如何将 SQLite 数据库放置在 NFS 持久卷之外

Question

我在裸机上有一个多节点 (2) Kubernetes 集群运行ning。我知道 1. hostPath 不利于生产，2. 多节点设置不支持 hostPath 持久卷。有没有一种方法可以安全地运行由 SQLite 数据库支持的应用程序？在 NFS 上，数据库锁定很多，确实会损害应用程序的性能。

我可能会将每个应用程序的 SQLite 数据库放在 hostPath 卷上，然后一切都会再次运行顺利进行。但我想知道是否有一些解决方法可以实现这一点，即使我必须将应用程序限制到特定节点。

Answer 1

您似乎应该使用 Local Persistent Volumes GA.

根据文档：

A local volume represents a mounted local storage device such as a disk, partition or directory.

Compared to hostPath volumes, local volumes can be used in a durable and portable manner without manually scheduling Pods to nodes, as the system is aware of the volume’s node constraints by looking at the node affinity on the PersistentVolume.

但是：

At GA, Local Persistent Volumes do not support dynamic volume provisioning.

您可以找到更多信息 here, and here。

举个例子：

apiVersion: v1
kind: PersistentVolume
metadata:
  name: example-pv
spec:
  capacity:
    storage: 100Gi
  # volumeMode field requires BlockVolume Alpha feature gate to be enabled.
  volumeMode: Filesystem
  accessModes:
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Delete
  storageClassName: local-storage
  local:
    path: /mnt/disks/ssd1
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - example-node

With Local Persistent Volumes, the Kubernetes scheduler ensures that a pod using a Local Persistent Volume is always scheduled to the same node

如何将 SQLite 数据库放置在 NFS 持久卷之外

How to place SQLite database outside of NFS Persistent Volume

sqlite

nfs

kubernetes

persistent-volumes