网站开发的付款方式,石家庄网站如何制作,长春做网站公司哪家好,网站规划的任务不同的PV可以使用相同的StorageClass#xff0c;它们是一对多的关系。 PV可以设置节点亲和性。比如下图#xff0c;local-storage-class-waitforfirstconsumer-pv-ubuntuc只能在节点ubuntuc上#xff1b;local-storage-class-waitforfirstconsumer-pv-ubuntud只能在节点ubu…不同的PV可以使用相同的StorageClass它们是一对多的关系。 PV可以设置节点亲和性。比如下图local-storage-class-waitforfirstconsumer-pv-ubuntuc只能在节点ubuntuc上local-storage-class-waitforfirstconsumer-pv-ubuntud只能在节点ubuntud上。
如果我们使用《研发工程师玩转Kubernetes——PVC使用storageClassName选择PV》一文中的“立即绑定”型的StorageClass。
# local_storage_class_immediate.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:name: local-storage-class-immediate
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: Immediate则在创建PVC时立即会选择一个PV。这样这个PVC可能绑定到节点ubuntuc对应的PV上也可能绑定到节点ubuntud对应的PV上。现在我们假定它绑定到ubuntuc对应的PV——local-storage-class-immediate-pv-ubuntuc上。 假如PVC的使用者——Pod在调度时清单文件要求它只能在ubuntud上使用。而其PVC却在ubuntuc上则会调度失败。
立即绑定导致Pod调度失败的案例
StorageClass
注意volumeBindingMode是Immediate即PVC创建时立即绑定PV。
# local_storage_class_immediate.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:name: local-storage-class-immediate
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: ImmediatePersistentVolume
ubuntuc
# local_storage_class_immediate_pv_ubuntuc.yaml
apiVersion: v1
kind: PersistentVolume
metadata:name: local-storage-class-immediate-pv-ubuntuc
spec:capacity:storage: 1MivolumeMode: FilesystemaccessModes:- ReadWriteOncepersistentVolumeReclaimPolicy: DeletestorageClassName: local-storage-class-immediatelocal:path: /tmpnodeAffinity:required:nodeSelectorTerms:- matchExpressions:- key: kubernetes.io/hostnameoperator: Invalues:- ubuntucubuntud
# local_storage_class_immediate_pv_ubuntud.yaml
apiVersion: v1
kind: PersistentVolume
metadata:name: local-storage-class-immediate-pv-ubuntud
spec:capacity:storage: 1MivolumeMode: FilesystemaccessModes:- ReadWriteOncepersistentVolumeReclaimPolicy: DeletestorageClassName: local-storage-class-immediatelocal:path: /tmpnodeAffinity:required:nodeSelectorTerms:- matchExpressions:- key: kubernetes.io/hostnameoperator: Invalues:- ubuntudPersistentVolumeClaim
# local_storage_class_immediate_pvc_600k.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:name: local-storage-class-immediate-pvc-600k
spec:resources:requests:storage: 600KiaccessModes:- ReadWriteOncestorageClassName: local-storage-class-immediate创建完上述组件我们查看下PVC的状态。
kubectl describe persistentvolumeclaims local-storage-class-immediate-pvc-600k Name: local-storage-class-immediate-pvc-600k
Namespace: default
StorageClass: local-storage-class-immediate
Status: Bound
Volume: local-storage-class-immediate-pv-ubuntuc
Labels: none
Annotations: pv.kubernetes.io/bind-completed: yespv.kubernetes.io/bound-by-controller: yes
Finalizers: [kubernetes.io/pvc-protection]
Capacity: 1Mi
Access Modes: RWO
VolumeMode: Filesystem
Used By: none
Events: none可以看到这个PVC处于绑定状态。
Deployment
# local_deployment_immediate.yaml
apiVersion: apps/v1
kind: Deployment
metadata:name: local-pv-app-immediate-deployment
