In a microservices architecture, the service registry plays a crucial role. The registry we set up earlier is only suitable for local development. However, in a production environment, it's essential to deploy a cluster to ensure high availability and reliability.
Setting up an Eureka cluster is straightforward. Each Eureka instance needs to be configured to point to at least one other node in the cluster. For simplicity, let's walk through a two-node setup.
We have two machines: one acting as the master and the other as slaveone. To configure them:
- The master should register with slaveone.
- Slaveone should also register with the master.
If there are three nodes, the same pattern applies. For example:
- Master registers with slaveone and slavetwo.
- Slaveone registers with the master and slavetwo.
- Slavetwo registers with the master and slaveone.
To run different instances, we need to create separate configuration files. Let's start by adding `application-master.properties` and `application-slaveone.properties`.
In `application-master.properties`, we set:
```
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
```
In `application-slaveone.properties`, we set:
```
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 the hostnames (like `master` and `slaveone`) are correctly defined in your hosts file or directly mapped to IP addresses.
Once these configurations are in place, you can start each instance using the appropriate profile. The master will register with the slave, and the slave will register with the master, creating a fully functional cluster.
This setup ensures that even if one node fails, the others continue to operate, providing continuous service discovery and maintaining system stability.
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