Python auto-instrumentation: handle musl based containers

.chloggen/3332-musl-python-autoinstrumentation.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. collector, target allocator, auto-instrumentation, opamp, github action)
+component: auto-instrumentation
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: add config for installing musl based auto-instrumentation for Python
+
+# One or more tracking issues related to the change
+issues: [2264]
+
+# (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:

README.md

@@ -292,9 +292,12 @@ instrumentation.opentelemetry.io/inject-nodejs: "true"
 ```
 
 Python:
+Python auto-instrumentation also honors an annotation that will permit it to run it on images with a different C library than glibc.
 
 ```bash
 instrumentation.opentelemetry.io/inject-python: "true"
+instrumentation.opentelemetry.io/otel-python-platform: "glibc" # for Linux glibc based images, this is the default value and can be omitted
+instrumentation.opentelemetry.io/otel-python-platform: "musl" # for Linux musl based images
 ```
 
 .NET:

pkg/instrumentation/annotation.go

@@ -30,6 +30,7 @@ const (
 	annotationInjectNodeJSContainersName      = "instrumentation.opentelemetry.io/nodejs-container-names"
 	annotationInjectPython                    = "instrumentation.opentelemetry.io/inject-python"
 	annotationInjectPythonContainersName      = "instrumentation.opentelemetry.io/python-container-names"
+	annotationPythonPlatform                  = "instrumentation.opentelemetry.io/otel-python-platform"
 	annotationInjectDotNet                    = "instrumentation.opentelemetry.io/inject-dotnet"
 	annotationDotNetRuntime                   = "instrumentation.opentelemetry.io/otel-dotnet-auto-runtime"
 	annotationInjectDotnetContainersName      = "instrumentation.opentelemetry.io/dotnet-container-names"

pkg/instrumentation/podmutator.go

@@ -321,6 +321,7 @@ func (pm *instPodMutator) Mutate(ctx context.Context, ns corev1.Namespace, pod c
 	}
 	if pm.config.EnablePythonAutoInstrumentation() || inst == nil {
 		insts.Python.Instrumentation = inst
+		insts.Python.AdditionalAnnotations = map[string]string{annotationPythonPlatform: annotationValue(ns.ObjectMeta, pod.ObjectMeta, annotationPythonPlatform)}
 	} else {
 		logger.Error(nil, "support for Python auto instrumentation is not enabled")
 		pm.Recorder.Event(pod.DeepCopy(), "Warning", "InstrumentationRequestRejected", "support for Python auto instrumentation is not enabled")

pkg/instrumentation/python.go

@@ -23,19 +23,23 @@ import (
 )
 
 const (
-	envPythonPath               = "PYTHONPATH"
-	envOtelTracesExporter       = "OTEL_TRACES_EXPORTER"
-	envOtelMetricsExporter      = "OTEL_METRICS_EXPORTER"
-	envOtelLogsExporter         = "OTEL_LOGS_EXPORTER"
-	envOtelExporterOTLPProtocol = "OTEL_EXPORTER_OTLP_PROTOCOL"
-	pythonPathPrefix            = "/otel-auto-instrumentation-python/opentelemetry/instrumentation/auto_instrumentation"
-	pythonPathSuffix            = "/otel-auto-instrumentation-python"
-	pythonInstrMountPath        = "/otel-auto-instrumentation-python"
-	pythonVolumeName            = volumeName + "-python"
-	pythonInitContainerName     = initContainerName + "-python"
+	envPythonPath                    = "PYTHONPATH"
+	envOtelTracesExporter            = "OTEL_TRACES_EXPORTER"
+	envOtelMetricsExporter           = "OTEL_METRICS_EXPORTER"
+	envOtelLogsExporter              = "OTEL_LOGS_EXPORTER"
+	envOtelExporterOTLPProtocol      = "OTEL_EXPORTER_OTLP_PROTOCOL"
+	glibcLinuxAutoInstrumentationSrc = "/autoinstrumentation/."
+	muslLinuxAutoInstrumentationSrc  = "/autoinstrumentation-musl/."
