agent,config,helm: make agent runtime configurable.

Add configuration for the agent itself. Currently the only control enables access to Node Resource Topology Custom Resources and it is on by default. Update the agent to honor its configuration. Signed-off-by: Krisztian Litkey <[email protected]>
containers · Dec 1, 2024 · afc1046 · afc1046
1 parent ef4c84f
commit afc1046
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Showing 14 changed files with 234 additions and 23 deletions.
diff --git a/config/crd/bases/config.nri_balloonspolicies.yaml b/config/crd/bases/config.nri_balloonspolicies.yaml
@@ -40,6 +40,18 @@ spec:
           spec:
             description: BalloonsPolicySpec describes a balloons policy.
             properties:
+              agent:
+                default:
+                  nodeResourceTopology: true
+                description: AgentConfig provides access to configuration data for
+                  the agent.
+                properties:
+                  nodeResourceTopology:
+                    description: |-
+                      NodeResourceTopology enables support for exporting resource usage using
+                      NodeResourceTopology Custom Resources.
+                    type: boolean
+                type: object
               allocatorTopologyBalancing:
                 description: |-
                   If AllocatorTopologyBalancing is true, balloons are

diff --git a/config/crd/bases/config.nri_templatepolicies.yaml b/config/crd/bases/config.nri_templatepolicies.yaml
@@ -40,6 +40,18 @@ spec:
           spec:
             description: TemplatePolicySpec describes a template policy.
             properties:
+              agent:
+                default:
+                  nodeResourceTopology: true
+                description: AgentConfig provides access to configuration data for
+                  the agent.
+                properties:
+                  nodeResourceTopology:
+                    description: |-
+                      NodeResourceTopology enables support for exporting resource usage using
+                      NodeResourceTopology Custom Resources.
+                    type: boolean
+                type: object
               availableResources:
                 additionalProperties:
                   type: string

diff --git a/config/crd/bases/config.nri_topologyawarepolicies.yaml b/config/crd/bases/config.nri_topologyawarepolicies.yaml
@@ -40,6 +40,18 @@ spec:
           spec:
             description: TopologyAwarePolicySpec describes a topology-aware policy.
             properties:
+              agent:
+                default:
+                  nodeResourceTopology: true
+                description: AgentConfig provides access to configuration data for
+                  the agent.
+                properties:
+                  nodeResourceTopology:
+                    description: |-
+                      NodeResourceTopology enables support for exporting resource usage using
+                      NodeResourceTopology Custom Resources.
+                    type: boolean
+                type: object
               availableResources:
                 additionalProperties:
                   type: string

diff --git a/deployment/helm/balloons/crds/config.nri_balloonspolicies.yaml b/deployment/helm/balloons/crds/config.nri_balloonspolicies.yaml
@@ -40,6 +40,18 @@ spec:
           spec:
             description: BalloonsPolicySpec describes a balloons policy.
             properties:
+              agent:
+                default:
+                  nodeResourceTopology: true
+                description: AgentConfig provides access to configuration data for
+                  the agent.
+                properties:
+                  nodeResourceTopology:
+                    description: |-
+                      NodeResourceTopology enables support for exporting resource usage using
+                      NodeResourceTopology Custom Resources.
+                    type: boolean
+                type: object
               allocatorTopologyBalancing:
                 description: |-
                   If AllocatorTopologyBalancing is true, balloons are

diff --git a/deployment/helm/template/crds/config.nri_templatepolicies.yaml b/deployment/helm/template/crds/config.nri_templatepolicies.yaml
@@ -40,6 +40,18 @@ spec:
           spec:
             description: TemplatePolicySpec describes a template policy.
             properties:
+              agent:
+                default:
+                  nodeResourceTopology: true
+                description: AgentConfig provides access to configuration data for
+                  the agent.
+                properties:
+                  nodeResourceTopology:
+                    description: |-
+                      NodeResourceTopology enables support for exporting resource usage using
+                      NodeResourceTopology Custom Resources.
+                    type: boolean
+                type: object
               availableResources:
                 additionalProperties:
                   type: string

diff --git a/deployment/helm/topology-aware/crds/config.nri_topologyawarepolicies.yaml b/deployment/helm/topology-aware/crds/config.nri_topologyawarepolicies.yaml
@@ -40,6 +40,18 @@ spec:
           spec:
             description: TopologyAwarePolicySpec describes a topology-aware policy.
             properties:
+              agent:
+                default:
+                  nodeResourceTopology: true
+                description: AgentConfig provides access to configuration data for
+                  the agent.
+                properties:
+                  nodeResourceTopology:
+                    description: |-
+                      NodeResourceTopology enables support for exporting resource usage using
+                      NodeResourceTopology Custom Resources.
+                    type: boolean
+                type: object
               availableResources:
                 additionalProperties:
                   type: string

diff --git a/pkg/agent/agent.go b/pkg/agent/agent.go
@@ -262,42 +262,88 @@ func (a *Agent) Stop() {
 	}
 }
 
