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    TEXT_CATEGORIES Docker
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    示例：

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    TEXT_CATEGORIES Kubernetes
    点击数：243

    使用kubectl查看kubernetes集群信息：

    [root@notepad bin]# kubectl cluster-info
Kubernetes master is running at https://192.168.99.101:8443
KubeDNS is running at https://192.168.99.101:8443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
[root@notepad bin]#
    TEXT_CATEGORIES Kubernetes
    点击数：213

    pv yaml文件示例：

    [root@kvm147 kevin]# cat zk-persistent-volume.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: zk0
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 10.0.0.227
    path: /mnt/227nfs/zk0
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: zk1
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 10.0.0.227
    path: /mnt/227nfs/zk1
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: zk2
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 10.0.0.227
    path: /mnt/227nfs/zk2
[root@kvm147 kevin]#

    zookeeper yaml文件示例：

    [root@kvm147 kevin]# cat zookeeper.yaml
apiVersion: v1
kind: Service
metadata:
  name: zk-hs
  labels:
    app: zk
spec:
  ports:
  - port: 2888
    name: server
  - port: 3888
    name: leader-election
  clusterIP: None
  selector:
    app: zk
---
apiVersion: v1
kind: Service
metadata:
  name: zk-cs
  labels:
    app: zk
spec:
  type: NodePort
  ports:
  - port: 2181
    targetPort: 2181
    name: client
    nodePort: 30181
  selector:
    app: zk
---
apiVersion: policy/v1beta1
kind: PodDisruptionBudget
metadata:
  name: zk-pdb
spec:
  selector:
    matchLabels:
      app: zk
  maxUnavailable: 1
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: zk
spec:
  serviceName: zk-hs
  replicas: 3
  selector:
    matchLabels:
      app: zk
  template:
    metadata:
      labels:
        app: zk
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: "app"
                    operator: In
                    values:
                    - zk
              topologyKey: "kubernetes.io/hostname"
      containers:
      - name: kubernetes-zookeeper
        imagePullPolicy: Always
        image: registry.cn-shenzhen.aliyuncs.com/cj-public/kubernetes-zookeeper:1.0-3.4.10
        resources:
          requests:
            memory: "1Gi"
            cpu: "0.5"
        ports:
        - containerPort: 2181
          name: client
        - containerPort: 2888
          name: server
        - containerPort: 3888
          name: leader-election
        command:
        - sh
        - -c
        - "start-zookeeper \
          --servers=3 \
          --data_dir=/var/lib/zookeeper/data \
          --data_log_dir=/var/lib/zookeeper/data/log \
          --conf_dir=/opt/zookeeper/conf \
          --client_port=2181 \
          --election_port=3888 \
          --server_port=2888 \
          --tick_time=2000 \
          --init_limit=10 \
          --sync_limit=5 \
          --heap=512M \
          --max_client_cnxns=60 \
          --snap_retain_count=3 \
          --purge_interval=12 \
          --max_session_timeout=40000 \
          --min_session_timeout=4000 \
          --log_level=INFO"
        readinessProbe:
          exec:
            command:
            - sh
            - -c
            - "zookeeper-ready 2181"
          initialDelaySeconds: 10
          timeoutSeconds: 5
        livenessProbe:
          exec:
            command:
            - sh
            - -c
            - "zookeeper-ready 2181"
          initialDelaySeconds: 10
          timeoutSeconds: 5
        volumeMounts:
        - name: datadir
          mountPath: /var/lib/zookeeper
  volumeClaimTemplates:
  - metadata:
      name: datadir
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 10Gi
[root@kvm147 kevin]#

    备注：kubernetes-zookeeper镜像是从官网pull下来，然后推送到自己的镜像仓库的，所以kubernetes-zookeeper镜像本身应该没有问题；

    docker版本：

    [root@kvm147 kevin]# docker version
Client: Docker Engine - Community
 Version:           19.03.1
 API version:       1.40
 Go version:        go1.12.5
 Git commit:        74b1e89
 Built:             Thu Jul 25 21:21:07 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.1
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.12.5
  Git commit:       74b1e89
  Built:            Thu Jul 25 21:19:36 2019
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.2.6
  GitCommit:        894b81a4b802e4eb2a91d1ce216b8817763c29fb
 runc:
  Version:          1.0.0-rc8
  GitCommit:        425e105d5a03fabd737a126ad93d62a9eeede87f
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683
[root@kvm147 kevin]#

    宿主机OS版本：

    [root@kvm147 kevin]# cat /etc/redhat-release 
CentOS Linux release 7.6.1810 (Core) 
[root@kvm147 kevin]# uname -a
Linux kvm147 3.10.0-957.12.2.el7.x86_64 #1 SMP Tue May 14 21:24:32 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
[root@kvm147 kevin]#

    kubernetes版本：

    [root@kvm147 kevin]# kubectl version --short
Client Version: v1.15.3
Server Version: v1.15.3
[root@kvm147 kevin]#

