Fwd: help websockets

[Alison]

Hi,

I'm using the following ingress in my jupyterhub application to expose the
application externally from within the cluster:

################

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
    name: py-ingress
    annotations:
        kubernetes.io/ingress.class: nginx
        nginx.ingress.kubernetes.io/rewrite-target: /jupyterhub$1$2
    namespace: default
spec:
    rules:
        - http:
            paths:
               - path: /jupyterhub(/|$)(.*)
                 backend:
                    serviceName: jupyterhub
                    servicePort: 8888


#################

When I deploy my application to one kubernetes cluster it works without
problems.

If I deploy the same application to another kubernetes cluster it fails
(due to http 400 websockets). The part that fails is when I try from the
Jupyter Notebook .... New ->Terminal ... or .... New -> Python3 kernel

Any idea of what kind of additional annotations I need to add to the above
ingress to solve the websocket issue ?

https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/

The nginx.conf content looks as follows for the application in both clusters

#########################

location ~* "^/jupyterhub(/|$)(.*)"  {
      set $namespace  "default";
      set $ingress_name "py-ingress";
      set $service_name "";
      set $service_port "";
set $location_path "/jupyterhub(/|$(literal_dollar))(.*)";

      rewrite_by_lua_block {
           lua_ingress_rewrite({
                 force_ssl_redirect = false,
                 ssl_redirect = true,
                 force_no_ssl_redirect = false,
                 use_port_in_redirects = false,
          })
          balancer.rewrite()
          plugins.run()
     }

     header_filter_by_lua_block {
          lua_ingress.header()
          plugins.run()
     }

     body_filter_by_lua_block {
     }

     log_by_lua_block {
          balacer.log()

          monitor.call()

           plugins.run()
     }

     port_in_redirect off;

     set $balancer_ewma_score -1;
     set $proxy_upstream_name "default-jupyterhub-8888";
     set $proxy_host $proxy_upstream_name;
     set $pass_access_scheme $scheme;
     set $pass_server_port $server_port;
     set $best_http_host $http_host;
     set $pass_port $pass_server_port;
     set $proxy_alternative_upstream_name "";
     client_max_bosy_size 1m;
     proxy_set_header Host $best_http_host;

     # Allow websocket connections

     proxy_set_header Upgrade $http_upgrade;
     proxy_set_header Connection $connection_upgrade;
     proxy_set_header X-Request-ID $req_id;
     proxy_set_header X-Real-IP $remote_addr;
     proxy_set_header X-Forwarded-For $remote_addr;
     proxy_set_header X-Forwarded-Proto $pass_access_scheme;
     proxy_set_header X-Forwarded-Host $best_http_host;
     proxy_set_header X-Forwarded-Port $pass_port;
     proxy_set_header X-Scheme $pass_access_scheme;
     proxy_set_header X-Original-Forwarded-For $http_x_forwarded_for;
     proxy_set_header Proxy
     proxy_connect_timeout 5s;
     proxy_send_timeout 60s;
     proxy_buffering off;
     proxy_buffer_size 4k;
     proxy_buffers 4 4k;
     proxy_max_temp_file_size 1024m;
     proxy_request_buffering on;
     proxy_http_version 1.1;
     proxy_cookie_domain off;
     proxy_cookie_path off;
     proxy_next_upstream error timeout;
     proxy_next_upstream_timeout 0;
     proxy_next_upstream_tries 3;

     rewrite "(?i)/jupyterhub (/|$)(.*)" /jupyter$1$2 break;

     proxy_pass http://upstream_balancer;

     proxy_redirect off;

}

##########################

Thank you very much,

Alison
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