121 articles
RSSHow to fix ArgoCD errors — application stuck OutOfSync, sync waves not respected, RBAC permission denied, Helm values not merged, ApplicationSet generator config, repo auth, and webhook not triggering.
How to fix Fly.io errors — fly.toml app vs name confusion, machines API vs legacy apps, Dockerfile build failures, volume per-region, secrets staging, fly proxy for local access, and internal IPv6 routing.
How to fix Lefthook errors — hooks not running after install, {staged_files} empty for new files, glob filter not matching, parallel: true ordering, LEFTHOOK=0 to skip in CI, and lefthook-local.yml overrides.
How to fix NATS errors — no responders to request, JetStream stream not found, consumer redelivery loop, durable vs ephemeral consumers, subject wildcard mismatch, TLS auth setup, and KV bucket basics.
How to fix Valkey errors — client connection refused, RESP protocol compatibility, ACL user setup, cluster slot reshard, persistence config (RDB/AOF), TLS, Sentinel mode, and migrating from Redis.
How to fix docker compose watch errors — develop.watch directive not firing, sync vs sync+restart vs rebuild differences, ignore globs not matching, WSL2 file events delayed, named volumes shadowing watch, and Compose version requirements.
How to fix GitHub CLI errors — gh auth login token scopes missing, multiple accounts switching, gh pr create permission denied, GHE host auth, gh repo clone vs git clone, and API rate limits.
How to fix Helm 3 errors — release already exists, another operation is in progress, --set values not applied, nil pointer template errors, kubeVersion mismatch, hook failures, and ConfigMap changes not restarting pods.
How to fix Coolify self-hosted PaaS issues — server setup, application deployment, Docker and Nixpacks builds, environment variables, SSL certificates, database provisioning, and GitHub integration.
How to fix Docker secrets — BuildKit secret mounts in Dockerfile, docker-compose secrets config, runtime vs build-time secrets, environment variable alternatives, and verifying secrets don't leak into image layers.
How to fix esbuild issues — entry points, plugin API, JSX configuration, CSS modules, watch mode, metafile analysis, external packages, and common migration problems from webpack.
How to fix Git hooks not executing — Husky v9 setup, hook file permissions, lint-staged configuration, pre-commit Python tool, lefthook, and bypassing hooks in CI.
How to fix Python packaging issues — pyproject.toml setup, build backends (setuptools/hatchling/flit), wheel vs sdist, editable installs, package discovery, and twine upload to PyPI.
How to fix Turborepo issues — turbo.json pipeline configuration, cache keys, remote caching setup, workspace filtering, and common monorepo task ordering mistakes.
How to fix AWS Lambda Layer issues — directory structure, runtime compatibility, layer ARN configuration, dependency conflicts, size limits, and container image alternatives.
How to fix AWS SQS issues — visibility timeout, message not delivered, duplicate messages, Dead Letter Queue configuration, FIFO queue ordering, and Lambda trigger problems.
How to fix Celery Beat issues — beat scheduler not starting, tasks not executing on schedule, timezone configuration, database scheduler, and running beat with workers.
How to fix Docker Compose healthcheck issues — depends_on condition service_healthy, healthcheck command syntax, start_period, custom health scripts, and debugging unhealthy containers.
How to fix Docker multi-platform build issues — buildx setup, QEMU registration, --platform flag usage, architecture-specific dependencies, and pushing multi-arch manifests to a registry.
How to fix GitHub Actions artifact issues — upload-artifact path patterns, download-artifact across jobs, retention days, artifact name conflicts, and the v3 to v4 migration.
How to fix GitHub Actions reusable workflow issues — workflow_call trigger, passing inputs and secrets, output variables, caller vs called permissions, and common errors.
How to fix GitHub Actions timeout issues — job-level and step-level timeouts, stuck processes, self-hosted runner timeouts, debugging hanging jobs, and timeout best practices.
How to fix MySQL replication issues — SHOW REPLICA STATUS errors, relay log corruption, GTID configuration, replication lag, skipping errors, and replica promotion.
