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✨ Add per-agent bind configuration to AgentConfiguration - #467
agentConfiguration.bindConfiguration from #462 has one health probe port for all klusterlet agents. That works in Singleton mode, where there is only one agent pod. In Default mode, the registration and work agents are two separate pods. With hostNetwork: true they share the node's ports, so when both land on the same node the second one fails with bind: address already in use on the same healthProbePort. I reproduced this on kind while wiring #462 into ocm#1688.
This PR adds a separate bind configuration for each agent, following the ClusterManager pattern:
ClusterManager doesn't have this problem because each webhook server has its own bind configuration, so users can give each one its own ports when they use host networking:
API: DefaultClusterManagerConfiguration has registrationWebhookConfiguration, workWebhookConfiguration and addonWebhookConfiguration, and each wraps its own BindConfiguration with healthProbePort, metricsPort and hostNetwork:
AgentConfiguration gets two optional fields, registrationAgentConfiguration and workAgentConfiguration. Each one wraps an AgentBindConfiguration, the same type ✨ Add AgentConfiguration to KlusterletSpec #462 added, so defaults and validation are the same (healthProbePort defaults to 8443, range 1024-65535).
The per-agent fields are ignored in Singleton mode.
I didn't add a CEL rule to reject the same port on both agents. Whether they clash depends on scheduling (they only clash on the same node), and ClusterManager doesn't validate this either. The field docs say to use different ports when both agents use hostNetwork.
Testing
make update: only the expected files change (types, deepcopy, model names, CRD)
make verify: passes
make test-integration: passes, including new specs for per-agent ports with hostNetwork, defaulting of a per-agent healthProbePort, and rejecting a privileged port in a per-agent configuration
AI assistance: this change and the commit message were prepared with help from Claude Code, and reviewed and tested by me.
Summary by CodeRabbit
New Features
Added separate bind settings for registration and work agents in Default mode, including health-probe, host-network, and metrics options.
Shared bind settings continue to apply to the Singleton-mode agent and serve as defaults for Default-mode agents without their own settings. Per-agent settings are ignored in Singleton mode.
When both agents use host networking on the same node, configure distinct health-probe ports to avoid conflicts.
In Default mode the registration and work agents run as separate pods.
With hostNetwork enabled they share the node's ports, so a single
agentConfiguration.bindConfiguration makes both bind the same
healthProbePort and the second one fails with "address already in use"
when they land on the same node.
Add optional registrationAgentConfiguration and workAgentConfiguration,
each with its own bindConfiguration, following the per-webhook
bindConfiguration in DefaultClusterManagerConfiguration. The existing
bindConfiguration still applies to the klusterlet-agent in Singleton
mode and to any Default mode agent that does not set its own.
Refs: open-cluster-management-io/ocm#1688
Signed-off-by: Payal Jain <payal.36garh@gmail.com>
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Inline comments:
Review comments at @operator/v1/types_klusterlet.go:
- Around line 133-134: Update the agent field documentation near the
healthProbePort guidance to also tell users to configure distinct metricsPort
values when agents use hostNetwork on the same node, and note that a metricsPort
value less than or equal to zero disables metrics for that agent.
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Walkthrough
The klusterlet API adds separate bind configurations for registration and work agents in Default mode. Shared bind settings remain applicable in Singleton mode and as a fallback in Default mode. Generated copy methods and integration tests cover the new configuration.
The API type and CRD define separate registration-agent and work-agent settings for Default mode. Each supports health-probe and metrics ports and host networking. The CRD specifies defaults and port limits.
Copy and validate agent settings operator/v1/zz_generated.deepcopy.go, operator/v1/zz_generated.model_name.go, test/integration/api/klusterlet_test.go
Generated methods deep-copy the new configuration and expose its OpenAPI model name. Integration tests check separate settings, the default health-probe port, and rejection of health-probe port 80.
Operators placing both host-network agents on one node may overlook the shared metrics-port default. Clarify the guidance before merging, or accept this bounded documentation risk.
Pre-merge checks: 5
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Title check
The title clearly and concisely describes the addition of per-agent bind configuration and uses the repository’s required feature prefix.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @operator/v1/types_klusterlet.go:
- Around line 133-134: Update the agent field documentation near the
healthProbePort guidance to also tell users to configure distinct metricsPort
values when agents use hostNetwork on the same node, and note that a metricsPort
value less than or equal to zero disables metrics for that agent.
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Document the metrics-port default alongside the health-probe guidance.
