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cclloyd
Asked: 2020-08-28 17:59:46 +0800 CST

400 Error with nginx-ingress to Kubernetes Dashboard

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I have an ingress that connects to Kubernetes Dashboard, but I'm getting a 400 error when trying to access it.

---
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
  annotations:
    kubernetes.io/ingress.class: nginx
    cert-manager.io/cluster-issuer: "letsencrypt-prod"
    nginx.ingress.kubernetes.io/backend-protocol: "HTTPS"
    nginx.ingress.kubernetes.io/auth-tls-verify-client: "false"
    nginx.ingress.kubernetes.io/whitelist-source-range: "10.0.0.0/16"
spec:
  tls:
    - hosts:
        - kube.example.com
      secretName: dashboard-tls  # confirmed is valid LE cert
  rules:
    - host: kube.example.com
      http:
        paths:
          - backend:
              serviceName: kubernetes-dashboard
              servicePort: 443

That gives me a 400 error in the nginx pod.

2020/08/28 01:25:58 [error] 2609#2609: *795 readv() failed (104: Connection reset by peer) while reading upstream, client: 10.0.0.25, server: kube.example.com, request: "GET / HTTP/1.1", upstream: "http://10.42.0.2:8443/", host: "kube.example.com"

10.0.0.25 - - [28/Aug/2020:01:25:58 +0000] "GET / HTTP/1.1" 400 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:79.0) Gecko/20100101 Firefox/79.0" "-"

 

And in case it is relevant, my nginx configuration, deployed through the helm chart nginx-stable/nginx-ingress

  ## nginx configuration
  ## Ref: https://github.com/kubernetes/ingress/blob/master/controllers/nginx/configuration.md
  ##
  controller:
    config:
      entries:
        hsts-include-subdomains: "false"
        ssl-ciphers: "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4"
        ssl-protocols: "TLSv1.1 TLSv1.2"
    ingressClass: nginx
    service:
      externalTrafficPolicy: Local
      annotations:
        metallb.universe.tf/address-pool: default
  defaultBackend:
    enabled: true
  tcp:
    22: "gitlab/gitlab-gitlab-shell:22"
nginx kubernetes nginx-ingress

1 Answers

  1. All you need is this annotation on your service ingress

    annotations:
    nginx.ingress.kubernetes.io/backend-protocol: HTTPS
    nginx.ingress.kubernetes.io/configuration-snippet: |-
      proxy_ssl_server_name on;
      proxy_ssl_name $host;
    • 13