OCPBUGS-105459: Remove kube-rbac-proxy sidecar and enable native TLS metrics in daemon - #771
OCPBUGS-105459: Remove kube-rbac-proxy sidecar and enable native TLS metrics in daemon#771asood-rh wants to merge 1 commit into
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@asood-rh: This pull request references Jira Issue OCPBUGS-105459, which is invalid:
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Included review availability: Your plan provides up to 12 included reviews per hour; 11 remain after this review. WalkthroughThe daemon now serves authenticated metrics directly over HTTPS on port 39401. It uses rendered TLS settings and mounted certificates. The kube-rbac-proxy sidecar and related configuration are removed. RBAC, tests, documentation, and CI scripts are updated. ChangesNative TLS metrics serving
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The daemon now serves metrics directly, but its container still lacks standard security hardening and resource limits, leaving a bounded defense-in-depth and resource-isolation risk. The change is mergeable with explicit owner awareness or follow-up. Sequence Diagram(s)sequenceDiagram
participant MetricsClient
participant ServiceAccount
participant Daemon
MetricsClient->>ServiceAccount: Read bearer token
ServiceAccount-->>MetricsClient: Return bearer token
MetricsClient->>Daemon: Send authenticated HTTPS request to port 39401
Daemon-->>MetricsClient: Return metrics
Possibly related PRs
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✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@bindata/manifests/daemon/daemonset.yaml`:
- Around line 29-32: Update the DaemonSet metrics TLS startup flow to wait for
tls.crt and tls.key before enabling secure metrics, or provide a GetCertificate
implementation that supports certificates appearing later. Remove or justify
hostNetwork and hostPID, add pod/container security contexts with only required
capabilities, set CPU and memory limits for both containers, and add liveness
and readiness probes. Add a namespace-scoped NetworkPolicy and replace the
privileged SCC binding with a restricted or narrowly scoped custom SCC.
Apply the same fix in `@bindata/manifests/daemon/daemonset.yaml` around lines 29 -
57.
In `@test/e2e/functional/tests/e2e.go`:
- Line 1371: Update both /metrics requests in test/e2e/functional/tests/e2e.go
to use an authorized bearer token with GET permission for the non-resource URL,
rather than anonymous curl calls. Document the authenticated command and
required RBAC permission in README.md at line 317, ensuring the daemon service
account has that permission.
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README.mdbindata/manifests/daemon/daemonset.yamlbundle/manifests/ingress-node-firewall-daemon-clusterrole-extra_rbac.authorization.k8s.io_v1_clusterrole.yamlbundle/manifests/ingress-node-firewall.clusterserviceversion.yamlcmd/daemon/daemon.goconfig/default/manager_auth_proxy_patch.yamlcontrollers/ingressnodefirewallconfig_controller.gocontrollers/ingressnodefirewallconfig_controller_test.gocontrollers/suite_test.gomain.gomanifests/stable/ingress-node-firewall-daemon-clusterrole-extra_rbac.authorization.k8s.io_v1_clusterrole.yamlmanifests/stable/ingress-node-firewall.clusterserviceversion.yamltest/e2e/functional/tests/e2e.gotest/e2e/tls/tls.go
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- bundle/manifests/ingress-node-firewall.clusterserviceversion.yaml
- manifests/stable/ingress-node-firewall.clusterserviceversion.yaml
- config/default/manager_auth_proxy_patch.yaml
- controllers/ingressnodefirewallconfig_controller_test.go
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Inline comments:
In `@README.md`:
- Line 315: Update the README instruction’s compound modifier from “Prometheus
formatted” to “Prometheus-formatted,” preserving the surrounding metrics
retrieval text and permission details.