How to fix Redis Cluster errors — MOVED redirects, CROSSSLOT multi-key operations, cluster-aware client setup, hash tags for key grouping, and failover handling.
How to fix Terraform import errors — terraform import syntax, import blocks (Terraform 1.5+), state conflicts, provider-specific import IDs, and importing existing infrastructure.
How to fix docker-compose.override.yml not being applied — file naming, merge behavior, explicit file flags, environment-specific configs, and common override pitfalls.
How to fix Kubernetes HorizontalPodAutoscaler issues — metrics-server not installed, CPU requests not set, unknown metrics, scale-down delay, custom metrics, and KEDA.
How to fix AWS S3 CORS errors — S3 bucket CORS configuration, pre-signed URL CORS, CloudFront CORS headers, OPTIONS preflight requests, and presigned POST uploads.
How to fix Docker ARG and ENV variable issues — build-time vs runtime scope, ARG before FROM, multi-stage build variable passing, secret handling, and .env file patterns.
How to fix Docker HEALTHCHECK failures — command syntax, curl vs wget availability, start period, interval tuning, health check in docker-compose, and debugging unhealthy containers.
How to fix GitHub Actions secrets that appear empty or undefined in workflows — secret scope, fork PR restrictions, environment protection rules, secret names, and OIDC alternatives.
How to fix nginx load balancing issues — upstream block configuration, health checks, least_conn vs round-robin, sticky sessions, upstream timeouts, and SSL termination.
How to fix Ruby Bundler gem version conflicts — Gemfile.lock resolution, platform-specific gems, bundle update strategies, conflicting transitive dependencies, and Bundler version issues.
How to fix AWS Access Denied errors — understanding IAM policies, using IAM policy simulator, fixing AssumeRole errors, resource-based policies, and SCPs blocking actions.
How to fix Docker layer cache being invalidated on every build — Dockerfile instruction order, COPY optimization, ARG vs ENV, BuildKit cache mounts, and .dockerignore.
How to fix GitHub Actions matrix strategy issues — matrix expansion, include/exclude patterns, failing fast, matrix variable access, and dependent jobs with matrix outputs.
How to fix Kubernetes Secrets not being mounted — namespace mismatches, RBAC permissions, volume mount configuration, environment variable injection, and secret decoding issues.
How to fix Redis Pub/Sub issues — subscriber not receiving messages, channel name mismatches, connection handling, pattern subscriptions, and scaling with multiple processes.
How to fix Terraform 'no value for required variable' errors — variable definition files, environment variables, tfvars files, sensitive variables, and variable precedence.
How to fix Celery tasks not executing — worker configuration, broker connection issues, task routing, serialization errors, and debugging stuck or lost tasks.
How to fix GitHub Actions Docker build and push errors — registry authentication, image tagging, layer caching, multi-platform builds, and GHCR vs Docker Hub setup.
How to fix Kubernetes OOMKilled errors — understanding memory limits, finding memory leaks, setting correct resource requests and limits, and using Vertical Pod Autoscaler.
How to fix Terraform state lock errors — understanding lock mechanisms, safely force-unlocking stuck locks, preventing lock conflicts in CI/CD, and using remote backends correctly.
How to fix ECS tasks that fail to start — port binding errors, missing IAM permissions, Secrets Manager access, essential container exit codes, and health check failures.
How to fix Docker Compose networking issues — services can't reach each other by hostname, port mapping confusion, network aliases, depends_on timing, and host vs container port differences.
How to fix a Docker container that keeps restarting — reading exit codes, debugging CrashLoopBackOff, fixing entrypoint errors, missing env vars, out-of-memory kills, and restart policy misconfiguration.
How to fix Docker multi-stage build errors — COPY --from stage not found, wrong stage name, artifacts not at expected path, and BuildKit caching issues.
How to fix Git repeatedly prompting for credentials — credential helper not configured, HTTPS vs SSH, expired tokens, macOS keychain issues, and setting up a Personal Access Token.
