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golang.go
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golang.go
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// Copyright The OpenTelemetry Authors
//
// 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 instrumentation
import (
"fmt"
"strings"
corev1 "k8s.io/api/core/v1"
"github.com/open-telemetry/opentelemetry-operator/apis/v1alpha1"
"github.com/open-telemetry/opentelemetry-operator/internal/config"
)
const (
envOtelTargetExe = "OTEL_GO_AUTO_TARGET_EXE"
kernelDebugVolumeName = "kernel-debug"
kernelDebugVolumePath = "/sys/kernel/debug"
)
func injectGoSDK(goSpec v1alpha1.Go, pod corev1.Pod, cfg config.Config) (corev1.Pod, error) {
// skip instrumentation if share process namespaces is explicitly disabled
if pod.Spec.ShareProcessNamespace != nil && !*pod.Spec.ShareProcessNamespace {
return pod, fmt.Errorf("shared process namespace has been explicitly disabled")
}
// skip instrumentation when more than one containers provided
containerNames := ""
ok := false
if cfg.EnableMultiInstrumentation() {
containerNames, ok = pod.Annotations[annotationInjectGoContainersName]
} else {
containerNames, ok = pod.Annotations[annotationInjectContainerName]
}
if ok && len(strings.Split(containerNames, ",")) > 1 {
return pod, fmt.Errorf("go instrumentation cannot be injected into a pod, multiple containers configured")
}
true := true
zero := int64(0)
pod.Spec.ShareProcessNamespace = &true
goAgent := corev1.Container{
Name: sideCarName,
Image: goSpec.Image,
Resources: goSpec.Resources,
SecurityContext: &corev1.SecurityContext{
RunAsUser: &zero,
Privileged: &true,
},
VolumeMounts: []corev1.VolumeMount{
{
MountPath: "/sys/kernel/debug",
Name: kernelDebugVolumeName,
},
},
}
// Annotation takes precedence for OTEL_GO_AUTO_TARGET_EXE
execPath, ok := pod.Annotations[annotationGoExecPath]
if ok {
goAgent.Env = append(goAgent.Env, corev1.EnvVar{
Name: envOtelTargetExe,
Value: execPath,
})
}
// Inject Go instrumentation spec env vars.
// For Go, env vars must be added to the agent contain
for _, env := range goSpec.Env {
idx := getIndexOfEnv(goAgent.Env, env.Name)
if idx == -1 {
goAgent.Env = append(goAgent.Env, env)
}
}
pod.Spec.Containers = append(pod.Spec.Containers, goAgent)
pod.Spec.Volumes = append(pod.Spec.Volumes, corev1.Volume{
Name: kernelDebugVolumeName,
VolumeSource: corev1.VolumeSource{
HostPath: &corev1.HostPathVolumeSource{
Path: kernelDebugVolumePath,
},
},
})
return pod, nil
}