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README.mdbindata/manifests/daemon/daemonset.yamlbundle/manifests/ingress-node-firewall-daemon-clusterrole-extra_rbac.authorization.k8s.io_v1_clusterrole.yamlcmd/daemon/daemon.gomanifests/stable/ingress-node-firewall-daemon-clusterrole-extra_rbac.authorization.k8s.io_v1_clusterrole.yamlopenshift-ci/deploy_ingress_node_firewall.shtest/e2e/functional/tests/e2e.go
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@danwinship @knobunc @tpantelis Please help review |
| if err != nil { | ||
| setupLog.Error(err, "unable to get TLS profile options") | ||
| os.Exit(1) | ||
| } |
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The daemon is an operand of the ingress node firewall operator so I think we should pass the TLS flags as args as was done with the kube-rbac-proxy sidecar, ie
{{- if .TLSMinVersion }}
--tls-min-version={{.TLSMinVersion}} \
{{- end }}
{{- if .TLSCipherSuites }}
--tls-cipher-suites={{.TLSCipherSuites}} \
{{- else }}
--tls-cipher-suites=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_RSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 \
{{- end }}
It won't need the apiservers RBAC perm either.
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To address the issue noted by CodeRabbit where the Secret is absent at startup, we could set optional to false here. Then the pod won't start until the Secret exists. This is simpler than the newDeferredCertProvider. I believe the comment above is incorrect (or perhaps used to be the behavior), ie once the Openshift service-ca operator sees the serving cert annotation, it creates the Secret immediately. Also I did the same with the ingress node firewall operator and it's been working fine with optional: false. It might delay the initial startup of the pod but that should be negligible.
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Inline comments:
In `@cmd/daemon/daemon.go`:
- Around line 220-224: Update cipherSuiteID to resolve names exclusively from
tls.CipherSuites(), removing the iteration over tls.InsecureCipherSuites(),
while preserving the existing ID-and-success return behavior.
In `@controllers/ingressnodefirewallconfig_controller_test.go`:
- Around line 81-85: Update the TLS assertions around the default and related
configuration cases to poll the rendered DaemonSet rather than reading arguments
immediately after awaitDaemonset. Repeatedly Get the DaemonSet, extract the
container arguments with getContainerArgs, and continue until the expected TLS
cipher-suite or minimum-version arguments are present, avoiding assertions
against a stale pod template.
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README.mdbindata/manifests/daemon/daemonset.yamlbundle/manifests/ingress-node-firewall-daemon-clusterrole-extra_rbac.authorization.k8s.io_v1_clusterrole.yamlcmd/daemon/daemon.gocontrollers/ingressnodefirewallconfig_controller.gocontrollers/ingressnodefirewallconfig_controller_test.gocontrollers/suite_test.gomain.gomanifests/stable/ingress-node-firewall-daemon-clusterrole-extra_rbac.authorization.k8s.io_v1_clusterrole.yaml
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- manifests/stable/ingress-node-firewall-daemon-clusterrole-extra_rbac.authorization.k8s.io_v1_clusterrole.yaml
- bundle/manifests/ingress-node-firewall-daemon-clusterrole-extra_rbac.authorization.k8s.io_v1_clusterrole.yaml
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- README.md
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| tlsOpts = append(tlsOpts, func(c *tls.Config) { | ||
| c.CipherSuites = ids | ||
| }) | ||
| } |
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There's utilities for parsing TLS flags suitable for tls.Config:
import cliflag "k8s.io/component-base/cli/flag"
...
minVersionID, err := cliflag.TLSVersion(tlsMinVersion)
if err != nil {
return nil, err
}
cipherSuiteIDs, err := cliflag.TLSCipherSuites(strings.Split(tlsCipherSuites, ","))
if err != nil {
return nil, err
}
tlsOpts := []func(*tls.Config){
func(c *tls.Config) {
c.MinVersion = minVersionID
c.CipherSuites = cipherSuiteIDs
},
}There was a problem hiding this comment.
Using k8s utility for parsing TLS flags.
| - --metrics-cert-dir=/etc/pki/tls/metrics-certs | ||
| - --metrics-secure=true | ||
| - '--tls-min-version={{.TLSMinVersion}}' | ||
| - '--tls-cipher-suites={{default "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384" .TLSCipherSuites}}' |
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Why the surrounding single quotes?
