我最近开始使用kubernetes。我已经迷惑了FailedScheduling <unknown> default-scheduler 0/1 nodes are available: 1 node(s) were unschedulable，不确定是怎么回事。
是因为节点上没有足够的资源用于新的Pod，我需要增加它吗？看起来它似乎并没有使用100％的内存或cpu。
这是我的豆荚kubectl describe pods plex-kube-plex-986cc6d98-lwns7 --namespace plex
Name: plex-kube-plex-986cc6d98-lwns7
Namespace: plex
Priority: 0
Node: <none>
Labels: app=kube-plex
pod-template-hash=986cc6d98
release=plex
Annotations: <none>
Status: Pending
IP:
IPs: <none>
Controlled By: ReplicaSet/plex-kube-plex-986cc6d98
Init Containers:
kube-plex-install:
Image: quay.io/munnerz/kube-plex:latest
Port: <none>
Host Port: <none>
Command:
cp
/kube-plex
/shared/kube-plex
Environment: <none>
Mounts:
/shared from shared (rw)
/var/run/secrets/kubernetes.io/serviceaccount from plex-kube-plex-token-txkbn (ro)
Containers:
plex:
Image: plexinc/pms-docker:1.16.0.1226-7eb2c8f6f
Ports: 32400/TCP, 32400/TCP, 32443/TCP
Host Ports: 0/TCP, 0/TCP, 0/TCP
Liveness: http-get http://:32400/identity delay=10s timeout=10s period=10s #success=1 #failure=3
Readiness: http-get http://:32400/identity delay=15s timeout=5s period=10s #success=1 #failure=3
Environment:
TZ: Europe/London
PLEX_CLAIM: [claim-PooPBMsbyEjyigT-_hec]
PMS_INTERNAL_ADDRESS: http://plex-kube-plex:32400
PMS_IMAGE: plexinc/pms-docker:1.16.0.1226-7eb2c8f6f
KUBE_NAMESPACE: plex (v1:metadata.namespace)
TRANSCODE_PVC: plex-kube-plex-transcode
DATA_PVC: plex-kube-plex-data
CONFIG_PVC: plex-kube-plex-config
Mounts:
/config from config (rw)
/data from data (rw)
/shared from shared (rw)
/transcode from transcode (rw)
/var/run/secrets/kubernetes.io/serviceaccount from plex-kube-plex-token-txkbn (ro)
Conditions:
Type Status
PodScheduled False
Volumes:
data:
Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
ClaimName: plex-kube-plex-data
ReadOnly: false
config:
Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
ClaimName: plex-kube-plex-config
ReadOnly: false
transcode:
Type: EmptyDir (a temporary directory that shares a pod's lifetime)
Medium:
SizeLimit: <unset>
shared:
Type: EmptyDir (a temporary directory that shares a pod's lifetime)
Medium:
SizeLimit: <unset>
plex-kube-plex-token-txkbn:
Type: Secret (a volume populated by a Secret)
SecretName: plex-kube-plex-token-txkbn
Optional: false
QoS Class: BestEffort
Node-Selectors: beta.kubernetes.io/arch=amd64
Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
node.kubernetes.io/unreachable:NoExecute for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning FailedScheduling <unknown> default-scheduler 0/1 nodes are available: 1 node(s) were unschedulable.
Warning FailedScheduling <unknown> default-scheduler 0/1 nodes are available: 1 node(s) were unschedulable.
