Consul vs SkyDNS: What are the differences?

# Introduction
This Markdown code provides a comparison of key differences between Consul and SkyDNS, two popular service discovery tools used in modern cloud environments.

1. **Protocol Support**: Consul supports both DNS and HTTP interfaces for service discovery, making it versatile for different applications and environments. SkyDNS, on the other hand, primarily relies on DNS for service discovery, which may limit its compatibility with certain protocols or applications.

2. **Consistency**: Consul uses a consistent key-value store to maintain service discovery data, ensuring that all nodes have the most up-to-date information. SkyDNS, while reliable, may face occasional consistency issues due to its distributed nature and reliance on DNS.

3. **Health Checking**: Consul provides built-in health checking functionalities, allowing services to check the status of their dependencies and react accordingly. SkyDNS lacks this native health checking feature, requiring additional tools or configurations for monitoring service health.

4. **Clustering**: Consul offers built-in clustering support, enabling easy scalability and high availability for service discovery across multiple nodes. SkyDNS, while capable of clustering, may require more manual configuration and management to achieve similar levels of scalability.

5. **WAN Federation**: Consul comes with robust WAN federation capabilities, facilitating service discovery across multiple data centers or cloud regions seamlessly. SkyDNS, on the other hand, may require additional configurations or extensions to achieve the same level of WAN federation.

6. **Community Support**: Consul has a larger and more active community of developers and users, providing extensive documentation, support, and resources for troubleshooting. SkyDNS, while widely used, may have a smaller community presence, leading to potential challenges in finding help or resources when needed.

In Summary, the key differences between Consul and SkyDNS lie in their protocol support, consistency, health checking capabilities, clustering features, WAN federation support, and community backing.