Deploy your Docker app to Fly.io
Step-by-step deployment help for Docker apps on Fly.io. We fix Docker-specific deployment issues, configure Fly.io, and get your app live. From $19.
Docker issues we fix before deploying
Common Docker problems that affect Fly.io deployments.
Running as root user
Containers running processes as root, so a container breakout gives the attacker root access to the host system.
Secrets baked into image layers
API keys, database passwords, or .env files copied into the Docker image during build, permanently stored in image layers even if deleted later.
Bloated image size
Using full OS base images (ubuntu, node:latest) instead of slim or alpine variants, resulting in 1GB+ images that are slow to pull and deploy.
No multi-stage build
Build dependencies (compilers, dev packages) included in the production image, increasing size and attack surface.
Fly.io deployment issues we check for
Common Fly.io problems that break Docker apps in production.
Dockerfile missing or misconfigured
Fly.io requires a Dockerfile for deployment. AI tools that scaffold without one force flyctl to auto-generate a suboptimal Dockerfile that misses build steps.
Volume only available in a single region
Fly volumes are pinned to one region. Multi-region deployments try to access a volume that doesn't exist in other regions, causing crashes.
Machine restarts losing in-memory state
AI-generated apps store session data or caches in memory. Fly machines can restart or migrate, wiping all in-memory state without warning.
Internal DNS resolution failing between services
Services within a Fly organization communicate via <app>.internal hostnames, but AI-generated code hardcodes localhost or public URLs.
Start with a self-serve audit
Get a professional review of your Docker project before deploying to Fly.io.
External Security Scan
Black-box review of your public-facing app. No code access needed.
- OWASP Top 10 vulnerability check
- SSL/TLS configuration analysis
- Security header assessment
- Expert review within 24h
Code Audit
In-depth review of your source code for security, quality, and best practices.
- Security vulnerability analysis
- Code quality review
- Dependency audit
- Architecture review
- Expert + AI code analysis
Complete Bundle
Both scans in one package with cross-referenced findings.
- Everything in both products
- Cross-referenced findings
- Unified action plan
100% credited toward any paid service. Start with an audit, then let us fix what we find.
How it works
Tell us about your app
Share your project details and what you need help with.
Expert + AI audit
A human expert assisted by AI reviews your code within 24 hours.
Launch with confidence
We fix what needs fixing and stick around to help.
Frequently asked questions
How do I deploy a Docker app to Fly.io?
We handle Docker deployments to Fly.io end to end. Start with our code audit ($19) to identify deployment blockers specific to your Docker project, then we configure Fly.io, fix issues, and get your app live in production.
What Docker issues affect Fly.io deployments?
Docker projects commonly have running as root user and secrets baked into image layers. On Fly.io, these combine with dockerfile missing or misconfigured and volume only available in a single region to cause deployment failures.
Can SpringCode deploy my Docker project to Fly.io?
Yes. We specialize in deploying Docker applications to Fly.io. We audit your codebase for Docker-specific issues, configure Fly.io correctly, and handle the full deployment so your app runs reliably in production.
What does Docker deployment to Fly.io cost?
Our code audit ($19) identifies all Fly.io deployment blockers in your Docker project. Full deployment assistance is scoped with a fixed quote after the audit — no hourly billing or surprise charges.
Related resources
Other techs on Fly.io
Deploy Docker elsewhere
Need help deploying Docker to Fly.io?
Tell us about your project. We'll respond within 24 hours with a clear plan and fixed quote.