Docker, DevOps & Infrastructure
199 articles in this category
Infrastructure errors are loud but cryptic — exit codes without context, networking failures three layers deep, permission denied messages that hide actual SELinux or AppArmor blocks. This hub helps you decode them.
Containers and orchestration get most of the attention here, but the section also covers raw Linux, web servers (Nginx, Apache), CI/CD pipelines, and cloud infra.
Recommended starting points:
- Docker Compose up errors — the dev-environment killer.
- Kubernetes ImagePullBackOff — pod stuck before it even runs.
- Nginx 502 Bad Gateway — the upstream-died classic.
Docker (52)
Fix: Fly.io Deploy Not Working — fly.toml, Machines, Volumes, Secrets, and Internal DNS
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.
Fix: Docker Compose Watch Not Working — sync vs rebuild, Ignore Patterns, WSL/macOS File Events
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.
Fix: Coolify Not Working — Deployment Failing, SSL Not Working, or Containers Not Starting
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.
Fix: Docker Secrets Not Working — BuildKit --secret Not Mounting, Compose Secrets Undefined, or Secret Leaking into Image
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.
Fix: Docker Compose Healthcheck Not Working — depends_on Not Waiting or Always Unhealthy
How to fix Docker Compose healthcheck issues — depends_on condition service_healthy, healthcheck command syntax, start_period, custom health scripts, and debugging unhealthy containers.
Fix: Docker Multi-Platform Build Not Working — buildx Fails, Wrong Architecture, or QEMU Error
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.
Fix: docker-compose.override.yml Not Working — Override File Ignored or Not Merged
How to fix docker-compose.override.yml not being applied — file naming, merge behavior, explicit file flags, environment-specific configs, and common override pitfalls.
Fix: Docker Build ARG Not Available — ENV Variables Missing at Runtime
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.
Fix: Docker HEALTHCHECK Failing — Container Marked Unhealthy Despite Running
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.
Fix: Docker Build Cache Invalidated — Slow Builds on Every Run
How to fix Docker layer cache being invalidated on every build — Dockerfile instruction order, COPY optimization, ARG vs ENV, BuildKit cache mounts, and .dockerignore.
Fix: GitHub Actions Docker Build and Push Failing
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.
Fix: AWS ECS Task Failed to Start
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.
Fix: Docker Compose Services Can't Connect to Each Other
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.
Fix: Docker Container Keeps Restarting
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.
Fix: Docker Multi-Stage Build COPY --from Failed
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.
Fix: AWS ECR Authentication Failed (docker login and push Errors)
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.
Fix: Docker Build ARG Not Available in RUN Commands
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.
Fix: Docker Compose Environment Variables Not Loading from .env File
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.
Fix: Docker Compose depends_on Not Waiting for Service to Be Ready
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.
Fix: Docker container health status unhealthy
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.
Fix: Docker build sending large build context / slow Docker build
How to fix Docker build sending large build context caused by missing .dockerignore, node_modules in context, large files, and inefficient Dockerfile layers.
Fix: Docker Build Cache Not Working - No Cache Being Used
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.
Fix: Docker Compose Service failed to build / ERROR building
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.
Fix: Docker container name already in use
How to fix Docker 'container name already in use by container' error caused by stopped containers, name conflicts, compose restarts, and stale container state.
Fix: Docker exec /entrypoint.sh: no such file or directory
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.
Fix: Cannot Connect to the Docker Daemon. Is the Docker Daemon Running?
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.
Fix: Docker exec format error
How to fix Docker exec format error caused by architecture mismatch (ARM vs x86), missing shebang line, wrong entrypoint, and multi-platform build issues.
Fix: Docker error: network has active endpoints
How to fix Docker 'network has active endpoints' error when removing networks, caused by running containers, stale endpoints, orphaned compose networks, and failed cleanups.
Fix: Docker Error: Bind for 0.0.0.0:PORT failed: port is already allocated
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.
Fix: Kubernetes ImagePullBackOff - Failed to Pull Image
How to fix the Kubernetes ImagePullBackOff and ErrImagePull errors when a pod fails to pull a container image from a registry.
Fix: Kubernetes Pod OOMKilled (Exit Code 137)
How to fix Kubernetes OOMKilled pod status caused by memory limit exceeded, container memory leaks, JVM heap misconfiguration, and resource requests/limits settings.
Fix: .env File Not Loading – dotenv Variables Are Undefined in Node.js, Python, or Docker
How to fix .env files not being loaded by dotenv, Next.js, Vite, Django, or Docker Compose, including wrong file path, missing dotenv.config(), and variable naming issues.
Fix: Docker Volume Permission Denied – Cannot Write to Mounted Volume
How to fix Docker permission denied errors on mounted volumes caused by UID/GID mismatch, read-only mounts, or SELinux labels.
Fix: Docker Pull Error – Image Not Found or Manifest Unknown
How to fix Docker errors like 'manifest for image not found', 'repository does not exist', or 'pull access denied' when pulling or running images.
