Spring Cloud, Eureka FAQ summary.

Specify Eureka’s Environment

Specify the DataCenter for Eureka

How to solve the Eureka registration service slow problem

Using configuration items:

The original

Translation:

Being an instance also involves periodic heartbeats to the registry, with a default duration of 30 seconds (via serviceUrl). The service is not available for client discovery until the instance, server, and client all have the same metadata in the local cache (so 3 heartbeats may be required). You can use the eureka. Instance. LeaseRenewalIntervalInSeconds configuration, which will accelerate the process of clients to connect to other services. In production, it is best to stick with the defaults because there are calculations inside the server that make assumptions about renewal.

Eureka’s mode of self-protection

If the following message is displayed on the Eureka Server home page, it indicates that Eureka has entered the protected mode.

  • EMERGENCY! EUREKA MAY BE INCORRECTLY CLAIMING INSTANCES ARE UP WHEN THEY’RE NOT. RENEWALS ARE LESSER THAN THRESHOLD AND HENCE THE INSTANCES ARE NOT BEING EXPIRED JUST TO BE SAFE.

The protection mode is used when network partitions exist between a group of clients and the Eureka Server. Once in protected mode, Eureka Server will attempt to protect the information in its service registry and will not delete the data in the service registry (that is, will not unregister any microservices).

How to solve the Eureka Server does not kick out the stopped node

During the development process, we often expect Eureka Server to be able to kick out the stopped node quickly and efficiently. However, novice users often encounter problems that Eureka Server does not kick out the stopped node due to Eureka self-protection mode and long heartbeat cycles. Solutions are as follows:

(1) Eureka Server: Disable self-protection and set the interval for the Eureka Server to clear invalid nodes as required.

(2) Eureka Client: Enable the health check and configure the renewal time and expiration time as required.

Example:

Server configuration:

Client configuration:

Note:

Changing the Eureka update frequency will break the server’s self-protection function. It is not recommended to customize these configurations in production environments.

Example Customize Eureka Instance ID

In Spring Cloud, the default Instance ID of the service

is{spring.application.name} : ${spring.application.in, that is, the host name: Application name: application port. Therefore, the service information on the Eureka Server home page is similar to the following: itmuch:microservice-provider-user:8000. What if you want to customize this part of the information?

Example:

Eureka configuration best practice reference

Note: eureka. Client. Healthcheck. Enabled = true configuration items must be set in the application. The yml

Eureka. Client. Healthcheck. Enabled = true should only in the application. The yml in Settings. Setting bootstrap.yml can cause undesirable side effects, such as registering an application name of UNKNOWN in Eureka.

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