-func (a *Agent) hasLocalConfig() bool {
-	return a.configFile != ""
+var (
+	defaultConfig = &cfgapi.AgentConfig{
+		PodResourceAPI:       false,
+		NodeResourceTopology: true,
+	}
+)
+
+func getAgentConfig(newConfig metav1.Object) *cfgapi.AgentConfig {
+	cfg := cfgapi.GetAgentConfig(newConfig)
+	if cfg == nil {
+		return defaultConfig
+	}
+	return cfg
 }
 
-func (a *Agent) setupClients() error {
+func (a *Agent) configure(newConfig metav1.Object) error {
 	if a.hasLocalConfig() {
+		log.Warn("running with local configuration, skipping cluster access client setup...")
 		return nil
 	}
 
-	cfg, err := a.getRESTConfig()
-	if err != nil {
-		return err
-	}
+	cfg := getAgentConfig(newConfig)
 
-	a.httpCli, err = rest.HTTPClientFor(cfg)
-	if err != nil {
-		return fmt.Errorf("failed to setup kubernetes HTTP client: %w", err)
+	// We always need a HTTP/REST client and a K8s client.
+	if a.httpCli == nil {
+		log.Info("setting up HTTP/REST client...")
+		restCfg, err := a.getRESTConfig()
+		if err != nil {
+			return err
+		}
+
+		a.httpCli, err = rest.HTTPClientFor(restCfg)
+		if err != nil {
+			return fmt.Errorf("failed to setup kubernetes HTTP client: %w", err)
+		}
+
+		log.Info("setting up K8s client...")
+		a.k8sCli, err = k8sclient.NewForConfigAndClient(restCfg, a.httpCli)
+		if err != nil {
+			a.cleanupClients()
+			return fmt.Errorf("failed to setup kubernetes client: %w", err)
+		}
+
+		kubeCfg := *restCfg
+		err = a.cfgIf.SetKubeClient(a.httpCli, &kubeCfg)
+		if err != nil {
+			return fmt.Errorf("failed to setup kubernetes config resource client: %w", err)
+		}
 	}
 
-	a.k8sCli, err = k8sclient.NewForConfigAndClient(cfg, a.httpCli)
-	if err != nil {
-		a.cleanupClients()
-		return fmt.Errorf("failed to setup kubernetes client: %w", err)
+	switch {
+	case cfg.NodeResourceTopology && a.nrtCli == nil:
+		log.Info("enabling NRT client")
+		cfg, err := a.getRESTConfig()
+		if err != nil {
+			return err
+		}
+		cli, err := nrtapi.NewForConfigAndClient(cfg, a.httpCli)
+		if err != nil {
+			return fmt.Errorf("failed to setup NRT client: %w", err)
+		}
+		a.nrtCli = cli
+
+	case !cfg.NodeResourceTopology && a.nrtCli != nil:
+		log.Info("disabling NRT client")
+		a.nrtCli = nil
 	}
 
-	restCfg := *cfg
-	a.nrtCli, err = nrtapi.NewForConfigAndClient(&restCfg, a.httpCli)
-	if err != nil {
-		a.cleanupClients()
-		return fmt.Errorf("failed to setup NRT client: %w", err)
+	return nil
+}
+
+func (a *Agent) hasLocalConfig() bool {
+	return a.configFile != ""
+}
+
+func (a *Agent) setupClients() error {
+	if a.hasLocalConfig() {
+		return nil
 	}
 
-	restCfg = *cfg
-	err = a.cfgIf.SetKubeClient(a.httpCli, &restCfg)
-	if err != nil {
-		return fmt.Errorf("failed to setup kubernetes config resource client: %w", err)
+	if err := a.configure(a.currentCfg); err != nil {
+		return fmt.Errorf("failed set up clients: %w", err)
 	}
 
 	return nil
@@ -556,6 +602,10 @@ func (a *Agent) updateConfig(cfg metav1.Object) {
 	}
 
 	a.currentCfg = cfg
+
+	if err := a.configure(cfg); err != nil {
+		log.Warn("failed to reconfigure agent: %v", err)
+	}
 }
 