Fix: Redis ECONNREFUSED – Connection Refused on localhost:6379
How to fix the Redis ECONNREFUSED error when your application cannot connect to the Redis server on localhost:6379 or a remote host. Covers Redis not running, wrong host/port, Docker networking, firewall, AUTH required, maxclients, and TLS configuration.
Fix: E: Unable to locate package (apt-get install on Ubuntu/Debian)
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.
Fix: Docker no space left on device (build, pull, or run)
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.
Fix: Kubernetes Pod CrashLoopBackOff (Back-off restarting failed container)
How to fix the Kubernetes CrashLoopBackOff error when a pod repeatedly crashes and Kubernetes keeps restarting it with increasing back-off delays.
Fix: MongoServerError: bad auth / MongoNetworkError: connect ECONNREFUSED / MongooseServerSelectionError
How to fix MongoDB 'MongoServerError: bad auth Authentication failed', 'MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017', and 'MongooseServerSelectionError' connection errors. Covers MongoDB not running, connection string format, Atlas network access, Docker networking, authentication, DNS/SRV issues, TLS/SSL, and Mongoose options.
Fix: Error: Process completed with exit code 1 (GitHub Actions)
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.
Fix: WRONGTYPE Operation against a key holding the wrong kind of value (Redis)
How to fix Redis errors: WRONGTYPE Operation against a key holding the wrong kind of value, MISCONF Redis is configured to save RDB snapshots, OOM command not allowed, READONLY You can't write against a read only replica, and other common Redis errors. Covers key type mismatches, disk issues, memory limits, eviction policies, connection problems, and serialization.
Fix: SSL certificate problem: unable to get local issuer certificate
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.
Fix: ERR_CONNECTION_REFUSED (localhost refused to connect)
How to fix 'ERR_CONNECTION_REFUSED', 'localhost refused to connect', and 'This site can't be reached' errors when accessing localhost in Chrome, Firefox, and Edge. Covers dev servers, port issues, 0.0.0.0 vs 127.0.0.1, Docker port mapping, WSL2, firewalls, and more.
Fix: YAML 'mapping values are not allowed here' and Other YAML Syntax Errors
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.
Fix: Nginx 502 Bad Gateway
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.
Fix: Docker Container Exited (137) OOMKilled / Killed Signal 9
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.
Fix: Access denied for user 'root'@'localhost' (MySQL ERROR 1045)
How to fix MySQL 'ERROR 1045 (28000): Access denied for user root@localhost (using password: YES/NO)' on Linux, macOS, Windows, and Docker. Covers password reset, auth plugin issues, skip-grant-tables recovery, MySQL 8 vs 5.7 differences, and host mismatches.
Fix: Unable to Locate Credentials (AWS CLI / SDK)
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.
Fix: The Connection to the Server localhost:8080 Was Refused (kubectl)
How to fix 'the connection to the server localhost:8080 was refused' and other kubectl connection errors when the Kubernetes API server is unreachable.
Fix: Docker COPY Failed: File Not Found in Build Context
How to fix 'COPY failed: file not found in build context', 'failed to read dockerfile', 'failed to calculate checksum', and other Docker build errors caused by missing files.
Fix: process.env.VARIABLE_NAME Is Undefined (Node.js, React, Next.js, Vite)
How to fix 'process.env.VARIABLE_NAME is undefined' and environment variables not loading from .env files in Node.js, React, Next.js, Vite, and Docker.
Fix: Docker Permission Denied While Trying to Connect to the Docker Daemon Socket
How to fix the 'permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock' error on Linux, WSL2, macOS, and CI.
Kubernetes (17)
Fix: ArgoCD Not Working — OutOfSync, Sync Waves, RBAC, Helm/Kustomize, and Webhook Setup
How 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.
Fix: Helm Not Working — Release Already Exists, Stuck Upgrade, and Values Not Applied
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.
Fix: Kubernetes HPA Not Scaling — HorizontalPodAutoscaler Shows Unknown or Doesn't Scale
How to fix Kubernetes HorizontalPodAutoscaler issues — metrics-server not installed, CPU requests not set, unknown metrics, scale-down delay, custom metrics, and KEDA.
Fix: Kubernetes Secret Not Mounted — Pod Cannot Access Secret Values
How to fix Kubernetes Secrets not being mounted — namespace mismatches, RBAC permissions, volume mount configuration, environment variable injection, and secret decoding issues.
Fix: Kubernetes Pod OOMKilled — Out of Memory Error
How to fix Kubernetes OOMKilled errors — understanding memory limits, finding memory leaks, setting correct resource requests and limits, and using Vertical Pod Autoscaler.
Fix: Kubernetes ConfigMap Changes Not Reflected in Running Pods
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.
Fix: Kubernetes Ingress Not Working (404, 502, or Traffic Not Routing)
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.
Fix: Kubernetes exceeded quota / Pod Stuck in Pending Due to Resource Quota
How to fix Kubernetes 'exceeded quota' errors — pods stuck in Pending because namespace resource quotas are exhausted, missing resource requests, and LimitRange defaults.
Fix: kubectl apply error validating / is invalid
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.
