Lets consider the following situation.This example will only have urls containing localhost. I have a zuul proxy setup and lets say its running on port 8080. So
Zuul proxy-
localhost:8080
I have an eureka server setup running on port 81.
Eureka server-
localhost:8081.
I have an application lets call it by name-example which is a REST web service. Its running on 3 different ports 82,83 and 84. All 3 instances are registered with eureka server. I have a filter setup in zuul for the uri /example.
So i expect consumers to call the zuul proxy at locahost:8080/example.
Now, in the application example for the request mapping /example, there is a controller setup.
So what i want to do is basically have the consumers call localhost:8080/example and route that request to localhost:8082/example, localhost:8083/example, localhost:8084/example . I know how to load balance using ribbon and eureka and have all the appropriate properties set to achieve that.
zuul.routes.example.serviceid=example
ribbon.eureka.enabled=true.
What i want to do is have ribbon look up the list of url(s) from eureka server and then call localhost:8082/example rather localhost:8082.
Is this possible?
Thank you in advance.
You need to specify the path & serviceId
zuul:
routes:
examplepath:
path: /example/**
serviceId: name-example
stripPrefix: false
The serviceId is the name registered with Eureka. Hope you are specifying Eureka server details in you Zuul gateway.
Related
Im working with Spring Cloud Zuul + Eureka Server. i know that Zuul will create routes dynamically when there is a service registered on Eureka and it will be route using their Service ID. Is it possible to delegate routes to group services ?
for example i have 2 services that i want to group:
server.port=8081
spring.application.name=company-account-api
server.port=8082
spring.application.name=company-transaction-api
eureka config
spring.application.name=api-discovery
spring.cloud.config.uri=${CONFIG_SERVER_URL:http://localhost:8888}
on Zuul is it possible define a route where i can access the 2 services registered on eureka ?
server.port=9090
spring.application.name=api-gateway
eureka.instance.preferIpAddress=true
eureka.client.registerWithEureka=true
eureka.client.fetchRegistry=true
eureka.serviceurl.defaultzone=http://localhost:8761/eureka
zuul.routes.company-api=/company-**
so when i access http://localhost:9090/company-api/company-account-api & http://localhost:9090/company-api/company-transaction-api the service registered on eureka will be available
You can achieve this with the following config
zuul.ignored-services=*
zuul.routes.company-account-api.serviceId=company-account-api
zuul.routes.company-account-api.path=/company-api/company-account-api/**
zuul.routes.company-transaction-api.serviceId=company-transaction-api
zuul.routes.company-transaction-api.path=/company-api/company-transaction-api/**
Explanation:
zuul.ignored-services=* This will supress the default config
zuul.routes.company-account-api.serviceId=company-account-api
zuul.routes.company-account-api.path=/company-api/company-account-api/**
What is exposed to public is /company-api/company-account-api/** which will be internally mapped to company-account-api service.
If you are not using service discovery then you can do it using url instead of service name
zuul.routes.company-account-api.url=http://accountapihost:accountapiport
zuul.routes.company-account-api.path=/company-api/company-account-api/**
In a spring-cloud-netflix setup (everything uses feign,ribbon,eureka,zuul), is there any simple/elegant/out-of-the-box way (i.e. discovery based on serviceId vs URL) for CompositeAB to communicate to ServiceA and ServiceB through Zuul? In all of the examples I've seen, CompositeAB discovers and calls ServiceA directly vs. via the Zuul route for ServiceA.
Put another way, if ServiceA registers itself in Eureka as service-a, is the automatically created Zuul proxy for service-a exposed in Eureka in any discoverable way?
For real world context, this relates to network topology and firewalls (there's no direct route between CompositeAB and ServiceA - everything needs to go through the gateway). Using URLs in CompositeAB isn't awful, but seems to defeat the purpose of having the registry present (ideally, Zuul would register the proxy for service-a as something like "zuul-service-a" in the registry). That said, i do get how this particular use case doesn't really fit Zuul's purpose as an edge gateway.
Finally, i think i know how to get my desired effect through code - just wanted to check that i wasn't reinventing any wheels first.
