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docs: clarify ingress-nginx integration and remove Lua block example for oauth2-proxy 

This PR revises the integration guide for oauth2-proxy with ingress-nginx in Kubernetes:

Recommends the minimal configuration: just auth-url and auth-signin annotations.
Removes the Lua block example, as it did not work in practice despite following nginx documentation and extensive testing.
Clearly states that the official ingress-nginx external auth example is the recommended approach for most users.
Notes that advanced Lua/cookie handling is only needed for rare, advanced scenarios.

Signed-off-by: Jan Larwig <jan@larwig.com>
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Schmitt Paul 2025-09-23 16:18:43 +02:00 committed by Jan Larwig
parent ea1dc3f606
commit 1e4977d8b3
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docs/docs/configuration/integration.md
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@ -77,23 +77,15 @@ server {
}
```
When you use ingress-nginx in Kubernetes, you MUST use `kubernetes/ingress-nginx` (which includes the Lua module) and the following configuration snippet for your `Ingress`.
Variables set with `auth_request_set` are not `set`-able in plain nginx config when the location is processed via `proxy_pass` and then may only be processed by Lua.
Note that `nginxinc/kubernetes-ingress` does not include the Lua module.
When you use ingress-nginx in Kubernetes, you can configure the same behavior with the following annotations on your Ingress resource:
```yaml
nginx.ingress.kubernetes.io/auth-response-headers: Authorization
nginx.ingress.kubernetes.io/auth-signin: https://$host/oauth2/start?rd=$escaped_request_uri
nginx.ingress.kubernetes.io/auth-url: https://$host/oauth2/auth
nginx.ingress.kubernetes.io/configuration-snippet: |
auth_request_set $name_upstream_1 $upstream_cookie_name_1;
access_by_lua_block {
if ngx.var.name_upstream_1 ~= "" then
ngx.header["Set-Cookie"] = "name_1=" .. ngx.var.name_upstream_1 .. ngx.var.auth_cookie:match("(; .*)")
end
}
nginx.ingress.kubernetes.io/auth-url: "https://<oauth2-proxy-fqdn>/oauth2/auth"
nginx.ingress.kubernetes.io/auth-signin: "https://<oauth2-proxy-fqdn>/oauth2/start?rd=$escaped_request_uri"
```
This minimal configuration works for standard authentication flows. Lua/cookie handling is only needed for advanced scenarios (e.g., multi-part cookies, custom session logic). See the official ingress-nginx example: https://kubernetes.github.io/ingress-nginx/examples/auth/oauth-external-auth/.
It is recommended to use `--session-store-type=redis` when expecting large sessions/OIDC tokens (_e.g._ with MS Azure).
You have to substitute *name* with the actual cookie name you configured via --cookie-name parameter. If you don't set a custom cookie name the variable should be "$upstream_cookie__oauth2_proxy_1" instead of "$upstream_cookie_name_1" and the new cookie-name should be "_oauth2_proxy_1=" instead of "name_1=".