Ingress-nginx: nginx-ingress: occasional 503 Service Temporarily Unavailable

Created on 7 Jun 2017 · 12Comments · Source: kubernetes/ingress-nginx

I'm experiencing often 503 response from nginx-ingress-controller which returns as well
Kubernetes Ingress Controller Fake Certificate (2) instead of provided wildcard certificate.
Image is gcr.io/google_containers/nginx-ingress-controller:0.9.0-beta.7

Looks like at some point nginx cannot resolve proper server_name and returns fake. But then why it ignores --default-ssl-certificate argument.
Anyway I'm out of thoughts thus any help appreciated

Cluster is running at GKE

Good request

$ curl -I -v -L https://environment.trysimply.com/cluster/dashboard -k
*   Trying 104.197.245.109...
* TCP_NODELAY set
* Connected to environment.trysimply.com (104.197.245.109) port 443 (#0)
* TLS 1.2 connection using TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
* Server certificate: *.trysimply.com
* Server certificate: Go Daddy Secure Certificate Authority - G2
* Server certificate: Go Daddy Root Certificate Authority - G2
> HEAD /cluster/dashboard HTTP/1.1
> Host: environment.trysimply.com
> User-Agent: curl/7.51.0
> Accept: */*
>
< HTTP/1.1 302 Moved Temporarily
HTTP/1.1 302 Moved Temporarily
< Server: nginx/1.13.0
Server: nginx/1.13.0
< Date: Wed, 07 Jun 2017 11:12:29 GMT
Date: Wed, 07 Jun 2017 11:12:29 GMT
< Content-Type: text/html
Content-Type: text/html
< Content-Length: 161
Content-Length: 161
< Connection: keep-alive
Connection: keep-alive
< Location: https://environment.trysimply.com/oauth2/sign_in
Location: https://environment.trysimply.com/oauth2/sign_in
< Strict-Transport-Security: max-age=15724800; includeSubDomains;
Strict-Transport-Security: max-age=15724800; includeSubDomains;

<
* Curl_http_done: called premature == 0
* Connection #0 to host environment.trysimply.com left intact
* Issue another request to this URL: 'https://environment.trysimply.com/oauth2/sign_in'
* Found bundle for host environment.trysimply.com: 0x7ffc31c0c130 [can pipeline]
* Re-using existing connection! (#0) with host environment.trysimply.com
* Connected to environment.trysimply.com (104.197.245.109) port 443 (#0)
> HEAD /oauth2/sign_in HTTP/1.1
> Host: environment.trysimply.com
> User-Agent: curl/7.51.0
> Accept: */*
>
< HTTP/1.1 200 OK
HTTP/1.1 200 OK
< Server: nginx/1.13.0
Server: nginx/1.13.0
< Date: Wed, 07 Jun 2017 11:12:29 GMT
Date: Wed, 07 Jun 2017 11:12:29 GMT
< Content-Type: text/html; charset=utf-8
Content-Type: text/html; charset=utf-8
< Connection: keep-alive
Connection: keep-alive
< Set-Cookie: environment_oauth2_proxy=; Path=/; Domain=environment.trysimply.com; Expires=Wed, 07 Jun 2017 10:12:29 GMT; HttpOnly; Secure
Set-Cookie: environment_oauth2_proxy=; Path=/; Domain=environment.trysimply.com; Expires=Wed, 07 Jun 2017 10:12:29 GMT; HttpOnly; Secure
< Strict-Transport-Security: max-age=15724800; includeSubDomains;
Strict-Transport-Security: max-age=15724800; includeSubDomains;

<
* Curl_http_done: called premature == 0
* Connection #0 to host environment.trysimply.com left intact

