redis - DigitalOcean pod 具有未绑定(bind)的即时 PersistentVolumeClaims

Question

我正在尝试在 DigitalOcean 的 Kubernetes 中运行 Redis 集群。作为一个 poc，我只是尝试运行我在网上找到的一个示例 ( https://github.com/sanderploegsma/redis-cluster/blob/master/redis-cluster.yml )，它能够在使用 minikube 在本地运行时适本地启动 pod。

但是，在Digital Ocean上运行时，总是报如下错误:

Warning FailedScheduling 3s (x8 over 17s) default-scheduler pod has unbound immediate PersistentVolumeClaims (repeated 4 times)

鉴于我没有改变任何东西，我不确定为什么这行不通。有人有什么建议吗？

编辑:一些额外的信息

$ kubectl describe pvc  
Name:          data-redis-cluster-0
Namespace:     default
StorageClass:  
Status:        Pending
Volume:        
Labels:        app=redis-cluster
Annotations:   <none>
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:      
Access Modes:  
Events:
  Type       Reason         Age                     From                         Message
  ----       ------         ----                    ----                         -------
  Normal     FailedBinding  3m19s (x3420 over 14h)  persistentvolume-controller  no persistent volumes available for this claim and no storage class is set
Mounted By:  <none>

编辑:设置默认存储类部分解决了问题!但是，该节点现在无法找到要绑定(bind)的可用卷:

kubectl 描述 pvc:

Name:          data-redis-cluster-0
Namespace:     default
StorageClass:  local-storage
Status:        Pending
Volume:        
Labels:        app=redis-cluster
Annotations:   <none>
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:      
Access Modes:  
Events:
  Type       Reason                Age                     From                         Message
  ----       ------                ----                    ----                         -------
  Normal     WaitForFirstConsumer  12m (x9 over 13m)       persistentvolume-controller  waiting for first consumer to be created before binding
  Normal     WaitForFirstConsumer  3m19s (x26 over 9m34s)  persistentvolume-controller  waiting for first consumer to be created before binding

kubectl 描述 pod redis-cluster-0

....
Events:
  Type     Reason            Age                  From               Message
  ----     ------            ----                 ----               -------
  Warning  FailedScheduling  16m (x25 over 17m)   default-scheduler  0/5 nodes are available: 1 node(s) had taints that the pod didn't tolerate, 4 node(s) didn't find available persistent volumes to bind.

kubectl 描述 sc

Name:                  local-storage
IsDefaultClass:        Yes
Annotations:           storageclass.kubernetes.io/is-default-class=true
Provisioner:           kubernetes.io/no-provisioner
Parameters:            <none>
AllowVolumeExpansion:  <unset>
MountOptions:          <none>
ReclaimPolicy:         Delete
VolumeBindingMode:     WaitForFirstConsumer
Events:                <none>

kubernetes 管理器 pod 日志:

I1028 15:30:56.154131       1 event.go:221] Event(v1.ObjectReference{Kind:"StatefulSet", Namespace:"default", Name:"redis-cluster", UID:"7528483e-dac6-11e8-871f-2e55450d570e", APIVersion:"apps/v1", ResourceVersion:"2588806", FieldPath:""}): type: 'Normal' reason: 'SuccessfulCreate' create Claim data-redis-cluster-0 Pod redis-cluster-0 in StatefulSet redis-cluster success
I1028 15:30:56.166649       1 event.go:221] Event(v1.ObjectReference{Kind:"PersistentVolumeClaim", Namespace:"default", Name:"data-redis-cluster-0", UID:"76746506-dac6-11e8-871f-2e55450d570e", APIVersion:"v1", ResourceVersion:"2588816", FieldPath:""}): type: 'Normal' reason: 'WaitForFirstConsumer' waiting for first consumer to be created before binding
I1028 15:30:56.220464       1 event.go:221] Event(v1.ObjectReference{Kind:"StatefulSet", Namespace:"default", Name:"redis-cluster", UID:"7528483e-dac6-11e8-871f-2e55450d570e", APIVersion:"apps/v1", ResourceVersion:"2588806", FieldPath:""}): type: 'Normal' reason: 'SuccessfulCreate' create Pod redis-cluster-0 in StatefulSet redis-cluster successful
I1028 15:30:57.004631       1 event.go:221] Event(v1.ObjectReference{Kind:"PersistentVolumeClaim", Namespace:"default", Name:"data-redis-cluster-0", UID:"76746506-dac6-11e8-871f-2e55450d570e", APIVersion:"v1", ResourceVersion:"2588825", FieldPath:""}): type: 'Normal' reason: 'WaitForFirstConsumer' waiting for first consumer to be created before binding

Answer 1

这个:

no storage class is set

kubectl describe sc 的空输出意味着没有存储类。

我建议安装 CSI-driver对于 digital ocean 。这将使用 Kubernetes CSI 接口(interface)创建一个 do-block-storage 类。

另一种选择是使用本地存储。使用 local存储类:

$ cat <<EOF
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer
EOF | kubectl apply -f -

然后对于任何一种情况，如果您没有在 PVC 中指定 storageClassName，您可能需要将其设置为默认存储类:

$ kubectl patch storageclass local-storage -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

或

$ kubectl patch storageclass do-block-storage -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'