+	pythonPathPrefix                 = "/otel-auto-instrumentation-python/opentelemetry/instrumentation/auto_instrumentation"
+	pythonPathSuffix                 = "/otel-auto-instrumentation-python"
+	pythonInstrMountPath             = "/otel-auto-instrumentation-python"
+	pythonVolumeName                 = volumeName + "-python"
+	pythonInitContainerName          = initContainerName + "-python"
+	glibcLinux                       = "glibc"
+	muslLinux                        = "musl"
 )
 
-func injectPythonSDK(pythonSpec v1alpha1.Python, pod corev1.Pod, index int) (corev1.Pod, error) {
+func injectPythonSDK(pythonSpec v1alpha1.Python, pod corev1.Pod, index int, platform string) (corev1.Pod, error) {
 	volume := instrVolume(pythonSpec.VolumeClaimTemplate, pythonVolumeName, pythonSpec.VolumeSizeLimit)
 
 	// caller checks if there is at least one container.
@@ -46,6 +50,16 @@ func injectPythonSDK(pythonSpec v1alpha1.Python, pod corev1.Pod, index int) (cor
 		return pod, err
 	}
 
+	autoInstrumentationSrc := ""
+	switch platform {
+	case "", glibcLinux:
+		autoInstrumentationSrc = glibcLinuxAutoInstrumentationSrc
+	case muslLinux:
+		autoInstrumentationSrc = muslLinuxAutoInstrumentationSrc
+	default:
+		return pod, fmt.Errorf("provided instrumentation.opentelemetry.io/otel-python-platform annotation value '%s' is not supported", platform)
+	}
+
 	// inject Python instrumentation spec env vars.
 	for _, env := range pythonSpec.Env {
 		idx := getIndexOfEnv(container.Env, env.Name)
@@ -111,7 +125,7 @@ func injectPythonSDK(pythonSpec v1alpha1.Python, pod corev1.Pod, index int) (cor
 		pod.Spec.InitContainers = append(pod.Spec.InitContainers, corev1.Container{
 			Name:      pythonInitContainerName,
 			Image:     pythonSpec.Image,
-			Command:   []string{"cp", "-r", "/autoinstrumentation/.", pythonInstrMountPath},
+			Command:   []string{"cp", "-r", autoInstrumentationSrc, pythonInstrMountPath},
 			Resources: pythonSpec.Resources,
 			VolumeMounts: []corev1.VolumeMount{{
 				Name:      volume.Name,

pkg/instrumentation/python_test.go

@@ -29,6 +29,7 @@ func TestInjectPythonSDK(t *testing.T) {
 		name string
 		v1alpha1.Python
 		pod      corev1.Pod
+		platform string
 		expected corev1.Pod
 		err      error
 	}{
@@ -42,6 +43,7 @@ func TestInjectPythonSDK(t *testing.T) {
 					},
 				},
 			},
+			platform: "glibc",
 			expected: corev1.Pod{
 				Spec: corev1.PodSpec{
 					Volumes: []corev1.Volume{
@@ -118,6 +120,7 @@ func TestInjectPythonSDK(t *testing.T) {
 					},
 				},
 			},
+			platform: "glibc",
 			expected: corev1.Pod{
 				Spec: corev1.PodSpec{
 					Volumes: []corev1.Volume{
@@ -195,6 +198,7 @@ func TestInjectPythonSDK(t *testing.T) {
 					},
 				},
 			},
+			platform: "glibc",
 			expected: corev1.Pod{
 				Spec: corev1.PodSpec{
 					Volumes: []corev1.Volume{
@@ -271,6 +275,7 @@ func TestInjectPythonSDK(t *testing.T) {
 					},
 				},
 			},
+			platform: "glibc",
 			expected: corev1.Pod{
 				Spec: corev1.PodSpec{
 					Volumes: []corev1.Volume{
@@ -423,6 +428,7 @@ func TestInjectPythonSDK(t *testing.T) {
 					},
 				},
 			},
+			platform: "glibc",
 			expected: corev1.Pod{
 				Spec: corev1.PodSpec{
 					Volumes: []corev1.Volume{
@@ -499,6 +505,7 @@ func TestInjectPythonSDK(t *testing.T) {
 					},
 				},
 			},
+			platform: "glibc",
 			expected: corev1.Pod{
 				Spec: corev1.PodSpec{