Bad request

$ curl -I -v -L https://environment.trysimply.com/cluster/dashboard -k
*   Trying 104.197.245.109...
* TCP_NODELAY set
* Connected to environment.trysimply.com (104.197.245.109) port 443 (#0)
* TLS 1.2 connection using TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
* Server certificate: Kubernetes Ingress Controller Fake Certificate
> HEAD /cluster/dashboard HTTP/1.1
> Host: environment.trysimply.com
> User-Agent: curl/7.51.0
> Accept: */*
>
< HTTP/1.1 503 Service Temporarily Unavailable
HTTP/1.1 503 Service Temporarily Unavailable
< Server: nginx/1.13.0
Server: nginx/1.13.0
< Date: Wed, 07 Jun 2017 11:12:33 GMT
Date: Wed, 07 Jun 2017 11:12:33 GMT
< Content-Type: text/html
Content-Type: text/html
< Content-Length: 213
Content-Length: 213
< Connection: keep-alive
Connection: keep-alive
< Strict-Transport-Security: max-age=15724800; includeSubDomains;
Strict-Transport-Security: max-age=15724800; includeSubDomains;

<
* Curl_http_done: called premature == 0
* Connection #0 to host environment.trysimply.com left intact

Configs used

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-ingress
  namespace: kube-system
data:
  force-ssl-redirect: "true"
  ssl-redirect: "true"
  use-proxy-protocol: "false"

---

apiVersion: v1
kind: Service
metadata:
  name: nginx-ingress
  namespace: kube-system
  labels:
    app: nginx-ingress
spec:
  type: LoadBalancer
  ports:
  - port: 80
    name: http
  - port: 443
    name: https
  - port: 18443
    name: vpn
  selector:
    k8s-app: nginx-ingress

---

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: redirected-environment.trysimply.com
  namespace: kube-system
  annotations:
    ingress.kubernetes.io/auth-signin: "https://environment.trysimply.com/oauth2/sign_in"
    ingress.kubernetes.io/auth-url: "https://environment.trysimply.com/oauth2/auth"
    kubernetes.io/ingress.class: "nginx"
    ingress.kubernetes.io/rewrite-target: /
spec:
  tls:
  - hosts:
    - environment.trysimply.com
    secretName: star-trysimply-com
  rules:
  - host: environment.trysimply.com
    http:
      paths:
      - path: /cluster/dashboard
        backend:
          serviceName: kubernetes-dashboard
          servicePort: 80

---

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: oauth2-proxy
  namespace: kube-system
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  tls:
  - hosts:
    - environment.trysimply.com
    secretName: star-trysimply-com
  rules:
  - host: environment.trysimply.com
    http:
      paths:
      - path: /oauth2
        backend:
          serviceName: oauth2-proxy
          servicePort: 4180

---

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-ingress
  namespace: kube-system
spec:
  replicas: 1
  strategy:
    type: Recreate
  revisionHistoryLimit: 1
  template:
    metadata:
      labels:
        k8s-app: nginx-ingress
    spec:
      terminationGracePeriodSeconds: 60
      containers:
      - image: gcr.io/google_containers/nginx-ingress-controller:0.9.0-beta.7
        name: nginx-ingress
        imagePullPolicy: Always
        readinessProbe:
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
        livenessProbe:
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
          initialDelaySeconds: 10
          timeoutSeconds: 1
        env:
          - name: POD_NAME
            valueFrom:
              fieldRef:
                fieldPath: metadata.name
          - name: POD_NAMESPACE
            valueFrom:
              fieldRef:
                fieldPath: metadata.namespace
        ports:
        - containerPort: 80
          hostPort: 80
        - containerPort: 443
          hostPort: 443
        - containerPort: 18443
          hostPort: 18443
        args:
        - /nginx-ingress-controller
        - --default-backend-service=kube-system/default-http-backend
        - --tcp-services-configmap=kube-system/tcp
        - --configmap=kube-system/nginx-ingress
#        - --watch-namespace=kube-system
#        - --ingress-class=nginx
#        - --force-namespace-isolation=true
#        - --healthz-port=10254
#        - --logtostderr
        - --default-ssl-certificate=kube-system/star-trysimply-com
        - --v=2

