Kubernetes进阶实战读书笔记：存储卷概述

一、Kubernetes 支持的存储类型

1、从官方手册查看

[root@master ~]# kubectl explain pod.spec.volumes
KIND: Pod
VERSION: v1

RESOURCE: volumes <[]Object>

DESCRIPTION:
List of volumes that can be mounted by containers belonging to the pod.
More info: https://kubernetes.io/docs/concepts/storage/volumes

Volume represents a named volume in a pod that may be accessed by any
container in the pod.

FIELDS:
awsElasticBlockStore <Object>
AWSElasticBlockStore represents an AWS Disk resource that is attached to a
kubelet's host machine and then exposed to the pod. More info:
https://kubernetes.io/docs/concepts/storage/volumes#awselasticblockstore

azureDisk <Object>
AzureDisk represents an Azure Data Disk mount on the host and bind mount to
the pod.

azureFile <Object>
AzureFile represents an Azure File Service mount on the host and bind mount
to the pod.

cephfs <Object>
CephFS represents a Ceph FS mount on the host that shares a pod's lifetime

cinder <Object>
Cinder represents a cinder volume attached and mounted on kubelets host
machine. More info: https://examples.k8s.io/mysql-cinder-pd/README.md

configMap <Object>
ConfigMap represents a configMap that should populate this volume

csi <Object>
CSI (Container Storage Interface) represents storage that is handled by an
external CSI driver (Alpha feature).

downwardAPI <Object>
DownwardAPI represents downward API about the pod that should populate this
volume

emptyDir <Object>
EmptyDir represents a temporary directory that shares a pod's lifetime.
More info: https://kubernetes.io/docs/concepts/storage/volumes#emptydir

fc <Object>
FC represents a Fibre Channel resource that is attached to a kubelet's host
machine and then exposed to the pod.

flexVolume <Object>
FlexVolume represents a generic volume resource that is
provisioned/attached using an exec based plugin.

flocker <Object>
Flocker represents a Flocker volume attached to a kubelet's host machine.
This depends on the Flocker control service being running

gcePersistentDisk <Object>
GCEPersistentDisk represents a GCE Disk resource that is attached to a
kubelet's host machine and then exposed to the pod. More info:
https://kubernetes.io/docs/concepts/storage/volumes#gcepersistentdisk

gitRepo <Object>
GitRepo represents a git repository at a particular revision. DEPRECATED:
GitRepo is deprecated. To provision a container with a git repo, mount an
EmptyDir into an InitContainer that clones the repo using git, then mount
the EmptyDir into the Pod's container.

glusterfs <Object>
Glusterfs represents a Glusterfs mount on the host that shares a pod's
lifetime. More info: https://examples.k8s.io/volumes/glusterfs/README.md

hostPath <Object>
HostPath represents a pre-existing file or directory on the host machine
that is directly exposed to the container. This is generally used for
system agents or other privileged things that are allowed to see the host
machine. Most containers will NOT need this. More info:
https://kubernetes.io/docs/concepts/storage/volumes#hostpath

iscsi <Object>
ISCSI represents an ISCSI Disk resource that is attached to a kubelet's
host machine and then exposed to the pod. More info:
https://examples.k8s.io/volumes/iscsi/README.md

name <string> -required-
Volume's name. Must be a DNS_LABEL and unique within the pod. More info:
https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names

nfs <Object>
NFS represents an NFS mount on the host that shares a pod's lifetime More
info: https://kubernetes.io/docs/concepts/storage/volumes#nfs

persistentVolumeClaim <Object>
PersistentVolumeClaimVolumeSource represents a reference to a
PersistentVolumeClaim in the same namespace. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#persistentvolumeclaims

photonPersistentDisk <Object>
PhotonPersistentDisk represents a PhotonController persistent disk attached
and mounted on kubelets host machine

portworxVolume <Object>
PortworxVolume represents a portworx volume attached and mounted on
kubelets host machine

projected <Object>
Items for all in one resources secrets, configmaps, and downward API

quobyte <Object>
Quobyte represents a Quobyte mount on the host that shares a pod's lifetime

rbd <Object>
RBD represents a Rados Block Device mount on the host that shares a pod's
lifetime. More info: https://examples.k8s.io/volumes/rbd/README.md

scaleIO <Object>
ScaleIO represents a ScaleIO persistent volume attached and mounted on
Kubernetes nodes.