Fix: Kubernetes ImagePullBackOff - Failed to Pull Image
How to fix the Kubernetes ImagePullBackOff and ErrImagePull errors when a pod fails to pull a container image from a registry.
Fix: Kubernetes Pod OOMKilled (Exit Code 137)
How to fix Kubernetes OOMKilled pod status caused by memory limit exceeded, container memory leaks, JVM heap misconfiguration, and resource requests/limits settings.
Fix: Kubernetes Pod stuck in Pending state
How to fix Kubernetes Pod stuck in Pending state caused by insufficient resources, unschedulable nodes, PVC issues, node selectors, taints, and resource quotas.
Fix: kubectl – The Connection to the Server Was Refused or Context Not Found
How to fix kubectl errors like 'connection refused', 'context not found', or 'unable to connect to the server' when managing Kubernetes clusters.
Fix: Kubernetes Pod CrashLoopBackOff (Back-off restarting failed container)
How to fix the Kubernetes CrashLoopBackOff error when a pod repeatedly crashes and Kubernetes keeps restarting it with increasing back-off delays.
Fix: YAML 'mapping values are not allowed here' and Other YAML Syntax Errors
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.
Fix: Docker Container Exited (137) OOMKilled / Killed Signal 9
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.
Fix: The Connection to the Server localhost:8080 Was Refused (kubectl)
How to fix 'the connection to the server localhost:8080 was refused' and other kubectl connection errors when the Kubernetes API server is unreachable.
Web Servers (12)
Fix: nginx Upstream Load Balancing Not Working — All Traffic Hitting One Server
How to fix nginx load balancing issues — upstream block configuration, health checks, least_conn vs round-robin, sticky sessions, upstream timeouts, and SSL termination.
Fix: Certbot Certificate Renewal Failed (Let's Encrypt)
How to fix Certbot certificate renewal failures — domain validation errors, port 80 blocked, nginx config issues, permissions, and automating renewals with systemd or cron.
Fix: Kubernetes Ingress Not Working (404, 502, or Traffic Not Routing)
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.
Fix: Nginx WebSocket Proxy Not Working (101 Switching Protocols Failed)
How to fix Nginx WebSocket proxying not working — 101 Switching Protocols fails, connections drop after 60 seconds, missing Upgrade headers, and SSL WebSocket configuration.
Fix: Nginx location Block Not Matching (Wrong Route Served)
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.
Fix: Nginx 413 Request Entity Too Large
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.
Fix: Nginx 504 Gateway Timeout
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.
Fix: Nginx SSL: error:0A00006C:SSL routines::bad key / SSL handshake failed
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.
Fix: Nginx upstream timed out (110: Connection timed out) while reading response header
How to fix Nginx upstream timed out error caused by slow backend responses, proxy timeout settings, PHP-FPM hangs, and upstream server configuration issues.
Fix: Apache 500 Internal Server Error
Resolve Apache's 500 Internal Server Error by checking error logs, fixing .htaccess rules, correcting file permissions, and debugging PHP/CGI configuration.
Fix: Nginx 403 Forbidden – Permission Denied or Directory Index Disabled
How to fix the Nginx 403 Forbidden error caused by file permissions, missing index files, SELinux, or incorrect root path configuration.
Fix: Nginx 502 Bad Gateway
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.
Git & Version Control (28)
Fix: Lefthook Not Working — Install, Staged Files, Glob Filters, Parallel Runs, and CI Skip
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.
Fix: gh CLI Not Working — Auth Scopes, Multiple Accounts, PR Create Errors, and Enterprise Hosts
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.
Fix: Git Worktree Not Working — Branch Already Checked Out, Prune, Submodules, and Locked Worktrees
How to fix git worktree errors — fatal: 'branch' is already checked out at, worktree prune removing valid trees, detached HEAD on add, submodules not initialized, moving/locking worktrees, and ignoring per-worktree files.
Fix: DVC Not Working — Remote Push Errors, Pipeline DAG Issues, and Git Integration
How to fix DVC errors — dvc push authentication failed, dvc pull file missing, pipeline stage not reproducing, cache out of disk space, dvc add vs dvc stage, conflict with git LFS, and S3/GCS remote setup.
Fix: Git Hooks Not Running — Husky Not Working, pre-commit Skipped, or lint-staged Failing
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.
Fix: Git Keeps Asking for Username and Password
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.
Fix: Undo git reset --hard and Recover Lost Commits
How to undo git reset --hard and recover lost commits using git reflog — step-by-step recovery for accidentally reset branches, lost work, and dropped stashes.
Fix: .gitignore Not Working (Files Still Being Tracked)
How to fix .gitignore not working — files still showing in git status after being added to .gitignore, caused by already-tracked files, wrong syntax, nested gitignore rules, and cache issues.
Fix: git fatal: A branch named 'x' already exists
How to fix 'git fatal: A branch named already exists' when creating or renaming branches — including local conflicts, remote tracking branches, and worktree issues.
Fix: Git submodule update failed / fatal: not a git repository
Resolve Git submodule update and init failures including 'fatal: not a git repository', path conflicts, URL mismatches, shallow clone issues, and CI/CD checkout problems.
