Consul by HashiCorp is described as 'Highly available, distributed, multi datacenter service discovery system with key/value store and health checking'. There are six alternatives to Consul by HashiCorp for a variety of platforms, including Linux, Online / Web-based, Windows, Mac and Self-Hosted solutions. The best alternative is Kubernetes, which is both free and Open Source. Other great apps like Consul by HashiCorp are StackGres (Free, Open Source), Apache ZooKeeper (Free, Open Source), Service Fabric (Free, Open Source) and Cycle.io (Freemium).
Apache ZooKeeper is an effort to develop and maintain an open-source server which enables highly reliable distributed coordination.
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Apache ZooKeeper vs Consul by HashiCorp opinions
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Consul is often used primarily as a service discovery mechanism, especially with a DNS interface. Apache ZooKeeper is primarily used as a real-time key/value store, with leader election and peer discovery (not service discovery) as contributing/supporting features. Also, ZooKeeper doesn't have a DNS interface.
Cycle is a developer-friendly container orchestration platform. By simplifying the processes around container and infrastructure deployments, Cycle enables developers to spend more time building and less time managing.