Claude Code
deployment
Docker Build Fails Due to Dependency Conflicts
Docker build succeeds locally but fails in CI/CD pipeline with dependency resolution errors. The Dockerfile installs system packages that conflict with application dependencies, or transitive dependencies pull incompatible versions.
This often only appears in CI/CD because local Docker daemon caches layers, masking the real issue.
Error Messages You Might See
ERROR: pip's dependency resolver does not currently take into account...
conflicting versions for module
Package not found in base image
Build failed: E: Unable to locate package
Common Causes
- System package versions in Dockerfile conflict with application requirements
- Multi-stage build doesn't properly isolate dependencies between stages
- Package manager (npm, pip) not pinning minor versions, pulls breaking versions
- Base image updated, containing incompatible tool versions
- Dockerfile doesn't use --no-cache flag, using stale cached layers in CI
How to Fix It
Pin exact versions in package managers and Dockerfile. Use specific base image versions (ubuntu:22.04 not ubuntu:latest). Separate build and runtime dependencies. Use docker build --no-cache in CI. Test Dockerfile on clean machine without cache. Use docker buildx to build on multiple architectures simultaneously.
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Get HelpFrequently Asked Questions
How to debug Docker build failures locally?
Run: docker build --no-cache --progress=plain . 2>&1 | tee build.log. No cache prevents cached layers from hiding issues.
Should base images have specific versions?
Yes. Use ubuntu:22.04 or python:3.11-slim not :latest. Latest causes non-deterministic builds.
When should dependencies be pinned?
Always pin in production builds. In development, allow minor version updates. Use lock files (package-lock.json, poetry.lock).