secret <Object>
Secret represents a secret that should populate this volume. More info:
https://kubernetes.io/docs/concepts/storage/volumes#secret

storageos <Object>
StorageOS represents a StorageOS volume attached and mounted on Kubernetes
nodes.

vsphereVolume <Object>
VsphereVolume represents a vSphere volume attached and mounted on kubelets
host machine

2、重点关注

二、存储卷的使用方式

1、存储卷的配置组成

pod.spec.volumes字段定义在pod之上的存储卷列表、其支持使用多种不同类型的存储卷且配置参数差别很大
pod.spec.containers.volumeMounts字段在容器上定义的存储卷挂在列表、它只能挂在当前pod资源中定义的具体存储卷、当然、也可以不挂在任何存储卷

2、示例文档

apiVersion: v1
kind: Pod
metadata:
  name: vol-emptydir-pod
spec:
  volumes:
  - name: html
    emptyDir: {}
  containers:
  - name: nginx
    image: nginx:1.12-alpine
    volumeMounts:
    - name: html
      mountPath: /usr/share/nginx/html
  - name: pagegen
    image: alpine
    volumeMounts:
    - name: html
      mountPath: /html
    command: ["/bin/sh", "-c"]
    args:
    - while true; do
        echo $(hostname) $(date) >> /html/index.html;
        sleep 10;
      done

事实上、也只有多个容器挂在同一个存储卷时"共享"才有具体的意义

2、重要字段详解

[root@master ~]# kubectl explain pod.spec.containers.volumeMounts
KIND:     Pod
VERSION:  v1

RESOURCE: volumeMounts <[]Object>

DESCRIPTION:
     Pod volumes to mount into the container's filesystem. Cannot be updated.

     VolumeMount describes a mounting of a Volume within a container.

FIELDS:
   mountPath	<string> -required-
   #挂载点路径、容器文件系统上的路径、必选字段
     Path within the container at which the volume should be mounted. Must not
     contain ':'.

   mountPropagation	<string>
     mountPropagation determines how mounts are propagated from the host to
     container and the other way around. When not set, MountPropagationNone is
     used. This field is beta in 1.10.

   name	<string> -required-
   #指定要挂在的存储的名称、必选字段
     This must match the Name of a Volume.

   readOnly	<boolean>
   #是否挂在只读卷
     Mounted read-only if true, read-write otherwise (false or unspecified).
     Defaults to false.

   subPath	<string>
   #挂在存储卷时使用的子路径、即mountPath指定的路径下使用一个子路径作为挂载点
     Path within the volume from which the container's volume should be mounted.
     Defaults to "" (volume's root).

   subPathExpr	<string>
     Expanded path within the volume from which the container's volume should be
     mounted. Behaves similarly to SubPath but environment variable references
     $(VAR_NAME) are expanded using the container's environment. Defaults to ""
     (volume's root). SubPathExpr and SubPath are mutually exclusive.

三、临时存储卷

1、应用场景

同一pod内的多个容器间问价你的共享、或者作为容器数据的临时存储目录用户数据缓存系统等

2、字段属性详解

[root@master ~]# kubectl explain pod.spec.volumes.emptyDir
KIND: Pod
VERSION: v1

RESOURCE: emptyDir <Object>

DESCRIPTION:
EmptyDir represents a temporary directory that shares a pod's lifetime.
More info: https://kubernetes.io/docs/concepts/storage/volumes#emptydir

Represents an empty directory for a pod. Empty directory volumes support
ownership management and SELinux relabeling.

