Engineering Logs for Troubleshooting & Debugging
Problem The LangChain service is deployed as a stateless Deployment behind an API gateway in a Kubernetes cluster. An HorizontalPodAutoscaler (HPA) is configured to scale the Deployment based on CPU utilization (target 70%) and a custom latency metric exported to Prometheus. Under load the request latency spikes and the CPU usage reported by the metrics-server … Read more
Problem – PostgreSQL pod fails to start in the development sandbox In a Kubernetes‑based development sandbox the PostgreSQL deployment never reaches the Running state. The pod repeatedly crashes with the following pattern: $ kubectl get pod -n dev-sandbox -l app=postgresql NAME READY STATUS RESTARTS AGE postgresql-7f9c9d8b5b-kt9xv 0/1 CrashLoopBackOff 5 3m12s Inspecting the container logs shows … Read more
Problem – RabbitMQ Scheduler Pod Unschedulable During Disaster Recovery Failover During a planned disaster‑recovery (DR) failover, the RabbitMQ rabbitmq-scheduler pod repeatedly enters the Pending state with the following event: Warning FailedScheduling 2m30s (x5 over 5m) default-scheduler 0/3 nodes are available: 3 node(s) had insufficient memory, 3 node(s) had taint {dr/secondary=true:NoSchedule}, and 3 node(s) had pod … Read more
Problem – TorchServe Pods Remain Pending When Using a Custom Scheduler In a Kubernetes cluster that hosts GPU‑enabled node pools, a real‑time inference service is deployed with TorchServe. The deployment succeeds, but the resulting pods stay in Pending state indefinitely. The custom scheduler (configured via a scheduler profile or extender) reports that it cannot find … Read more
401 error from AI inference pod after SAML assertion validation fails Problem In a Kubernetes‑hosted microservices platform, the AI inference service (ai‑model‑svc) began returning HTTP 401 responses for internal calls that should be authenticated via SAML‑based SSO. The failure is logged as “SAML assertion invalid” by the authentication middleware, causing downstream clients to see a hard … Read more
Problem During a staged rollout of nginx across three AWS regions (us-east-1, eu-west-1, ap-southeast-2) the newly created pods repeatedly entered the Pending phase because their PersistentVolumeClaims (PVCs) could not be bound. The issue manifested only after the rollout controller applied the StatefulSet manifest that references a StorageClass with volumeBindingMode: WaitForFirstConsumer. Operators observed the following symptoms: … Read more
Problem: Haystack pod rejected by admission controller after adding GPU request When deploying a Haystack inference service to a GPU‑enabled Kubernetes cluster (A100/H100 nodes), the pod creation fails with an admission controller error. The pod never reaches the Pending state; instead the API server returns a 400 Bad Request response indicating an invalid or missing … Read more
Problem When attempting to launch a PyTorch training job on a local kind cluster, the pod creation fails with an admission controller error. The user sees the following output from kubectl apply and kubectl describe pod: $ kubectl apply -f pytorch-job.yaml pod/pytorch-trainer created error: error when creating “pytorch-job.yaml”: admission webhook “podsecuritypolicy.k8s.io” denied the request: spec.securityContext.runAsUser: … Read more
Problem In a development sandbox (a local kind cluster) the haproxy deployment is configured with a Horizontal Pod Autoscaler (HPA) that should react to both CPU utilization and a custom request‑latency metric. During load testing of an AI model serving pipeline the following symptoms appear: Average request latency climbs from ~30 ms to >500 ms. CPU usage … Read more
Problem When the API gateway scales out, the Helm release that deploys the Redis cache attempts to create additional Redis pods. The pod creation fails with an admission controller error, preventing the cache layer from meeting the traffic demand. Typical console output: $ kubectl scale deployment redis-cache –replicas=5 deployment.apps/redis-cache scaled $ kubectl get pods -w … Read more