在状态集pod中使用本地持久卷时出错

Question

我正在尝试使用https://kubernetes.io/blog/2018/04/13/local-persistent-volumes-beta/中提到的本地持久性卷来创建状态集荚。但当我的吊舱试图索取音量时。我收到以下错误：

Events:
  Type     Reason            Age                 From               Message
  ----     ------            ----                ----               -------
  Warning  FailedScheduling  4s (x243 over 20m)  default-scheduler  0/2 nodes are available: 1 node(s) didn't find available persistent volumes to bind, 1 node(s) had taints that the pod didn't tolerate.

下面是我创建的存储类和持久卷：

storageclass-kafka-broker.yml

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: kafka-broker
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer

storageclass-kafka-zookeeper.yml

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: kafka-zookeeper
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer

pv-zookeeper.yml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: example-local-pv-zookeeper
spec:
  capacity:
    storage: 2Gi
  accessModes:
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: kafka-zookeeper
  local:
    path: /D/kubernetes-mount-path
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - my-node

pv-kafka.yml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: example-local-pv
spec:
  capacity:
    storage: 200Gi
  accessModes:
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: kafka-broker
  local:
    path: /D/kubernetes-mount-path
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - my-node

下面是使用此卷的pod 50pzoo.yml：

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: pzoo
  namespace: kafka
spec:
  selector:
    matchLabels:
      app: zookeeper
      storage: persistent
  serviceName: "pzoo"
  replicas: 1
  updateStrategy:
    type: OnDelete
  template:
    metadata:
      labels:
        app: zookeeper
        storage: persistent
      annotations:
    spec:
      terminationGracePeriodSeconds: 10
      initContainers:
      - name: init-config
        image: solsson/kafka-initutils@sha256:18bf01c2c756b550103a99b3c14f741acccea106072cd37155c6d24be4edd6e2
        command: ['/bin/bash', '/etc/kafka-configmap/init.sh']
        volumeMounts:
        - name: configmap
          mountPath: /etc/kafka-configmap
        - name: config
          mountPath: /etc/kafka
        - name: data
          mountPath: /var/lib/zookeeper/data
      containers:
      - name: zookeeper
        image: solsson/kafka:2.0.0@sha256:8bc5ccb5a63fdfb977c1e207292b72b34370d2c9fe023bdc0f8ce0d8e0da1670
        env:
        - name: KAFKA_LOG4J_OPTS
          value: -Dlog4j.configuration=file:/etc/kafka/log4j.properties
        command:
        - ./bin/zookeeper-server-start.sh
        - /etc/kafka/zookeeper.properties
        ports:
        - containerPort: 2181
          name: client
        - containerPort: 2888
          name: peer
        - containerPort: 3888
          name: leader-election
        resources:
          requests:
            cpu: 10m
            memory: 100Mi
        readinessProbe:
          exec:
            command:
            - /bin/sh
            - -c
            - '[ "imok" = "$(echo ruok | nc -w 1 -q 1 127.0.0.1 2181)" ]'
        volumeMounts:
        - name: config
          mountPath: /etc/kafka
        - name: data
          mountPath: /var/lib/zookeeper/data
      volumes:
      - name: configmap
        configMap:
          name: zookeeper-config
      - name: config
        emptyDir: {}
  volumeClaimTemplates:
  - metadata:
      name: data
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: kafka-zookeeper
      resources:
        requests:
          storage: 1Gi

下面是kubectl get events命令输出

[root@quagga kafka-kubernetes-testing-single-node]# kubectl get events --namespace kafka
LAST SEEN   FIRST SEEN   COUNT     NAME                           KIND                    SUBOBJECT   TYPE      REASON                 SOURCE                        MESSAGE
1m          1m           1         pzoo.15517ca82c7a4675          StatefulSet                         Normal    SuccessfulCreate       statefulset-controller        create Claim data-pzoo-0 Pod pzoo-0 in StatefulSet pzoo success
1m          1m           1         pzoo.15517ca82caed9bc          StatefulSet                         Normal    SuccessfulCreate       statefulset-controller        create Pod pzoo-0 in StatefulSet pzoo successful
13s         1m           9         data-pzoo-0.15517ca82c726833   PersistentVolumeClaim               Normal    WaitForFirstConsumer   persistentvolume-controller   waiting for first consumer to be created before binding
9s          1m           22        pzoo-0.15517ca82cb90238        Pod                                 Warning   FailedScheduling       default-scheduler             0/2 nodes are available: 1 node(s) didn't find available persistent volumes to bind, 1 node(s) had taints that the pod didn't tolerate.

kubectl get pv的输出是：

[root@quagga kafka-kubernetes-testing-single-node]# kubectl get pv
NAME                         CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM     STORAGECLASS      REASON    AGE
example-local-pv             200Gi      RWO            Retain           Available             kafka-broker                4m
example-local-pv-zookeeper   2Gi        RWO            Retain           Available             kafka-zookeeper             4m

Answer 1

这是个愚蠢的错误。我在my-node文件中的节点名值中提到了pv。修改它以纠正节点名解决了我的问题。

Answer 2

感谢您的分享！我也犯了同样的错误。我想k8s文档可以更清楚地说明这一点(尽管它非常明显)，所以它是一个复制粘贴陷阱。

更清楚的是:如果您有一个具有3个节点的集群，那么您需要创建三个不同的命名PV，并为'my-node‘(kubectl get节点)提供正确的节点名。volumeClaimTemplate和PV之间的唯一引用是存储类的名称。

我把类似于“本地- PV -节点-X”之类的东西作为PV名称，所以当我查看kubernetes仪表板中的PV部分时，我可以直接看到这个卷所在的位置。

你用“我的笔记”上的提示更新你的清单;-)