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feat(observability-proxy): publish the proxy on its own host - #5267
Adds an optional public endpoint for the observability proxy, so that clients outside the cluster (kubectl, scripts, third-party tools) can call it directly with their Kubernetes bearer token. The existing paths do not deliver the token: kube-apiserver removes the Authorization header after it authenticates a request, so the service proxy of kube-apiserver cannot carry it, and the console route goes through the dashboard gatekeeper, which with OIDC enabled answers a client without a session cookie with 401 and exists only where the dashboard is published.
The endpoint is off by default. It is published at observability-proxy.<publishing.host> once observability-proxy is added to publishing.exposedServices, in the same two modes the dashboard uses:
gateway.enabled: false: an Ingress on the publishing ingress class, with a per-host cert-manager certificate, or the operator's wildcard certificate when publishing.certificates.wildcardSecretName is set (the TLS section stays, so HTTP is still redirected to HTTPS).
gateway.enabled: true: an HTTPRoute on the publishing tenant's Gateway. The platform now lists cozy-observability-proxy in gateway.attachedNamespaces so that the Gateway admits the route. A cluster that overrides gateway.attachedNamespaces replaces the whole list and has to add the namespace itself.
In Ingress mode the request crosses the publishing tenant's egress policies, which deny everything except the allow-to-* destinations, so the tenant chart gains allow-to-observability-proxy. It matches the whole cozy-observability-proxy namespace, as allow-to-linstor-gui does, because cert-manager runs the HTTP-01 solver pods for the proxy's certificate there.
The route passes the request through unchanged: no path rewrite and no authentication at the edge, so /apis/... and the bearer token reach the proxy as sent. The edge limits are set so that they never end a request before the proxy does:
The tenant ingress-nginx reads upstream with a 10s timeout by default, while the proxy allows a non-tail request up to --request-timeout (1m) and keeps a log tail open until it has been silent for --tail-idle-timeout. Before the first byte of a response, the token and access reviews can add up to another minute. The Ingress sets a 360s read timeout and keeps response buffering off, so tail lines reach the client as they arrive.
The Ingress sets a 1 MiB body limit, the same limit the proxy enforces on a request body.
On an HTTPRoute that sets no timeout, Cilium keeps Envoy's 15s route timeout, which would cut every tail. The route disables it (timeouts.request: 0s), because the proxy limits each request itself. Envoy's stream idle timeout (Cilium envoy.streamIdleTimeoutDurationSeconds, 300s by default) still applies and cannot be changed from an HTTPRoute, so the chart now runs the proxy with --tail-idle-timeout=4m30s instead of the 5m default. A tail that stops sending lines is then ended by the proxy as a complete response, not reset by Envoy. Before the first byte, slow token and access reviews together with a log store that never sends headers can still exceed 300s; that case ends in an error either way.
The proxy never reads the client address or X-Forwarded-*. All its limits and its logs use the authenticated user, so nothing changes behind an ingress and the client cannot spoof anything through headers.
Security
This adds a new internet-facing entry point when it is enabled. What protects it:
Every request to a tenant root needs a bearer token that kube-apiserver accepts through a TokenReview, and a SubjectAccessReview for the requested namespace. Paths the proxy does not serve return 404 before any review, and a request without a bearer token returns 401 without a review.
Per-user limits apply after authentication: request rate, concurrent requests, concurrent tails per user, and a total cap on open tails. Every request is bounded by the request timeout, and every tail by the idle timeout.
The body is capped at 1 MiB at the edge and in the proxy.
The new tenant egress policy lets every pod of a tenant open a connection to the proxy namespace, whether or not the proxy is published. This gives a tenant workload nothing it cannot already do through the published host, and the proxy asks for a token in both cases.
What it does not protect against: an unauthenticated client can make the proxy send one TokenReview per distinct token it invents. Rejected tokens are cached by hash for the auth cache TTL, so a repeated token costs nothing more. This is the same cost a client can already cause by calling the published Kubernetes API (api is in publishing.exposedServices by default). No per-IP rate limit is added at the edge, because with publishing.externalIPs the ingress Service uses externalTrafficPolicy: Cluster, which can hide client addresses behind node addresses, so a per-IP limit would throttle all clients together.
Screenshots
Not a UI change.
Downstream repositories
No downstream repository is affected by this change
The diff changes packages/core/platform/values.yaml, which reaches cozystack/website: content/en/docs/next/operations/configuration/platform-package.md lists the possible values of publishing.exposedServices and the default gateway.attachedNamespaces list, and both need the new entries. The observability-proxy documentation is tracked in cozystack/website#787, which does not cover the public endpoint yet; the endpoint and the new list entries will be added there once this PR is accepted. No other repository in the trigger map is reached by this diff.
