DevOps

Overview The Docker/BuildKit error "failed to compute cache key: not found" usually means a COPY/ADD source path is missing from the build context. Common reasons include a too-aggressive .dockerignore, wrong build context......

Overview This guide shows how to diagnose and fix the Docker BuildKit error: failed to solve with frontend dockerfile.v0: failed to create LLB definition It typically means BuildKit couldn’t parse your Dockerfile, couldn’t build the......

What this error means Docker shows “ADD failed: stat … no such file or directory” (or in BuildKit, “failed to compute cache key: … no such file or directory”) when the source path you reference in ADD or COPY cannot be found. The source......

What this error means When building an image, Docker sends a “build context” (files under the chosen directory, minus anything excluded by .dockerignore). COPY can only read from that context. If the source path doesn’t exist in the......

Overview The error "port is already allocated" appears when Docker cannot bind a requested host port because another process (often another container) is already listening on it. This guide shows fast, practical ways to identify......

What this error means Docker tried to publish a container port on your host (0.0.0.0:PORT), but another process or container is already listening there. You must either free the port or choose a different mapping. Common message: Ports......

Overview The error “Error response from daemon: driver failed programming external connectivity” appears when Docker cannot publish a port on the host. Most cases boil down to a host port conflict, firewall/iptables rules blocking NAT, or......

Overview You’ll see this when trying to delete a named volume that one or more containers or services still reference: Error response from daemon: volume is in use and cannot be removed The fix is to find what is using the volume,......

What this error means Docker refuses to remove a volume if any container (running or stopped) references it. You’ll see: Error response from daemon: remove <volume>: volume is in use Fix it by identifying the referencing......

What this error means Docker refuses to remove a network while containers or tasks are still attached to it. The daemon reports: Error response from daemon: network <name_or_id> has active endpoints An "endpoint" is a......

Overview This guide shows practical ways to resolve Docker’s "Error response from daemon: network with name … already exists". You’ll quickly identify the existing network, decide whether to reuse it, remove it safely, or avoid......

What this error means Docker could not find a network by the name you referenced. This happens when: The network was never created, or it was pruned. The name is wrong (typo, wrong project name, or different Docker context). You are using......