Fix: Git "cannot lock ref" – Unable to Create Lock File
How to fix the Git error 'cannot lock ref: Unable to create .git/refs/heads/branch-name.lock' caused by stale lock files, case conflicts, packed-refs corruption, and concurrent operations.
Fix: git cherry-pick error: could not apply commit (conflict)
How to fix git cherry-pick conflict errors caused by diverged branches, overlapping changes, missing context, renamed files, and merge commits.
Fix: error: failed to push some refs to remote
How to fix Git error 'failed to push some refs' caused by diverged branches, remote changes, protected branches, authentication failures, and pre-push hooks.
Fix: git error: src refspec 'main' does not match any
How to fix git error src refspec main does not match any caused by empty repos, wrong branch name, no commits, typos, and default branch mismatch.
Fix: Git fatal: not a valid object name: 'main'
How to fix Git fatal not a valid object name error caused by empty repositories, wrong branch names, missing initial commits, and corrupted refs.
Fix: Git remote rejected — file exceeds GitHub's file size limit of 100.00 MB
Resolve the GitHub push error when a file exceeds the 100 MB size limit by removing the large file from history, using Git LFS, or cleaning your repository with BFG Repo Cleaner.
Fix: Git "Your local changes would be overwritten by merge"
How to fix Git error 'Your local changes to the following files would be overwritten by merge' using git stash, commit, checkout, and pull strategies.
Fix: fatal: remote origin already exists
How to fix the 'fatal: remote origin already exists' error in Git by updating the remote URL, removing and re-adding origin, managing multiple remotes, and handling forked repos.
Fix: Git LFS Smudge Filter Error
Resolve Git LFS smudge filter errors by installing Git LFS, fixing credentials, resetting LFS hooks, and handling bandwidth or storage quota issues.
Fix: Git Rebase Conflict – How to Resolve Conflicts and Continue or Abort
How to resolve conflicts during git rebase, use rebase --continue, --abort, or --skip, and avoid common rebase pitfalls.
Fix: Git Detached HEAD State – How to Reattach and Save Your Work
How to fix Git's detached HEAD state, reattach to a branch, and recover commits made while in detached HEAD.
Fix: CONFLICT (content): Merge conflict in file — fix conflicts and then commit the result
How to fix Git merge conflicts during merge, rebase, cherry-pick, and pull — resolve conflict markers, use merge tools, accept theirs or ours, abort, and prevent future conflicts.
Fix: fatal: not a git repository (or any of the parent directories): .git
How to fix the 'fatal: not a git repository' error in Git by checking your working directory, initializing a repo, recovering a deleted .git folder, and resolving submodule, CI/CD, and IDE path issues.
Fix: git stash pop – CONFLICT, local changes would be overwritten, no stash entries found
How to fix git stash errors: 'CONFLICT' after git stash pop, 'Your local changes to the following files would be overwritten', 'No stash entries found', and 'Could not restore untracked files from stash entry'. Covers stash pop vs apply, conflict resolution, recovering dropped stashes, and stashing untracked files.
Fix: SSL certificate problem: unable to get local issuer certificate
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.
Fix: Permission denied (publickey) – Git SSH Authentication Failed
How to fix '[email protected]: Permission denied (publickey)' and 'fatal: Could not read from remote repository' when pushing or cloning over SSH. Covers key generation, ssh-agent, GitHub/GitLab setup, and edge cases.
Fix: git push rejected – non-fast-forward error
How to fix 'error: failed to push some refs' and '! [rejected] main -> main (non-fast-forward)' in Git. Covers pull, rebase, force push, and edge cases.
Fix: fatal: refusing to merge unrelated histories
How to fix the Git error 'fatal: refusing to merge unrelated histories' when pulling, merging, or rebasing branches that don't share a common ancestor.
CI/CD (20)
Fix: ArgoCD Not Working — OutOfSync, Sync Waves, RBAC, Helm/Kustomize, and Webhook Setup
How 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.
Fix: gh CLI Not Working — Auth Scopes, Multiple Accounts, PR Create Errors, and Enterprise Hosts
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.
Fix: Nox Not Working — Session Errors, Virtualenv Backends, and Reuse Logic
How to fix Nox errors — no noxfile.py found, session not detected, virtualenv backend uv not installed, session.install fails outside virtualenv, parametrize matrix exploding, and reuse_venv confusion.
Fix: Tox Not Working — Environment Creation, Config Errors, and Multi-Python Testing
How to fix Tox errors — ERROR cannot find Python interpreter, tox.ini config parsing error, allowlist_externals required, recreating environments slow, pyproject.toml integration, and matrix env selection.
Fix: Turborepo Not Working — Cache Never Hits, Pipeline Not Running, or Workspace Task Fails
How to fix Turborepo issues — turbo.json pipeline configuration, cache keys, remote caching setup, workspace filtering, and common monorepo task ordering mistakes.
Fix: Docker Multi-Platform Build Not Working — buildx Fails, Wrong Architecture, or QEMU Error
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.