Release note
feat(observability-proxy): the observability proxy can be published at observability-proxy.<host> for clients outside the cluster that use a Kubernetes bearer token. It is off by default; add `observability-proxy` to `publishing.exposedServices` to publish it, through an Ingress or, with `gateway.enabled`, an HTTPRoute. Clusters that override `gateway.attachedNamespaces` must add `cozy-observability-proxy` to it for the Gateway mode. Tenants gain an egress policy to the proxy namespace, which the Ingress mode needs.
Summary by CodeRabbit
New Features
Tenant workloads can now connect to the observability proxy.
The observability proxy can be published through an Ingress or Gateway route when enabled in the service exposure settings.
Proxy routing supports long-running requests and streams with adjusted timeout handling.
Ingress publishing supports per-host or wildcard certificates and configurable certificate challenge settings.
Clients outside the cluster, such as kubectl, scripts and third-party
tools, need to call the proxy with their Kubernetes bearer token. The
kube-apiserver service proxy cannot carry it: kube-apiserver drops the
Authorization header once it has authenticated the request. The console
route sits behind the dashboard gatekeeper, which with OIDC enabled
answers an API client that has no session cookie with 401, and exists
only where the dashboard itself is published. A route straight to the proxy
Service is the path that keeps the token.
It stays off until "observability-proxy" is listed in
publishing.exposedServices, and follows the dashboard for TLS and for
the Ingress versus Gateway API switch.
The edge must not end a request the proxy still serves. The tenant
ingress-nginx reads upstream with a 10s timeout, while a log tail may
stay silent for the proxy's 5m idle limit, so the Ingress waits longer
than that. Cilium leaves Envoy's 15s route timeout in place on an
HTTPRoute that sets none, which would cut every tail, so the route
disables it: the proxy bounds each request on its own.
Assisted-by: LLM
Signed-off-by: Maxim Belyy <[email protected]>
With the Gateway API enabled, the publishing Gateway admits routes only
from the publishing tenant and the namespaces in
gateway.attachedNamespaces. The observability proxy publishes its
HTTPRoute from its own namespace, so without an entry the route renders
and is never served.
Clusters that override gateway.attachedNamespaces replace the whole
list and have to add the namespace themselves.
Assisted-by: LLM
Signed-off-by: Maxim Belyy <[email protected]>
The observability proxy's Ingress is served by the ingress controller
in the publishing tenant, and tenant egress is denied except for the
allow-to-* policies. Without one for the proxy namespace, every request
through the Ingress and every HTTP-01 challenge for its certificate
times out at the controller.
The policy matches the whole namespace because cert-manager runs the
HTTP-01 solver pods there, next to the proxy.
Assisted-by: LLM
Signed-off-by: Maxim Belyy <[email protected]>
Behind a Cilium Gateway, Envoy resets a stream that carries no data for
300s, the default stream idle timeout, and the proxy's own tail idle
limit was the same 5m. A tail that went quiet could then be cut by
Envoy rather than ended by the proxy, which the client sees as a reset
stream instead of a finished response. The HTTPRoute cannot raise
Envoy's limit, so the proxy ends a silent tail a little earlier.
Assisted-by: LLM
Signed-off-by: Maxim Belyy <[email protected]>
No actionable comments were generated in the recent review.
Walkthrough
The change adds tenant egress access to observability-proxy, allows its namespace to attach routes to the Gateway, configures a proxy tail idle timeout, and adds conditional Ingress and HTTPRoute resources.
Changes: Observability proxy exposure
Layer / File(s)
Summary
Tenant egress and Gateway attachment packages/apps/tenant/templates/networkpolicy.yaml, packages/apps/tenant/tests/networkpolicy_observability_proxy_test.yaml, packages/core/platform/values.yaml, packages/core/platform/tests/observability_proxy_wiring_test.yaml
Adds tenant egress to the proxy namespace and adds that namespace to Gateway route attachments. Tests cover root and nested tenant policies, the isp-hosted case, and the rendered attachment value.
Adds --tail-idle-timeout=4m30s to the proxy container arguments and tests for the argument.
Ingress and Gateway publication packages/system/observability-proxy/templates/httproute.yaml, packages/system/observability-proxy/templates/ingress.yaml, packages/system/observability-proxy/tests/publishing_test.yaml
Adds conditional HTTPRoute and Ingress resources for the proxy. Tests cover exposure conditions, route configuration, certificate settings, and Gateway attachment.
This change optionally publishes the observability proxy on its own host. It is off by default, and no concrete merge-blocking risk was found.