     

    部署zk时，报错如下：

    [root@kvm147 kevin]# kubectl describe pod zk-0
Name:           zk-0
Namespace:      default
Priority:       0
Node:           kvm227/10.0.0.227
Start Time:     Mon, 23 Sep 2019 19:10:32 +0800
Labels:         app=zk
                controller-revision-hash=zk-5c449bf954
                statefulset.kubernetes.io/pod-name=zk-0
Annotations:    <none>
Status:         Running
IP:             10.244.1.218
Controlled By:  StatefulSet/zk
Containers:
  kubernetes-zookeeper:
    Container ID:  docker://4be7a7f44f9f5b9fef77aec895815263f8bc249052f0ea078579035196ae52fe
    Image:         registry.cn-shenzhen.aliyuncs.com/cj-public/kubernetes-zookeeper:1.0-3.4.10
    Image ID:      docker-pullable://registry.cn-shenzhen.aliyuncs.com/cj-public/kubernetes-zookeeper@sha256:647acb0cbe6763240d412cd6d18957f440ac58bc2846474c1605afd81b6dcbdb
    Ports:         2181/TCP, 2888/TCP, 3888/TCP
    Host Ports:    0/TCP, 0/TCP, 0/TCP
    Command:
      sh
      -c
      start-zookeeper --servers=3 --data_dir=/var/lib/zookeeper/data --data_log_dir=/var/lib/zookeeper/data/log --conf_dir=/opt/zookeeper/conf --client_port=2181 --election_port=3888 --server_port=2888 --tick_time=2000 --init_limit=10 --sync_limit=5 --heap=512M --max_client_cnxns=60 --snap_retain_count=3 --purge_interval=12 --max_session_timeout=40000 --min_session_timeout=4000 --log_level=INFO
    State:          Waiting
      Reason:       CrashLoopBackOff
    Last State:     Terminated
      Reason:       ContainerCannotRun
      Message:      OCI runtime create failed: container_linux.go:345: starting container process caused "exec: \"sh\": executable file not found in $PATH": unknown
      Exit Code:    127
      Started:      Mon, 23 Sep 2019 19:26:42 +0800
      Finished:     Mon, 23 Sep 2019 19:26:42 +0800
    Ready:          False
    Restart Count:  8
    Requests:
      cpu:        500m
      memory:     1Gi
    Liveness:     exec [sh -c zookeeper-ready 2181] delay=10s timeout=5s period=10s #success=1 #failure=3
    Readiness:    exec [sh -c zookeeper-ready 2181] delay=10s timeout=5s period=10s #success=1 #failure=3
    Environment:  <none>
    Mounts:
      /var/lib/zookeeper from datadir (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-fhg2t (ro)
Conditions:
  Type              Status
  Initialized       True 
  Ready             False 
  ContainersReady   False 
  PodScheduled      True 
Volumes:
  datadir:
    Type:       PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
    ClaimName:  datadir-zk-0
    ReadOnly:   false
  default-token-fhg2t:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-fhg2t
    Optional:    false
QoS Class:       Burstable
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason     Age                 From               Message
  ----     ------     ----                ----               -------
  Normal   Scheduled  16m                 default-scheduler  Successfully assigned default/zk-0 to kvm227
  Normal   Pulling    15m (x4 over 16m)   kubelet, kvm227    Pulling image "registry.cn-shenzhen.aliyuncs.com/cj-public/kubernetes-zookeeper:1.0-3.4.10"
  Normal   Pulled     15m (x4 over 16m)   kubelet, kvm227    Successfully pulled image "registry.cn-shenzhen.aliyuncs.com/cj-public/kubernetes-zookeeper:1.0-3.4.10"
  Normal   Created    15m (x4 over 16m)   kubelet, kvm227    Created container kubernetes-zookeeper
  Warning  Failed     15m (x4 over 16m)   kubelet, kvm227    Error: failed to start container "kubernetes-zookeeper": Error response from daemon: OCI runtime create failed: container_linux.go:345: starting container process caused "exec: \"sh\": executable file not found in $PATH": unknown
  Warning  BackOff    81s (x71 over 16m)  kubelet, kvm227    Back-off restarting failed container
[root@kvm147 kevin]#

     分析：docker版本的兼容性引起的吗？

    【解决思路与方法】：从官网拉取kubernetes-zookeeper:1.0-3.4.10后，直接再tag一下，image id不变，然后推送到自己的仓库中；如此，从自己的仓库拉取这个kubernetes:1.0-3.4.10时，起pod时就不会报错；

    【禁忌】：把官网kubernetes-zookeeper:1.0-3.4.10拉下来后，利用docker save保存，然后再推进自己的镜像仓库，这种情况下，image id已经改变了，使用这个镜像起pod时，会报如上所述的错。

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