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Single quotes to avoid breaking YAML parsing due to embedded double quotes in the curl braces. For .TLSMinVersion for consistency purpose. Tested it out parsing, so will remove them.
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Fixed by removing single quotes.
| # Must be optional because the ingress-node-firewall-daemon-metrics-certs is a service serving | ||
| # certificate and those cannot be generated without the daemon running |
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Can you remove these comment as they no longer apply?
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It is already removed when optional was set to false.
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/test ingress-node-firewall-e2e-metal-ipi |
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@tpantelis E2E tests passed but failing at step not related to these changes. 1. Extension test (infw-extension step):
error: resource mapping not found for name: "infw-extensions"
no matches for kind "TestExtensionAdmission" in version "testextension.redhat.io/v1"
ensure CRDs are installed first
- Trying to create a TestExtensionAdmission CR
- The CRD doesn't exist on the cluster
- This is a separate feature test, not part of core ingress-node-firewall functionality
@anuragthehatter Did any related to OTE merged in the repo? |
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/lgtm |
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@danwinship @knobunc Could you help merge this PR as this needs to back ported to 5.0 otherwise will be blocked for testing ingress node firewall. This is release blocker bug fix. Thanks! |
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Thanks @asood-rh /lgtm |
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[APPROVALNOTIFIER] This PR is NOT APPROVED This pull-request has been approved by: asood-rh, prb112, tpantelis The full list of commands accepted by this bot can be found here. DetailsNeeds approval from an approver in each of these files:Approvers can indicate their approval by writing |
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It seems the root cause issue is that |
Alternatively it is fine to remove the side car for the following reasons:- 1. Less overhead: No sidecar container (saves memory, CPU, pod scheduling complexity) 2. Simpler deployment: One container vs two 3. Direct control: TLS config in the code, not in proxy config 4. Maintained by controller-runtime: Red Hat actively maintains this path 5. Same security: filters.WithAuthenticationAndAuthorization provides identical bearer token + RBAC enforcement 6. Future-proof: This is the direction OpenShift is moving |
That's fine for 5.1 but perhaps we should add the image-reference back and keep the |
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/verified by CI No additional tests needed for the code change.
[OCPFeatureGate:TLSAdherence][Serial] TLS Profile Compliance - should verify ingress-node-firewall TLS compliance across all profiles
This test validates the TLS race condition fix by checking all three TLS profile scenarios:
1. Modern + LegacyAdheringComponentsOnly (TLS 1.2 and 1.3 both work)
2. Modern + StrictAllComponents (TLS 1.3 only, TLS 1.2 rejected)
3. Intermediate + StrictAllComponents (TLS 1.2 and 1.3 both work) ← This is the critical test case
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Please squash the commits. The PR should just reflect the changes that are being made, not the chain of events that led there.
| value: '{{.EBPFProgramManagerMode}}' | ||
| ports: | ||
| - containerPort: 39401 | ||
| name: https |
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| name: https | |
| name: metrics |
| initialDelaySeconds: 15 | ||
| periodSeconds: 20 | ||
| timeoutSeconds: 3 | ||
| readinessProbe: |
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where did the liveness and readiness probes come from / why are they being added as part of this PR?
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They were not there but were added. Without them
1. No automatic failure detection - If the daemon deadlocks or the health endpoint stops responding, the pod stays "Running" forever 2. No automatic restarts - Without liveness probes, failed pods won't be restarted by kubelet 3. Immediate traffic during rollouts - Without readiness probes, pods are considered ready the instant they start, even if initialization isn't complete 4. Manual intervention required - When things break, you have to manually identify and delete bad pods
| secret: | ||
| secretName: ingress-node-firewall-daemon-metrics-certs | ||
| optional: true | ||
| optional: false |
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you can just remove this; not-optional is the default
| - name: EBPF_MANAGEMENT_MODE | ||
| value: '{{.EBPFProgramManagerMode}}' | ||
| ports: | ||
| - containerPort: 39401 |
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Before, there was an http metrics listener on 127.0.0.1:39401, which was re-exported via https on :9301 by the kube-rbac-proxy. It's the second port that you want to preserve. The higher-numbered port may be firewalled and inaccessible to other nodes, but we require ports 9000-9999 to be unfirewalled.