这是我通过minikube kubectl describe node minikube --namespace plex
Name: minikube
Roles: master
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/arch=amd64
kubernetes.io/hostname=minikube
kubernetes.io/os=linux
minikube.k8s.io/commit=93af9c1e43cab9618e301bc9fa720c63d5efa393
minikube.k8s.io/name=minikube
minikube.k8s.io/updated_at=2020_05_03T16_34_44_0700
minikube.k8s.io/version=v1.9.2
node-role.kubernetes.io/master=
Annotations: kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock
node.alpha.kubernetes.io/ttl: 0
volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp: Sun, 03 May 2020 16:34:38 +1000
Taints: node.kubernetes.io/unschedulable:NoSchedule
Unschedulable: true
Lease:
HolderIdentity: minikube
AcquireTime: <unset>
RenewTime: Thu, 18 Jun 2020 18:02:37 +1000
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
MemoryPressure False Thu, 18 Jun 2020 18:01:11 +1000 Sun, 03 May 2020 16:34:33 +1000 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Thu, 18 Jun 2020 18:01:11 +1000 Sun, 03 May 2020 16:34:33 +1000 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Thu, 18 Jun 2020 18:01:11 +1000 Sun, 03 May 2020 16:34:33 +1000 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Thu, 18 Jun 2020 18:01:11 +1000 Sun, 03 May 2020 16:34:58 +1000 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 172.17.0.2
Hostname: minikube
Capacity:
cpu: 4
ephemeral-storage: 120997584Ki
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 8037176Ki
pods: 110
Allocatable:
cpu: 4
ephemeral-storage: 120997584Ki
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 8037176Ki
pods: 110
System Info:
Machine ID: 21e345365a7e45a8ad5560eb273be8e5
System UUID: 4b9e17f2-ea81-436d-bff9-1db34db18512
Boot ID: 6d7e3f0c-ce11-4860-a479-2d6dbfd72779
Kernel Version: 4.15.0-101-generic
OS Image: Ubuntu 19.10
Operating System: linux
Architecture: amd64
Container Runtime Version: docker://19.3.2
Kubelet Version: v1.18.0
Kube-Proxy Version: v1.18.0
PodCIDR: 10.244.0.0/24
PodCIDRs: 10.244.0.0/24
Non-terminated Pods: (11 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE
--------- ---- ------------ ---------- --------------- ------------- ---
kube-system coredns-66bff467f8-4psrb 100m (2%) 0 (0%) 70Mi (0%) 170Mi (2%) 46d
kube-system coredns-66bff467f8-jgpgh 100m (2%) 0 (0%) 70Mi (0%) 170Mi (2%) 46d
kube-system etcd-minikube 0 (0%) 0 (0%) 0 (0%) 0 (0%) 46d
kube-system kindnet-jzf4m 100m (2%) 100m (2%) 50Mi (0%) 50Mi (0%) 46d
kube-system kube-apiserver-minikube 250m (6%) 0 (0%) 0 (0%) 0 (0%) 46d
kube-system kube-controller-manager-minikube 200m (5%) 0 (0%) 0 (0%) 0 (0%) 46d
kube-system kube-proxy-hffcf 0 (0%) 0 (0%) 0 (0%) 0 (0%) 46d
kube-system kube-scheduler-minikube 100m (2%) 0 (0%) 0 (0%) 0 (0%) 46d
kube-system storage-provisioner 0 (0%) 0 (0%) 0 (0%) 0 (0%) 46d
kubernetes-dashboard dashboard-metrics-scraper-84bfdf55ff-2jc84 0 (0%) 0 (0%) 0 (0%) 0 (0%) 43d
kubernetes-dashboard kubernetes-dashboard-bc446cc64-kfk8z 0 (0%) 0 (0%) 0 (0%) 0 (0%) 43d
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
Resource Requests Limits
-------- -------- ------
cpu 850m (21%) 100m (2%)
memory 190Mi (2%) 390Mi (4%)
ephemeral-storage 0 (0%) 0 (0%)
hugepages-1Gi 0 (0%) 0 (0%)
hugepages-2Mi 0 (0%) 0 (0%)
Events: <none>
答案 0 :(得分：2)
这是因为该节点被标记为Unschedulable:true，并且有污点node.kubernetes.io/unschedulable:NoSchedule
您可以删除该污渍并尝试
kubectl taint node minikube node.kubernetes.io/unschedulable:NoSchedule-
答案 1 :(得分：1)
遇到了同样的问题，@Arghya Sadhu 的回答确实有帮助。
$ kubectl patch nodes minikube --patch '{"spec":{"unschedulable": false}}'
足以更新注释。
紧接着，我注意到 kubectl 有 cordon 和 uncordon 来“将节点标记为不可/可调度”。