Fix: GitHub Actions Artifacts Not Working — Upload Fails, Download Empty, or Artifact Not Found
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.
Fix: GitHub Actions Reusable Workflow Not Working — Inputs Not Passed or Secrets Not Available
How to fix GitHub Actions reusable workflow issues — workflow_call trigger, passing inputs and secrets, output variables, caller vs called permissions, and common errors.
Fix: GitHub Actions Job Timeout — Workflow Cancelled or Stuck After 6 Hours
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.
Fix: GitHub Actions Secret Not Available — Environment Variable Empty in Workflow
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.
Fix: GitHub Actions Matrix Strategy Not Working — Jobs Not Running or Failing
How to fix GitHub Actions matrix strategy issues — matrix expansion, include/exclude patterns, failing fast, matrix variable access, and dependent jobs with matrix outputs.
Fix: GitHub Actions Docker Build and Push Failing
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.
Fix: GitHub Actions Environment Variables Not Available Between Steps
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.
Fix: AWS ECR Authentication Failed (docker login and push Errors)
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.
Fix: GitHub Actions if Condition Not Working (Steps and Jobs Being Skipped or Always Running)
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.
Fix: GitHub Actions Cache Not Working (Cache Miss on Every Run)
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.
Fix: GitHub Actions Runner Failed to Start or Connect
Fix GitHub Actions self-hosted runner failures including connection issues, version mismatches, and registration problems with step-by-step solutions.
Fix: GitHub Actions permission denied (EACCES, 403, or Permission to X denied)
How to fix GitHub Actions permission denied errors caused by GITHUB_TOKEN permissions, checkout issues, artifact access, npm/pip cache, and Docker socket access.
Fix: Error: Process completed with exit code 1 (GitHub Actions)
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.
Fix: YAML 'mapping values are not allowed here' and Other YAML Syntax Errors
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.
Cloud & Deployment (45)
Fix: AWS Amplify Not Working — Gen 2 Backend, defineData, Auth, Storage, and Sandbox Deployments
How to fix AWS Amplify Gen 2 errors — backend.ts file structure, defineData schema authorization, defineAuth flow, defineStorage bucket access, sandbox vs branch deploy, generated outputs, and Cognito triggers.
Fix: AWS Bedrock Not Working — Model Access, IAM, Converse API, Streaming, and Cross-Region
How to fix AWS Bedrock errors — AccessDeniedException for model access, bedrock vs bedrock-runtime client, Converse vs InvokeModel API, streaming with ConverseStream, regional availability, and Knowledge Bases setup.
Fix: AWS Lambda SnapStart Not Working — Version vs Alias, Restore Hooks, and Uniqueness Bugs
How to fix Lambda SnapStart errors — feature requires published version, $LATEST not supported, restore hook for stale connections, UUID collisions after snapshot, time-based state staleness, and pricing surprises.
Fix: AWS RDS Proxy Not Working — Endpoint, IAM Auth, Connection Pinning, and Lambda VPC
How to fix AWS RDS Proxy errors — IAM authentication token mismatch, connection pinning blocking reuse, Lambda VPC routing, Secrets Manager rotation, max_connections, read/write splitter, and TLS requirement.
Fix: AWS Step Functions Not Working — ASL Syntax, Map State, Error Handling, and IAM
How to fix AWS Step Functions errors — Amazon States Language syntax, Standard vs Express workflows, Distributed Map for large datasets, Retry/Catch error handling, Lambda invoke optimization, and IAM execution role permissions.
Fix: BigQuery Not Working — Partitioning, Slots, Streaming Inserts, and Cost Surprises
How to fix BigQuery errors — query scans full table without partition filter, slot contention with on-demand pricing, streaming insert quota exceeded, DML row limits, service account auth, and INFORMATION_SCHEMA for monitoring.
Fix: Cloudflare Pages Not Working — Build Output, Functions Routing, _redirects, and Bindings
How to fix Cloudflare Pages errors — build output directory mismatch, Functions in /functions/, _redirects vs _headers, compatibility flags, env per branch, D1/R2/KV bindings, and Direct Upload alternatives.
Fix: Fly.io Deploy Not Working — fly.toml, Machines, Volumes, Secrets, and Internal DNS
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.
Fix: Modal Not Working — App vs Stub, Image Build, Volumes, GPU Selection, and Cold Starts
How to fix Modal Labs errors — modal.App vs modal.Stub deprecation, image dependencies missing, Volume vs NetworkFileSystem, GPU type mismatch, .remote vs .local invocation, web endpoint URL, and cold start tuning.
Fix: Pulumi Not Working — Output<T>, Stack References, Secrets, State Backend, and Preview vs Up
How to fix Pulumi errors — Output<T> can't be unwrapped synchronously, stack reference not found, secret leaks in stack outputs, state backend lock, ResourceOptions parent missing, and refresh drift.
Fix: Moto Not Working — Mock Decorator, Real AWS Calls Leaking, and v4 to v5 Migration
How to fix Moto errors — mock not activating, real AWS credentials used in tests, ImportError mock_s3 removed in v5, fixtures with multiple services, NoCredentialsError despite mock, and standalone server mode.
