help request: Cannot find upstream nodes in Kubernetes discovery

[liuzhiyong1982]

Description

I deployed the APISIX from official Helm apisix chart v2.2.0. Below image is the overlay values for enabling Kubernetes service discovery.

what I have done:

• created SA, enabled RBAC;
• provided two env (KUBERNETES_SERVICE_HOST and KUBERNETES_SERVICE_PORT) for Nginx; I have tried FQDN kubernetes.default.svc.cluster.local and service IP in the KUBERNETES_SERVICE_HOST env, but no luck;
• used correct Service Name format in Apisix Dashboard;

however, I still got 503 when I attempt to open the site and was told 'failed to set upstream: no valid upstream node: nil'

Did I missed something?

Environment

• APISIX version (run apisix version): apache/apisix:3.5.0-debian
• Operating system (run uname -a): Azure Kubernetes Service
• OpenResty / Nginx version (run openresty -V or nginx -V): nginx version: openresty/1.21.4.2

[shreemaan-abhishek]

Did you configure the service_name in the following format?

function: nodes(service_name)

description: nodes() function attempts to look up the ngx.shared.DICT for nodes corresponding to servicename, \ servicename should match pattern: [namespace]/[name]:[portName]

ref: https://apisix.apache.org/docs/apisix/discovery/kubernetes/#single-cluster-mode-query-interface

[liuzhiyong1982]

@shreemaan-abhishek , yes, I am using the right serivce_name format in apisix upstream setting.

[monkeyDluffy6017]

@liuzhiyong1982 have you solved your problem?

[ray1888]

want help also, meeting the same issue

[rdouman]

I just got stuck with this same issue. I managed to resolve this by using the port name defined for this service (http in my instance) as oppose to the port number ( 80 in your example above). I hope this helps :)

Snippet from the service definition: spec: ports:

• name: http protocol: TCP port: 8081 targetPort: 8081

From the manual:

[mozhata]

met the same issue, the service not be set port name, then trying to use the port number, I get the same error log:

2024/05/16 09:14:23 [error] 386#386: *7955311 [lua] init.lua:548: handle_upstream(): failed to set upstream: no valid upstream node: nil, client: 10.77.101.0, server: _, request: "POST /xxx

additional: I set another route for a service which has port name, that succeed

[mozhata]

met the same issue, the service not be set port name, then trying to use the port number, I get the same error log:

2024/05/16 09:14:23 [error] 386#386: *7955311 [lua] init.lua:548: handle_upstream(): failed to set upstream: no valid upstream node: nil, client: 10.77.101.0, server: _, request: "POST /xxx

additional: I set another route for a service which has port name, that succeed

use target port number instead port number, fixed

[Thilip707]

pls give example format for this target port number instead port number

[luistilingue]

apiVersion: apisix.apache.org/v2
kind: ApisixUpstream
metadata:
  name: httpbin-upstream
  namespace: default
spec:
  loadbalancer:
    type: ewma
  discovery:
    type: kubernetes
    serviceName: default/httpbin:http

that way works for me.