Enabling collector to mount multiple configMaps

.chloggen/add-more-configmaps.yaml

@@ -0,0 +1,16 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: 'enhancement'
+
+# The name of the component, or a single word describing the area of concern, (e.g. operator, target allocator, github action)
+component: operator
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Allow the collector CRD to specify a list of configmaps to mount
+
+# One or more tracking issues related to the change
+issues: [1819]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

apis/v1alpha1/opentelemetrycollector_types.go

@@ -264,6 +264,11 @@ type OpenTelemetryCollectorSpec struct {
 	// This is only relevant to statefulset, and deployment mode
 	// +optional
 	TopologySpreadConstraints []v1.TopologySpreadConstraint `json:"topologySpreadConstraints,omitempty"`
+
+	// ConfigMaps is a list of ConfigMaps in the same namespace as the OpenTelemetryCollector
+	// object, which shall be mounted into the Collector Pods.
+	// Each ConfigMap will be added to the Collector's Deployments as a volume named `configmap-<configmap-name>`.
+	ConfigMaps []ConfigMapsSpec `json:"configmaps,omitempty"`
 }
 
 // OpenTelemetryTargetAllocator defines the configurations for the Prometheus target allocator.
@@ -506,6 +511,12 @@ type MetricSpec struct {
 	Pods *autoscalingv2.PodsMetricSource `json:"pods,omitempty"`
 }
 
+type ConfigMapsSpec struct {
+	// Configmap defines name and path where the configMaps should be mounted.
+	Name      string `json:"name,omitempty"`
+	MountPath string `json:"mountpath,omitempty"`
+}
+
 func init() {
 	SchemeBuilder.Register(&OpenTelemetryCollector{}, &OpenTelemetryCollectorList{})
 }

bundle/manifests/opentelemetry-operator.clusterserviceversion.yaml

@@ -31,7 +31,7 @@ metadata:
     categories: Logging & Tracing,Monitoring
     certified: "false"
     containerImage: ghcr.io/open-telemetry/opentelemetry-operator/opentelemetry-operator
-    createdAt: "2023-08-28T17:54:06Z"
+    createdAt: "2023-09-07T15:34:24Z"
     description: Provides the OpenTelemetry components, including the Collector
     operators.operatorframework.io/builder: operator-sdk-v1.29.0
     operators.operatorframework.io/project_layout: go.kubebuilder.io/v3

bundle/manifests/opentelemetry.io_opentelemetrycollectors.yaml

@@ -2120,6 +2120,20 @@ spec:
                   configuration. Refer to the OpenTelemetry Collector documentation
                   for details.
                 type: string
+              configmaps:
+                description: ConfigMaps is a list of ConfigMaps in the same namespace
+                  as the OpenTelemetryCollector object, which shall be mounted into
+                  the Collector Pods.
+                items:
+                  properties:
+                    mountpath:
+                      type: string
+                    name:
+                      description: Configmap defines name and path where the configMaps
+                        should be mounted.
+                      type: string
+                  type: object
+                type: array
               env:
                 description: ENV vars to set on the OpenTelemetry Collector's Pods.
                   These can then in certain cases be consumed in the config file for

config/crd/bases/opentelemetry.io_opentelemetrycollectors.yaml

@@ -2117,6 +2117,20 @@ spec:
                   configuration. Refer to the OpenTelemetry Collector documentation
                   for details.
                 type: string
+              configmaps:
+                description: ConfigMaps is a list of ConfigMaps in the same namespace
+                  as the OpenTelemetryCollector object, which shall be mounted into
+                  the Collector Pods.
+                items:
+                  properties:
+                    mountpath:
+                      type: string
+                    name:
+                      description: Configmap defines name and path where the configMaps
+                        should be mounted.
+                      type: string
+                  type: object
+                type: array
               env:
                 description: ENV vars to set on the OpenTelemetry Collector's Pods.
                   These can then in certain cases be consumed in the config file for

docs/api.md

@@ -3688,6 +3688,13 @@ OpenTelemetryCollectorSpec defines the desired state of OpenTelemetryCollector.
           Config is the raw JSON to be used as the collector's configuration. Refer to the OpenTelemetry Collector documentation for details.<br/>
         </td>
         <td>false</td>
+      </tr><tr>
+        <td><b><a href="#opentelemetrycollectorspecconfigmapsindex">configmaps</a></b></td>
+        <td>[]object</td>
+        <td>
+          ConfigMaps is a list of ConfigMaps in the same namespace as the OpenTelemetryCollector object, which shall be mounted into the Collector Pods.<br/>
+        </td>
+        <td>false</td>
       </tr><tr>
         <td><b><a href="#opentelemetrycollectorspecenvindex">env</a></b></td>
         <td>[]object</td>
@@ -8082,6 +8089,40 @@ target specifies the target value for the given metric
 </table>
 