Fix: Gunicorn Not Working — Worker Timeout, Boot Errors, and Signal Handling
How to fix Gunicorn errors — WORKER TIMEOUT killed, ImportError cannot import app, worker class not found, connection refused 502 behind nginx, graceful reload not working, and sync vs async worker selection.
Fix: ONNX Not Working — Conversion Errors, Runtime Provider Issues, and Dynamic Shape Problems
How to fix ONNX errors — torch.onnx.export unsupported operator, ONNX Runtime CUDA provider not found, InvalidArgument input shape mismatch, dynamic axes not working, IR version mismatch, and opset version conflicts.
Fix: Uvicorn Not Working — Worker Errors, Reload Issues, and Production Deployment
How to fix Uvicorn errors — Address already in use port binding, reload not detecting changes, SSL certificate errors, worker class with gunicorn, WebSocket disconnect, graceful shutdown, and proxy headers behind nginx.
Fix: AWS CDK Not Working — Bootstrap Error, ROLLBACK_COMPLETE, and Deploy Failures
How to fix AWS CDK errors — cdk bootstrap required, stack in ROLLBACK_COMPLETE, asset bundling failed, CLI/library version mismatch, VPC lookup failing, and cross-stack export conflicts.
Fix: Coolify Not Working — Deployment Failing, SSL Not Working, or Containers Not Starting
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.
Fix: SST Not Working — Deploy Failing, Bindings Not Linking, or Lambda Functions Timing Out
How to fix SST (Serverless Stack) issues — resource configuration with sst.config.ts, linking resources to functions, local dev with sst dev, database and storage setup, and deployment troubleshooting.
Fix: AWS Lambda Layer Not Working — Module Not Found or Layer Not Applied
How to fix AWS Lambda Layer issues — directory structure, runtime compatibility, layer ARN configuration, dependency conflicts, size limits, and container image alternatives.
Fix: AWS SQS Not Working — Messages Not Received, Duplicate Processing, or DLQ Filling Up
How to fix AWS SQS issues — visibility timeout, message not delivered, duplicate messages, Dead Letter Queue configuration, FIFO queue ordering, and Lambda trigger problems.
Fix: Terraform Import Error — Resource Not Importable or State Conflict
How to fix Terraform import errors — terraform import syntax, import blocks (Terraform 1.5+), state conflicts, provider-specific import IDs, and importing existing infrastructure.
Fix: AWS Lambda Environment Variable Not Set — undefined or Missing at Runtime
How to fix AWS Lambda environment variables not available — Lambda console config, CDK/SAM/Terraform setup, secrets from SSM Parameter Store, encrypted variables, and local testing.
Fix: AWS S3 CORS Error — Access to Fetch Blocked by CORS Policy
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.
Fix: Vue Router 404 on Page Refresh — History Mode Returns 404 or Blank Page
How to fix Vue Router 404 errors on page refresh in history mode — server configuration for nginx, Apache, Vite, Express, and Netlify, plus hash mode as a fallback.
Fix: AWS Access Denied — IAM Permission Errors and Policy Debugging
How to fix AWS Access Denied errors — understanding IAM policies, using IAM policy simulator, fixing AssumeRole errors, resource-based policies, and SCPs blocking actions.
Fix: Terraform Variable Not Set — No Value for Required Variable
How to fix Terraform 'no value for required variable' errors — variable definition files, environment variables, tfvars files, sensitive variables, and variable precedence.
Fix: Terraform Error Acquiring State Lock — State Lock Conflict
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.
Fix: AWS ECS Task Failed to Start
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.
Fix: AWS CloudWatch Logs Not Appearing
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.
Fix: AWS ECR Authentication Failed (docker login and push Errors)
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.
Fix: AWS RDS Connection Timed Out from Lambda or EC2
How to fix AWS RDS connection timeout errors from Lambda functions and EC2 instances — security group configuration, VPC settings, connection pooling, and RDS Proxy setup for Lambda.
Fix: AWS Lambda Cold Start Timeout and Slow First Invocation
How to fix AWS Lambda cold start timeouts and slow first invocations — provisioned concurrency, reducing package size, connection reuse, and language-specific optimizations.
Fix: AWS EC2 SSH Connection Refused or Timed Out
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.
Fix: Heroku H10 App Crashed Error
Fix the Heroku H10 App Crashed error by fixing your Procfile, PORT binding, missing dependencies, and build scripts with step-by-step solutions.
Fix: Vercel Deployment Failed - Common Causes and Solutions
Fix Vercel deployment failures caused by build errors, environment variables, serverless function limits, and dependency issues with step-by-step solutions.
Fix: AWS Lambda Unable to import module / Runtime.ImportModuleError
How to fix the AWS Lambda Runtime.ImportModuleError and Unable to import module error caused by wrong handler paths, missing dependencies, layer issues, and packaging problems.
Fix: AWS CloudFormation stack in ROLLBACK_COMPLETE or CREATE_FAILED state
How to fix AWS CloudFormation ROLLBACK_COMPLETE and CREATE_FAILED errors caused by IAM permissions, resource limits, invalid parameters, and dependency failures.