Pod nginx.conf

$ kubectl exec -it -n kube-system nginx-ingress-455914881-16zs1 -- cat /etc/nginx/nginx.conf

daemon off;

worker_processes 1;
pid /run/nginx.pid;

worker_rlimit_nofile 1047552;
events {
    multi_accept        on;
    worker_connections  16384;
    use                 epoll;
}

http {
    set_real_ip_from    0.0.0.0/0;
    real_ip_header      X-Forwarded-For;

    real_ip_recursive   on;

    geoip_country       /etc/nginx/GeoIP.dat;
    geoip_city          /etc/nginx/GeoLiteCity.dat;
    geoip_proxy_recursive on;
    # lua section to return proper error codes when custom pages are used
    lua_package_path '.?.lua;/etc/nginx/lua/?.lua;/etc/nginx/lua/vendor/lua-resty-http/lib/?.lua;';
    init_by_lua_block {
        require("error_page")
    }

    sendfile            on;
    aio                 threads;
    tcp_nopush          on;
    tcp_nodelay         on;

    log_subrequest      on;

    reset_timedout_connection on;

    keepalive_timeout  75s;
    keepalive_requests 100;

    client_header_buffer_size       1k;
    large_client_header_buffers     4 8k;
    client_body_buffer_size         8k;

    http2_max_field_size            4k;
    http2_max_header_size           16k;

    types_hash_max_size             2048;
    server_names_hash_max_size      1024;
    server_names_hash_bucket_size   64;
    map_hash_bucket_size            64;

    underscores_in_headers          off;
    ignore_invalid_headers          on;

    include /etc/nginx/mime.types;
    default_type text/html;
    gzip on;
    gzip_comp_level 5;
    gzip_http_version 1.1;
    gzip_min_length 256;
    gzip_types application/atom+xml application/javascript application/x-javascript application/json application/rss+xml application/vnd.ms-fontobject application/x-font-ttf application/x-web-app-manifest+json application/xhtml+xml application/xml font/opentype image/svg+xml image/x-icon text/css text/plain text/x-component;
    gzip_proxied any;

    server_tokens on;

    # disable warnings
    uninitialized_variable_warn off;

    log_format upstreaminfo '$the_x_forwarded_for - [$the_x_forwarded_for] - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent" $request_length $request_time [$proxy_upstream_name] $upstream_addr $upstream_response_length $upstream_response_time $upstream_status';

    map $request_uri $loggable {
        default 1;
    }

    access_log /var/log/nginx/access.log upstreaminfo if=$loggable;
    error_log  /var/log/nginx/error.log notice;

    resolver 10.59.240.10 valid=30s;

    # Retain the default nginx handling of requests without a "Connection" header
    map $http_upgrade $connection_upgrade {
        default          upgrade;
        ''               close;
    }

    # trust http_x_forwarded_proto headers correctly indicate ssl offloading
    map $http_x_forwarded_proto $pass_access_scheme {
        default          $http_x_forwarded_proto;
        ''               $scheme;
    }

    map $http_x_forwarded_port $pass_server_port {
       default           $http_x_forwarded_port;
       ''                $server_port;
    }

    map $pass_access_scheme $the_x_forwarded_for {
       default           $remote_addr;
       https             $proxy_protocol_addr;
    }

    map $pass_access_scheme $the_real_ip {
       default           $remote_addr;
       https             $proxy_protocol_addr;
    }

    # map port 442 to 443 for header X-Forwarded-Port
    map $pass_server_port $pass_port {
        442              443;
        default          $pass_server_port;
    }

    # Map a response error watching the header Content-Type
    map $http_accept $httpAccept {
        default          html;
        application/json json;
        application/xml  xml;
        text/plain       text;
    }

    map $httpAccept $httpReturnType {
        default          text/html;
        json             application/json;
        xml              application/xml;
        text             text/plain;
    }

    # Obtain best http host
    map $http_host $best_http_host {
        default          $http_host;
        ''               $host;
    }

    server_name_in_redirect off;
    port_in_redirect        off;

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

    # turn on session caching to drastically improve performance
    ssl_session_cache builtin:1000 shared:SSL:10m;
    ssl_session_timeout 10m;

