes, such as excessively scaling out a downstream system, or sinking twice as many logs into a third party storage service.
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Certified Argo Project Associate (CAPA)
I took and passed the Certified Argo Project Associate certification exam offered by Linux Foundation. I believe that my knowledge in Kubernetes allowed me to pick this up quickly, and focus solely on the Argo specific nuances. These are the resources I used:
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AWS Certified Security – Specialty (SCS-C03)
This certification focuses on the skills required to create and implement security solutions in the AWS cloud. As with the more advanced levels, it also looks at how to implement these solutions at scale – both multi-region and multi-account. I spent 4 months preparing for this certification, and these are the resources I used.
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Ordering Systemd Units With Wants, Requires, Requisite, Before, and After
When you need to define the startup sequence of your Systemd units, you have a few options under the [Unit] section that define the ordering and/or dependency. Ordering is the sequence of which the Systemd units start, while dependency is the relationship between two (or more) units.
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TIL: Logs in Cloudwatch Log Group Take a Few Minutes Before Showing up in Cloudwatch Logs Insights Query
TL;DR – When CloudWatch Logs receives the logs, the logs take a few minutes before it’s available to query via Log Insights. I found that waiting for 3 minutes before querying works reliably. If you want real time event processing, use a service like AWS Kinesis.
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Enabling Huge Pages for Gitlab Runner Jobs in AWS EKS with Karpenter
This post explains how to enable huge pages for GitLab Runner jobs using the Kubernetes exectuor, deployed on an AWS Elastic Kubernetes Service (EKS) cluster using Karpenter.
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Not Authorized to Perform ScheduleQuery on CloudWatch Log Group
TL;DR: If you get ScheduleQuery IAM permission error for CloudWatch Logs, check your Log Group name and/or the logs:StartQuery permission.
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