Best WAF for Docker
Secure your Docker containers with the right WAF solution. Compare containerized WAFs, sidecar deployments, and cloud-based options for Docker, Docker Compose, and Docker Swarm.
Docker deployments require WAFs that can be easily containerized or deployed as sidecars alongside your application containers. The right solution depends on whether you're running standalone Docker, Docker Compose, or Docker Swarm.
Containerized WAFs have matured significantly, with multiple options available as official Docker images. From open-source solutions like BunkerWeb and ModSecurity to enterprise platforms from Wallarm and F5, Docker users have strong choices for protecting their containerized applications.
Top WAF Providers for Docker
Developer-friendly WAF using proprietary SmartParse technology, offering low false positives and seamless DevOps integration for modern application security.
AI-powered WAF with preemptive zero-day protection, featuring dual machine learning engines and minimal false positives for cloud-native applications.
Open-source, crowd-powered WAF that combines traditional rule-based filtering with community-driven threat intelligence. Integrates with Nginx, Traefik, HAProxy, and Kubernetes. Compatible with ModSecurity SecLang rules.
Enterprise CNAPP with integrated WAF, API security, and bot management, designed for cloud-native applications across multi-cloud environments.
API-first security platform combining cloud-native WAF, automated security testing, and advanced API abuse detection with real-time blocking capabilities.
High-performance WAF built into the world's most widely used open source load balancer. Uses machine learning-powered threat detection instead of regex-based signatures, delivering 98.5% balanced accuracy with sub-millisecond latency. Enterprise product with custom pricing.
OWASP open source WAF written in Go, fully compatible with ModSecurity rules and OWASP Core Rule Set, designed as a modern alternative to ModSecurity with native support for Caddy, Traefik, and HAProxy.
Lightweight, high-performance WAF running natively inside NGINX Plus. Brings F5's enterprise threat intelligence to DevOps workflows with declarative configuration, Kubernetes-native deployment, and CI/CD integration. Part of the NGINX One platform.
Machine learning-based open source WAF that uses contextual AI to detect threats without signatures or rules, with native integration for NGINX, Kong, Envoy, and Kubernetes ingress controllers.
Self-hosted open source WAF by Chaitin Tech featuring a semantic analysis engine for intelligent threat detection, with a web management UI and one-command Docker deployment.
Next-generation open source WAF built on NGINX with ModSecurity integration, offering comprehensive web security with an intuitive web UI and extensive plugin system.
The original open source WAF engine powering countless applications, offering unmatched flexibility for those willing to manage their own security infrastructure.
API gateway with built-in WAF plugin for enterprise customers. Kong is the most popular open source API gateway (35K+ GitHub stars, 312M+ downloads) built on NGINX, processing 400B+ API calls daily. The WAF plugin is an Enterprise-only add-on that protects API endpoints at the gateway layer.
Cloud-managed WAF from Qualys that integrates with their vulnerability scanning platform, enabling one-click virtual patching of discovered vulnerabilities. Note — product was decommissioned September 2024.
What to Look For in a WAF for Docker
Docker WAF requirements:
- Official Docker Image - Available as a well-maintained Docker image with regular security updates
- Resource Efficiency - Low memory and CPU footprint to minimize container overhead
- Environment Variables - Configuration via environment variables for 12-factor app compatibility
- Docker Compose - Easy integration in docker-compose.yml as a reverse proxy or sidecar service
- Health Checks - Docker health check support for orchestration and restart policies
- Log Drivers - Compatible with Docker logging drivers (json-file, syslog, fluentd) for centralized log management
Docker Considerations
Docker-specific considerations when deploying a WAF:
- Network Architecture - Use Docker networks to isolate your WAF container. Place it on a bridge network shared with your application containers, and only expose the WAF's ports externally.
- Volume Mounts - Mount WAF configuration files and rule sets as Docker volumes for persistence across container restarts.
- Resource Limits - Set memory and CPU limits on your WAF container to prevent resource exhaustion in the Docker host.
- Docker Swarm - For Swarm deployments, deploy the WAF as a global service or use routing mesh to ensure traffic passes through the WAF before reaching application services.
- Image Security - Use official images from trusted registries. Scan WAF images with tools like Trivy or Docker Scout before deployment.
Frequently Asked Questions
What is the best containerized WAF for Docker?
BunkerWeb is the most Docker-friendly WAF, offering official Docker images with a web UI, ModSecurity + OWASP CRS pre-configured, and native Docker Compose support. For enterprise needs, Wallarm and F5 NGINX App Protect also provide Docker images with more advanced features.
Should I run WAF as a sidecar or reverse proxy in Docker?
A reverse proxy WAF (separate container in front of your app) is simpler and protects all traffic entering your application. Sidecar deployment (one WAF per application container) provides tighter integration but increases resource usage. For most Docker Compose setups, a reverse proxy container is recommended.
Can I use a cloud WAF instead of a containerized one?
Yes. Cloud WAFs like Cloudflare require only a DNS change and protect your Docker application at the edge without any container changes. This is often the simplest approach, though it doesn't protect east-west traffic between containers.