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Serf vs zetcd: What are the differences?
Serf: Service orchestration and management tool. Serf is a service discovery and orchestration tool that is decentralized, highly available, and fault tolerant. Serf runs on every major platform: Linux, Mac OS X, and Windows. It is extremely lightweight: it uses 5 to 10 MB of resident memory and primarily communicates using infrequent UDP messages; zetcd: Serve the Apache Zookeeper API but back it with an etcd cluster. A ZooKeeper "personality" for etcd. Point a ZooKeeper client at zetcd to dispatch the operations on an etcd cluster. Protocol encoding and decoding heavily based on go-zookeeper.
Serf and zetcd belong to "Open Source Service Discovery" category of the tech stack.
Serf and zetcd are both open source tools. It seems that Serf with 4.7K GitHub stars and 467 forks on GitHub has more adoption than zetcd with 886 GitHub stars and 58 GitHub forks.