authenticate session not found in Keycloak-Gatekeeper configuration - kubernetes

Question

I am trying to use keycloak as my identity provider for accessing the k8s dashboard. I use keycloak-gatekeeper to authenticate.
My keycloak config file is as follows on my pod pod1
apiVersion: apps/v1
kind: Deployment
metadata:
name: db
namespace: kubernetes-dashboard
spec:
replicas: 1
selector:
matchLabels:
app: db
template:
metadata:
labels:
app: db
spec:
containers:
- name: gatekeeper
image: carlosedp/keycloak-gatekeeper:latest
args:
- --config=/etc/keycloak-gatekeeper.conf
ports:
- containerPort: 3000
name: service
volumeMounts:
- name: gatekeeper-config
mountPath: /etc/keycloak-gatekeeper.conf
subPath: keycloak-gatekeeper.conf
- name: gatekeeper-files
mountPath: /html
volumes:
- name : gatekeeper-config
configMap:
name: gatekeeper-config
- name : gatekeeper-files
configMap:
name: gatekeeper-files
---
apiVersion: v1
kind: ConfigMap
metadata:
name: gatekeeper-config
namespace: kubernetes-dashboard
creationTimestamp: null
data:
keycloak-gatekeeper.conf: |+
discovery-url: http://keycloak.<IP>.nip.io:8080/auth/realms/k8s-realm
skip-openid-provider-tls-verify: true
client-id: k8s-client
client-secret: <SECRET>
listen: 0.0.0.0:3000
debug: true
ingress.enabled: true
enable-refresh-tokens: true
enable-logging: true
enable-json-logging: true
redirection-url: http://k8s.dashboard.com/dashboard/
secure-cookie: false
encryption-key: vGcLt8ZUdPX5fXhtLZaPHZkGWHZrT6aa
enable-encrypted-token: false
upstream-url: http://127.0.0.0:80
forbidden-page: /html/access-forbidden.html
headers:
Bearer : <bearer token>
resources:
- uri: /*
groups:
- k8s-group
---
apiVersion: v1
kind: ConfigMap
metadata:
name: gatekeeper-files
namespace: kubernetes-dashboard
creationTimestamp: null
data:
access-forbidden.html: html file
---
apiVersion: v1
kind: Service
metadata:
labels:
app: db
name: db
namespace: kubernetes-dashboard
spec:
ports:
- name: http
port: 80
protocol: TCP
targetPort: service
selector:
app: db
type: ClusterIP
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: db
namespace: kubernetes-dashboard
annotations:
kubernetes.io/ingress.class: "nginx"
nginx.ingress.kubernetes.io/rewrite-target: /
nginx.ingress.kubernetes.io/proxy-buffer-size: "64k"
spec:
rules:
- host: k8s.dashboard.com
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: db
port:
number: 80
when I am accessing k8s.dashboard.com I am getting this URL and it is navigating me to the keycloak page for authentication.
http://keycloak.<IP>.nip.io:8080/auth/realms/k8s-realm/protocol/openid-connect/auth?client_id=k8s-client&redirect_uri=http%3A%2F%2Fk8s.dashboard.com%2Fdashboard%2Foauth%2Fcallback&response_type=code&scope=openid+email+profile&state=23c4b0ff-259f-45c0-934a-98fc780363e6
After logging in to the keycloak, it is throwing me 404 page and the URL which is redirecting is
http://k8s.dashboard.com/dashboard/oauth/callback?state=23c4b0ff-259f-45c0-934a-98fc780363e6&session_state=4c698f90-4e03-44a9-b231-01a418f0d569&code=9ab6a309-98ad-4d61-989f-116f0b151522.4c698f90-4e03-44a9-b231-01a418f0d569.520395c1-d601-4502-981a-b1c08861ab3d
As you can see the extra /oauth/callback endpoint is added after k8s.dashboard.com/dashboard. If I remove /oauth/callback then it will redirect me to k8s dashboard login page.
My pod log file is as follows:
{"level":"info","ts":1626074166.8771496,"msg":"client request","latency":0.000162174,"status":307,"bytes":95,"client_ip":"172.17.0.8:43276","method":"GET","path":"/favicon.ico"}
{"level":"info","ts":1626074166.9270697,"msg":"client request","latency":0.000054857,"status":307,"bytes":330,"client_ip":"172.17.0.8:43276","method":"GET","path":"/oauth/authorize"}
{"level":"error","ts":1626074176.2642884,"msg":"no session found in request, redirecting for authorization","error":"authentication session not found"}
{"level":"info","ts":1626074176.264481,"msg":"client request","latency":0.000197256,"status":307,"bytes":95,"client_ip":"172.17.0.8:43276","method":"GET","path":"/"}
{"level":"info","ts":1626074176.2680361,"msg":"client request","latency":0.000041917,"status":307,"bytes":330,"client_ip":"172.17.0.8:43276","method":"GET","path":"/oauth/authorize"}
{"level":"error","ts":1626074185.140641,"msg":"no session found in request, redirecting for authorization","error":"authentication session not found"}
{"level":"info","ts":1626074185.1407247,"msg":"client request","latency":0.000091046,"status":307,"bytes":95,"client_ip":"172.17.0.8:43276","method":"GET","path":"/"}
{"level":"info","ts":1626074185.1444902,"msg":"client request","latency":0.000042129,"status":307,"bytes":330,"client_ip":"172.17.0.8:43276","method":"GET","path":"/oauth/authorize"}
{"level":"error","ts":1626074202.1827211,"msg":"no session found in request, redirecting for authorization","error":"authentication session not found"}
{"level":"info","ts":1626074202.182838,"msg":"client request","latency":0.000122802,"status":307,"bytes":95,"client_ip":"172.17.0.8:43276","method":"GET","path":"/favicon.ico"}
{"level":"info","ts":1626074202.1899397,"msg":"client request","latency":0.000032541,"status":307,"bytes":330,"client_ip":"172.17.0.8:43276","method":"GET","path":"/oauth/authorize"}
What is wrong here? Any help will be appreciated!