更新时间:2023-11-22 GMT+08:00
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HostPath转localDir、emptyDir或flexVolume

使用场景

在使用CCE或者其他K8s集群时,可以使用HostPath。由于CCI为共享集群,未开放HostPath能力,所以当使用HostPath的Pod想通过Virtual Kubelet弹到CCI时,会被vk-webhook拦截。如无法改变Pod spec.volumes中配置的HostPath,当前可通过配置Annotation的形式,允许让使用HostPath的Pod弹性到CCI上,但是VK在校验时需要去掉Pod中的HostPath或者将HostPath替换为localDir、emptyDir或者flexVolume。

通过在Pod.Annotations中加入注解可以做到HostPath转localDir、emptyDir或者flexVolume。

  • 单个HostPath替换为localDir配置方式:
    "coordinator.cci.io/hostpath-replacement": '[{"name":"source-hostpath-volume","policyType":"replaceByLocalDir","localDir":{"sizeLimit":"1Gi"}}]'
  • 单个HostPath替换为flexVolume配置方式:
     "coordinator.cci.io/hostpath-replacement": '[{"name":"source-hostpath-volume","policyType":"replaceByFlexVolume","flexVolume":{"driver": "huawei.com/fuxidisk", "fsType": "ext4", "options": {"volumeType": "sata", "volumeSize": "10Gi"}}}]'
    EVS目前支持普通、高I/O、超高I/O三种规格,volumeType根据实际情况填写:
    表1 EVS规格

    EVS规格

    类型

    适用场景

    普通I/O

    sata

    后端存储由SATA存储介质提供,适用于大容量,读写速率要求不高,事务性处理较少的应用场景,如:开发测试、企业办公应用。

    高I/O

    sas

    后端存储由SAS存储介质提供,适用于性能相对较高,读写速率要求高,有实时数据存储需求应用场景,如:创建文件系统、分布式文件共享。

    超高I/O

    ssd

    后端存储SSD存储介质提供,适用于高性能、高读写速率要求、数据密集型应用场景,如:NoSQL、关系型数据库、数据仓库(如Oracle RAC、SAP HANA)。

  • 全部hostPath都忽略:
     "coordinator.cci.io/hostpath-replacement": '[{"name":"*","policyType":"remove"}]'
  • 多个hostPath差异化替换策略:
    "coordinator.cci.io/hostpath-replacement": '[{"name":"source-hostpath-volume-1","policyType":"remove"},{"name":"source-hostpath-volume-2","policyType":"replaceByLocalDir","localDir":{"sizeLimit":"1Gi"}},{"name":"source-hostpath-volume-3","policyType":"replaceByEmptyDir","emptyDir":{"sizeLimit":"10Gi"}}]'

示例deployment:

apiVersion: apps/v1
 kind: Deployment
 metadata:
   annotations:
     description:''
   labels:
     virtual-kubelet.io/burst-to-cci: enforce
     appgroup:''
     version: v1
   name: test
   namespace: default
 spec:
   replicas:2
   selector:
     matchLabels:
       app: test
       version: v1
   template:
     metadata:
       labels:
         app: test
         version: v1
       annotations:
         coordinator.cci.io/hostpath-replacement:'[{"name": "test-log2", "policyType": "remove"}, {"name": "test-log", "policyType": "replaceByEmptyDir", "emptyDir":{"sizeLimit":"10Gi"}}, {"name": "test-log1", "policyType": "replaceByLocalDir", "localDir":{"sizeLimit":"1Gi"}}]'
     spec:
       containers:
         -name: container-1
           image: nginx
           imagePullPolicy: IfNotPresent
           env:
             -name: PAAS_APP_NAME
               value: test
             -name: PAAS_NAMESPACE
               value: default
             -name: PAAS_PROJECT_ID
               value: 0b52a6e40b00d3682f36c0005163a82c
           resources:
             requests:
               cpu: 250m
               memory: 512Mi
             limits:
               cpu: 250m
               memory: 512Mi
           volumeMounts:
             -name: test-log
               mountPath: /tmp/log
             -name: test-log1
               mountPath: /tmp/log1
             -name: test-log2
               mountPath: /tmp/log2
       volumes:
       -hostPath:
           path: /var/paas/sys/log/virtual-kubelet
           type:""
         name: test-log
       -hostPath:
           path: /var/paas/sys/log
           type:""
         name: test-log1
       -hostPath:
           path: /var/paas/sys/log2
           type:""
         name: test-log2

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