The field documentation tells users to set different healthProbePort values when both agents use hostNetwork on the same node. Both per-agent metricsPort fields default to 8080, so the same guidance applies to metrics ports. Omitting both leaves both defaults in effect, and the guidance does not mention them.
📝 Suggested documentation update
--- "a/operator/v1/types_klusterlet.go"+++ "b/operator/v1/types_klusterlet.go"@@ -130,8 +130,9 @@
type AgentComponentConfiguration struct {
// BindConfiguration represents the server bind configuration of the agent.
// In Default mode the registration and work agents run as separate pods. When both
// use hostNetwork and can be scheduled on the same node, set a different
- // healthProbePort for each of them.+ // healthProbePort and metricsPort for each of them. To disable metrics for+ // one agent, set its metricsPort to a value less than or equal to zero.
// +optional
BindConfiguration *AgentBindConfiguration `json:"bindConfiguration,omitempty"`
}
Regenerate the CRD with make update after changing the type documentation. Do not edit the generated CRD by hand.
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Suggested change
// use hostNetwork and can be scheduled on the same node, set a different
// healthProbePort for each of them.
// use hostNetwork and can be scheduled on the same node, set a different
// healthProbePort and metricsPort for each of them. To disable metrics for
// one agent, set its metricsPort to a value less than or equal to zero.
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Review comment at @operator/v1/types_klusterlet.go around lines 133 - 134:
Update the agent field documentation near the healthProbePort guidance to also
tell users to configure distinct metricsPort values when agents use hostNetwork
on the same node, and note that a metricsPort value less than or equal to zero
disables metrics for that agent.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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Summary
Follow-up to #462, as discussed in open-cluster-management-io/ocm#1688.
agentConfiguration.bindConfigurationfrom #462 has one health probe port for all klusterlet agents. That works in Singleton mode, where there is only one agent pod. In Default mode, the registration and work agents are two separate pods. WithhostNetwork: truethey share the node's ports, so when both land on the same node the second one fails withbind: address already in useon the samehealthProbePort. I reproduced this on kind while wiring #462 into ocm#1688.This PR adds a separate bind configuration for each agent, following the ClusterManager pattern:
How ClusterManager handles this
ClusterManager doesn't have this problem because each webhook server has its own bind configuration, so users can give each one its own ports when they use host networking:
DefaultClusterManagerConfigurationhasregistrationWebhookConfiguration,workWebhookConfigurationandaddonWebhookConfiguration, and each wraps its ownBindConfigurationwithhealthProbePort,metricsPortandhostNetwork:api/operator/v1/types_clustermanager.go
Lines 437 to 496 in 15b0179
https://github.com/open-cluster-management-io/ocm/blob/cfe717c8629f89e7be56be9e926ef294a98f163d/pkg/operator/operators/clustermanager/controllers/clustermanagercontroller/clustermanager_controller.go#L470-L474
https://github.com/open-cluster-management-io/ocm/blob/cfe717c8629f89e7be56be9e926ef294a98f163d/pkg/operator/operators/clustermanager/controllers/clustermanagercontroller/clustermanager_controller.go#L518-L533
Changes
AgentConfigurationgets two optional fields,registrationAgentConfigurationandworkAgentConfiguration. Each one wraps anAgentBindConfiguration, the same type ✨ Add AgentConfiguration to KlusterletSpec #462 added, so defaults and validation are the same (healthProbePortdefaults to 8443, range 1024-65535).bindConfigurationkeeps working as before. It applies to the klusterlet-agent in Singleton mode, and in Default mode it is used by any agent that doesn't set its ownbindConfiguration. Nothing from ✨ Add AgentConfiguration to KlusterletSpec #462 is removed or renamed, and ✨ Add AgentConfiguration to KlusterletSpec #462 isn't in a release yet.I didn't add a CEL rule to reject the same port on both agents. Whether they clash depends on scheduling (they only clash on the same node), and ClusterManager doesn't validate this either. The field docs say to use different ports when both agents use
hostNetwork.Testing
make update: only the expected files change (types, deepcopy, model names, CRD)make verify: passesmake test-integration: passes, including new specs for per-agent ports withhostNetwork, defaulting of a per-agenthealthProbePort, and rejecting a privileged port in a per-agent configurationRelated issue(s)
Ref: open-cluster-management-io/ocm#1688, open-cluster-management-io/ocm#1032, #439
AI assistance: this change and the commit message were prepared with help from Claude Code, and reviewed and tested by me.
Summary by CodeRabbit