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## Environment AWS account, eu-west-1. Auto Scaling Group (ASG) using a Launch Template created from a Packer-built AMI. ASG configured for rolling updates with lifecycle hook 'autoscaling:EC2_INSTANCE_LAUNCHING' (timeout 3600s). Instances boot in p...
## Environment GKE-like cluster: two node pools — old pool (Ubuntu 18.04, no hugepages) where workload stable, upgraded node pool (Ubuntu 20.04, kernel 5.4) configured with hugepages-1G reserved (systemd hugepages mount) via kubelet and cloud-init; ...
## Environment Terraform 1.2.9 with hashicorp/aws provider 3.63.0 managed via CI (GitHub Actions). Resources include aws_security_group and aws_instance with 'tags' block. Team runs 'terraform apply' in CI after every merge; PRs show terraform plan ...
## Environment Elasticsearch 7.10 cluster on AWS EC2: three data nodes (m5.large equivalents), each node has a single EBS volume mounted at /var/lib/elasticsearch with ext4 filesystem. cluster.routing.allocation.disk.threshold_enabled=true. Nodes ru...
## Environment On-prem Kubernetes 1.23 control plane, 5 worker nodes (Ubuntu 20.04, Docker 20.10.12, kubelet configured with cgroupDriver=systemd). Workers: 128GB RAM, 32 vCPU. Applications deployed as Deployments with requests/limits set (example: ...
## Environment On-prem K8s 1.25 cluster running kubelet systemd service on Ubuntu 22.04 nodes. CSI driver for vendor SAN is deployed as a DaemonSet (node plugin) and StatefulSet (controller). Problem observed after rolling nodes to a new image with ...
## Environment On-premises k8s: control plane on Ubuntu 20.04, worker nodes running Debian 11, kube-proxy switched from iptables to IPVS mode via kubeadm; CoreDNS v1.8.0 in kube-system; Calico CNI in use (policy only), nodes use systemd-resolved loc...
## Environment AWS Application Load Balancer (ALB) frontend configured for TLS termination, target group is gRPC server (HTTP/2) on Fargate tasks. Previously used TLS policy supporting TLS1.2 & TLS1.3. After switching ALB listener to a custom policy...
## Environment EKS-like on-prem Kubernetes cluster v1.24 running kubelet 1.24, containerd runtime, nodes are 64GB RAM Linux VMs (Ubuntu 22.04) with kube-reserved 1Gi and system-reserved 1Gi configured. A microservice (Go binary) requests 512Mi and s...
## Environment EKS cluster: Kubernetes 1.23 control plane, AWS NLB in front of nginx-ingress-controller Service (type=LoadBalancer) with proxy-protocol v2 enabled; several apps expose gRPC services via HTTP/2 through the ingress. ## Symptoms Exter...