DevOps

Overview The Compose error “working directory is invalid, it needs to be an absolute path” occurs when a service’s working_dir (or the Docker run -w flag it maps to) is set to a relative or incorrectly formatted path. The value must be an......

What this error means You’ll see errors like: services.<name>.ports contains an invalid type, it should be an array services.*.ports contains an invalid type In the Compose spec, ports must be a list (array). A single string......

What this error means The message yaml: mapping values are not allowed in this context comes from the YAML parser, not Docker Compose itself. It appears when a colon (:) is interpreted as starting a key:value pair where YAML does not......

Overview “The Compose file is invalid” means your compose.yaml (or docker-compose.yml) violates the Compose file schema: wrong keys, wrong types, bad indentation, or unsupported features. This guide shows quick checks, a minimal working......

What this error means The message ERROR: Version in "docker-compose.yml" is unsupported appears when your Compose binary cannot parse the version declared in the file. This typically happens when: You are using legacy......

What this error means Docker Compose requires every service to specify how its container image is obtained. Each service must define one of: image: pull an existing image by name/tag build: build an image from a local context (and......

Overview These errors mean the build process can’t find your Dockerfile: Docker CLI: "open Dockerfile: no such file or directory" Docker Compose: "Cannot locate specified Dockerfile: Dockerfile" They occur due to......

Overview If you see errors like: You must be root to run Docker; or Got permission denied while trying to connect to the Docker daemon socket your user likely lacks permission to access the Docker daemon’s UNIX socket at......

Overview This guide resolves the Windows error message: "WSL distro is stopped" when Docker Desktop cannot start. You’ll diagnose WSL state, restart the right services, fix version/config mismatches, and safely reset Docker’s WSL......

Overview When Docker Desktop shows “WSL 2 backend stopped” on Windows, it usually means the WSL 2 runtime or the Docker-managed WSL distributions (docker-desktop, docker-desktop-data) failed to start. Common causes include missing Windows......

Overview Symptoms: docker run can’t reach the internet or other containers Errors like: "iptables: not found", or Docker logs show "failed to program iptables rules" DNS fails inside containers; publishing ports has no......

What this error means The error device or resource busy is raised by the OS when Docker tries to unmount a filesystem (a volume, bind mount, or overlay) that is still in use. Common causes: Another container still uses the volume or......