spec:replicas: 1selector:matchLabels:app: local-pv-app-immediatetemplate:metadata:labels:app: local-pv-app-immediatespec:containers:- name: local-pv-app-immediateimage: busyboxcommand: [/bin/sh, -c, if [ -f /tempdir/lockfile ] ! { set -C; 2/dev/null /tempdir/lockfile; }; then tail -f /tempdir/lockfile; else exec 3/tempdir/lockfile; if [ -n \$POD_NAME\ ]; then name$POD_NAME; else name\unknown\; fi; while true; do echo \this is $name.$name write something to lockfile\; echo \$name write something to lockfile\ 3; sleep 1; done; fi] volumeMounts:- name: local-pvc-volumemountPath: /tempdirenv:- name: POD_NAMEvalueFrom:fieldRef:fieldPath: metadata.namevolumes:- name: local-pvc-volumepersistentVolumeClaim:claimName: local-storage-class-immediate-pvc-600kaffinity:nodeAffinity:requiredDuringSchedulingIgnoredDuringExecution:nodeSelectorTerms:- matchExpressions:- key: kubernetes.io/hostnameoperator: Invalues:- ubuntud 这个清单要求Pod使用local-storage-class-immediate-pvc-600k这个PVC但是要求自己只能被部署在节点ubuntud上。
错误表现
kubectl describe pod local-pv-app-immediate-deployment-6dd57d98f5-s5vpz Name: local-pv-app-immediate-deployment-6dd57d98f5-s5vpz
Namespace: default
Priority: 0
Service Account: default
Node: none
Labels: applocal-pv-app-immediatepod-template-hash6dd57d98f5
Annotations: none
Status: Pending
IP:
IPs: none
Controlled By: ReplicaSet/local-pv-app-immediate-deployment-6dd57d98f5
Containers:local-pv-app-immediate:Image: busyboxPort: noneHost Port: noneCommand:/bin/sh-cif [ -f /tempdir/lockfile ] ! { set -C; 2/dev/null /tempdir/lockfile; }; then tail -f /tempdir/lockfile; else exec 3/tempdir/lockfile; if [ -n $POD_NAME ]; then name$POD_NAME; else nameunknown; fi; while true; do echo this is $name.$name write something to lockfile; echo $name write something to lockfile 3; sleep 1; done; fiEnvironment:POD_NAME: local-pv-app-immediate-deployment-6dd57d98f5-s5vpz (v1:metadata.name)Mounts:/tempdir from local-pvc-volume (rw)/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-r48fn (ro)
Conditions:Type StatusPodScheduled False
Volumes:local-pvc-volume:Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)ClaimName: local-storage-class-immediate-pvc-600kReadOnly: falsekube-api-access-r48fn:Type: Projected (a volume that contains injected data from multiple sources)TokenExpirationSeconds: 3607ConfigMapName: kube-root-ca.crtConfigMapOptional: nilDownwardAPI: true
QoS Class: BestEffort
Node-Selectors: none
Tolerations: node.kubernetes.io/not-ready:NoExecute opExists for 300snode.kubernetes.io/unreachable:NoExecute opExists for 300s
Events:Type Reason Age From Message---- ------ ---- ---- -------Warning FailedScheduling 8s default-scheduler 0/5 nodes are available: 1 node(s) didnt match Pods node affinity/selector. preemption: 0/5 nodes are available: 1 Preemption is not helpful for scheduling, 4 No preemption victims found for incoming pod..可以看到Pod调度失败处于Pending状态。
延迟绑定导致Pod调度成功的案例
StorageClass
注意volumeBindingMode是WaitForFirstConsumer即PVC创建时不绑定PV。而在PVC被使用Pod被调度到时绑定PV。
# local_storage_class_waitforfirstconsumer.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:name: local-storage-class-waitforfirstconsumer
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumerPersistentVolume
和之前的PV设置相似核心就是storageClassName不同使用了延迟绑定的StorageClass。
ubuntuc
# local_storage_class_waitforfirstconsumer_pv_ubuntuc.yaml
apiVersion: v1
kind: PersistentVolume
metadata:name: local-storage-class-waitforfirstconsumer-pv-ubuntuc
