In a microservices architecture, the service registry plays a crucial role in enabling communication between services. The registry we previously set up is only suitable for local development. However, in a production environment, it's essential to deploy a cluster to ensure high availability and fault tolerance.
Setting up an Eureka cluster is straightforward. Each Eureka instance needs to be configured to point to at least one other Eureka node. For simplicity, we'll demonstrate this with two nodes: a master and a slaveone.
To achieve this, both nodes must register with each other. That means:
- The master registers with the slaveone.
- The slaveone registers with the master.
If you have three nodes, the same logic applies. Each node should register with the others, creating a fully connected network of Eureka servers.
To run different instances on separate machines, we need to create multiple configuration files. For example:
**application-master.properties**
```
server.port=8761
eureka.client.serviceUrl.defaultZone=http://username:password@slaveone:8762/eureka/
spring.application.name=fangjia-eureka
eureka.instance.hostname=localhost
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
eureka.server.enableSelfPreservation=false
security.basic.enabled=true
security.user.name=username
security.user.password=Password
spring.profiles.active=master
```
**application-slaveone.properties**
```
server.port=8762
eureka.client.serviceUrl.defaultZone=http://username:password@master:8761/eureka/
spring.application.name=fangjia-eureka
eureka.instance.hostname=localhost
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
eureka.server.enableSelfPreservation=false
security.basic.enabled=true
security.user.name=username
security.user.password=Password
spring.profiles.active=slaveone
```
Make sure that the hostnames "master" and "slaveone" are correctly mapped in your hosts file or use IP addresses directly if needed.
By starting the master instance on one machine and the slaveone on another, both will register with each other. This ensures that the registry information is synchronized across all nodes.
Even if one node fails, the application can still rely on the remaining active registry to discover and communicate with services. This setup enhances reliability and ensures continuous operation in a production environment.
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