FIELDS:
medium <string>
#medium：此目录所在的存储介质的类型、可取值为"default" 或 "Memory"、默认为default、表示使用节点的默认存储介质
"Memory"表示使用基于RAM的临时文件系统tmpfs、空间受限于内存、但性能非常好、通常用于容器中的应用提供缓存空间

What type of storage medium should back this directory. The default is ""
which means to use the node's default medium. Must be an empty string
(default) or Memory. More info:
https://kubernetes.io/docs/concepts/storage/volumes#emptydir

sizeLimit <string>
#当前存储卷的空间限额、默认值为nil、表示不限制；不过、在medium字段值为"Memory"时建议务必定义此限额
Total amount of local storage required for this EmptyDir volume. The size
limit is also applicable for memory medium. The maximum usage on memory
medium EmptyDir would be the minimum value between the SizeLimit specified
here and the sum of memory limits of all containers in a pod. The default
is nil which means that the limit is undefined. More info:
http://kubernetes.io/docs/user-guide/volumes#emptydir

3、资源清单

[root@master chapter7]# cat vol-emptydir.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: vol-emptydir-pod
spec:
  volumes:
  - name: html
    emptyDir: {}
  containers:
  - name: nginx
    image: nginx:1.12-alpine
    volumeMounts:
    - name: html
      mountPath: /usr/share/nginx/html
  - name: pagegen
    image: alpine
    volumeMounts:
    - name: html
      mountPath: /html
    command: ["/bin/sh", "-c"]
    args:
    - while true; do
        echo $(hostname) $(date) >> /html/index.html;
        sleep 10;
      done

4、创建运行

[root@master chapter7]# kubectl apply -f vol-emptydir.yaml 
pod/vol-emptydir-pod created

5、查看验证

[root@master chapter7]# kubectl get pod -o wide
NAME                               READY   STATUS      RESTARTS   AGE     IP               NODE     NOMINATED NODE   READINESS GATES
vol-emptydir-pod                   2/2     Running     0          14m     10.244.2.68      node2    <none>           <none>

[root@master chapter7]# culr 10.244.2.68
-bash: culr: command not found
[root@master chapter7]# curl 10.244.2.68
vol-emptydir-pod Mon Aug 10 07:58:35 UTC 2020
vol-emptydir-pod Mon Aug 10 07:58:45 UTC 2020
vol-emptydir-pod Mon Aug 10 07:58:55 UTC 2020
......
vol-emptydir-pod Mon Aug 10 08:17:56 UTC 2020
vol-emptydir-pod Mon Aug 10 08:18:06 UTC 2020
vol-emptydir-pod Mon Aug 10 08:18:16 UTC 2020

6、查看详细信息

pod 资源的详细信息中会显示存储卷的相关存储的相关状态、包裹其创建成功、相关的类型及参数、以及容器中的挂载状态等信息

[root@master chapter7]# kubectl describe pods vol-emptydir-pod 
Name:         vol-emptydir-pod
Namespace:    default
Priority:     0
Node:         node2/192.168.118.20
......
Containers:
  nginx:
    Container ID:   docker://b7e816b54cb4145f47d9bb8f4375963d533966df2d3da682b3a58a30f90c19f7
......
    Mounts:
      /usr/share/nginx/html from html (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-pwl2t (ro)
  pagegen:
  ......
    Command:
      /bin/sh
      -c
    Args:
      while true; do echo $(hostname) $(date) >> /html/index.html; sleep 10; done
    State:          Running
      Started:      Mon, 10 Aug 2020 15:58:35 +0800
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /html from html (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-pwl2t (ro)
Conditions:
......
Volumes:
  html:
    Type:       EmptyDir (a temporary directory that shares a pod's lifetime)
    Medium:     
    SizeLimit:  <unset>
  default-token-pwl2t:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-pwl2t
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age    From               Message
  ----    ------     ----   ----               -------
  Normal  Pulling    8m27s  kubelet, node2     Pulling image "nginx:1.12-alpine"
  Normal  Scheduled  8m26s  default-scheduler  Successfully assigned default/vol-emptydir-pod to node2
  Normal  Pulled     8m10s  kubelet, node2     Successfully pulled image "nginx:1.12-alpine"
  Normal  Created    8m10s  kubelet, node2     Created container nginx
  Normal  Started    8m9s   kubelet, node2     Started container nginx
  Normal  Pulling    8m9s   kubelet, node2     Pulling image "alpine"
  Normal  Pulled     7m39s  kubelet, node2     Successfully pulled image "alpine"
  Normal  Created    7m39s  kubelet, node2     Created container pagegen
  Normal  Started    7m39s  kubelet, node2     Started container pagegen

