52 articles
RSSHow 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 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 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 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 docker-compose.override.yml not being applied — file naming, merge behavior, explicit file flags, environment-specific configs, and common override pitfalls.
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 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 Docker build and push errors — registry authentication, image tagging, layer caching, multi-platform builds, and GHCR vs Docker Hub setup.
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 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 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 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 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 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 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 .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.
How to fix Docker permission denied errors on mounted volumes caused by UID/GID mismatch, read-only mounts, or SELinux labels.
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 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.
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 the Kubernetes CrashLoopBackOff error when a pod repeatedly crashes and Kubernetes keeps restarting it with increasing back-off delays.
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.
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 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.
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 '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.
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 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.
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.
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.
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.
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.