spec:capacity:storage: 1MivolumeMode: FilesystemaccessModes:- ReadWriteOncepersistentVolumeReclaimPolicy: DeletestorageClassName: local-storage-class-waitforfirstconsumerlocal:path: /tmpnodeAffinity:required:nodeSelectorTerms:- matchExpressions:- key: kubernetes.io/hostnameoperator: Invalues:- ubuntucubuntud
# local_storage_class_waitforfirstconsumer_pv_ubuntud.yaml
apiVersion: v1
kind: PersistentVolume
metadata:name: local-storage-class-waitforfirstconsumer-pv-ubuntud
spec:capacity:storage: 1MivolumeMode: FilesystemaccessModes:- ReadWriteOncepersistentVolumeReclaimPolicy: DeletestorageClassName: local-storage-class-waitforfirstconsumerlocal:path: /tmpnodeAffinity:required:nodeSelectorTerms:- matchExpressions:- key: kubernetes.io/hostnameoperator: Invalues:- ubuntudPersistentVolumeClaim
和之前例子的区别就是storageClassName选择了延迟绑定的local-storage-class-waitforfirstconsumer。
# local_storage_class_waitforfirstconsumer_pvc_600k.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:name: local-storage-class-waitforfirstconsumer-pvc-600k
spec:resources:requests:storage: 600KiaccessModes:- ReadWriteOncestorageClassName: local-storage-class-waitforfirstconsumer我们先创建上述组件然后观察PVC的状态。
kubectl describe persistentvolumeclaims local-storage-class-waitforfirstconsumer-pvc-600kName: local-storage-class-waitforfirstconsumer-pvc-600k
Namespace: default
StorageClass: local-storage-class-waitforfirstconsumer
Status: Pending
Volume:
Labels: none
Annotations: none
Finalizers: [kubernetes.io/pvc-protection]
Capacity:
Access Modes:
VolumeMode: Filesystem
Used By: none
Events:Type Reason Age From Message---- ------ ---- ---- -------Normal WaitForFirstConsumer 2s (x2 over 11s) persistentvolume-controller waiting for first consumer to be created before binding可以看到这次PVC没有立即绑定而是处于Pending状态且原因是等待第一个使用者触发绑定。
Deployment
# local_deployment_waitforfirstconsumer.yaml
apiVersion: apps/v1
kind: Deployment
metadata:name: local-pv-app-waitforfirstconsumer-deployment
spec:replicas: 1selector:matchLabels:app: local-pv-app-waitforfirstconsumertemplate:metadata:labels:app: local-pv-app-waitforfirstconsumerspec:containers:- name: local-pv-app-waitforfirstconsumerimage: busyboxcommand: [/bin/sh, -c, if [ -f /tempdir/lockfile ] ! { set -C; 2/dev/null /tempdir/lockfile; }; then tail -f /tempdir/lockfile; else exec 3/tempdir/lockfile; if [ -n \$POD_NAME\ ]; then name$POD_NAME; else name\unknown\; fi; while true; do echo \this is $name.$name write something to lockfile\; echo \$name write something to lockfile\ 3; sleep 1; done; fi] volumeMounts:- name: local-pvc-volumemountPath: /tempdirenv:- name: POD_NAMEvalueFrom:fieldRef:fieldPath: metadata.namevolumes:- name: local-pvc-volumepersistentVolumeClaim:claimName: local-storage-class-waitforfirstconsumer-pvc-600kaffinity:nodeAffinity:requiredDuringSchedulingIgnoredDuringExecution:nodeSelectorTerms:- matchExpressions:- key: kubernetes.io/hostnameoperator: Invalues:- ubuntud 创建完我们查看Pod的状态。
kubectl describe pod local-pv-app-waitforfirstconsumer-deployment-84449895c4-x7ddxName: local-pv-app-waitforfirstconsumer-deployment-84449895c4-x7ddx
Namespace: default
Priority: 0
Service Account: default
Node: ubuntud/172.22.244.197
Start Time: Wed, 09 Aug 2023 17:07:01 0000
Labels: applocal-pv-app-waitforfirstconsumerpod-template-hash84449895c4
