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Consul vs Eureka vs Zookeeper: What are the differences?

Consul is a service discovery framework with a REST interface and some features such as health checking, service segmentation with its own internal distributed key-value store. Consul includes service discovery, but also rich health checking, locking, Key/value, multi-datacenter federation, an event system. Eureka – A service discovery tool, the architecture is primarily client/server, with clients mainly using embedded SDK to register and discover services. A service locator used as part of Netflix's load balancers and failovers. Zookeeper –Apache Zookeeper is a distributed key-value store which can be used as the basis to implement service discovery. Mostly a common-purpose distributed key/value store used for service-discovery in conjunction.

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What is Consul?

Consul is a tool for service discovery and configuration. Consul is distributed, highly available, and extremely scalable.

What is Eureka?

Eureka is a REST (Representational State Transfer) based service that is primarily used in the AWS cloud for locating services for the purpose of load balancing and failover of middle-tier servers.

What is Zookeeper?

A centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. All of these kinds of services are used in some form or another by distributed applications.
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        What companies use Consul?
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        What are some alternatives to Consul, Eureka, and Zookeeper?
        etcd is a distributed key value store that provides a reliable way to store data across a cluster of machines. It’s open-source and available on GitHub. etcd gracefully handles master elections during network partitions and will tolerate machine failure, including the master.
        SkyDNS is a distributed service for announcement and discovery of services. It leverages Raft for high-availability and consensus, and utilizes DNS queries to discover available services. This is done by leveraging SRV records in DNS, with special meaning given to subdomains, priorities and weights (more info here:
        Map services to arbitrary URLs in a single, declarative YAML file. Configure routes with CORS support, circuit breakers, timeouts, and more. Replace your Kubernetes ingress controller. Route gRPC, WebSockets, or HTTP.
        Redis is an open source, BSD licensed, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets.
        Kubernetes is an open source orchestration system for Docker containers. It handles scheduling onto nodes in a compute cluster and actively manages workloads to ensure that their state matches the users declared intentions.
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        Decisions about Consul, Eureka, and Zookeeper
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        How developers use Consul, Eureka, and Zookeeper
        Avatar of Soundcloud
        Soundcloud uses ZookeeperZookeeper

        Initially, Stitch only supported real-time updates and addressed this problem with a MapReduce job named The Restorator that performed the following actions:

        • Calculated the expected totals
        • Queried Cassandra to get the values it had for each counter
        • Calculated the increments needed to apply to fix the counters
        • Applied the increments

        Meanwhile, to stop the sand shifting under its feet, The Restorator needed to coordinate a locking system between itself and the real-time processors, so that the processors did not try to simultaneously apply increments to the same counter, resulting in a race-condition. It used ZooKeeper for this.

        Avatar of Pinterest
        Pinterest uses ZookeeperZookeeper

        Like many large scale web sites, Pinterest’s infrastructure consists of servers that communicate with backend services composed of a number of individual servers for managing load and fault tolerance. Ideally, we’d like the configuration to reflect only the active hosts, so clients don’t need to deal with bad hosts as often. ZooKeeper provides a well known pattern to solve this problem.

        Avatar of Chris Hartwig
        Chris Hartwig uses ConsulConsul

        All our services use Consul for discovery, configuration and cluster management (auto scaling, health monitoring, dynamic reconfiguration, leader elections)

        Avatar of Pinterest
        Pinterest uses ZookeeperZookeeper

        Zookeeper manages our state, and tells each node what version of code it should be running.

        Avatar of Ralic Lo
        Ralic Lo uses ZookeeperZookeeper

        Used Zookeeper as the resource management system for Mesos/Marathon services.

        Avatar of Tom Staijen
        Tom Staijen uses ConsulConsul

        Discovery service. Some configuration is stored in consul.

        Avatar of Robert Hao
        Robert Hao uses ConsulConsul

        I used Consul as config center & service discoverer.

        Avatar of Nurul Ferdous
        Nurul Ferdous uses ZookeeperZookeeper

        Maintain a distributed cluster for search index

        Avatar of Ismael Arenzana
        Ismael Arenzana uses ConsulConsul

        How else do you discover microservices? ;)

        Avatar of exana
        exana uses ConsulConsul

        For service discovery.

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        How much does Zookeeper cost?
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