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28.2.6. 创建额外 Pod 以引用 Same PVC

28.2.6. 创建额外 Pod 以引用 Same PVC

此 pod 定义在同一命名空间中创建，使用不同的容器。但是，您可以通过在下面的 volumes 部分中指定声明名称来使用相同的后备存储：

例 28.4. Pod 对象定义

apiVersion: v1
kind: Pod
metadata:
  name: busybox-nfs-pod 
  labels:
    name: busybox-nfs-pod
spec:
  containers:
  - name: busybox-nfs-pod
    image: busybox 
    command: ["sleep", "60000"]
    volumeMounts:
    - name: nfsvol-2 
      mountPath: /usr/share/busybox  
      readOnly: false
  securityContext:
    supplementalGroups: [100003] 
    privileged: false
  volumes:
  - name: nfsvol-2
    persistentVolumeClaim:
      claimName: nfs-pvc

apiVersion: v1
kind: Pod
metadata:
  name: busybox-nfs-pod


  labels:
    name: busybox-nfs-pod
spec:
  containers:
  - name: busybox-nfs-pod
    image: busybox


    command: ["sleep", "60000"]
    volumeMounts:
    - name: nfsvol-2


      mountPath: /usr/share/busybox


      readOnly: false
  securityContext:
    supplementalGroups: [100003]


    privileged: false
  volumes:
  - name: nfsvol-2
    persistentVolumeClaim:
      claimName: nfs-pvc

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1: oc get pod 显示此 pod 的名称。
2: 此 pod 运行的镜像。
3: 卷的名称。在 containers 和 volumes 部分中，此名称必须相同。
4: 如容器所示的挂载路径。
5: 要分配给容器的组 ID。
6: 之前创建的 PVC 也被不同的容器使用。

将 pod 定义保存到文件中，如 nfs-2.yaml，并创建 pod：

oc create -f nfs-2.yaml

# oc create -f nfs-2.yaml
pod "busybox-nfs-pod" created

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验证 pod 是否已创建：

oc get pods

# oc get pods
NAME                READY     STATUS    RESTARTS   AGE
busybox-nfs-pod     1/1       Running   0          3s

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oc describe pod 命令中显示更多详细信息：

oc describe pod busybox-nfs-pod

[root@ose70 nfs]# oc describe pod busybox-nfs-pod
Name:				busybox-nfs-pod
Namespace:			default
Image(s):			busybox
Node:				ose70.rh7/192.168.234.148
Start Time:			Mon, 21 Mar 2016 10:19:46 -0400
Labels:				name=busybox-nfs-pod
Status:				Running
Reason:
Message:
IP:				10.1.0.5
Replication Controllers:	<none>
Containers:
  busybox-nfs-pod:
    Container ID:	docker://346d432e5a4824ebf5a47fceb4247e0568ecc64eadcc160e9bab481aecfb0594
    Image:		busybox
    Image ID:		docker://17583c7dd0dae6244203b8029733bdb7d17fccbb2b5d93e2b24cf48b8bfd06e2
    QoS Tier:
      cpu:		BestEffort
      memory:		BestEffort
    State:		Running
      Started:		Mon, 21 Mar 2016 10:19:48 -0400
    Ready:		True
    Restart Count:	0
    Environment Variables:
Conditions:
  Type		Status
  Ready 	True
Volumes:
  nfsvol-2:
    Type:	PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
    ClaimName:	nfs-pvc
    ReadOnly:	false
  default-token-32d2z:
    Type:	Secret (a secret that should populate this volume)
    SecretName:	default-token-32d2z
Events:
  FirstSeen	LastSeen	Count	From			SubobjectPath				Reason		Message
  ─────────	────────	─────	────			─────────────				──────		───────
  4m		4m		1	{scheduler }							Scheduled	Successfully assigned busybox-nfs-pod to ose70.rh7
  4m		4m		1	{kubelet ose70.rh7}	implicitly required container POD	Pulled		Container image "openshift3/ose-pod:v3.1.0.4" already present on machine
  4m		4m		1	{kubelet ose70.rh7}	implicitly required container POD	Created		Created with docker id 249b7d7519b1
  4m		4m		1	{kubelet ose70.rh7}	implicitly required container POD	Started		Started with docker id 249b7d7519b1
  4m		4m		1	{kubelet ose70.rh7}	spec.containers{busybox-nfs-pod}	Pulled		Container image "busybox" already present on machine
  4m		4m		1	{kubelet ose70.rh7}	spec.containers{busybox-nfs-pod}	Created		Created with docker id 346d432e5a48
  4m		4m		1	{kubelet ose70.rh7}	spec.containers{busybox-nfs-pod}	Started		Started with docker id 346d432e5a48

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如您所见，两个容器都使用附加到后端上同一 NFS 挂载的相同存储声明。

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28.2.6. 创建额外 Pod 以引用 Same PVC

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