7、emptyDir存储卷也可以基于RAM创建tmpfs文件系统的存储卷、常用于为容器的应用提供高性能缓存　　

volumes:
  - name: cache
    emptyDir: 
      medium: Memory

emptyDir卷简单易用、但技能用于临时存储、另外还存在一些类型的存储卷建构在emptyDir之上、并额外提供了它所没有的功能例如gitRepo

四、临时存储卷(gitRepo)

基于emptyDir构建的gitRepo存储卷可以在pod对象的声明周期其实时从相应的GIT仓库中复制相应的数据文件到底层的中、从而使得它具有一定意义上的持久性

gitRepo可以看做是emptyDir存储卷的一种实际应用、使用该存储卷的pod资源可以通过挂在目录访问指定的代码仓库中的数据

使用gitRepo存储卷的pod资源在创建时、会首选创建一个空目录并克隆一份指定的git仓库中的数据至该目录、而后再创建容器并挂在存储卷

1、字段详解

[root@master ~]# kubectl explain pod.spec.volumes.gitRepo
KIND: Pod
VERSION: v1

RESOURCE: gitRepo <Object>

DESCRIPTION:
GitRepo represents a git repository at a particular revision. DEPRECATED:
GitRepo is deprecated. To provision a container with a git repo, mount an
EmptyDir into an InitContainer that clones the repo using git, then mount
the EmptyDir into the Pod's container.

Represents a volume that is populated with the contents of a git
repository. Git repo volumes do not support ownership management. Git repo
volumes support SELinux relabeling. DEPRECATED: GitRepo is deprecated. To
provision a container with a git repo, mount an EmptyDir into an
InitContainer that clones the repo using git, then mount the EmptyDir into
the Pod's container.

FIELDS:
directory <string>
#目标目录名称，名称中不包含 ".." 字符 "."表示将仓库中的数据直接复制到卷目录中、否则、即为复制到卷目录中以用户指定的字符喜欢为名称的子目录中
Target directory name. Must not contain or start with '..'. If '.' is
supplied, the volume directory will be the git repository. Otherwise, if
specified, the volume will contain the git repository in the subdirectory
with the given name.

repository <string> -required-
#git仓库的URL、必选字段
Repository URL

revision <string>
#特定revision的提交哈希码
Commit hash for the specified revision

2、资源清单

[root@master chapter7]# cat vol-gitrepo.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: vol-gitrepo
spec:
  containers:
  - name: nginx
    image: nginx:1.12-alpine
    volumeMounts:
    - name: html
      mountPath: /usr/share/nginx/html
  volumes:
  - name: html
    gitRepo:
      repository: https://github.com/iKubernetes/k8s_book.git
      directory: .
      revision: "master"

3、创建运行

[root@master chapter7]# kubectl apply -f vol-gitrepo.yaml 
pod/vol-gitrepo created

使用gitRepo存储卷的pod资源运行的工作节点上必须安装有git程序，否则克隆仓库的操作将无从完成

4、效果验证

[root@master chapter7]# kubectl get pod -o wide
NAME               READY   STATUS              RESTARTS   AGE     IP            NODE    NOMINATED NODE   READINESS GATES
pod-example        1/1     Running             1          4d23h   10.244.2.9    node2   <none>           <none>
vol-emptydir-pod   2/2     Running             0          64m     10.244.2.68   node2   <none>           <none>
vol-gitrepo        0/1     ContainerCreating   0          78s     <none>        node1   <none>           <none>

