ec2

IAM permission denied when attaching role during blue‑green EC2 deployment

by
Race car with cartoon graphics and aws logo

Problem – IAM Permission Denied When Attaching Role During Blue‑Green EC2 Deployment A fully automated blue‑green deployment creates a fresh EC2 fleet, assigns a pre‑defined IAM role to each instance, switches the load balancer target group, and finally terminates the old fleet. During the AssociateIamInstanceProfile step the deployment script aborts with: ClientError: An error occurred (UnauthorizedOperation) when … Read more

Context window overflow on EC2 inference after sending oversized prompt

by
Female speaker presenting in front of a projector screen

Problem: Context Window Overflow on EC2‑Hosted LLM Inference When a batch job on an on‑premises server sends a prompt that exceeds the token limit of the deployed large language model (LLM), the inference API on the AWS EC2 instance returns a TokenLimitExceeded error. The failure manifests as: 2026-09-30T14:12:03.421Z ERROR inference_service: TokenLimitExceeded: Prompt length 8192 tokens … Read more

Upsert timeout writing checkpoints from multi‑GPU EC2 training job

by
Female speaker presenting in front of a projector screen

Problem – Upsert Timeout When Writing Checkpoints from a Multi‑GPU EC2 Training Job During a distributed PyTorch training run on an m5.24xlarge instance with 8 NVIDIA A100 GPUs, the checkpointing routine attempts to write model metadata (epoch, loss, S3 URI) into a PostgreSQL database using an UPSERT statement. After the 3rd epoch the job aborts … Read more

Inference queue backlog on EC2 during CI/CD pipeline execution

by
Race car with cartoon graphics and aws logo

Problem During CI/CD pipeline runs that automatically deploy new model versions, the inference service running on a fleet of Amazon EC2 instances experiences a rapid increase in request latency. The inference_queue length grows to several thousand entries, causing time‑outs and failed inference jobs. Typical symptoms observed in the pipeline logs are: [2026-09-22T14:03:12Z] INFO inference_worker: Queue … Read more

RAG pipeline returns empty retrieval results on AWS EC2 local dev

by
Female speaker presenting in front of a projector screen

Problem: RAG pipeline returns empty retrieval results on an AWS EC2 instance (local development) During local development on an EC2 t3.medium (Ubuntu 22.04) the LangChain retrieval‑augmented generation (RAG) pipeline executes without errors but always yields the log message “No documents found”. The same code runs correctly on a developer laptop. Typical symptom in the application … Read more

AWS EC2 inference service connection timeout to RAG vector store

by
Race car with cartoon graphics and aws logo

Problem Description The inference service deployed on an AWS EC2 instance (private subnet) cannot establish a TCP connection to the remote RAG vector store (Milvus, Pinecone, or Qdrant). Every request to retrieve relevant documents ends with a timeout, causing the entire inference pipeline to fail. Typical log excerpts: 2024-09-10T12:34:56.123Z ERROR langchain.vectorstores.milvus: connect ETIMEDOUT 172.31.45.23:443 2024-09-10T12:34:57.001Z … Read more

EC2 node port conflict during auto-scaling of AI inference services

by
Female speaker presenting in front of a projector screen.

Problem Description During rapid auto‑scaling of a real‑time video analytics pipeline, newly launched EC2 instances intermittently crash the AI inference workers and drop video frames. The failure manifests as binding errors from both the TensorFlow Serving containers and the WebSocket ingestion daemons: EADDRINUSE: address already in use :::8080 BindException: Address already in use (Bind failed) … Read more

Kubernetes StatefulSet update timed out on AWS EC2

by
Female speaker presenting in front of a projector screen.

Problem – StatefulSet Update Times Out on AWS EC2 During a production rollout of a machine‑learning model service, the StatefulSet responsible for serving the model failed to complete its rolling update. The kubectl rollout status command returned: statefulset.apps/model-service rollout status: waiting for rollout to finish: 1 out of 3 new replicas have been updated… error: … Read more

EC2 AI model output schema mismatch after deployment

by
Female speaker presenting in front of a projector screen.

Problem Description After deploying a large language model (LLM) that uses OpenAI‑style function calling (tool use) on Amazon EC2, the downstream service that parses the model’s responses repeatedly raises schema‑validation errors. Typical log entries look like: ERROR: Output schema mismatch – received: “`json\n{…}\n“` expected: <JSON object> json.JSONDecodeError: Expecting value: line 1 column 1 (char 0) … Read more

EC2 batch ingestion timeouts during high volume Redshift loads

by
Female speaker presenting in front of a projector screen.

Problem – Intermittent EC2 Batch Ingestion Timeouts During High‑Volume Redshift Loads A daily data pipeline runs on an Auto Scaling group of Amazon EC2 instances. Each instance reads structured log files from Amazon S3 and issues a COPY command to load the data into an Amazon Redshift cluster. During peak ingestion windows the following symptoms … Read more