![]() ![]() Below is the log message from /var/log/message, it can see that this issue is cause by the threshold of ephemeral storage was being hit: All pods goes to “evicted” or “pending” state and require to start all pods manually in order to resume. The cluster somehow evicted my application’s pods due to ephemeral storage. I would like to ask is there any way to avoid this issue or workaround provided by Kubernetes itself? I have set up my private Kubernetes cluster earlier this year, it was stable until a month ago I have encountered the ephemeral storage issue. If there is a PersistentVolume (PV) that satisfies the specified requirements in the PersistentVolumeClaim (PVC), it will be bound to the PVC before the Pod starts.Cloud being used: (put bare-metal if not on a public cloud) private For example, a Pod may need a volume that is at least 4Gi large or a volume mounted under /data in the container’s filesystem. A PersistentVolumeClaim can request specific size and Access Modes (for example, they can be mounted once read/write or many times read-only).Īny workload can specify a PersistentVolumeClaim. For a workload that requires persistent volumes, the workload should use PersistentVolumeClaim (PVC) to express its request on persistent storage. Create a Persistent Volume to access your NFS shared storageĪ PersistentVolumeClaim is a request for storage.In order to use a Persistent Volume (PV), your application needs to invoke a Persistent Volume Claim (PVC). The Persistent Volume API objects capture the details of the implementation of the storage, be that NFS, iSCSI, or a cloud-provider-specific storage system. ![]() Unlike ephemeral storage, the lifecycle of a PersistentVolume is independent of that of the workload that uses it. Persistent Volumes are resources that represent storage in the cluster that has been provisioned by an administrator or dynamically provisioned using Storage Classes. For those cases, the workloads need to use PersistentVolumes (PV). For instance, a database server needs to recover database files after it crashes. You may have stateful workloads requiring persistent storage whose lifecycle is longer than that of Pods or containers. Persistent Volumes are volume plug-ins that have lifecycle capabilities that are independent of any Kubernetes Pod or Deployment. Persistent Volumes are storage resources that can be used by the cluster. You may need to express the capacity requests for ephemeral storage so that kubelet can use that information to make sure it does not run out of ephemeral storage space on each node. Managed by container runtime (e.g., under /var/lib/containerd).Įphemeral storage is automatically managed by Kubernetes, and typically does not require explicit settings. Managed by kubelet under /var/lib/kubelet. For example, the following are examples of ephemeral storage provided by Kubernetes: EmptyDir volume. This document describes the model used in Kubernetes for managing persistent, cluster-scoped storage for workloads requiring access to persistent data.Ī workload on Kubernetes typically requires two types of storage:Įphemeral storage, by its name, is ephemeral in the sense that it is cleaned up when the workload is deleted or the container crashes.
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