How to fix GitHub Actions env vars and outputs not persisting between steps — GITHUB_ENV, GITHUB_OUTPUT, job outputs, and why echo >> $GITHUB_ENV is required.
How to fix Linux OOM killer terminating processes — reading oom_kill logs, adjusting oom_score_adj, adding swap, tuning vm.overcommit, and preventing memory leaks.
How to fix PostgreSQL 'sorry, too many clients already' error — checking active connections, using connection pooling with PgBouncer, tuning max_connections, fixing ORM pool settings, and finding connection leaks.
How to fix AWS CloudWatch logs not showing up — IAM permissions missing, log group not created, log stream issues, CloudWatch agent misconfiguration, and Lambda log delivery delays.
How to fix Kubernetes ConfigMap updates not reaching running pods — why pods don't see updated values, how to trigger restarts, use live volume mounts, and automate ConfigMap rollouts with Reloader.
How to fix Certbot certificate renewal failures — domain validation errors, port 80 blocked, nginx config issues, permissions, and automating renewals with systemd or cron.
How to fix AWS ECR authentication errors — no basic auth credentials, token expired, permission denied on push, and how to authenticate correctly from CI/CD pipelines and local development.
How to fix Docker build ARG variables that are empty or undefined inside RUN commands — why ARG scope is limited, how ARG and ENV interact, multi-stage build ARG scoping, and secrets that shouldn't use ARG.
How to fix GitHub Actions if conditions that don't evaluate correctly — why steps are skipped or always run, how to use context expressions, fix boolean checks, and handle job outputs in conditions.
How to fix Kubernetes Ingress not routing traffic — why Ingress returns 404 or 502, how to configure annotations correctly, debug ingress-nginx and AWS ALB Ingress Controller, and verify backend service health.
How to fix Docker Compose not loading environment variables from .env files — why variables are empty or undefined inside containers, the difference between env_file and variable substitution, and how to debug env var issues.
How to fix GitHub Actions cache not restoring — why actions/cache always misses, how to construct correct cache keys, debug cache hits and misses, and optimize caching for npm, pip, and Gradle.
How to fix AWS Lambda cold start timeouts and slow first invocations — provisioned concurrency, reducing package size, connection reuse, and language-specific optimizations.
How to fix Elasticsearch index_not_found_exception errors — why index operations fail with 404, how to create indices correctly, manage index aliases, and handle missing indices in production.
How to fix 'No space left on device' errors on Linux — find what is consuming disk space with df and du, clean up logs, Docker images, old kernels, and temporary files, and prevent disk full situations.
How to fix AWS EC2 SSH connection refused or timed out errors — security group rules, key pair issues, sshd not running, wrong username, and network ACL misconfigurations.
How to fix Kubernetes 'exceeded quota' errors — pods stuck in Pending because namespace resource quotas are exhausted, missing resource requests, and LimitRange defaults.
How to fix EMFILE too many open files errors on Linux and Node.js — caused by low ulimit file descriptor limits, file handle leaks, and how to increase limits permanently.
How to fix Nginx WebSocket proxying not working — 101 Switching Protocols fails, connections drop after 60 seconds, missing Upgrade headers, and SSL WebSocket configuration.
How to fix Docker Compose depends_on not working — services start in order but the app still crashes because depends_on only waits for container start, not service readiness. Includes healthcheck solutions.
How to fix cron jobs not running on Linux — caused by PATH issues, missing newlines, permission errors, environment variables not set, and cron daemon not running.
How to fix Webpack Hot Module Replacement not updating the browser — HMR connection lost, full page reloads instead of hot updates, and HMR breaking in Docker or behind a proxy.
How to fix 'sudo: command not found' on Linux — caused by sudo not installed, missing PATH in scripts, Docker containers without sudo, and su vs sudo confusion on minimal systems.
How to fix Nginx location blocks not matching — caused by prefix vs regex priority, trailing slash issues, root vs alias confusion, and try_files misconfiguration.