 func (a *Agent) patchConfigStatus(prev, curr metav1.Object, errors error) {

diff --git a/pkg/apis/config/v1alpha1/agent.go b/pkg/apis/config/v1alpha1/agent.go
@@ -0,0 +1,31 @@
+// Copyright The NRI Plugins Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package v1alpha1
+
+// AgentConfig provides access to configuration data for the agent.
+type AgentConfig struct {
+	// NodeResourceTopology enables support for exporting resource usage using
+	// NodeResourceTopology Custom Resources.
+	// +optional
+	NodeResourceTopology bool `json:"nodeResourceTopology,omitempty"`
+}
+
+// GetAgentConfig returns the agent-specific configuration if we have one.
+func GetAgentConfig(cfg interface{}) *AgentConfig {
+	if ac, ok := cfg.(interface{ AgentConfig() *AgentConfig }); ok {
+		return ac.AgentConfig()
+	}
+	return nil
+}
diff --git a/pkg/apis/config/v1alpha1/balloons-policy.go b/pkg/apis/config/v1alpha1/balloons-policy.go
@@ -18,6 +18,16 @@ var (
 	_ ResmgrConfig = &BalloonsPolicy{}
 )
 
+func (c *BalloonsPolicy) AgentConfig() *AgentConfig {
+	if c == nil {
+		return nil
+	}
+
+	a := c.Spec.Agent
+
+	return &a
+}
+
 func (c *BalloonsPolicy) CommonConfig() *CommonConfig {
 	if c == nil {
 		return nil

diff --git a/pkg/apis/config/v1alpha1/resmgr.go b/pkg/apis/config/v1alpha1/resmgr.go
@@ -29,6 +29,7 @@ import (
 // +kubebuilder:object:generate=false
 type ResmgrConfig interface {
 	metav1.ObjectMetaAccessor
+	AgentConfig() *AgentConfig
 	CommonConfig() *CommonConfig
 	PolicyConfig() interface{}
 }

diff --git a/pkg/apis/config/v1alpha1/template-policy.go b/pkg/apis/config/v1alpha1/template-policy.go
@@ -18,6 +18,16 @@ var (
 	_ ResmgrConfig = &TemplatePolicy{}
 )
 
+func (c *TemplatePolicy) AgentConfig() *AgentConfig {
+	if c == nil {
+		return nil
+	}
+
+	a := c.Spec.Agent
+
+	return &a
+}
+
 func (c *TemplatePolicy) CommonConfig() *CommonConfig {
 	if c == nil {
 		return nil

diff --git a/pkg/apis/config/v1alpha1/topology-aware-policy.go b/pkg/apis/config/v1alpha1/topology-aware-policy.go
@@ -18,6 +18,16 @@ var (
 	_ ResmgrConfig = &TopologyAwarePolicy{}
 )
 
+func (c *TopologyAwarePolicy) AgentConfig() *AgentConfig {
+	if c == nil {
+		return nil
+	}
+
+	a := c.Spec.Agent
+
+	return &a
+}
+
 func (c *TopologyAwarePolicy) CommonConfig() *CommonConfig {
 	if c == nil {
 		return nil

diff --git a/pkg/apis/config/v1alpha1/types.go b/pkg/apis/config/v1alpha1/types.go
@@ -46,6 +46,9 @@ type TopologyAwarePolicySpec struct {
 	Log log.Config `json:"log,omitempty"`
 	// +optional
 	Instrumentation instrumentation.Config `json:"instrumentation,omitempty"`
+	// +optional
+	// +kubebuilder:default={"nodeResourceTopology": true }
+	Agent AgentConfig `json:"agent,omitempty"`
 }
 
 // TopologyAwarePolicyList represents a list of TopologyAwarePolicies.
@@ -78,6 +81,9 @@ type BalloonsPolicySpec struct {
 	Log log.Config `json:"log,omitempty"`
 	// +optional
 	Instrumentation instrumentation.Config `json:"instrumentation,omitempty"`
+	// +optional
+	// +kubebuilder:default={"nodeResourceTopology": true }
+	Agent AgentConfig `json:"agent,omitempty"`
 }
 
 // BalloonsPolicyList represents a list of BalloonsPolicies.
@@ -110,6 +116,9 @@ type TemplatePolicySpec struct {
 	Log log.Config `json:"log,omitempty"`
 	// +optional
 	Instrumentation instrumentation.Config `json:"instrumentation,omitempty"`
+	// +optional
+	// +kubebuilder:default={"nodeResourceTopology": true }
+	Agent AgentConfig `json:"agent,omitempty"`
 }
 
 // TemplatePolicyList represents a list of TemplatePolicies.