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
Containers & Kubernetes
Engineering field notes
Practical DevOps & Infrastructure Notes
Tested guides for Linux, cloud, containers, and self-hosted services.
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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
AI & Desktop Tools
How to Run Ollama and Open WebUI on WSL 2 Ubuntu 24.04 on Windows 11 with an NVIDIA GeForce RTX 5060 Ti 16GB
Running local AI on Windows 11 does not require a separate Linux machine. A clean setup is to run Ubuntu
Observability & Operations
Install OpenObserve Enterprise HA on Bare-Metal Kubernetes with Traefik + Ceph RGW (S3) + Ceph RBD
This post performs a fresh installation of OpenObserve Enterprise in HA (cluster) mode on a bare-metal Kubernetes cluster using the
Observability & Operations
Add an Ubuntu 24.04 Linux Server Data Source to OpenObserve
This post adds a Linux server (Ubuntu 24.04) as a data source to my existing OpenObserve standalone (local mode) deployment.
Observability & Operations
Deploy OpenObserve Standalone on Bare-Metal Kubernetes with Traefik + Ceph RBD (PVC)
This post deploys OpenObserve in standalone (single-node / local mode) on a bare-metal Kubernetes cluster using the official openobserve-standalone Helm
Observability & Operations
Create a Grafana Dashboard for Backstage Metrics on Mimir (OTel → Alloy → Mimir)
This post continues from: Backstage metrics flow: Backstage (OpenTelemetry SDK) → OTLP/HTTP → Alloy → remote_write → Mimir → Grafana
Cloud, Linux & Virtualization
Upgrade a Single-Node Ceph Squid (v19) cephadm Cluster to Tentacle (v20) on Ubuntu 24.04
…and switch from Ubuntu’s apt cephadm (v19) to a manually downloaded cephadm (v20) This post documents a practical, works-in-real-life upgrade