    # allow configuring ssl session tickets
    ssl_session_tickets on;

    # slightly reduce the time-to-first-byte
    ssl_buffer_size 4k;

    # allow configuring custom ssl ciphers
    ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA';
    ssl_prefer_server_ciphers on;

    ssl_ecdh_curve secp384r1;

    # In case of errors try the next upstream server before returning an error
    proxy_next_upstream                     error timeout invalid_header http_502 http_503 http_504;

    proxy_ssl_session_reuse on;

    upstream kube-system-kubernetes-dashboard-80 {
        # Load balance algorithm; empty for round robin, which is the default
        least_conn;
        server 10.56.3.4:9090 max_fails=0 fail_timeout=0;
    }
    upstream kube-system-oauth2-proxy-4180 {
        # Load balance algorithm; empty for round robin, which is the default
        least_conn;
        server 10.56.1.122:4180 max_fails=0 fail_timeout=0;
    }
    upstream upstream-default-backend {
        # Load balance algorithm; empty for round robin, which is the default
        least_conn;
        server 10.56.3.48:8080 max_fails=0 fail_timeout=0;
    }

    server {
        server_name _;
        listen 80 default_server reuseport backlog=511;
        listen [::]:80 default_server reuseport backlog=511;
        set $proxy_upstream_name "-";

        listen 442 proxy_protocol default_server reuseport backlog=511 ssl http2;
        listen [::]:442 proxy_protocol  default_server reuseport backlog=511 ssl http2;
        # PEM sha: 21cdeddc99bd37f37685a924de5fe00d1ea91465
        ssl_certificate                         /ingress-controller/ssl/kube-system-star-trysimply-com.pem;
        ssl_certificate_key                     /ingress-controller/ssl/kube-system-star-trysimply-com.pem;

        more_set_headers                        "Strict-Transport-Security: max-age=15724800; includeSubDomains;";
        location / {
            set $proxy_upstream_name "upstream-default-backend";
            port_in_redirect off;

            client_max_body_size                    "1m";

            proxy_set_header Host                   $best_http_host;

            # Pass the extracted client certificate to the backend

            # Pass Real IP
            proxy_set_header X-Real-IP              $the_real_ip;

            # Allow websocket connections
            proxy_set_header                        Upgrade           $http_upgrade;
            proxy_set_header                        Connection        $connection_upgrade;

            proxy_set_header X-Real-IP              $the_real_ip;
            proxy_set_header X-Forwarded-For        $the_x_forwarded_for;
            proxy_set_header X-Forwarded-Host       $best_http_host;
            proxy_set_header X-Forwarded-Port       $pass_port;
            proxy_set_header X-Forwarded-Proto      $pass_access_scheme;
            proxy_set_header X-Original-URI         $request_uri;
            proxy_set_header X-Scheme               $pass_access_scheme;

            # mitigate HTTPoxy Vulnerability
            # https://www.nginx.com/blog/mitigating-the-httpoxy-vulnerability-with-nginx/
            proxy_set_header Proxy                  "";

            # Custom headers

            proxy_connect_timeout                   5s;
            proxy_send_timeout                      60s;
            proxy_read_timeout                      60s;

            proxy_redirect                          off;
            proxy_buffering                         off;
            proxy_buffer_size                       "4k";
            proxy_buffers                           4 "4k";

            proxy_http_version                      1.1;

            proxy_cookie_domain                     off;
            proxy_cookie_path                       off;

            proxy_pass http://upstream-default-backend;
        }

        # health checks in cloud providers require the use of port 80
        location /healthz {
            access_log off;
            return 200;
        }