 
+### OpenTelemetryCollector.spec.configmaps[index]
+<sup><sup>[↩ Parent](#opentelemetrycollectorspec)</sup></sup>
+
+
+
+
+
+<table>
+    <thead>
+        <tr>
+            <th>Name</th>
+            <th>Type</th>
+            <th>Description</th>
+            <th>Required</th>
+        </tr>
+    </thead>
+    <tbody><tr>
+        <td><b>mountpath</b></td>
+        <td>string</td>
+        <td>
+          <br/>
+        </td>
+        <td>false</td>
+      </tr><tr>
+        <td><b>name</b></td>
+        <td>string</td>
+        <td>
+          Configmap defines name and path where the configMaps should be mounted.<br/>
+        </td>
+        <td>false</td>
+      </tr></tbody>
+</table>
+
+
 ### OpenTelemetryCollector.spec.env[index]
 <sup><sup>[↩ Parent](#opentelemetrycollectorspec)</sup></sup>
 

internal/manifests/collector/container.go

@@ -104,6 +104,14 @@ func Container(cfg config.Config, logger logr.Logger, otelcol v1alpha1.OpenTelem
 		},
 	})
 
+	if len(otelcol.Spec.ConfigMaps) > 0 {
+		for keyCfgMap := range otelcol.Spec.ConfigMaps {
+			volumeMounts = append(volumeMounts, corev1.VolumeMount{
+				MountPath: otelcol.Spec.ConfigMaps[keyCfgMap].MountPath + "/" + otelcol.Spec.ConfigMaps[keyCfgMap].Name,
+			})
+		}
+	}
+
 	if otelcol.Spec.TargetAllocator.Enabled {
 		// We need to add a SHARD here so the collector is able to keep targets after the hashmod operation which is
 		// added by default by the Prometheus operator's config generator.

internal/manifests/collector/container_test.go

@@ -318,6 +318,30 @@ func TestContainerCustomVolumes(t *testing.T) {
 	assert.Equal(t, "custom-volume-mount", c.VolumeMounts[1].Name)
 }
 
+func TestContainerCustomConfigMapsVolumes(t *testing.T) {
+	// prepare
+	otelcol := v1alpha1.OpenTelemetryCollector{
+		Spec: v1alpha1.OpenTelemetryCollectorSpec{
+			ConfigMaps: []v1alpha1.ConfigMapsSpec{{
+				Name:      "configmap-test",
+				MountPath: "/var/conf",
+			}, {
+				Name:      "configmap-test2",
+				MountPath: "/var/conf/dir",
+			}},
+		},
+	}
+	cfg := config.New()
+
+	// test
+	c := Container(cfg, logger, otelcol, true)
+
+	// verify
+	assert.Len(t, c.VolumeMounts, 3)
+	assert.Equal(t, "/var/conf/configmap-test", c.VolumeMounts[1].MountPath)
+	assert.Equal(t, "/var/conf/dir/configmap-test2", c.VolumeMounts[2].MountPath)
+}
+
 func TestContainerCustomSecurityContext(t *testing.T) {
 	// default config without security context
 	c1 := Container(config.New(), logger, v1alpha1.OpenTelemetryCollector{Spec: v1alpha1.OpenTelemetryCollectorSpec{}}, true)

internal/manifests/collector/volume.go

@@ -42,5 +42,20 @@ func Volumes(cfg config.Config, otelcol v1alpha1.OpenTelemetryCollector) []corev
 		volumes = append(volumes, otelcol.Spec.Volumes...)
 	}
 
+	if len(otelcol.Spec.ConfigMaps) > 0 {
+		for keyCfgMap := range otelcol.Spec.ConfigMaps {
+			volumes = append(volumes, corev1.Volume{
+				Name: "configmap_" + otelcol.Spec.ConfigMaps[keyCfgMap].Name,
+				VolumeSource: corev1.VolumeSource{
+					ConfigMap: &corev1.ConfigMapVolumeSource{
+						LocalObjectReference: corev1.LocalObjectReference{
+							Name: otelcol.Spec.ConfigMaps[keyCfgMap].Name,
+						},
+					},
+				},
+			})
+		}
+	}
+
 	return volumes
 }

internal/manifests/collector/volume_test.go

@@ -61,3 +61,29 @@ func TestVolumeAllowsMoreToBeAdded(t *testing.T) {
 	// check that it's the otc-internal volume, with the config map
 	assert.Equal(t, "my-volume", volumes[1].Name)
 }
+
+func TestVolumeWithMoreConfigMaps(t *testing.T) {
+	// prepare
+	otelcol := v1alpha1.OpenTelemetryCollector{
+		Spec: v1alpha1.OpenTelemetryCollectorSpec{
+			ConfigMaps: []v1alpha1.ConfigMapsSpec{{
+				Name:      "configmap-test",
+				MountPath: "/var/conf",
+			}, {
+				Name:      "configmap-test2",
+				MountPath: "/var/conf",
+			}},
+		},
+	}
+	cfg := config.New()
+
+	// test
+	volumes := Volumes(cfg, otelcol)
+
+	// verify
+	assert.Len(t, volumes, 3)
+
+	// check if the volume with the configmap prefix is mounted after defining the config map.
+	assert.Equal(t, "configmap_configmap-test", volumes[1].Name)
+	assert.Equal(t, "configmap_configmap-test2", volumes[2].Name)
+}