Pod处于pending状态

Question

我做了一个自定义调度程序，如下所示:

root@kmaster:~# cat /etc/kubernetes/manifests/my-scheduler.yaml 
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
labels:
component: kube-scheduler
tier: control-plane
name: my-scheduler
namespace: kube-system
spec:
containers:
- command:
- kube-scheduler
- --authentication-kubeconfig=/etc/kubernetes/scheduler.conf
- --authorization-kubeconfig=/etc/kubernetes/scheduler.conf
- --bind-address=127.0.0.1
- --kubeconfig=/etc/kubernetes/scheduler.conf
- --leader-elect=false
- --port=10261
- --secure-port=10269
env:
- name: no_proxy
value: ',10.74.46.2,10.74.46.3,10.74.46.4'
- name: NO_PROXY
value: ',10.74.46.2,10.74.46.3,10.74.46.4'
- name: HTTPS_PROXY
value: http://127.0.0.1:3129
- name: HTTP_PROXY
value: http://127.0.0.1:3129
image: k8s.gcr.io/kube-scheduler:v1.22.0
imagePullPolicy: IfNotPresent
livenessProbe:
failureThreshold: 8
httpGet:
host: 127.0.0.1
path: /healthz
port: 10269
scheme: HTTPS
initialDelaySeconds: 10
periodSeconds: 10
timeoutSeconds: 15
name: my-scheduler
resources:
requests:
cpu: 100m
startupProbe:
failureThreshold: 24
httpGet:
host: 127.0.0.1
path: /healthz
port: 10269
scheme: HTTPS
initialDelaySeconds: 10
periodSeconds: 10
timeoutSeconds: 15
volumeMounts:
- mountPath: /etc/kubernetes/scheduler.conf
name: kubeconfig
readOnly: true
hostNetwork: true
priorityClassName: system-node-critical
securityContext:
seccompProfile:
type: RuntimeDefault
volumes:
- hostPath:
path: /etc/kubernetes/scheduler.conf
type: FileOrCreate
name: kubeconfig
status: {}
root@kmaster:~# 

我的客户调度程序pod运行成功:

root@kmaster:~# kubectl get pods -n kube-system
NAME                              READY   STATUS    RESTARTS         AGE
coredns-78fcd69978-6dcft          1/1     Running   10 (2d19h ago)   47d
coredns-78fcd69978-8224d          1/1     Running   10 (2d19h ago)   47d
etcd-kmaster                      1/1     Running   4 (21h ago)      15d
kube-apiserver-kmaster            1/1     Running   68 (2d19h ago)   47d
kube-controller-manager-kmaster   1/1     Running   33 (21h ago)     47d
kube-flannel-ds-nvpgz             1/1     Running   11 (2d19h ago)   47d
kube-flannel-ds-xnvvw             1/1     Running   11 (2d19h ago)   47d
kube-flannel-ds-ztgql             1/1     Running   4 (2d19h ago)    47d
kube-proxy-h2t7s                  1/1     Running   4 (2d19h ago)    47d
kube-proxy-pq9t4                  1/1     Running   10 (2d19h ago)   47d
kube-proxy-vgcw7                  1/1     Running   8 (2d19h ago)    47d
kube-scheduler-kmaster            1/1     Running   0                21h
my-scheduler-kmaster              1/1     Running   0                7h17m

然后使用这个调度器创建一个pod:

root@kmaster:~# cat my_pod.yaml 
apiVersion: v1
kind: Pod
metadata:
labels:
run: webapp-color
name: webapp-color
spec:
containers:
- image: 10.74.46.13:5000/webapp-color:v1
name: webapp-color
schedulerName: my-scheduler
root@kmaster:~# 

但是我的pod处于pending状态:

root@kmaster:~# kubectl get pod
NAME           READY   STATUS    RESTARTS   AGE
webapp-color   0/1     Pending   0          4h12m
root@kmaster:~# 

描述pod:

root@kmaster:~# kubectl describe pod webapp-color
Name:         webapp-color
Namespace:    default
Priority:     0
Node:         <none>
Labels:       run=webapp-color
Annotations:  <none>
Status:       Pending
IP:           
IPs:          <none>
Containers:
webapp-color:
Image:        10.74.46.13:5000/webapp-color:v1
Port:         <none>
Host Port:    <none>
Environment:  <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-mkh4z (ro)
Volumes:
kube-api-access-mkh4z:
Type:                    Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds:  3607
ConfigMapName:           kube-root-ca.crt
ConfigMapOptional:       <nil>
DownwardAPI:             true
QoS Class:                   BestEffort
Node-Selectors:              <none>
Tolerations:                 node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:                      <none>
root@kmaster:~# 

Kubernetes版本:

root@kmaster:~# kubectl version --short
Client Version: v1.22.0
Server Version: v1.22.0
root@kmaster:~# 

请帮我查找pod处于pending状态的原因。一点头绪都没有

Pending表示自定义调度程序不工作。但是没有任何理由。

对

Answer 1

调度程序的工作是决定一个pod将在哪个节点上运行。在调度器做出决定之前，pod将处于挂起状态。你的调度程序似乎不能正常工作。

尝试使用:kubectl logs kube-scheduler-kmaster -n kube-system

查看日志查看调度器是否正在做任何决定。