        # this is required to avoid error if nginx is being monitored
        # with an external software (like sysdig)
        location /nginx_status {
            allow 127.0.0.1;
            allow ::1;
            deny all;

            access_log off;
            stub_status on;
        }
    }

    server {
        server_name environment.trysimply.com;
        listen 80;
        listen [::]:80;
        set $proxy_upstream_name "-";

        listen 442 proxy_protocol ssl http2;
        listen [::]:442 proxy_protocol  ssl http2;
        # PEM sha: 21cdeddc99bd37f37685a924de5fe00d1ea91465
        ssl_certificate                         /ingress-controller/ssl/kube-system-star-trysimply-com.pem;
        ssl_certificate_key                     /ingress-controller/ssl/kube-system-star-trysimply-com.pem;

        more_set_headers                        "Strict-Transport-Security: max-age=15724800; includeSubDomains;";
        # enforce ssl on server side
        if ($pass_access_scheme = http) {
            return 301 https://$best_http_host$request_uri;
        }
        location /oauth2 {
            set $proxy_upstream_name "kube-system-oauth2-proxy-4180";
            port_in_redirect off;

            client_max_body_size                    "1m";

            proxy_set_header Host                   $best_http_host;

            # Pass the extracted client certificate to the backend

            # Pass Real IP
            proxy_set_header X-Real-IP              $the_real_ip;

            # Allow websocket connections
            proxy_set_header                        Upgrade           $http_upgrade;
            proxy_set_header                        Connection        $connection_upgrade;

            proxy_set_header X-Real-IP              $the_real_ip;
            proxy_set_header X-Forwarded-For        $the_x_forwarded_for;
            proxy_set_header X-Forwarded-Host       $best_http_host;
            proxy_set_header X-Forwarded-Port       $pass_port;
            proxy_set_header X-Forwarded-Proto      $pass_access_scheme;
            proxy_set_header X-Original-URI         $request_uri;
            proxy_set_header X-Scheme               $pass_access_scheme;

            # mitigate HTTPoxy Vulnerability
            # https://www.nginx.com/blog/mitigating-the-httpoxy-vulnerability-with-nginx/
            proxy_set_header Proxy                  "";

            # Custom headers

            proxy_connect_timeout                   5s;
            proxy_send_timeout                      60s;
            proxy_read_timeout                      60s;

            proxy_redirect                          off;
            proxy_buffering                         off;
            proxy_buffer_size                       "4k";
            proxy_buffers                           4 "4k";

            proxy_http_version                      1.1;

            proxy_cookie_domain                     off;
            proxy_cookie_path                       off;

            proxy_pass http://kube-system-oauth2-proxy-4180;
        }
        # enforce ssl on server side
        if ($pass_access_scheme = http) {
            return 301 https://$best_http_host$request_uri;
        }

        location = /_external-auth-L2NsdXN0ZXIvZGFzaGJvYXJk {
            internal;
            set $proxy_upstream_name "internal";

            proxy_pass_request_body     off;
            proxy_set_header            Content-Length "";
            proxy_pass_request_headers  on;
            proxy_set_header            Host environment.trysimply.com;
            proxy_ssl_server_name       on;

            set $target https://environment.trysimply.com/oauth2/auth;
            proxy_pass $target;
        }

        location ~* ^/cluster/dashboard\/?(?<baseuri>.*) {
            set $proxy_upstream_name "kube-system-kubernetes-dashboard-80";
            port_in_redirect off;

            # this location requires authentication
            auth_request /_external-auth-L2NsdXN0ZXIvZGFzaGJvYXJk;

            error_page 401 = https://environment.trysimply.com/oauth2/sign_in;

            client_max_body_size                    "1m";

            proxy_set_header Host                   $best_http_host;

            # Pass the extracted client certificate to the backend

            # Pass Real IP
            proxy_set_header X-Real-IP              $the_real_ip;

            # Allow websocket connections
            proxy_set_header                        Upgrade           $http_upgrade;
            proxy_set_header                        Connection        $connection_upgrade;

            proxy_set_header X-Real-IP              $the_real_ip;
            proxy_set_header X-Forwarded-For        $the_x_forwarded_for;
            proxy_set_header X-Forwarded-Host       $best_http_host;
            proxy_set_header X-Forwarded-Port       $pass_port;
            proxy_set_header X-Forwarded-Proto      $pass_access_scheme;
            proxy_set_header X-Original-URI         $request_uri;
            proxy_set_header X-Scheme               $pass_access_scheme;

            # mitigate HTTPoxy Vulnerability
            # https://www.nginx.com/blog/mitigating-the-httpoxy-vulnerability-with-nginx/
            proxy_set_header Proxy                  "";

