Eureka Server: How to achieve high availability

Eureka Discovery Server should be used in the Peer-Aware config mode in production setups. Check: http://cloud.spring.io/spring-cloud-static/spring-cloud.html#_peer_awareness For instance your first eureka server instance will have config like this: server: port: 1111 eureka: instance: hostname: peer1 client: serviceUrl: defaultZone: http://peer2:1112/eureka/ ..and second server instance like this: server: port: 1112 eureka: instance: hostname: peer2 client: serviceUrl: defaultZone: … Read more

Eureka and Kubernetes

How can I setup something like eureka.client.serviceUri? You have to have a Kubernetes service on top of the eureka pods/deployments which then will provide you a referable IP address and port number. And then use that referable address to look up the Eureka service, instead of “8761”. To address further question about HA configuration of … Read more

How to check two condition while using @ConditionalOnProperty or @ConditionalOnExpression

Since from the beginning of @ConditionalOnProperty it was possible to check more than one property. The name / value attribute is an array. @Configuration @ConditionalOnProperty({ “property1”, “property2” }) protected static class MultiplePropertiesRequiredConfiguration { @Bean public String foo() { return “foo”; } } For simple boolean properties with an AND check you don’t need a @ConditionalOnExpression.

What is the role of Zookeeper vs Eureka for microservices?

I am going to implement the orchestration of a set of microservices in my application. This is a hard problem to solve by yourself. You are probably better off using an existing orchestration system (see below). Is there any other powerful tool? You should look into kubernetes, which seems to be the standard in orchestration … Read more

What is Eureka service, Eureka Client, Eureka instance and Eureka server

Definitions Eureka Server The discovery server. It contains a registry of services and a REST api that can be used to register a service, deregister a service, and discover the location of other services. Eureka Service Any application that can be found in the Eureka Server’s registry and is discoverable by others. A service has … Read more

Understanding Spring Cloud Eureka Server self preservation and renew threshold

I got the same question as @codependent met, I googled a lot and did some experiment, here I come to contribute some knowledge about how Eureka server and instance work. Every instance needs to renew its lease to Eureka Server with frequency of one time per 30 seconds, which can be define in eureka.instance.leaseRenewalIntervalInSeconds. Renews … Read more

What’s the difference between EnableEurekaClient and EnableDiscoveryClient?

There are multiple implementations of “Discovery Service” (eureka, consul, zookeeper). @EnableDiscoveryClient lives in spring-cloud-commons and picks the implementation on the classpath. @EnableEurekaClient lives in spring-cloud-netflix and only works for eureka. If eureka is on your classpath, they are effectively the same.

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