[root@master chapter7]# kubectl describe pod vol-gitrepo
Name:         vol-gitrepo
Namespace:    default
Priority:     0
Node:         node1/192.168.118.19
Start Time:   Mon, 10 Aug 2020 17:00:31 +0800
Labels:       <none>
Annotations:  Status:  Pending
IP:           
IPs:          <none>
Containers:
  nginx:
    Container ID:   
    Image:          nginx:1.12-alpine
    Image ID:       
    Port:           <none>
    Host Port:      <none>
    State:          Waiting
      Reason:       ContainerCreating
    Ready:          False
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /usr/share/nginx/html from html (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-pwl2t (ro)
Conditions:
  Type              Status
  Initialized       True 
  Ready             False 
  ContainersReady   False 
  PodScheduled      True 
Volumes:
  html:
    Type:        GitRepo (a volume that is pulled from git when the pod is created)
    Repository:  https://github.com/iKubernetes/k8s_book.git
    Revision:    master
  default-token-pwl2t:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-pwl2t
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason       Age                From               Message
  ----     ------       ----               ----               -------
  Normal   Scheduled    94s                default-scheduler  Successfully assigned default/vol-gitrepo to node1
  Warning  FailedMount  25s (x7 over 88s)  kubelet, node1     MountVolume.SetUp failed for volume "html" : failed to exec 'git clone -- https://github.com/iKubernetes/k8s_book.git .': Cloning into '.'...
fatal: could not read Username for 'https://github.com': No such device or address
: exit status 128

kubernetes 1.12版本起、gitRepo存储卷已经被废弃、所以在之后的版本中若要使用它配置pod对象、建议读者借助初始化容器将仓库中的数据复制到emptyDir存储卷上，并在主容器中使用此存储卷　　

五、临时存储卷(hostPath)

hostPath类型的存储卷时指将工作节点上某个文件系统的目录或文件挂在于pod中的一种存储卷、它可以独立于pod资源的生命周期、因而具有持久性

但它是工作节点本地的存储空间、仅使用于特定情况下的存储卷使用需要

例如：将工作节点陕干的文件系统关联为pod的存储卷、从而使得容器访问节点文件系统上的数据、这一点在运行由管理任务的系统级pod资源需要访问节点上的文件时尤为有用

1、字段详解

DirectoryOrCreate	 #指定的路径不存在时定将其创建为0755的空目录。属主属组均为Kubelet

If nothing exists at the given path, an empty directory will be created there as needed with permission set to 0755, having the same group and ownership with Kubelet.

Directory：A directory must exist at the given path  #必须存在的目录路径

FileOrCreate： #指定的路径不存在时自动创建其创建权限为0644的空文件、属主和属组同时Kubelet

If nothing exists at the given path, an empty file will be created there as needed with permission set to 0644, having the same group and ownership with Kubelet.

File：A file must exist at the given path  #必须存在的文件路径

Socket：A UNIX socket must exist at the given path  #必须存在的socket文件路径

CharDevic：A character device must exist at the given path #必须存在的字符设备文件路径

BlockDevice：A block device must exist at the given path #不需存在的块设备文件路径

2、redis环境

1、资源清单

[root@master chapter5]# cat redis.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis
  labels:
    app: default
spec:
  replicas: 1
  selector:
    matchLabels:
      app: redis
      role: logstor
  template:
    metadata:
      labels:
        app: redis
        role: logstor
    spec:
      containers:
      - name: redis
        image: redis:4.0-alpine
        ports:
        - name: redis
          containerPort: 63

2、创建运行

[root@master chapter5]# kubectl apply -f redis.yaml 
deployment.apps/redis created          

[root@master chapter7]#  kubectl expose deployment redis --port=6379
service/redis exposed

3、验证效果

[root@master chapter7]#  kubectl expose deployment redis --port=6379
service/redis exposed

[root@master chapter7]# kubectl get svc
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP    6d18h
redis        ClusterIP   10.106.30.154   <none>        6379/TCP   51s

[root@master chapter5]# kubectl get all -o wide
NAME                         READY   STATUS              RESTARTS   AGE     IP            NODE    NOMINATED NODE   READINESS GATES
pod/redis-588694bf8c-s6tls   1/1     Running             0          54s     10.244.1.42   node1   <none>           <none>

[root@master chapter7]# kubectl exec -it pod/redis-588694bf8c-s6tls -- /bin/sh

/data # nslookup redis.default.svc.cluster.local
Server:		10.96.0.10
Address:	10.96.0.10:53