            # Custom headers

            proxy_connect_timeout                   5s;
            proxy_send_timeout                      60s;
            proxy_read_timeout                      60s;

            proxy_redirect                          off;
            proxy_buffering                         off;
            proxy_buffer_size                       "4k";
            proxy_buffers                           4 "4k";

            proxy_http_version                      1.1;

            proxy_cookie_domain                     off;
            proxy_cookie_path                       off;

    rewrite /cluster/dashboard/(.*) /$1 break;
    rewrite /cluster/dashboard / break;
    proxy_pass http://kube-system-kubernetes-dashboard-80;

        }
        location / {
            set $proxy_upstream_name "upstream-default-backend";
            port_in_redirect off;

            client_max_body_size                    "1m";

            proxy_set_header Host                   $best_http_host;

            # Pass the extracted client certificate to the backend

            # Pass Real IP
            proxy_set_header X-Real-IP              $the_real_ip;

            # Allow websocket connections
            proxy_set_header                        Upgrade           $http_upgrade;
            proxy_set_header                        Connection        $connection_upgrade;

            proxy_set_header X-Real-IP              $the_real_ip;
            proxy_set_header X-Forwarded-For        $the_x_forwarded_for;
            proxy_set_header X-Forwarded-Host       $best_http_host;
            proxy_set_header X-Forwarded-Port       $pass_port;
            proxy_set_header X-Forwarded-Proto      $pass_access_scheme;
            proxy_set_header X-Original-URI         $request_uri;
            proxy_set_header X-Scheme               $pass_access_scheme;

            # mitigate HTTPoxy Vulnerability
            # https://www.nginx.com/blog/mitigating-the-httpoxy-vulnerability-with-nginx/
            proxy_set_header Proxy                  "";

            # Custom headers

            proxy_connect_timeout                   5s;
            proxy_send_timeout                      60s;
            proxy_read_timeout                      60s;

            proxy_redirect                          off;
            proxy_buffering                         off;
            proxy_buffer_size                       "4k";
            proxy_buffers                           4 "4k";

            proxy_http_version                      1.1;

            proxy_cookie_domain                     off;
            proxy_cookie_path                       off;

            proxy_pass http://upstream-default-backend;
        }

    }
    # default server, used for NGINX healthcheck and access to nginx stats
    server {
        # Use the port 18080 (random value just to avoid known ports) as default port for nginx.
        # Changing this value requires a change in:
        # https://github.com/kubernetes/contrib/blob/master/ingress/controllers/nginx/nginx/command.go#L104
        listen 18080 default_server reuseport backlog=511;
        listen [::]:18080 default_server reuseport backlog=511;
        set $proxy_upstream_name "-";

        location /healthz {
            access_log off;
            return 200;
        }

        location /nginx_status {
            set $proxy_upstream_name "internal";

            access_log off;
            stub_status on;
        }

        # this location is used to extract nginx metrics
        # using prometheus.
        # TODO: enable extraction for vts module.
        location /internal_nginx_status {
            set $proxy_upstream_name "internal";

            allow 127.0.0.1;
            allow ::1;
            deny all;

            access_log off;
            stub_status on;
        }

        location / {
            set $proxy_upstream_name "upstream-default-backend";
            proxy_pass             http://upstream-default-backend;
        }

    }

    # default server for services without endpoints
    server {
        listen 8181;
        set $proxy_upstream_name "-";

        location / {
            return 503;
        }
    }
}

stream {
    log_format log_stream [$time_local] $protocol $status $bytes_sent $bytes_received $session_time;

    access_log /var/log/nginx/access.log log_stream;

    error_log  /var/log/nginx/error.log;

    # TCP services
    upstream tcp-kube-system-openvpn-18443 {
        server                  10.56.1.112:443;
    }

    server {
        listen                  18443;
        proxy_pass              tcp-kube-system-openvpn-18443;
    }

    # UDP services
}

Source

troian

Most helpful comment

but only if liveness/readiness probes did not succeed.