(Note that the 39xxx and 9xxx ports don't match here: 39401 vs 9301. That's probably a mistake but it doesn't matter any more. Stick with 9301.)
| flag.BoolVar(&enableHTTP2, "enable-http2", false, "If HTTP/2 should be enabled for the metrics server.") | ||
| flag.StringVar(&tlsMinVersion, "tls-min-version", "", "Minimum TLS version for the metrics endpoint (e.g. VersionTLS12, VersionTLS13).") | ||
| flag.StringVar(&tlsCipherSuites, "tls-cipher-suites", "", "Comma-separated list of TLS cipher suites for the metrics endpoint.") |
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if these flags only affect metrics they should have metrics- in their names like metrics-secure
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||
| var _ = AfterEach(func() { | ||
| // Reset the TLS profile spec to prevent test cross-contamination | ||
| tlsProfileSpec.Store((*configv1.TLSProfileSpec)(nil)) |
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I'd leave this comment. It seems useful.
| desired_ds_num=$(oc get ds -n "$NAMESPACE" ingress-node-firewall-daemon -o jsonpath="{.status.desiredNumberScheduled}") | ||
| ready_ds_num=$(oc get ds -n "$NAMESPACE" ingress-node-firewall-daemon -o jsonpath="{.status.numberReady}") | ||
| desired_ds_num=$(oc get ds -n "$NAMESPACE" ingress-node-firewall-daemon -o jsonpath="{.status.desiredNumberScheduled}" 2>/dev/null || echo "0") | ||
| ready_ds_num=$(oc get ds -n "$NAMESPACE" ingress-node-firewall-daemon -o jsonpath="{.status.numberReady}" 2>/dev/null || echo "0") |
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The 2>/dev/null || echo "0" pattern ensures the script doesn't crash or spam errors during the normal "resource doesn't exist yet" phase.
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…metrics in daemon Replace the kube-rbac-proxy sidecar container with controller-runtime's built-in TLS serving for the daemon metrics endpoint. The daemon now handles TLS termination, authentication, and authorization directly using the cluster's TLS profile configuration. - Add TLS flags and secure metrics serving to cmd/daemon/daemon.go - Remove kube-rbac-proxy container from daemon daemonset manifest - Remove KUBE_RBAC_PROXY_IMAGE references from controller, main.go, and CSV - Add config.openshift.io/apiservers RBAC for daemon to read TLS profile - Delete orphaned config/default/manager_auth_proxy_patch.yaml - Update e2e TLS tests to target daemon container directly on port 39401 Signed-off-by: Arti Sood <asood@redhat.com> Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Fixes: https://redhat.atlassian.net/browse/OCPBUGS-105459
Replace the kube-rbac-proxy sidecar container with controller-runtime's built-in TLS serving for the daemon metrics endpoint. The daemon now handles TLS termination, authentication, and authorization directly using the cluster's TLS profile configuration.
- What this PR does and why is it needed
As part https://redhat.atlassian.net/browse/CORENET-7108 implementation for TLS was done for controller that involved removal of kube-rbac-proxy sidecar. The sidecar was not removed for daemonset that resulted in causing the bug where ingress node firewall operator could be installed on ppc64le but daemonset could not be created.
- Special notes for reviewers
The changes are only for ingress node firewall daemonset as controller already has TLS support.
- How to verify it
No additional tests added but existing tests modified.
make test
make test-race
go test ./controllers/... -count=1
- Description for the changelog
Completes the TLS support for ingress node firewall operator.
Summary by CodeRabbit
New Features
Improvements
Documentation & Tests