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
ERROR: pip's dependency resolver does not currently take into account...conflicting versions for modulePackage not found in base imageBuild failed: E: Unable to locate package

Common Causes

  1. System package versions in Dockerfile conflict with application requirements
  2. Multi-stage build doesn't properly isolate dependencies between stages
  3. Package manager (npm, pip) not pinning minor versions, pulls breaking versions
  4. Base image updated, containing incompatible tool versions
  5. 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.

Real developers can help you.

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Frequently 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).

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