 					Containers: []corev1.Container{
@@ -515,11 +522,171 @@ func TestInjectPythonSDK(t *testing.T) {
 			},
 			err: fmt.Errorf("the container defines env var value via ValueFrom, envVar: %s", envPythonPath),
 		},
+		{
+			name:   "musl platform defined",
+			Python: v1alpha1.Python{Image: "foo/bar:1"},
+			pod: corev1.Pod{
+				Spec: corev1.PodSpec{
+					Containers: []corev1.Container{
+						{},
+					},
+				},
+			},
+			platform: "musl",
+			expected: corev1.Pod{
+				Spec: corev1.PodSpec{
+					Volumes: []corev1.Volume{
+						{
+							Name: pythonVolumeName,
+							VolumeSource: corev1.VolumeSource{
+								EmptyDir: &corev1.EmptyDirVolumeSource{
+									SizeLimit: &defaultVolumeLimitSize,
+								},
+							},
+						},
+					},
+					InitContainers: []corev1.Container{
+						{
+							Name:    "opentelemetry-auto-instrumentation-python",
+							Image:   "foo/bar:1",
+							Command: []string{"cp", "-r", "/autoinstrumentation-musl/.", "/otel-auto-instrumentation-python"},
+							VolumeMounts: []corev1.VolumeMount{{
+								Name:      "opentelemetry-auto-instrumentation-python",
+								MountPath: "/otel-auto-instrumentation-python",
+							}},
+						},
+					},
+					Containers: []corev1.Container{
+						{
+							VolumeMounts: []corev1.VolumeMount{
+								{
+									Name:      "opentelemetry-auto-instrumentation-python",
+									MountPath: "/otel-auto-instrumentation-python",
+								},
+							},
+							Env: []corev1.EnvVar{
+								{
+									Name:  "PYTHONPATH",
+									Value: fmt.Sprintf("%s:%s", "/otel-auto-instrumentation-python/opentelemetry/instrumentation/auto_instrumentation", "/otel-auto-instrumentation-python"),
+								},
+								{
+									Name:  "OTEL_EXPORTER_OTLP_PROTOCOL",
+									Value: "http/protobuf",
+								},
+								{
+									Name:  "OTEL_TRACES_EXPORTER",
+									Value: "otlp",
+								},
+								{
+									Name:  "OTEL_METRICS_EXPORTER",
+									Value: "otlp",
+								},
+								{
+									Name:  "OTEL_LOGS_EXPORTER",
+									Value: "otlp",
+								},
+							},
+						},
+					},
+				},
+			},
+			err: nil,
+		},
+		{
+			name:   "platform not defined",
+			Python: v1alpha1.Python{Image: "foo/bar:1"},
+			pod: corev1.Pod{
+				Spec: corev1.PodSpec{
+					Containers: []corev1.Container{
+						{},
+					},
+				},
+			},
+			platform: "",
+			expected: corev1.Pod{
+				Spec: corev1.PodSpec{
+					Volumes: []corev1.Volume{
+						{
+							Name: pythonVolumeName,
+							VolumeSource: corev1.VolumeSource{
+								EmptyDir: &corev1.EmptyDirVolumeSource{
+									SizeLimit: &defaultVolumeLimitSize,
+								},
+							},
+						},
+					},
+					InitContainers: []corev1.Container{
+						{
+							Name:    "opentelemetry-auto-instrumentation-python",
+							Image:   "foo/bar:1",
+							Command: []string{"cp", "-r", "/autoinstrumentation/.", "/otel-auto-instrumentation-python"},
+							VolumeMounts: []corev1.VolumeMount{{
+								Name:      "opentelemetry-auto-instrumentation-python",
+								MountPath: "/otel-auto-instrumentation-python",
+							}},
+						},
+					},
+					Containers: []corev1.Container{
+						{
+							VolumeMounts: []corev1.VolumeMount{
+								{
+									Name:      "opentelemetry-auto-instrumentation-python",
+									MountPath: "/otel-auto-instrumentation-python",
+								},
+							},