How to fix Docker container health check failing with unhealthy status, including HEALTHCHECK syntax, timing issues, missing curl/wget, endpoint problems, and Compose healthcheck configuration.
How to fix AWS CloudFormation ROLLBACK_COMPLETE and CREATE_FAILED errors caused by IAM permissions, resource limits, invalid parameters, and dependency failures.
How to fix AWS AccessDeniedException caused by missing IAM permissions, explicit denies, SCPs, resource policies, permission boundaries, and misconfigured roles.
How to fix AWS Lambda timeout errors caused by low timeout settings, cold starts, slow external API calls, VPC configuration, and unoptimized code.
How to fix Docker build sending large build context caused by missing .dockerignore, node_modules in context, large files, and inefficient Dockerfile layers.
How to fix Docker build cache not working when layers rebuild every time despite no changes, including layer ordering, .dockerignore, COPY invalidation, BuildKit cache mounts, and CI/CD cache strategies.
How to fix Docker Compose Service failed to build errors caused by wrong Dockerfile paths, YAML syntax issues, build args, platform mismatches, and network failures.
How to fix Docker 'container name already in use by container' error caused by stopped containers, name conflicts, compose restarts, and stale container state.
How to fix Docker entrypoint not found error caused by wrong file path, Windows line endings, missing shebang, wrong base image, and multi-stage build issues.
How to fix the 'Cannot connect to the Docker daemon' error on Linux, macOS, and Windows, including Docker Desktop, systemctl, WSL2, and Docker context issues.
How to fix Docker exec format error caused by architecture mismatch (ARM vs x86), missing shebang line, wrong entrypoint, and multi-platform build issues.
How to fix Docker 'network has active endpoints' error when removing networks, caused by running containers, stale endpoints, orphaned compose networks, and failed cleanups.
How to fix Docker port is already allocated error by finding processes using the port, removing stopped containers, changing port mappings, and resolving Docker Compose port conflicts.
How to fix GitHub Actions permission denied errors caused by GITHUB_TOKEN permissions, checkout issues, artifact access, npm/pip cache, and Docker socket access.
How to fix kubectl apply errors like 'error validating', 'is invalid', and 'error when creating' caused by YAML syntax issues, deprecated APIs, missing fields, and more.
How to fix the Kubernetes ImagePullBackOff and ErrImagePull errors when a pod fails to pull a container image from a registry.
How to fix Kubernetes OOMKilled pod status caused by memory limit exceeded, container memory leaks, JVM heap misconfiguration, and resource requests/limits settings.
How to fix Kubernetes Pod stuck in Pending state caused by insufficient resources, unschedulable nodes, PVC issues, node selectors, taints, and resource quotas.
How to fix bash command not found error caused by missing PATH, uninstalled packages, wrong shell, typos, missing aliases, and broken symlinks on Linux and macOS.
How to fix the Nginx 413 Request Entity Too Large error when uploading files by adjusting client_max_body_size, PHP limits, Node.js body parser, proxy buffers, Docker ingress, and more.
How to fix the Nginx 504 Gateway Timeout error by tuning proxy timeout settings, fixing unresponsive upstream servers, adjusting PHP-FPM timeouts, and debugging with error logs.
How to fix Nginx SSL handshake failed and certificate errors caused by mismatched keys, wrong certificate chain, expired certs, TLS version issues, and permission problems.
How to fix Nginx upstream timed out error caused by slow backend responses, proxy timeout settings, PHP-FPM hangs, and upstream server configuration issues.
How to fix SSH permission denied publickey password error caused by wrong SSH key, incorrect server config, disabled password auth, wrong username, and file permission issues.
How to fix Terraform state lock error caused by concurrent runs, crashed operations, DynamoDB lock table issues, and stale lock IDs.
How to fix Terraform plan errors including reference to undeclared resource, unsupported attribute, undeclared variable, and unknown module output.
How to fix Terraform resource already exists error caused by out-of-band changes, state drift, import issues, duplicate resource blocks, and failed destroys.