Name:	redis.default.svc.cluster.local
Address: 10.106.30.154

/data # ls
dump.rdb
/data # redis-cli -h redis.default.svc.cluster.local
redis.default.svc.cluster.local:6379> keys *
(empty list or set)

3、hostPath环境

1、资源清单

[root@master chapter7]# cat vol-hostpath.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: vol-hostpath-pod
spec:
  containers:
  - name: filebeat
    image: ikubernetes/filebeat:5.6.7-alpine
    env:
    - name: REDIS_HOST
      value: redis.default.svc.cluster.local
    - name: LOG_LEVEL
      value: info
    volumeMounts:
    - name: varlog
      mountPath: /var/log
    - name: socket
      mountPath: /var/run/docker.sock
    - name: varlibdockercontainers
      mountPath: /var/lib/docker/containers
      readOnly: true
  terminationGracePeriodSeconds: 30
  volumes:
  - name: varlog
    hostPath:
      path: /var/log
  - name: varlibdockercontainers
    hostPath:
      path: /var/lib/docker/containers
  - name: socket
    hostPath:
      path: /var/run/docker.sock

2、创建运行

[root@master chapter7]# kubectl apply -f vol-hostpath.yaml 
pod/vol-hostpath-pod created

[root@master ~]# kubectl get pods
NAME                     READY   STATUS              RESTARTS   AGE
redis-588694bf8c-s6tls   1/1     Running             0          16h
vol-hostpath-pod         1/1     Running             0          15h

3、验证效果

[root@master ~]# kubectl exec -it vol-hostpath-pod -- /bin/sh
/ # ps aux
PID   USER     TIME   COMMAND
    1 root       0:19 /usr/local/bin/filebeat -e -c /etc/filebeat/filebeat.yml
   14 root       0:00 /bin/sh
   20 root       0:00 ps aux
/ # cat /etc/filebeat/filebeat.yml
filebeat.registry_file: /var/log/containers/filebeat_registry
filebeat.idle_timeout: 5s
filebeat.spool_size: 2048

logging.level: info

filebeat.prospectors:
- input_type: log
  paths:
    - "/var/log/containers/*.log"
    - "/var/log/docker/containers/*.log"
    - "/var/log/startupscript.log"
    - "/var/log/kubelet.log"
    - "/var/log/kube-proxy.log"
    - "/var/log/kube-apiserver.log"
    - "/var/log/kube-controller-manager.log"
    - "/var/log/kube-scheduler.log"
    - "/var/log/rescheduler.log"
    - "/var/log/glbc.log"
    - "/var/log/cluster-autoscaler.log"
  symlinks: true
  json.message_key: log
  json.keys_under_root: true
  json.add_error_key: true
  multiline.pattern: '^\s'
  multiline.match: after
  document_type: kube-logs
  tail_files: true
  fields_under_root: true

output.redis:
  hosts: ${REDIS_HOST:?No Redis host configured. Use env var REDIS_HOST to set host.}
  key: "filebeat"
/ # nslookup redis.default.svc.cluster.local
nslookup: can't resolve '(null)': Name does not resolve

Name:      redis.default.svc.cluster.local
Address 1: 10.106.30.154 redis.default.svc.cluster.local

posted @ 2020-08-15 17:43 活的潇洒80 阅读(611) 评论(0) 编辑收藏举报

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Kubernetes进阶实战读书笔记：存储卷概述

一、Kubernetes 支持的存储类型

1、从官方手册查看

2、重点关注

二、存储卷的使用方式

1、存储卷的配置组成

2、示例文档

2、重要字段详解

三、临时存储卷

1、应用场景

2、字段属性详解

3、资源清单

4、创建运行

5、查看验证

6、查看详细信息

7、emptyDir存储卷也可以基于RAM创建tmpfs文件系统的存储卷、常用于为容器的应用提供高性能缓存

四、临时存储卷(gitRepo)

1、字段详解

2、资源清单

3、创建运行

使用gitRepo存储卷的pod资源运行的工作节点上必须安装有git程序，否则克隆仓库的操作将无从完成

4、效果验证

五、临时存储卷(hostPath)

1、字段详解

2、redis环境

3、hostPath环境

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