Annotations: cni.projectcalico.org/containerID: cb10dba20771f872b242bc6284eb9d790565b7f2c1a2fbb096ff1581a73d4de5cni.projectcalico.org/podIP: 10.1.202.206/32cni.projectcalico.org/podIPs: 10.1.202.206/32
Status: Running
IP: 10.1.202.206
IPs:IP: 10.1.202.206
Controlled By: ReplicaSet/local-pv-app-waitforfirstconsumer-deployment-84449895c4
Containers:local-pv-app-waitforfirstconsumer:Container ID: containerd://3fda11a2670236dc37409dd1fd6c5efae36d48bbcf1ce71266f72bd7b0b55b98Image: busyboxImage ID: docker.io/library/busyboxsha256:3fbc632167424a6d997e74f52b878d7cc478225cffac6bc977eedfe51c7f4e79Port: noneHost Port: noneCommand:/bin/sh-cif [ -f /tempdir/lockfile ] ! { set -C; 2/dev/null /tempdir/lockfile; }; then tail -f /tempdir/lockfile; else exec 3/tempdir/lockfile; if [ -n $POD_NAME ]; then name$POD_NAME; else nameunknown; fi; while true; do echo this is $name.$name write something to lockfile; echo $name write something to lockfile 3; sleep 1; done; fiState: RunningStarted: Wed, 09 Aug 2023 17:07:04 0000Ready: TrueRestart Count: 0Environment:POD_NAME: local-pv-app-waitforfirstconsumer-deployment-84449895c4-x7ddx (v1:metadata.name)Mounts:/tempdir from local-pvc-volume (rw)/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-52426 (ro)
Conditions:Type StatusInitialized True Ready True ContainersReady True PodScheduled True
Volumes:local-pvc-volume:Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)ClaimName: local-storage-class-waitforfirstconsumer-pvc-600kReadOnly: falsekube-api-access-52426:Type: Projected (a volume that contains injected data from multiple sources)TokenExpirationSeconds: 3607ConfigMapName: kube-root-ca.crtConfigMapOptional: nilDownwardAPI: true
QoS Class: BestEffort
Node-Selectors: none
Tolerations: node.kubernetes.io/not-ready:NoExecute opExists for 300snode.kubernetes.io/unreachable:NoExecute opExists for 300s
Events:Type Reason Age From Message---- ------ ---- ---- -------Normal Scheduled 8s default-scheduler Successfully assigned default/local-pv-app-waitforfirstconsumer-deployment-84449895c4-x7ddx to ubuntudNormal Pulling 8s kubelet Pulling image busyboxNormal Pulled 5s kubelet Successfully pulled image busybox in 2.266071612s (2.266078813s including waiting)Normal Created 5s kubelet Created container local-pv-app-waitforfirstconsumerNormal Started 5s kubelet Started container local-pv-app-waitforfirstconsumer可以看到Pod按清单要求被成功调度到ubuntud上。
kubectl describe persistentvolumeclaims local-storage-class-waitforfirstconsumer-pvc-600k Name: local-storage-class-waitforfirstconsumer-pvc-600k
Namespace: default
StorageClass: local-storage-class-waitforfirstconsumer
Status: Bound
Volume: local-storage-class-waitforfirstconsumer-pv-ubuntud
Labels: none
Annotations: pv.kubernetes.io/bind-completed: yespv.kubernetes.io/bound-by-controller: yes
Finalizers: [kubernetes.io/pvc-protection]
Capacity: 1Mi
Access Modes: RWO
VolumeMode: Filesystem
Used By: local-pv-app-waitforfirstconsumer-deployment-84449895c4-x7ddx
Events:Type Reason Age From Message---- ------ ---- ---- -------Normal WaitForFirstConsumer 2m23s (x16 over 6m2s) persistentvolume-controller waiting for first consumer to be created before binding这个Pod使用的PVC也被分配到ubuntud上。
参考资料
https://www.qikqiak.com/k8strain/storage/local/