How to fix systemd service failures including 'unit entered failed state', 'Main process exited with code', and 'start request repeated too quickly' using journalctl and service configuration.
How to fix Ansible UNREACHABLE errors caused by SSH connection failures, wrong credentials, host key issues, or Python interpreter problems on remote hosts.
How to fix Docker permission denied errors on mounted volumes caused by UID/GID mismatch, read-only mounts, or SELinux labels.
How to fix the PostgreSQL error 'could not connect to server: Connection refused' caused by server not running, wrong host/port, pg_hba.conf, or firewall issues.
How to fix kubectl errors like 'connection refused', 'context not found', or 'unable to connect to the server' when managing Kubernetes clusters.
How to fix SSH errors like 'Connection timed out', 'Connection refused', or 'No route to host' when connecting to remote servers.
How to fix Docker errors like 'manifest for image not found', 'repository does not exist', or 'pull access denied' when pulling or running images.
How to fix the Nginx 403 Forbidden error caused by file permissions, missing index files, SELinux, or incorrect root path configuration.
How to fix the 'Access Denied' (403 Forbidden) error in AWS S3 when uploading, downloading, listing, or managing objects using the CLI, SDK, or console.
How to fix the 'E: Unable to locate package' error in apt-get on Ubuntu and Debian, including apt update, missing repos, Docker images, PPA issues, and EOL releases.
How to fix the 'no space left on device' error in Docker when building images, pulling layers, or running containers, with cleanup and prevention strategies.
How to fix 'Failed to install provider' and 'Failed to query available provider packages' errors in Terraform, covering registry issues, version constraints, network problems, platform support, and air-gapped environments.
How to fix the Kubernetes CrashLoopBackOff error when a pod repeatedly crashes and Kubernetes keeps restarting it with increasing back-off delays.
How to fix 'Process completed with exit code 1' and other GitHub Actions workflow failures. Covers reading logs, exit codes, Node.js/Python/Docker step failures, secrets and environment variables, GITHUB_TOKEN permissions, checkout issues, caching, timeouts, self-hosted runners, matrix strategy, and artifacts.
How to fix curl errors including 'Failed to connect to host', 'Could not resolve host', 'Operation timed out', and 'SSL certificate problem'. Covers curl exit codes 6, 7, 28, 35, 56, and 60, DNS resolution, proxy settings, timeout tuning, SSL issues, retry strategies, verbose debugging, and more.
How to fix 'Error acquiring the state lock', 'Error locking state', 'Failed to load backend', and other common Terraform state and backend errors. Covers force-unlock, DynamoDB lock tables, S3 backend issues, state file corruption, and provider version conflicts.
How to fix 'SSL certificate problem: unable to get local issuer certificate', 'CERT_HAS_EXPIRED', 'ERR_CERT_AUTHORITY_INVALID', and 'self signed certificate in certificate chain' errors in Git, curl, Node.js, Python, Docker, and more. Covers CA certificates, corporate proxies, Let's Encrypt, certificate chains, and self-signed certs.
How to fix 'mapping values are not allowed here', 'could not find expected :', 'did not find expected key', and other YAML indentation and syntax errors in Docker Compose, Kubernetes manifests, GitHub Actions, and config files.
How to fix Nginx 502 Bad Gateway errors caused by upstream server issues, wrong proxy_pass configuration, PHP-FPM socket problems, timeout settings, SELinux, Docker networking, and more.
How to fix Docker container 'Exited (137)', OOMKilled, and 'Killed' signal 9 errors caused by out-of-memory conditions in Docker, Docker Compose, and Kubernetes.
How to fix 'Unable to locate credentials', 'NoCredentialProviders: no valid providers in chain', and 'The security token included in the request is expired' errors in AWS CLI, SDKs, and applications running on EC2, ECS, Lambda, and Docker.
How to fix 'the connection to the server localhost:8080 was refused' and other kubectl connection errors when the Kubernetes API server is unreachable.