Engineering Logs for Troubleshooting & Debugging
Problem: NGINX Ingress Controller PVC Stays Pending After Adding a Logging Volume The NGINX Ingress Controller is deployed via the official Helm chart. After extending the chart to mount a dedicated PersistentVolumeClaim (PVC) for request logging and cache files, the PVC nginx-logging never reaches the Bound phase. The controller pod remains in Pending and the … Read more
Problem: ModelCollection CRD creation returns 422 after Argo CD sync In an on‑premise Kubernetes 1.27 cluster running the KFServing (now KServe) model serving stack, an Argo CD application that contains a ModelCollection manifest fails during the sync phase. The controller logs show a 422 Unprocessable Entity response from the modelcollection.kserve.io admission webhook, with errors such as: admission … Read more
Problem – Batch Ingestion Jobs Fail with Exit Code 1 During Multi‑Region Replication In a production Docker Swarm deployment spanning US‑East, EU‑West and AP‑Southeast, nightly batch ingestion services terminate abruptly with exit code 1. The container logs contain messages such as: failed to connect to remote storage: timeout rpc error: code = Unavailable desc = connection … Read more
Problem Description After a Helm upgrade of the haproxy-ingress chart, the HAProxy pods enter CrashLoopBackOff. The container logs show errors such as: Error opening configuration file /etc/haproxy/haproxy.cfg: No such file or directory MountVolume.SetUp failed for volume “haproxy-config”: configmap “haproxy-config” not found cannot open /etc/haproxy/haproxy.cfg: permission denied failed to reload haproxy: configuration file is not readable … Read more
Kubernetes API server unreachable behind HAProxy after health‑check timeout Problem Description (Symptoms and Impact) During a routine AI inference workload deployment, the control‑plane components (controller‑manager, scheduler, kubelet) began reporting: Failed to connect to apiserver: net/http: request canceled (Client.Timeout exceeded while awaiting headers) HAProxy returned 502 errors to any client trying to reach https://k8s‑lb.example.com: SC– 502 … Read more
Problem Description During local development a vector‑search service (e.g., Milvus, Faiss, or a custom LangChain vector store) is run inside a Docker Compose stack. The service stores its index files on a host‑mounted directory /data/index. When the service attempts to rebuild the index, the container crashes with errors such as: Traceback (most recent call last): … Read more
Problem Description The multimodal inference service runs inside Docker containers on a Kubernetes cluster. Each pod receives a live video feed with an accompanying audio track, processes them with an AI model, and re‑encodes the synchronized stream for downstream consumption. After enabling the Horizontal Pod Autoscaler (HPA) and scaling from 2 to 8 inference pods, … Read more
RAG Pipeline Chunk Overlap Causing Duplicate Context Injection in Kubernetes Problem The Retrieval‑Augmented Generation (RAG) service deployed on a GPU‑accelerated Kubernetes cluster began exhibiting: Excessive token duplication in the vector store, leading to inflated embedding counts. Memory pressure on A100/H100 pods, resulting in OOMKilled restarts. Embedding latency spikes (>30 s) and a 40 % drop in retrieval … Read more
HAProxy worker crashes during PyTorch DDP training due to file descriptor limits Problem Description In a 64‑node multi‑GPU cluster running distributed PyTorch DDP jobs, HAProxy is used as an internal load‑balancer for gRPC/TCP traffic between parameter servers and training workers. During gradient‑synchronization and checkpointing phases the following symptoms appear: HAProxy logs contain haproxy[12345]: Too many … Read more
Docker Container Memory Allocation Failure During Multi‑Region Replication Problem Description During a scheduled multi‑region data replication job, Docker containers that host the replication agents repeatedly terminate with out‑of‑memory (OOM) errors. The failure manifests as: 2024-07-15T03:12:47.321Z containerd[1234]: failed to create shim task: failed to start container: OCI runtime create failed: container_linux.go:380: starting container process caused “process_linux.go:449: … Read more