Fix: AWS AccessDeniedException when calling an AWS service operation
How to fix AWS AccessDeniedException caused by missing IAM permissions, explicit denies, SCPs, resource policies, permission boundaries, and misconfigured roles.
Fix: AWS Lambda Task timed out after X seconds
How to fix AWS Lambda timeout errors caused by low timeout settings, cold starts, slow external API calls, VPC configuration, and unoptimized code.
Fix: Terraform Error locking state: Error acquiring the state lock
How to fix Terraform state lock error caused by concurrent runs, crashed operations, DynamoDB lock table issues, and stale lock IDs.
Fix: Terraform Error: Reference to undeclared resource / unsupported attribute
How to fix Terraform plan errors including reference to undeclared resource, unsupported attribute, undeclared variable, and unknown module output.
Fix: Terraform Error: Resource already exists
How to fix Terraform resource already exists error caused by out-of-band changes, state drift, import issues, duplicate resource blocks, and failed destroys.
Fix: AWS S3 Access Denied (403 Forbidden) when uploading, downloading, or listing
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.
Fix: Terraform Failed to install provider (or Failed to query available provider packages)
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.
Fix: Error Acquiring the State Lock (Terraform)
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.
Fix: Unable to Locate Credentials (AWS CLI / SDK)
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.
More in this category (46)
Fix: Bun Shell Not Working — $ Template Quoting, Pipes, Exit Codes, and Cross-Platform Scripts
How to fix Bun Shell errors — $ template auto-escape vs raw strings, piping with pipe() vs |, throws on non-zero exit, cwd/env scoping, glob expansion differences, and Windows path handling.
Fix: direnv Not Working — Hook Activation, .envrc Allow, Layouts, and Editor Integration
How to fix direnv errors — hook not loaded in shell, .envrc blocked until allow, layout python venv not activated, dotenv loader, environment leaking to parent dirs, and VS Code/JetBrains direnv integration.
Fix: Electron Forge Not Working — Makers, Code Signing, Native Modules, and Publishers
How to fix Electron Forge errors — forge.config.js makers per OS, code signing on macOS (notarytool) and Windows, native module rebuild via electron-rebuild, Vite/Webpack plugin, auto-updater, and GitHub publisher.
Fix: NATS Not Working — Connection Auth, JetStream Streams, Consumer Ack, and Subject Wildcards
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.
Fix: Valkey Not Working — Redis Client Compatibility, ACL, Cluster Mode, and Migration
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.
Fix: HTTPie Not Working — JSON Body, Authentication, and Session Errors
How to fix HTTPie errors — installation collision with httpie-cli, JSON body interpretation, multipart form data, OAuth bearer token, persistent sessions, SSL verification skip, and download mode.
Fix: Click Not Working — Group Setup, Context Passing, and Parameter Type Errors
How to fix Click errors — UsageError missing argument, Group has no command, ctx.obj not passing between commands, ParamType validation failed, BadOptionUsage no such option, pass_context required, and lazy loading groups.
Fix: Rich Not Working — Live Display Issues, Color in CI, and Console Configuration
How to fix Rich errors — colors not appearing in CI logs, Live display flickering, progress bar not updating, table column overflow, traceback install conflicts, and Console redirect issues.
Fix: Typer Not Working — Argument Errors, Autocomplete, and Subcommand Issues
How to fix Typer errors — type annotation required error, Optional argument parsing, boolean flag conventions, autocomplete installation failed, nested commands not found, and rich traceback disable.
Fix: Clack Not Working — Prompts Not Displaying, Spinners Stuck, or Cancel Not Handled
How to fix @clack/prompts issues — interactive CLI prompts, spinners, multi-select, confirm dialogs, grouped tasks, cancellation handling, and building CLI tools with beautiful output.
Fix: esbuild Not Working — Plugin Errors, CSS Not Processed, or Output Missing After Build
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.
Fix: Python Packaging Not Working — Build Fails, Package Not Found After Install, or PyPI Upload Errors
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.
Fix: Celery Beat Not Working — Scheduled Tasks Not Running or Beat Not Starting
How to fix Celery Beat issues — beat scheduler not starting, tasks not executing on schedule, timezone configuration, database scheduler, and running beat with workers.
Fix: MySQL Replication Not Working — Replica Lag, Stopped Replication, or GTID Errors
How to fix MySQL replication issues — SHOW REPLICA STATUS errors, relay log corruption, GTID configuration, replication lag, skipping errors, and replica promotion.
Fix: Redis Cluster Not Working — MOVED, CROSSSLOT, or Connection Errors
How to fix Redis Cluster errors — MOVED redirects, CROSSSLOT multi-key operations, cluster-aware client setup, hash tags for key grouping, and failover handling.
Fix: Ruby Bundler Version Conflict — Gemfile Requirements Could Not Be Resolved
How to fix Ruby Bundler gem version conflicts — Gemfile.lock resolution, platform-specific gems, bundle update strategies, conflicting transitive dependencies, and Bundler version issues.
