docker - 将持久卷声明添加到容器中的现有文件
问题描述
在我的 docker 映像中,我有一个/opt/myapp/etc
包含一些文件和目录的目录。我想为我的应用创建 statefulset。在那个 statefulset 中,我正在创建持久卷声明并附加到/opt/myapp/etc
. Statefulsetyaml
附在下面。谁能告诉我在这种情况下如何将卷附加到容器?
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: statefulset
labels:
app: myapp
spec:
serviceName: myapp
replicas: 1
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
spec:
containers:
- image: 10.1.23.5:5000/redis
name: redis
ports:
- containerPort: 6379
name: redis-port
- image: 10.1.23.5:5000/myapp:18.1
name: myapp
ports:
- containerPort: 8181
name: port
volumeMounts:
- name: data
mountPath: /opt/myapp/etc
volumeClaimTemplates:
- metadata:
name: data
spec:
accessModes: [ "ReadWriteOnce" ]
storageClassName: standard
resources:
requests:
storage: 5Gi
这是描述 pod 的输出
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning FailedScheduling 3m (x4 over 3m) default-scheduler pod has unbound PersistentVolumeClaims
Normal Scheduled 3m default-scheduler Successfully assigned controller-statefulset-0 to dev-k8s-2
Normal SuccessfulMountVolume 3m kubelet, dev-k8s-2 MountVolume.SetUp succeeded for volume "default-token-xpskd"
Normal SuccessfulAttachVolume 3m attachdetach-controller AttachVolume.Attach succeeded for volume "pvc-77d2cef8-a674-11e8-9358-fa163e3294c1"
Normal SuccessfulMountVolume 3m kubelet, dev-k8s-2 MountVolume.SetUp succeeded for volume "pvc-77d2cef8-a674-11e8-9358-fa163e3294c1"
Normal Pulling 2m kubelet, dev-k8s-2 pulling image "10.1.23.5:5000/redis"
Normal Pulled 2m kubelet, dev-k8s-2 Successfully pulled image "10.1.23.5:5000/redis"
Normal Created 2m kubelet, dev-k8s-2 Created container
Normal Started 2m kubelet, dev-k8s-2 Started container
Normal Pulled 1m (x4 over 2m) kubelet, dev-k8s-2 Container image "10.1.23.5:5000/myapp:18.1" already present on machine
Normal Created 1m (x4 over 2m) kubelet, dev-k8s-2 Created container
Normal Started 1m (x4 over 2m) kubelet, dev-k8s-2 Started container
Warning BackOff 1m (x7 over 2m) kubelet, dev-k8s-2 Back-off restarting failed container
存储类定义
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
name: standard
namespace: controller
provisioner: kubernetes.io/cinder
reclaimPolicy: Retain
parameters:
availability: nova
解决方案
检查您的集群中是否定义了存储类。
kubectl get storageclass
如果您使用默认存储类作为主机路径(在 minikube 的情况下),那么您不需要在模板中包含存储类。
volumeClaimTemplates:
- metadata:
name: data
spec:
accessModes: [ "ReadWriteOnce" ]
resources:
requests:
storage: 5Gi
通过不指定存储类,k8s 将继续并使用默认存储类调度持久卷,在 minikube 的情况下为 host-path 还确保/opt/myapp/etc
存在于要调度 pod 的节点上。
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