/
create.go
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/
create.go
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/*
Copyright 2019 The Kubernetes 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 pod
import (
"context"
"fmt"
"runtime"
"time"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/uuid"
clientset "k8s.io/client-go/kubernetes"
imageutils "k8s.io/kubernetes/test/utils/image"
)
var (
// BusyBoxImage is the image URI of BusyBox.
BusyBoxImage = imageutils.GetE2EImage(imageutils.BusyBox)
)
// Config is a struct containing all arguments for creating a pod.
// SELinux testing requires to pass HostIPC and HostPID as boolean arguments.
type Config struct {
NS string
PVCs []*v1.PersistentVolumeClaim
PVCsReadOnly bool
InlineVolumeSources []*v1.VolumeSource
IsPrivileged bool
Command string
HostIPC bool
HostPID bool
SeLinuxLabel *v1.SELinuxOptions
FsGroup *int64
NodeSelection NodeSelection
}
// CreateUnschedulablePod with given claims based on node selector
func CreateUnschedulablePod(client clientset.Interface, namespace string, nodeSelector map[string]string, pvclaims []*v1.PersistentVolumeClaim, isPrivileged bool, command string) (*v1.Pod, error) {
pod := MakePod(namespace, nodeSelector, pvclaims, isPrivileged, command)
pod, err := client.CoreV1().Pods(namespace).Create(context.TODO(), pod, metav1.CreateOptions{})
if err != nil {
return nil, fmt.Errorf("pod Create API error: %v", err)
}
// Waiting for pod to become Unschedulable
err = WaitForPodNameUnschedulableInNamespace(client, pod.Name, namespace)
if err != nil {
return pod, fmt.Errorf("pod %q is not Unschedulable: %v", pod.Name, err)
}
// get fresh pod info
pod, err = client.CoreV1().Pods(namespace).Get(context.TODO(), pod.Name, metav1.GetOptions{})
if err != nil {
return pod, fmt.Errorf("pod Get API error: %v", err)
}
return pod, nil
}
// CreateClientPod defines and creates a pod with a mounted PV. Pod runs infinite loop until killed.
func CreateClientPod(c clientset.Interface, ns string, pvc *v1.PersistentVolumeClaim) (*v1.Pod, error) {
return CreatePod(c, ns, nil, []*v1.PersistentVolumeClaim{pvc}, true, "")
}
// CreatePod with given claims based on node selector
func CreatePod(client clientset.Interface, namespace string, nodeSelector map[string]string, pvclaims []*v1.PersistentVolumeClaim, isPrivileged bool, command string) (*v1.Pod, error) {
pod := MakePod(namespace, nodeSelector, pvclaims, isPrivileged, command)
pod, err := client.CoreV1().Pods(namespace).Create(context.TODO(), pod, metav1.CreateOptions{})
if err != nil {
return nil, fmt.Errorf("pod Create API error: %v", err)
}
// Waiting for pod to be running
err = WaitForPodNameRunningInNamespace(client, pod.Name, namespace)
if err != nil {
return pod, fmt.Errorf("pod %q is not Running: %v", pod.Name, err)
}
// get fresh pod info
pod, err = client.CoreV1().Pods(namespace).Get(context.TODO(), pod.Name, metav1.GetOptions{})
if err != nil {
return pod, fmt.Errorf("pod Get API error: %v", err)
}
return pod, nil
}
// CreateSecPod creates security pod with given claims
func CreateSecPod(client clientset.Interface, podConfig *Config, timeout time.Duration) (*v1.Pod, error) {
return CreateSecPodWithNodeSelection(client, podConfig, timeout)
}
// CreateSecPodWithNodeSelection creates security pod with given claims
func CreateSecPodWithNodeSelection(client clientset.Interface, podConfig *Config, timeout time.Duration) (*v1.Pod, error) {
pod, err := MakeSecPod(podConfig)
if err != nil {
return nil, fmt.Errorf("Unable to create pod: %v", err)
}
pod, err = client.CoreV1().Pods(podConfig.NS).Create(context.TODO(), pod, metav1.CreateOptions{})
if err != nil {
return nil, fmt.Errorf("pod Create API error: %v", err)
}
// Waiting for pod to be running
err = WaitTimeoutForPodRunningInNamespace(client, pod.Name, podConfig.NS, timeout)
if err != nil {
return pod, fmt.Errorf("pod %q is not Running: %v", pod.Name, err)
}
// get fresh pod info
pod, err = client.CoreV1().Pods(podConfig.NS).Get(context.TODO(), pod.Name, metav1.GetOptions{})
if err != nil {
return pod, fmt.Errorf("pod Get API error: %v", err)
}
return pod, nil
}
