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pod.go
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pod.go
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package k8sutil
import (
"fmt"
corev1 "k8s.io/api/core/v1"
)
type PodStatusReason string
const (
PodStatusReasonRunning PodStatusReason = "Running"
PodStatusReasonError PodStatusReason = "Error"
PodStatusReasonNotReady PodStatusReason = "NotReady"
PodStatusReasonUnknown PodStatusReason = "Unknown"
PodStatusReasonShutdown PodStatusReason = "Shutdown"
PodStatusReasonTerminating PodStatusReason = "Terminating"
PodStatusReasonCrashLoopBackOff PodStatusReason = "CrashLoopBackOff"
PodStatusReasonImagePullBackOff PodStatusReason = "ImagePullBackOff"
PodStatusReasonContainerCreating PodStatusReason = "ContainerCreating"
PodStatusReasonPending PodStatusReason = "Pending"
PodStatusReasonCompleted PodStatusReason = "Completed"
PodStatusReasonEvicted PodStatusReason = "Evicted"
PodStatusReasonInitError PodStatusReason = "Init:Error"
PodStatusReasonInitCrashLoopBackOff PodStatusReason = "Init:CrashLoopBackOff"
)
// reference: https://github.com/kubernetes/kubernetes/blob/e8fcd0de98d50f4019561a6b7a0287f5c059267a/pkg/printers/internalversion/printers.go#L741
func GetPodStatusReason(pod *corev1.Pod) (string, string) {
reason := string(pod.Status.Phase)
// message is used to store more detailed information about the pod status
message := ""
if pod.Status.Reason != "" {
reason = pod.Status.Reason
}
initializing := false
for i := range pod.Status.InitContainerStatuses {
container := pod.Status.InitContainerStatuses[i]
switch {
case container.State.Terminated != nil && container.State.Terminated.ExitCode == 0:
continue
case container.State.Terminated != nil:
// initialization is failed
if len(container.State.Terminated.Reason) == 0 {
if container.State.Terminated.Signal != 0 {
reason = fmt.Sprintf("Init:Signal:%d", container.State.Terminated.Signal)
} else {
reason = fmt.Sprintf("Init:ExitCode:%d", container.State.Terminated.ExitCode)
}
} else {
reason = "Init:" + container.State.Terminated.Reason
}
initializing = true
case container.State.Waiting != nil && len(container.State.Waiting.Reason) > 0 && container.State.Waiting.Reason != "PodInitializing":
reason = "Init:" + container.State.Waiting.Reason
initializing = true
default:
reason = fmt.Sprintf("Init:%d/%d", i, len(pod.Spec.InitContainers))
initializing = true
}
if container.LastTerminationState.Terminated != nil && container.LastTerminationState.Terminated.Message != "" {
message += container.LastTerminationState.Terminated.Message
}
break
}
if !initializing {
hasRunning := false
for i := len(pod.Status.ContainerStatuses) - 1; i >= 0; i-- {
container := pod.Status.ContainerStatuses[i]
if container.State.Waiting != nil && container.State.Waiting.Reason != "" {
reason = container.State.Waiting.Reason
if container.LastTerminationState.Terminated != nil {
// if the container is terminated, we should use the message from the last termination state
// if no message from the last termination state, we should use the exit code
if container.LastTerminationState.Terminated.Message != "" {
message += container.LastTerminationState.Terminated.Message
} else {
message += fmt.Sprintf("ExitCode:%d", container.LastTerminationState.Terminated.ExitCode)
}
}
} else if container.State.Terminated != nil && container.State.Terminated.Reason != "" {
reason = container.State.Terminated.Reason
// add message from the last termination exit code
message += fmt.Sprintf("ExitCode:%d", container.State.Terminated.ExitCode)
} else if container.State.Terminated != nil && container.State.Terminated.Reason == "" {
// no extra message from the last termination state, since the signal or exit code is used as the reason
if container.State.Terminated.Signal != 0 {
reason = fmt.Sprintf("Signal:%d", container.State.Terminated.Signal)
} else {
reason = fmt.Sprintf("ExitCode:%d", container.State.Terminated.ExitCode)
}
} else if container.Ready && container.State.Running != nil {
hasRunning = true
}
}
// change pod status back to "Running" if there is at least one container still reporting as "Running" status
if reason == "Completed" && hasRunning {
if hasPodReadyCondition(pod.Status.Conditions) {
reason = "Running"
} else {
reason = "NotReady"
}
}
// if the pod is not running, check if there is any pod condition reporting as "False" status
if len(pod.Status.Conditions) > 0 {
for condition := range pod.Status.Conditions {
if pod.Status.Conditions[condition].Type == corev1.PodScheduled && pod.Status.Conditions[condition].Status == corev1.ConditionFalse {
message += pod.Status.Conditions[condition].Message
}
}
}
}
// "NodeLost" is originally k8s.io/kubernetes/pkg/util/node.NodeUnreachablePodReason but didn't wanna import all of kubernetes package just for this type
if pod.DeletionTimestamp != nil && pod.Status.Reason == "NodeLost" {
reason = "Unknown"
} else if pod.DeletionTimestamp != nil {
reason = "Terminating"
}
return reason, message
}
func hasPodReadyCondition(conditions []corev1.PodCondition) bool {
for _, condition := range conditions {
if condition.Type == corev1.PodReady && condition.Status == corev1.ConditionTrue {
return true
}
}
return false
}
func IsPodUnhealthy(pod *corev1.Pod) bool {
if pod.Status.Phase == corev1.PodFailed || pod.Status.Phase == corev1.PodPending || pod.Status.Phase == corev1.PodUnknown {
return true
}
reason, _ := GetPodStatusReason(pod)
if PodStatusReason(reason) == PodStatusReasonCompleted {
return false // completed pods are healthy pods
}
if PodStatusReason(reason) != PodStatusReasonRunning {
return true // pods that are not completed or running are unhealthy
}
// running pods with unready containers are not healthy
for _, containerStatus := range pod.Status.ContainerStatuses {
if !containerStatus.Ready {
return true
}
}
return false
}