+							Env: []corev1.EnvVar{
+								{
+									Name:  "PYTHONPATH",
+									Value: fmt.Sprintf("%s:%s", "/otel-auto-instrumentation-python/opentelemetry/instrumentation/auto_instrumentation", "/otel-auto-instrumentation-python"),
+								},
+								{
+									Name:  "OTEL_EXPORTER_OTLP_PROTOCOL",
+									Value: "http/protobuf",
+								},
+								{
+									Name:  "OTEL_TRACES_EXPORTER",
+									Value: "otlp",
+								},
+								{
+									Name:  "OTEL_METRICS_EXPORTER",
+									Value: "otlp",
+								},
+								{
+									Name:  "OTEL_LOGS_EXPORTER",
+									Value: "otlp",
+								},
+							},
+						},
+					},
+				},
+			},
+			err: nil,
+		},
+		{
+			name:   "platform not supported",
+			Python: v1alpha1.Python{Image: "foo/bar:1"},
+			pod: corev1.Pod{
+				Spec: corev1.PodSpec{
+					Containers: []corev1.Container{
+						{},
+					},
+				},
+			},
+			platform: "not-supported",
+			expected: corev1.Pod{
+				Spec: corev1.PodSpec{
+					Containers: []corev1.Container{
+						{},
+					},
+				},
+			},
+			err: fmt.Errorf("provided instrumentation.opentelemetry.io/otel-python-platform annotation value 'not-supported' is not supported"),
+		},
 	}
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			pod, err := injectPythonSDK(test.Python, test.pod, 0)
+			pod, err := injectPythonSDK(test.Python, test.pod, 0, test.platform)
 			assert.Equal(t, test.expected, pod)
 			assert.Equal(t, test.err, err)
 		})

pkg/instrumentation/sdk.go

@@ -105,7 +105,7 @@ func (i *sdkInjector) inject(ctx context.Context, insts languageInstrumentations
 
 		for _, container := range insts.Python.Containers {
 			index := getContainerIndex(container, pod)
-			pod, err = injectPythonSDK(otelinst.Spec.Python, pod, index)
+			pod, err = injectPythonSDK(otelinst.Spec.Python, pod, index, insts.Python.AdditionalAnnotations[annotationPythonPlatform])
 			if err != nil {
 				i.logger.Info("Skipping Python SDK injection", "reason", err.Error(), "container", pod.Spec.Containers[index].Name)
 			} else {

tests/e2e-instrumentation/instrumentation-python-musl/00-install-collector.yaml

@@ -0,0 +1,22 @@
+apiVersion: opentelemetry.io/v1alpha1
+kind: OpenTelemetryCollector
+metadata:
+  name: sidecar
+spec:
+  config: |
+    receivers:
+      otlp:
+        protocols:
+          grpc:
+          http:
+    processors:
+
+    exporters:
+      debug:
+
+    service:
+      pipelines:
+        traces:
+          receivers: [otlp]
+          exporters: [debug]
+  mode: sidecar

tests/e2e-instrumentation/instrumentation-python-musl/00-install-instrumentation.yaml

@@ -0,0 +1,30 @@
+apiVersion: opentelemetry.io/v1alpha1
+kind: Instrumentation
+metadata:
+  name: python-musl
+spec:
+  env:
+    - name: OTEL_EXPORTER_OTLP_TIMEOUT
+      value: "20"
+    - name: OTEL_TRACES_SAMPLER
+      value: parentbased_traceidratio
+    - name: OTEL_TRACES_SAMPLER_ARG
+      value: "0.85"
+    - name: SPLUNK_TRACE_RESPONSE_HEADER_ENABLED
+      value: "true"
+  exporter:
+    endpoint: http://localhost:4317
+  propagators:
+    - jaeger
+    - b3
+  sampler:
+    type: parentbased_traceidratio
+    argument: "0.25"
+  python:
+    env:
+      - name: OTEL_LOG_LEVEL
+        value: "debug"
+      - name: OTEL_TRACES_EXPORTER
+        value: otlp
+      - name: OTEL_EXPORTER_OTLP_ENDPOINT
+        value: http://localhost:4318