// MakePod returns a pod definition based on the namespace. The pod references the PVC's
// name. A slice of BASH commands can be supplied as args to be run by the pod
func MakePod(ns string, nodeSelector map[string]string, pvclaims []*v1.PersistentVolumeClaim, isPrivileged bool, command string) *v1.Pod {
if len(command) == 0 {
command = "trap exit TERM; while true; do sleep 1; done"
}
podSpec := &v1.Pod{
TypeMeta: metav1.TypeMeta{
Kind: "Pod",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
GenerateName: "pvc-tester-",
Namespace: ns,
},
Spec: v1.PodSpec{
Containers: []v1.Container{
{
Name: "write-pod",
Image: BusyBoxImage,
Command: []string{"/bin/sh"},
Args: []string{"-c", command},
SecurityContext: &v1.SecurityContext{
Privileged: &isPrivileged,
},
},
},
RestartPolicy: v1.RestartPolicyOnFailure,
},
}
var volumeMounts = make([]v1.VolumeMount, len(pvclaims))
var volumes = make([]v1.Volume, len(pvclaims))
for index, pvclaim := range pvclaims {
volumename := fmt.Sprintf("volume%v", index+1)
volumeMounts[index] = v1.VolumeMount{Name: volumename, MountPath: "/mnt/" + volumename}
volumes[index] = v1.Volume{Name: volumename, VolumeSource: v1.VolumeSource{PersistentVolumeClaim: &v1.PersistentVolumeClaimVolumeSource{ClaimName: pvclaim.Name, ReadOnly: false}}}
}
podSpec.Spec.Containers[0].VolumeMounts = volumeMounts
podSpec.Spec.Volumes = volumes
if nodeSelector != nil {
podSpec.Spec.NodeSelector = nodeSelector
}
return podSpec
}
// MakeSecPod returns a pod definition based on the namespace. The pod references the PVC's
// name. A slice of BASH commands can be supplied as args to be run by the pod.
func MakeSecPod(podConfig *Config) (*v1.Pod, error) {
if podConfig.NS == "" {
return nil, fmt.Errorf("Cannot create pod with empty namespace")
}
if len(podConfig.Command) == 0 {
podConfig.Command = "trap exit TERM; while true; do sleep 1; done"
}
podName := "pod-" + string(uuid.NewUUID())
if podConfig.FsGroup == nil && runtime.GOOS != "windows" {
podConfig.FsGroup = func(i int64) *int64 {
return &i
}(1000)
}
podSpec := &v1.Pod{
TypeMeta: metav1.TypeMeta{
Kind: "Pod",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: podName,
Namespace: podConfig.NS,
},
Spec: v1.PodSpec{
HostIPC: podConfig.HostIPC,
HostPID: podConfig.HostPID,
SecurityContext: &v1.PodSecurityContext{
FSGroup: podConfig.FsGroup,
},
Containers: []v1.Container{
{
Name: "write-pod",
Image: imageutils.GetE2EImage(imageutils.BusyBox),
Command: []string{"/bin/sh"},
Args: []string{"-c", podConfig.Command},
SecurityContext: &v1.SecurityContext{
Privileged: &podConfig.IsPrivileged,
},
},
},
RestartPolicy: v1.RestartPolicyOnFailure,
},
}
var volumeMounts = make([]v1.VolumeMount, 0)
var volumeDevices = make([]v1.VolumeDevice, 0)
var volumes = make([]v1.Volume, len(podConfig.PVCs)+len(podConfig.InlineVolumeSources))
volumeIndex := 0
for _, pvclaim := range podConfig.PVCs {
volumename := fmt.Sprintf("volume%v", volumeIndex+1)
if pvclaim.Spec.VolumeMode != nil && *pvclaim.Spec.VolumeMode == v1.PersistentVolumeBlock {
volumeDevices = append(volumeDevices, v1.VolumeDevice{Name: volumename, DevicePath: "/mnt/" + volumename})
} else {
volumeMounts = append(volumeMounts, v1.VolumeMount{Name: volumename, MountPath: "/mnt/" + volumename})
}
volumes[volumeIndex] = v1.Volume{Name: volumename, VolumeSource: v1.VolumeSource{PersistentVolumeClaim: &v1.PersistentVolumeClaimVolumeSource{ClaimName: pvclaim.Name, ReadOnly: podConfig.PVCsReadOnly}}}
volumeIndex++
}
for _, src := range podConfig.InlineVolumeSources {
volumename := fmt.Sprintf("volume%v", volumeIndex+1)
// In-line volumes can be only filesystem, not block.
volumeMounts = append(volumeMounts, v1.VolumeMount{Name: volumename, MountPath: "/mnt/" + volumename})
volumes[volumeIndex] = v1.Volume{Name: volumename, VolumeSource: *src}
volumeIndex++
}
podSpec.Spec.Containers[0].VolumeMounts = volumeMounts
podSpec.Spec.Containers[0].VolumeDevices = volumeDevices
podSpec.Spec.Volumes = volumes
if runtime.GOOS != "windows" {
podSpec.Spec.SecurityContext.SELinuxOptions = podConfig.SeLinuxLabel
}
SetNodeSelection(&podSpec.Spec, podConfig.NodeSelection)
return podSpec, nil
}