Eureka vs SkyDNS: What are the differences?

## Introduction
Eureka and SkyDNS are commonly used service discovery tools in microservices architecture. 

1. **Deployment**:
Eureka is typically deployed alongside other Netflix OSS components which can provide additional functionality like load balancing and circuit-breaking, while SkyDNS is more lightweight and designed for simple service discovery without additional features.

2. **Integration with Container Orchestration Platforms**:
Eureka has better integration with container orchestration platforms like Kubernetes, Docker Swarm, and Mesos, allowing services to register and discover each other seamlessly within these environments. SkyDNS might require additional configuration and setup for optimal integration in such platforms.

3. **Protocol Support**:
Eureka primarily uses REST for communication between clients and the service registry, while SkyDNS uses DNS-based service discovery where clients query a DNS server to resolve service names to IP addresses. This difference in protocols can affect how services communicate and discover each other.

4. **Scalability**:
Eureka is known for its ability to scale horizontally by adding more instances to handle a large number of service registrations and queries, making it suitable for large-scale deployments. Meanwhile, SkyDNS may face scalability challenges when dealing with a high volume of service discovery requests.

5. **Monitoring and Metrics**:
Eureka provides built-in monitoring and metrics capabilities, offering insights into the health and performance of the service registry, whereas SkyDNS may require additional tools or configurations for monitoring and metrics collection, potentially leading to more setup overhead.

6. **Community Support**:
Eureka has a robust community of users and contributors due to its association with Netflix, providing extensive documentation, support forums, and continuous updates. SkyDNS, while widely used, may have a smaller community and fewer resources available for troubleshooting and support.

In Summary, Eureka and SkyDNS differ in deployment options, integration with container orchestration platforms, protocol support, scalability, monitoring capabilities, and community support in the context of service discovery in microservices architecture.