There is nothing we can do to avoid 503 in that situation

aledbf on 7 Jun 2017

👍4

All 12 comments

I sometimes see the same problem and my guess is the controller does not pick up updated/new ingress rules populated in the meantime. (I think this started happening for me when going from nginx-ingress-controller:0.9.0-beta.5 to nginx-ingress-controller:0.9.0-beta.7)

The only thing working for me was to gradually restart the old nginx-ingress instances. The fresh ones work as expected.

Here is a bash-script, which does these restarts:

#!/bin/bash -
set -o nounset
BASE=$(cd "$(dirname "$0")" && pwd)
pushd "${BASE}"
for i in $(kubectl get pods -n kube-system | grep nginx-ingress-lb | awk '{print $1}')
do
  echo "will kill ${i}"
  kubectl delete "pod/${i}" -n kube-system

  echo "Waiting 30 seconds for new pod to come up before killing next old pod..."
  sleep 30
done

weitzj on 7 Jun 2017

👍1

@weitzj I wonder if this may be related to https://github.com/kubernetes/ingress/issues/768 - especially if a restart fixes the problem.

caseylucas on 7 Jun 2017

@weitzj please update the image to quay.io/aledbf/nginx-ingress-controller:0.132 (current master)

aledbf on 7 Jun 2017

@weitzj restart does not work for my case.
@aledbf does your ingress 0.132 contain something specific to that issue? Anyway I'll try it soon

troian on 7 Jun 2017

@troian the fix for 768 and PRs 822, 823 and 824

aledbf on 7 Jun 2017

@aledbf Your image quay.io/aledbf/nginx-ingress-controller:0.132 works for me.

The steps I took:

Use your image in my_nginx_controller.yaml
kubectl apply -f my_nginx_controller.yaml
restart the nginx pods (with my bash-script from above)
Using kubectl describe pod/nginx-ingress-... to see, whether your image is in use (it is by showing git-1ea89a61

Btw.:

The nginx controller runs using the cluster-admin Role for now, since I thought RBAC might be an issue.

weitzj on 7 Jun 2017

@aledbf thanks

The issue I wonder is why it produces Fake certificate even if --default-ssl-certificate specified in argument and ingress contains only one domain with same certificate chain

troian on 7 Jun 2017

@troian I also see these 503 timeouts with the current quay.io/aledbf/nginx-ingress-controller:0.132 - but only if liveness/readiness probes did not succeed.
But I guess this is the intended behaviour, which makes sense to me.

weitzj on 7 Jun 2017

but only if liveness/readiness probes did not succeed.

There is nothing we can do to avoid 503 in that situation

aledbf on 7 Jun 2017

👍4

@weitzj, @aledbf ok, make sense. I'm not familiar with that yet. Any particular reason they might not succeed? Even in 5 minutes after pod start
One of root-cause (presumably) that chrome shows such error if ingress returns Fake Certificate

troian on 7 Jun 2017

Seems image quay.io/aledbf/nginx-ingress-controller:0.132 helps.
Thanks everyone
Resolving

troian on 7 Jun 2017

I sometimes see the same problem and my guess is the controller does not pick up updated/new ingress rules populated in the meantime. (I think this started happening for me when going from nginx-ingress-controller:0.9.0-beta.5 to nginx-ingress-controller:0.9.0-beta.7)

The only thing working for me was to gradually restart the old nginx-ingress instances. The fresh ones work as expected.

Here is a bash-script, which does these restarts:
#!/bin/bash -
set -o nounset
BASE=$(cd "$(dirname "$0")" && pwd)
pushd "${BASE}"
for i in $(kubectl get pods -n kube-system | grep nginx-ingress-lb | awk '{print $1}')
do
  echo "will kill ${i}"
  kubectl delete "pod/${i}" -n kube-system

  echo "Waiting 30 seconds for new pod to come up before killing next old pod..."
  sleep 30
done
works then for minikube as well with

kubectl get pods -n kube-system --selector="app.kubernetes.io/name=nginx-ingress-controller" -oname

DerSalvador on 2 Jun 2019

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