Fix: Redis Pub/Sub Not Working — Messages Not Received by Subscribers
How to fix Redis Pub/Sub issues — subscriber not receiving messages, channel name mismatches, connection handling, pattern subscriptions, and scaling with multiple processes.
Fix: Celery Task Not Executing — Worker Not Processing Tasks
How to fix Celery tasks not executing — worker configuration, broker connection issues, task routing, serialization errors, and debugging stuck or lost tasks.
Fix: Linux OOM Killer Killing Processes (Out of Memory)
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.
Fix: PostgreSQL "sorry, too many clients already"
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.
Fix: Elasticsearch index_not_found_exception (Index Does Not Exist)
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.
Fix: Linux No Space Left on Device (Disk Full Error)
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.
Fix: EMFILE Too Many Open Files / ulimit Error on Linux
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.
Fix: Cron Job Not Running on Linux
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.
Fix: Webpack HMR (Hot Module Replacement) Not Working
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.
Fix: sudo: command not found on Linux
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.
Fix: VS Code Remote SSH Could Not Establish Connection
How to fix VS Code Remote SSH 'Could not establish connection' errors — caused by missing server files, SSH config issues, firewall blocks, and VS Code Server installation failures.
Fix: PowerShell Script Cannot Be Loaded Because Running Scripts Is Disabled
How to fix 'cannot be loaded because running scripts is disabled on this system' in PowerShell by changing the execution policy with Set-ExecutionPolicy, fixing Group Policy restrictions, and bypassing for single scripts.
Fix: bash: command not found
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.
Fix: pip error: no such option: --break-system-packages
How to fix pip error no such option --break-system-packages caused by old pip versions, PEP 668 externally-managed environments, and virtual environment setup on modern Linux distributions.
Fix: Python PermissionError: [Errno 13] Permission denied
How to fix Python PermissionError Errno 13 Permission denied when reading, writing, or executing files, covering file permissions, ownership, virtual environments, Windows locks, and SELinux.
Fix: Segmentation fault (core dumped) in Linux / C / C++
How to fix the 'Segmentation fault (core dumped)' error in Linux, covering null pointer dereference, buffer overflow, use-after-free, stack overflow, and debugging with GDB, Valgrind, and AddressSanitizer.
Fix: SSH Permission denied (publickey,password)
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.
Fix: systemctl Service Failed to Start – Unit Entered Failed State
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.
Fix: Ansible UNREACHABLE – Failed to Connect to the Host via SSH
How to fix Ansible UNREACHABLE errors caused by SSH connection failures, wrong credentials, host key issues, or Python interpreter problems on remote hosts.
Fix: PostgreSQL Connection Refused – Could Not Connect to Server
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.
Fix: SSH Connection Timed Out or Connection Refused
How to fix SSH errors like 'Connection timed out', 'Connection refused', or 'No route to host' when connecting to remote servers.
Fix: EACCES: permission denied, mkdir / open / unlink (Node.js)
How to fix EACCES permission denied errors in Node.js for mkdir, open, unlink, and scandir operations, covering npm global installs, Docker, NVM, CI/CD, and filesystem permissions.
Fix: MySQL ERROR 2002 (HY000): Can't connect to local MySQL server through socket
How to fix MySQL ERROR 2002 (HY000) when the MySQL client can't connect through the Unix socket file on Linux, macOS, Docker, and WSL.
Fix: ENOSPC: System limit for number of file watchers reached
How to fix the ENOSPC file watchers error on Linux by increasing the inotify watch limit, configuring VS Code, optimizing watched files, and handling Docker/WSL edge cases.
Fix: python: command not found (or python3: No such file or directory)
How to fix 'python: command not found', 'python3: command not found', and wrong Python version errors on Linux, macOS, Windows, and Docker. Covers PATH, symlinks, pyenv, update-alternatives, Homebrew, and more.
Fix: curl: (7) Failed to connect / (6) Could not resolve host / (28) Operation timed out
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.
Fix: ERROR: Could not build wheels / Failed building wheel (pip)
How to fix pip 'ERROR: Could not build wheels', 'Failed building wheel', 'No matching distribution found', and 'error: subprocess-exited-with-error'. Covers missing C compilers, build tools, system libraries, Python version issues, pre-built wheels, and platform-specific fixes for Linux, macOS, and Windows.
Fix: bash: ./script.sh: Permission denied (Linux, macOS, WSL)
How to fix 'Permission denied' errors in bash, including chmod +x for scripts, file ownership with chown, EACCES in Node.js, Docker volume permissions, SELinux, ACLs, and WSL issues.
Fix: error: externally-managed-environment (pip install)
How to fix the 'error: externally-managed-environment' and 'This environment is externally managed' error when running pip install on Python 3.11+ on Ubuntu, Debian, Fedora, and macOS.
Fix: EACCES permission denied when installing npm packages globally
How to fix 'Error: EACCES: permission denied, access /usr/local/lib/node_modules' when running npm install -g on macOS or Linux. Multiple solutions ranked by recommendation.