76 articles
kubectl says 'context not found', 'no configuration has been provided', or 'error loading config file'. Here's every cause — wrong KUBECONFIG path, missing context, corrupted config — and exactly how to fix each one.
Prometheus is crashing with OOMKilled or running out of memory. The culprit is almost always high cardinality metrics — labels with thousands of unique values. Here's how to find which metrics are killing your Prometheus and exactly how to fix it.
Docker daemon fails to start, or the systemd service crashes immediately. Here's how to diagnose dockerd startup failures from storage driver conflicts to corrupted config files.
CodeBuild exits with status 1, times out mid-build, or fails with cryptic phase errors. Here's how to diagnose DOWNLOAD_SOURCE, BUILD, and POST_BUILD failures with specific fixes.
ArgoCD Image Updater detects a new image tag but doesn't update the Application. Here's how to diagnose and fix annotation errors, registry auth issues, write-back problems, and sync failures.
Datadog dashboards show no data, hosts appear offline, or custom metrics aren't showing up. Here's how to systematically diagnose and fix Datadog agent issues on Kubernetes and VMs.
Your workflow runs are still slow even with actions/cache. Cache miss every time, cache key conflicts, wrong paths — here's how to diagnose and fix GitHub Actions caching.
Init container errors block your main containers from starting. Here's how to find the root cause fast — OOMKilled, permission errors, missing secrets, and more.
CloudFormation stack stuck in ROLLBACK_FAILED or UPDATE_ROLLBACK_FAILED state? Here's every cause and the exact steps to recover without losing your resources.
Your Prometheus alert should have fired 30 minutes ago but nothing happened. Here's every reason alerts silently fail — routing, inhibition, receivers, and rule syntax.
StatefulSet pods stuck in Init, Pending, or CrashLoopBackOff state? Here are every cause and the exact fix — PVC ordering, headless service, and init container issues.
GitLab Runner failing to register, showing offline, or not picking up jobs? Here's how to debug and fix runner registration and connection issues.
Node shows DiskPressure condition and pods are getting evicted? Here's how to find what's eating disk space and fix it permanently.
Vault Agent Injector not mounting secrets into your pod? Here's how to debug and fix Vault secret injection issues in Kubernetes step by step.
Getting 'admission webhook denied the request' or webhook timeout errors in Kubernetes? Here's how to debug and fix admission webhook issues step by step.
Kubernetes CronJob missed schedule or not triggering? Here's how to debug and fix CronJob scheduling issues — timezone problems, startingDeadlineSeconds, concurrencyPolicy, and more.
Getting connection timeout or upstream timed out errors through NGINX Ingress? Here's how to debug and fix timeout issues between NGINX and your backend services.
Terraform failing with version constraint conflicts between modules? Here's how to diagnose which module is causing the conflict and resolve it without breaking everything.
Secrets are unavailable and workflows fail when PRs come from forks. Here's why GitHub blocks fork access to secrets by default and the right way to handle it safely.
Pod can't resolve service names or external domains? DNS failures inside Kubernetes pods are caused by CoreDNS issues, ndots config, search domains, or network policies. Here's how to debug and fix each.
Docker builds taking 10+ minutes every time? Here's how to fix layer caching, use BuildKit properly, and cut build times by 80% with multi-stage builds and cache mounts.
Lambda function hitting the 15-minute limit or timing out before that? Here's how to find what's slow, increase timeout properly, and redesign for async patterns.
RDS instance hits 100% storage and your database goes read-only. Here's the immediate fix, how to prevent it with autoscaling, how to monitor free storage, and what's eating your disk.
Your GitHub Actions job times out after 6 hours or hits a custom timeout limit. Here's every cause — hung Docker builds, hanging tests, stuck deployments, missing timeout config — and the exact fix.
Your browser shows 'Access to fetch blocked by CORS policy' when loading from S3 or CloudFront. Here's every cause — missing CORS config, wrong AllowedOrigins, preflight failures — and the exact fix.
CloudFront returns 403 Forbidden but your S3 bucket or origin looks fine. Here's every cause — OAC misconfiguration, bucket policy missing, wrong origin domain, geo-restriction — and the exact fix.
Your pod starts but the ConfigMap or Secret isn't mounted as expected — missing files, stale values, wrong keys, or permission errors. Here's every cause and the exact fix.
docker push to ECR fails with 'Access Denied' or 'no basic auth credentials'. Here's every cause — expired token, wrong region, missing IAM permissions, ECR URI mismatch — and the exact fix for each.
Jenkins failing at Compilation Phase with groovy.lang errors? Every cause explained — bad string interpolation, CPS restrictions, missing brackets — with the exact fix for each.
EKS worker nodes stuck in NotReady or not appearing at all? Here are all the causes and step-by-step fixes for node bootstrap failures.
Getting Terraform lock file conflicts, provider version mismatches, or 'required provider not installed' errors? Here's every cause and how to fix it.
Getting 'permission denied' or 'unauthorized: authentication required' when pushing Docker images in GitHub Actions? Here are all the causes and fixes.
EKS pods can't connect to RDS? Fix RDS connection timeouts from Kubernetes — covers security groups, VPC peering, subnet routing, and IAM auth issues.
Kubernetes readiness probe keeps failing? Learn the exact commands to diagnose misconfigured HTTP, TCP, and exec probes and fix them permanently.
Kubernetes Job stuck in Running, CronJob never triggering, or pods completing but Job shows Failed? Here are the real causes and fixes for each scenario.
Getting 'connection refused' between Docker Compose containers? Here are the 7 most common causes and how to fix each one, with working examples.
Pods stuck in Pending on EKS Fargate? Here are the 8 most common reasons Fargate pods won't schedule and exactly how to fix each one.