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The title "feat(observability-proxy): publish the proxy on its own host" matches the main change. The PR adds an optional public endpoint at observability-proxy.<publishing.host>, exposed through an I…
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The title "feat(observability-proxy): publish the proxy on its own host" matches the main change. The PR adds an optional public endpoint at observability-proxy.<publishing.host>, exposed through an Ingress or an HTTPRoute, and the changed templates, values, and tests all implement that publishing path. The title is specific and uses the conventional commit form.
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Maxim Kitsunoff (@kitsunoff) LGTM, CI and E2E are green on this head. Optional: the description still says this depends on #5214, which is merged now, so that line can go.
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Maxim Kitsunoff (@kitsunoff) LGTM, CI and E2E are green on this head. I merged main into the branch after #5219 landed: the deployment and its test now carry both your --tail-idle-timeout and the metrics store flags from main. Optional: the description still says this depends on #5214, which is merged, so that line can go.
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Aleksei Sviridkin (lexfrei)
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What this PR does
Adds an optional public endpoint for the observability proxy, so that clients outside the cluster (kubectl, scripts, third-party tools) can call it directly with their Kubernetes bearer token. The existing paths do not deliver the token: kube-apiserver removes the
Authorizationheader after it authenticates a request, so the service proxy of kube-apiserver cannot carry it, and the console route goes through the dashboard gatekeeper, which with OIDC enabled answers a client without a session cookie with 401 and exists only where the dashboard is published.The endpoint is off by default. It is published at
observability-proxy.<publishing.host>onceobservability-proxyis added topublishing.exposedServices, in the same two modes the dashboard uses:gateway.enabled: false: an Ingress on the publishing ingress class, with a per-host cert-manager certificate, or the operator's wildcard certificate whenpublishing.certificates.wildcardSecretNameis set (the TLS section stays, so HTTP is still redirected to HTTPS).gateway.enabled: true: an HTTPRoute on the publishing tenant's Gateway. The platform now listscozy-observability-proxyingateway.attachedNamespacesso that the Gateway admits the route. A cluster that overridesgateway.attachedNamespacesreplaces the whole list and has to add the namespace itself.In Ingress mode the request crosses the publishing tenant's egress policies, which deny everything except the
allow-to-*destinations, so the tenant chart gainsallow-to-observability-proxy. It matches the wholecozy-observability-proxynamespace, asallow-to-linstor-guidoes, because cert-manager runs the HTTP-01 solver pods for the proxy's certificate there.The route passes the request through unchanged: no path rewrite and no authentication at the edge, so
/apis/...and the bearer token reach the proxy as sent. The edge limits are set so that they never end a request before the proxy does:--request-timeout(1m) and keeps a log tail open until it has been silent for--tail-idle-timeout. Before the first byte of a response, the token and access reviews can add up to another minute. The Ingress sets a 360s read timeout and keeps response buffering off, so tail lines reach the client as they arrive.timeouts.request: 0s), because the proxy limits each request itself. Envoy's stream idle timeout (Ciliumenvoy.streamIdleTimeoutDurationSeconds, 300s by default) still applies and cannot be changed from an HTTPRoute, so the chart now runs the proxy with--tail-idle-timeout=4m30sinstead of the 5m default. A tail that stops sending lines is then ended by the proxy as a complete response, not reset by Envoy. Before the first byte, slow token and access reviews together with a log store that never sends headers can still exceed 300s; that case ends in an error either way.The proxy never reads the client address or
X-Forwarded-*. All its limits and its logs use the authenticated user, so nothing changes behind an ingress and the client cannot spoof anything through headers.Security
This adds a new internet-facing entry point when it is enabled. What protects it:
What it does not protect against: an unauthenticated client can make the proxy send one TokenReview per distinct token it invents. Rejected tokens are cached by hash for the auth cache TTL, so a repeated token costs nothing more. This is the same cost a client can already cause by calling the published Kubernetes API (
apiis inpublishing.exposedServicesby default). No per-IP rate limit is added at the edge, because withpublishing.externalIPsthe ingress Service usesexternalTrafficPolicy: Cluster, which can hide client addresses behind node addresses, so a per-IP limit would throttle all clients together.Screenshots
Not a UI change.
Downstream repositories
The diff changes
packages/core/platform/values.yaml, which reaches cozystack/website:content/en/docs/next/operations/configuration/platform-package.mdlists the possible values ofpublishing.exposedServicesand the defaultgateway.attachedNamespaceslist, and both need the new entries. The observability-proxy documentation is tracked in cozystack/website#787, which does not cover the public endpoint yet; the endpoint and the new list entries will be added there once this PR is accepted. No other repository in the trigger map is reached by this diff.Release note
Summary by CodeRabbit