153 lines
4.1 KiB
Go
153 lines
4.1 KiB
Go
/*
|
|
Copyright 2020 The Kubernetes Authors All rights reserved.
|
|
|
|
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 kverify verifies a running Kubernetes cluster is healthy
|
|
package kverify
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/pkg/errors"
|
|
v1 "k8s.io/api/core/v1"
|
|
meta "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/client-go/kubernetes"
|
|
"k8s.io/klog/v2"
|
|
kconst "k8s.io/kubernetes/cmd/kubeadm/app/constants"
|
|
"k8s.io/minikube/pkg/util/retry"
|
|
)
|
|
|
|
// NodeCondition represents a favorable or unfavorable node condition.
|
|
type NodeCondition struct {
|
|
Type v1.NodeConditionType
|
|
Status v1.ConditionStatus
|
|
Reason string
|
|
Message string
|
|
}
|
|
|
|
// DiskPressure detects if the condition is disk pressure
|
|
func (pc *NodeCondition) DiskPressure() bool {
|
|
return pc.Type == v1.NodeDiskPressure && pc.Status == v1.ConditionTrue
|
|
}
|
|
|
|
// MemoryPressure detects if the condition is memory pressure
|
|
func (pc *NodeCondition) MemoryPressure() bool {
|
|
return pc.Type == v1.NodeMemoryPressure && pc.Status == v1.ConditionTrue
|
|
}
|
|
|
|
// PIDPressure detects if the condition is PID pressure
|
|
func (pc *NodeCondition) PIDPressure() bool {
|
|
return pc.Type == v1.NodePIDPressure && pc.Status == v1.ConditionTrue
|
|
}
|
|
|
|
// NetworkUnavailable detects if the condition is PID pressure
|
|
func (pc *NodeCondition) NetworkUnavailable() bool {
|
|
return pc.Type == v1.NodeNetworkUnavailable && pc.Status == v1.ConditionTrue
|
|
}
|
|
|
|
const errTextFormat = "node has unwanted condition %q : Reason %q Message: %q"
|
|
|
|
// ErrMemoryPressure is thrown when there is node memory pressure condition
|
|
type ErrMemoryPressure struct {
|
|
NodeCondition
|
|
}
|
|
|
|
func (e *ErrMemoryPressure) Error() string {
|
|
return fmt.Sprintf(errTextFormat, e.Type, e.Reason, e.Message)
|
|
}
|
|
|
|
// ErrDiskPressure is thrown when there is node disk pressure condition
|
|
type ErrDiskPressure struct {
|
|
NodeCondition
|
|
}
|
|
|
|
func (e *ErrDiskPressure) Error() string {
|
|
return fmt.Sprintf(errTextFormat, e.Type, e.Reason, e.Message)
|
|
}
|
|
|
|
// ErrPIDPressure is thrown when there is node PID pressure condition
|
|
type ErrPIDPressure struct {
|
|
NodeCondition
|
|
}
|
|
|
|
func (e *ErrPIDPressure) Error() string {
|
|
return fmt.Sprintf(errTextFormat, e.Type, e.Reason, e.Message)
|
|
}
|
|
|
|
// ErrNetworkNotReady is thrown when there is node condition is network not ready
|
|
type ErrNetworkNotReady struct {
|
|
NodeCondition
|
|
}
|
|
|
|
func (e *ErrNetworkNotReady) Error() string {
|
|
return fmt.Sprintf(errTextFormat, e.Type, e.Reason, e.Message)
|
|
}
|
|
|
|
// NodePressure verfies that node is not under disk, memory, pid or network pressure.
|
|
func NodePressure(cs *kubernetes.Clientset) error {
|
|
klog.Info("verifying NodePressure condition ...")
|
|
start := time.Now()
|
|
defer func() {
|
|
klog.Infof("duration metric: took %s to run NodePressure ...", time.Since(start))
|
|
}()
|
|
|
|
var ns *v1.NodeList
|
|
var err error
|
|
|
|
listNodes := func() error {
|
|
ns, err = cs.CoreV1().Nodes().List(meta.ListOptions{})
|
|
return err
|
|
}
|
|
|
|
err = retry.Expo(listNodes, kconst.APICallRetryInterval, 2*time.Minute)
|
|
if err != nil {
|
|
return errors.Wrap(err, "list nodes retry")
|
|
}
|
|
|
|
for _, n := range ns.Items {
|
|
klog.Infof("node storage ephemeral capacity is %s", n.Status.Capacity.StorageEphemeral())
|
|
klog.Infof("node cpu capacity is %s", n.Status.Capacity.Cpu().AsDec())
|
|
for _, c := range n.Status.Conditions {
|
|
pc := NodeCondition{Type: c.Type, Status: c.Status, Reason: c.Reason, Message: c.Message}
|
|
if pc.DiskPressure() {
|
|
return &ErrDiskPressure{
|
|
NodeCondition: pc,
|
|
}
|
|
}
|
|
|
|
if pc.MemoryPressure() {
|
|
return &ErrMemoryPressure{
|
|
NodeCondition: pc,
|
|
}
|
|
}
|
|
|
|
if pc.PIDPressure() {
|
|
return &ErrPIDPressure{
|
|
NodeCondition: pc,
|
|
}
|
|
}
|
|
|
|
if pc.NetworkUnavailable() {
|
|
return &ErrNetworkNotReady{
|
|
NodeCondition: pc,
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
return nil
|
|
}
|