Your Service exists but traffic isn't reaching pods. Curl times out, 502s keep coming. Here's every reason a Kubernetes Service fails to route and how to fix each one.
Your GitHub Actions workflow exists but never runs. Here's every reason a workflow fails to trigger and exactly how to fix each one.
Your PersistentVolumeClaim is stuck in Pending and your pod won't start. Here's every reason this happens and exactly how to fix it.
Your Prometheus /targets page shows red. Services are running but Prometheus can't scrape them. Here's every reason this happens — wrong port, NetworkPolicy blocks, ServiceMonitor label mismatch, auth — and exactly how to fix each one.
Your ALB returns 504 Gateway Timeout but the app seems fine. Here's every reason this happens — backend timeouts, keepalive mismatches, health check failures — and exactly how to fix each one.
Getting AccessDenied when Terraform tries to read or write your S3 backend? Here's every cause and the exact fix.
Your Kubernetes node is showing NotReady status. Here's every cause and the exact fix for each one.
Your Horizontal Pod Autoscaler is configured but pods aren't scaling up or down. Here's every reason HPA fails and the exact fix for each.
Your ECS task starts and then immediately stops or keeps restarting. Here's every reason this happens and how to debug and fix it.
Pods suddenly showing 'Evicted' status in Kubernetes? Here's every reason nodes evict pods and exactly how to prevent it from happening again.
Getting 502 Bad Gateway from your Nginx Ingress Controller? Here's every cause and the exact fix for each one.
Getting 'Access Denied' or 'is not authorized to perform' errors in AWS? Here's how to diagnose and fix every IAM permission issue — EC2, EKS, Lambda, S3, and CLI.
Your helm upgrade ran successfully but nothing changed in the cluster. Here's every reason this happens and how to fix each one.
Comparing the three most popular CI/CD platforms head-to-head: features, pricing, speed, and when to pick each one in 2026.
Getting 'permission denied' when running kubectl exec? Here are all the real reasons it happens and exactly how to fix each one.
Getting 'Error: UPGRADE FAILED: another operation (install/upgrade/rollback) is in progress' in Helm? Here's exactly why it happens and how to fix it in under 2 minutes.
Fix AWS Application Load Balancer unhealthy targets. Covers health check misconfigurations, security group issues, target group problems, and EKS-specific ALB controller debugging.
Fix Terraform plan showing unexpected resource destruction. Covers state drift, provider upgrades, import mismatches, lifecycle rules, and safe recovery strategies.
Fix PodDisruptionBudget misconfigurations that block kubectl drain during cluster upgrades, node maintenance, and autoscaler operations. Real scenarios and step-by-step solutions.
Fix Kubernetes DNS resolution failures caused by CoreDNS misconfigurations, ndots issues, and pod DNS policies. Real troubleshooting scenarios with step-by-step solutions.
Fix the common Helm error 'has no deployed releases' that blocks upgrades. Step-by-step diagnosis and 4 proven solutions including history cleanup and force replacement.
Pods won't delete and stuck in Terminating? Here's how to diagnose finalizers, graceful shutdown issues, and force-delete stuck pods step by step.
VPA restarting your pods every time it adjusts resources? Here's how to stop the evictions using Kubernetes 1.35's In-Place Pod Resize feature.
Ingress-NGINX is officially being retired. Your ingress rules will stop working. Here's the step-by-step migration plan to Kubernetes Gateway API before it's too late.
ArgoCD app won't sync? Stuck in OutOfSync or Progressing state forever? Here's every cause and how to fix each one step by step.
GitHub Actions failing with 'no space left on device'? Here's how to free disk space on runners, optimize Docker builds, and handle large monorepos.
Your terraform plan looks clean but apply blows up? Here's how to fix provider conflicts, state drift, and dependency errors step by step.
Pods can't resolve hostnames? Getting NXDOMAIN or 'no such host' errors? Here's how to diagnose and fix CoreDNS issues in Kubernetes step by step.
ImagePullBackOff is one of the most common Kubernetes errors. This guide covers every root cause — wrong image names, missing auth, network issues, rate limits — with step-by-step debugging and fixes.
cert-manager Certificate stuck in a non-Ready state is a common Kubernetes TLS issue. This guide covers every root cause — DNS challenges, RBAC, rate limits, and issuer problems — with step-by-step fixes.
Pods stuck in Pending on EKS are caused by a handful of known issues — insufficient node capacity, taint mismatches, PVC problems, and more. Here's how to diagnose and fix each one.
GitLab CI pipelines fail for dozens of reasons. This guide walks through the most common errors — from Docker-in-Docker issues to missing variables — and shows you exactly how to fix them.
Terraform state lock errors can block your entire team. Learn why they happen, how to safely unlock state, and how to prevent lock conflicts for good.
OOMKilled crashes killing your pods? Here's the real cause, how to diagnose it fast, and the exact steps to fix it without breaking production.
CrashLoopBackOff, OOMKilled, exit code 1, exit code 137 — Docker containers restart for specific, diagnosable reasons. Here is how to identify the exact cause and fix it in minutes.
Your pod says Pending and nothing is happening. Here's how to diagnose every possible reason — insufficient resources, taints, PVC issues, node selectors — and fix them fast.
Helm upgrade failing silently? Release stuck in pending state? This guide covers the 10 most common Helm errors DevOps engineers hit in production — with exact commands and fixes.
Your CI/CD pipeline failed and you don't know why. This complete debugging guide covers GitHub Actions, Jenkins, and ArgoCD failures with real error messages and step-by-step fixes.
The most complete Kubernetes troubleshooting guide for 2026. Learn how to diagnose and fix Pod crashes, ImagePullBackOff, OOMKilled, CrashLoopBackOff, networking issues, PVC problems, node NotReady, and more — with exact kubectl commands.