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.
Real developers can help you.
Franck Plazanet
I am a Strategic Engineering Leader with over 8 years of experience building high-availability enterprise systems and scaling high-performing technical teams. My focus is on bridging the gap between complex technology and business growth.
Core Expertise:
🚀 Leadership: Managing and coaching teams of 15+ engineers, fostering a culture of accountability and continuous improvement.
🏗️ Architecture: Enterprise Core Systems, Multi-system Integration (ERP/API/ETL), and Core Database Structure.
☁️ Cloud & Scale: AWS Expert; architected systems handling 10B+ monthly requests and managing 100k+ SKUs.
📈 Business Impact: Aligning tech strategy with P&L goals to drive $70k+ in monthly recurring revenue.
I thrive on "out-of-the-box" thinking to solve complex technical bottlenecks and am always looking for ways to use automation to improve business productivity.
Bastien Labelle
Full stack dev w/ 20+ years of experience
Matthew Butler
Systems Development Engineer @ Amazon Web Services
Jaime Orts-Caroff
I'm a Senior Android developer, open to work in various fields
BurnHavoc
Been around fixing other peoples code for 20 years.
Sage Fulcher
Hey I'm Sage! Im a Boston area software engineer who grew up in South Florida. Ive worked at a ton of cool places like a telehealth kidney care startup that took part in a billion dollar merger (Cricket health/Interwell health), a boutique design agency where I got to work on a ton of exciting startups including a photography education app, a collegiate Esports league and more (Philosophie), a data analytics as a service startup in Cambridge (MA) as well as at Phillips and MIT Lincoln Lab where I designed and developed novel network security visualizations and analytics. I've been writing code and furiously devoted to using computers to make people’s lives easier for about 17 years. My degree is in making computers make pretty lights and sounds. Outside of work I love hip hop, the Celtics, professional wrestling, magic the gathering, photography, drumming, and guitars (both making and playing them)
Caio Rodrigues
I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures.
I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations.
Beyond coding, I care about **software quality and architecture**, following best practices for componentization, code organization, and performance optimization.
I'm also comfortable working across the stack when needed, integrating APIs, handling business logic, and helping transform prototypes into production-ready systems.
My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.**
Omar Faruk
As a Product Engineer at Klasio, I contributed to end-to-end product development, focusing on scalability, performance, and user experience.
My work spanned building and refining core features, developing dynamic website templates, integrating secure and reliable payment gateways, and optimizing the overall system architecture.
I played a key role in creating a scalable and maintainable platform to support educators and learners globally.
I'm enthusiastic about embracing new challenges and making meaningful contributions.
Matthew Jordan
I've been working at a large software company named Kainos for 2 years, and mainly specialise in Platform Engineering. I regularly enjoy working on software products outside of work, and I'm a huge fan of game development using Unity. I personally enjoy Python & C# in my spare time, but I also specialise in multiple different platform-related technologies from my day job.
legrab
I'll fill this later
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
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).