/
node.go
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/
node.go
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// Copyright © 2021 Alibaba Group Holding Ltd.
//
// 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 debug
import (
"context"
"fmt"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilrand "k8s.io/apimachinery/pkg/util/rand"
)
// DebugNode can debug a node.
func (debugger *Debugger) DebugNode(ctx context.Context) (*corev1.Pod, error) {
// get the target node object
targetNode, err := debugger.kubeClientCorev1.Nodes().Get(ctx, debugger.TargetName, metav1.GetOptions{})
if err != nil {
return nil, errors.Wrapf(err, "failed to find the target node %s", debugger.TargetName)
}
if err := debugger.addClusterInfoIntoEnv(ctx); err != nil {
return nil, err
}
// add a pod into target node
debugPod, err := debugger.debugNodeByPod(ctx, targetNode)
if err != nil {
return nil, errors.Wrapf(err, "failed to add a pod into node: %s", targetNode.Name)
}
return debugPod, nil
}
// debugNodeByPod runs a pod in target node and use as a debug pod.
func (debugger *Debugger) debugNodeByPod(ctx context.Context, node *corev1.Node) (*corev1.Pod, error) {
pods := debugger.kubeClientCorev1.Pods(debugger.Namespace)
debugPod, err := pods.Create(ctx, debugger.generateDebugPod(node.Name), metav1.CreateOptions{})
if err != nil {
return nil, err
}
return debugPod, nil
}
// generateDebugPod generates a debug pod that schedules on the specified node.
// The generated pod will run in the host PID, Network & IPC namespace, and it will
// have the node's filesystem mounted at /hostfs.
func (debugger *Debugger) generateDebugPod(nodeName string) *corev1.Pod {
cn := PodDebugPrefix
if len(debugger.DebugContainerName) > 0 {
cn = debugger.DebugContainerName
} else {
debugger.DebugContainerName = cn
}
pn := fmt.Sprintf("%s-%s-%s", NodeDebugPrefix, nodeName, utilrand.String(7))
pod := &corev1.Pod{
ObjectMeta: metav1.ObjectMeta{
Name: pn,
},
Spec: corev1.PodSpec{
Containers: []corev1.Container{
{
Name: cn,
Env: debugger.Env,
Image: debugger.Image,
ImagePullPolicy: corev1.PullPolicy(debugger.PullPolicy),
Stdin: true,
TTY: true,
TerminationMessagePolicy: corev1.TerminationMessageReadFile,
VolumeMounts: []corev1.VolumeMount{
{
MountPath: "/hostfs",
Name: "host-root",
},
},
},
},
HostIPC: true,
HostNetwork: true,
HostPID: true,
NodeName: nodeName,
RestartPolicy: corev1.RestartPolicyNever,
Volumes: []corev1.Volume{
{
Name: "host-root",
VolumeSource: corev1.VolumeSource{
HostPath: &corev1.HostPathVolumeSource{Path: "/"},
},
},
},
},
}
return pod
}