Make sure that your Zuul proxy is registering with Eureka and fetching the registry. Any service that registers with eureka will get a route.
You don't have to allow every service that registers with eureka to be accessible via the proxy either.
A sample application.yml for your Zuul proxy that only allows service-a and service-b:
eureka:
client:
fetchRegistry: true
zuul:
add-proxy-headers: true
ignored-services: "*"
routes:
service-a:
serviceId: service-a
service-b:
serviceId: service-b
I have a python web app, and registered with eureka using restfull api[https://github.com/Netflix/eureka/wiki/Eureka-REST-operations], and I found it status UP on the eureka web page, but my gateway server(also registered with eureka) can not find it, I call the url "gateway-server-host/myapp-url" and the following response is:
com.netflix.zuul.exception.ZuulException: Forwarding error at
org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.handleException(RibbonRoutingFilter.java:188)
at
org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:163)
at
org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.run(RibbonRoutingFilter.java:111)
...
Caused by: com.netflix.client.ClientException: Load balancer does not
have available server for client: test at
com.netflix.loadbalancer.LoadBalancerContext.getServerFromLoadBalancer(LoadBalancerContext.java:483)
at
com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:184)
at
com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:180)
any advise for this problem???
Have you looked over Spring Cloud's Sidecar ?
It basically a service over your non-jvm language service (in your case python) and with sidecar service (you have to deploy your python service and the sidecar service on the same host, if I am not mistaken) and you will include in your Zuul the endpoint to the sidecar service, which will try to handle things like eureka and such.
You spin up a new spring-boot app, with #EnableSidecar annotated, you configure the health-uri and port
example application.yml
server:
port: 5678
spring:
application:
name: sidecar
sidecar:
port: 8000
health-uri: http://localhost:8000/health.json
You can checkout Spring Cloud's documentation regarding Sidecar here for more details how to set it up
Since you are using Zuul you need to manually register routes. Its okay for them to just include the application name, from Eureka.
Example of Zuul route config:
zuul:
routes:
application1: /app1/**
application2: /app2/**
application3:
path: /app3/**
url: http://10.0.8.11:3000/
applicationN is the name registred in Eureka. The url will be resolved and load balanced automatically. For app3 the url is manually specified.
Adding Sidecar solves this problem to an extent where your Zuul /routes shows the registered Application Name.
You must have experienced , even if you do not have an actual app and just put any name with a payload following this document - [https://github.com/Netflix/eureka/wiki/Eureka-REST-operations] , that too gets registered in Eureka as an app.
I have Zuul and Eureka running, with a bunch of smaller services. Using Eureka, I can see all of the services and their associated host/IP address. Usually, I can boot up multiple instances of another service and Eureka will pick them up for Zuul to route to. I'm currently having an issue where I have three instances of a service registered in Eureka, but Zuul only routes to one of them. I don't know where to go to get diagnostic information from Zuul to understand why it isn't routing to the other two instances. I've tried simple things, like manually sending requests from the Zuul box to the service boxes to make sure they can communicate.
Does Zuul expose an endpoint to list hosts/IP addresses and their status? What are my diagnostic options?
You can try to list all your endpoints with the routes endpoint
So, if you running zuul on your localhost on port 8080 you can do a GET call to http://localhost:8080/routes and you will get something like
{
/stores/**: "http://localhost:8081"
}
Depending on the version you are using, you also need to set
management.security.enabled = false
in the application.properties
EDIT:
You can also use the logging mechanism.
Set the loglevel just of the LoadBalancerContext to debug in application.properties
#logging
logging.level.com.netflix.loadbalancer.LoadBalancerContext=DEBUG
It will log each call that is routed.
I hava eureka server at eureka-server.com host and application with appId facade registered at server. Facade application has /users endpoint. Can I call /users endpoint through Eureka server something like this eureka-server.com/facade/users ?
No, Eureka can't proxy your calls through it, it's pure service discovery. But you can add a separate Zuul service with reverse proxy filtering which uses Eureka client to discover routes. Spring Cloud Netflix Zuul component has this out of the box.