From 98b03704d7445aba632c1729113f64717e85a41f Mon Sep 17 00:00:00 2001
From: Masaki Yatsu <yatsu@yatsu.info>
Date: Fri, 5 Dec 2025 10:09:21 +0900
Subject: [PATCH] fix(jupyterhub): set sticky sessions for websocket

---
 jupyterhub/jupyterhub-values.gomplate.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/jupyterhub/jupyterhub-values.gomplate.yaml b/jupyterhub/jupyterhub-values.gomplate.yaml
index 2ce98e2..39165d1 100644
--- a/jupyterhub/jupyterhub-values.gomplate.yaml
+++ b/jupyterhub/jupyterhub-values.gomplate.yaml
@@ -445,6 +445,10 @@ ingress:
   annotations:
     kubernetes.io/ingress.class: traefik
     traefik.ingress.kubernetes.io/router.entrypoints: websecure
+    # Enable sticky sessions for WebSocket connections (required for Jupyter RTC/MCP)
+    traefik.ingress.kubernetes.io/service.sticky.cookie: "true"
+    traefik.ingress.kubernetes.io/service.sticky.cookie.name: jupyter-session
+    traefik.ingress.kubernetes.io/service.sticky.cookie.secure: "true"
   ingressClassName: traefik
   hosts:
     - {{ .Env.JUPYTERHUB_HOST }}