PVC 相关的定义
kubectl explain persistentVolumeClaim
KIND: PersistentVolumeClaim
VERSION: v1
DESCRIPTION:
PersistentVolumeClaim is a user's request for and claim to a persistent
volume
FIELDS:
apiVersion <string>
APIVersion defines the versioned schema of this representation of an
object. Servers should convert recognized schemas to the latest internal
value, and may reject unrecognized values. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
kind <string>
Kind is a string value representing the REST resource this object
represents. Servers may infer this from the endpoint the client submits
requests to. Cannot be updated. In CamelCase. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
metadata <Object>
Standard object's metadata. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
spec <Object>
Spec defines the desired characteristics of a volume requested by a pod
author. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#persistentvolumeclaims
status <Object>
Status represents the current information/status of a persistent volume
claim. Read-only. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#persistentvolumeclaims
# kubectl explain persistentVolumeClaim.spec
KIND: PersistentVolumeClaim
VERSION: v1
RESOURCE: spec <Object>
DESCRIPTION:
Spec defines the desired characteristics of a volume requested by a pod
author. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#persistentvolumeclaims
PersistentVolumeClaimSpec describes the common attributes of storage
devices and allows a Source for provider-specific attributes
FIELDS:
accessModes <[]string> #访问模型是否支持多人访问
AccessModes contains the desired access modes the volume should have. More
info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#access-modes-1
dataSource <Object> #是否启动数据卷快照
This field requires the VolumeSnapshotDataSource alpha feature gate to be
enabled and currently VolumeSnapshot is the only supported data source. If
the provisioner can support VolumeSnapshot data source, it will create a
new volume and data will be restored to the volume at the same time. If the
provisioner does not support VolumeSnapshot data source, volume will not be
created and the failure will be reported as an event. In the future, we
plan to support more data source types and the behavior of the provisioner
may change.
resources <Object> # 最小资源限制
Resources represents the minimum resources the volume should have. More
info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#resources
selector <Object> #标签选择器用来选择拥有指定标签的bv 里选取pv
A label query over volumes to consider for binding.
storageClassName <string> #存储累名称
Name of the StorageClass required by the claim. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#class-1
volumeMode <string> # 后端存储卷模式
volumeMode defines what type of volume is required by the claim. Value of
Filesystem is implied when not included in claim spec. This is a beta
feature.
volumeName <string> # 后端存储卷名称，如果给定就会指定帮在哪个存储卷上
VolumeName is the binding reference to the PersistentVolume backing this
claim.
在NFS 存储创建几个目录
[root@ES ~]# cd /data/kubernetes/
[root@ES kubernetes]# mkdir pv{1,2,3,4,5,6}
[root@ES kubernetes]# ls
html pv1 pv2 pv3 pv4 pv5 pv6
[root@ES kubernetes]# cat /etc/exports
/data/activemq 192.168.10.31(rw,sync,no_root_squash,no_all_squash)
/data/activemq 192.168.10.4(rw,sync,no_root_squash,no_all_squash)
/data/kubernetes/pv1 192.168.10.0/24(rw,sync,no_root_squash,no_all_squash)
/data/kubernetes/pv2 192.168.10.0/24(rw,sync,no_root_squash,no_all_squash)
/data/kubernetes/pv3 192.168.10.0/24(rw,sync,no_root_squash,no_all_squash)
/data/kubernetes/pv4 192.168.10.0/24(rw,sync,no_root_squash,no_all_squash)
/data/kubernetes/pv5 192.168.10.0/24(rw,sync,no_root_squash,no_all_squash)
/data/kubernetes/pv6 192.168.10.0/24(rw,sync,no_root_squash,no_all_squash)
[root@ES kubernetes]# systemctl restart nfs
测试
[root@node01 ~]# mount -t nfs 192.168.10.16:/data/kubernetes/pv1 /kubernetes/pod 测试完取消挂载
定义PV；不能定义名称空间因为数据集群级别
[root@master ~]# kubectl explain pv
KIND: PersistentVolume
VERSION: v1
DESCRIPTION:
PersistentVolume (PV) is a storage resource provisioned by an
administrator. It is analogous to a node. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes
FIELDS:
apiVersion <string>
APIVersion defines the versioned schema of this representation of an
object. Servers should convert recognized schemas to the latest internal
value, and may reject unrecognized values. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
kind <string>
Kind is a string value representing the REST resource this object
represents. Servers may infer this from the endpoint the client submits
requests to. Cannot be updated. In CamelCase. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
metadata <Object>
Standard object's metadata. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
spec <Object>
Spec defines a specification of a persistent volume owned by the cluster.
Provisioned by an administrator. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#persistent-volumes
status <Object>
Status represents the current information/status for the persistent volume.
Populated by the system. Read-only. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#persistent-volumes
[root@master ~]# kubectl explain pv.spec
KIND: PersistentVolume
VERSION: v1
RESOURCE: spec <Object>
DESCRIPTION:
Spec defines a specification of a persistent volume owned by the cluster.
Provisioned by an administrator. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#persistent-volumes
PersistentVolumeSpec is the specification of a persistent volume.
FIELDS:
accessModes <[]string> 可以写多个；但要看存储设备是否支持
AccessModes contains all ways the volume can be mounted. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#access-modes
ReadWriteOnce –该卷可以通过单个节点以读写方式安装
ReadOnlyMany –该卷可以被许多节点只读安装
ReadWriteMany –该卷可以被许多节点读写安装
简写
RWO-ReadWriteOnce
ROX-ReadOnlyMany
RWX-ReadWriteMany
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.
capacity <map[string]string> 定义空间大小
A description of the persistent volume's resources and capacity. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#capacity
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
claimRef <Object>
ClaimRef is part of a bi-directional binding between PersistentVolume and
PersistentVolumeClaim. Expected to be non-nil when bound. claim.VolumeName
is the authoritative bind between PV and PVC. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#binding
csi <Object>
CSI represents storage that is handled by an external CSI driver (Beta
feature).
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
and exposed to the pod for its usage. 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. Provisioned by an
admin. More info:
https://kubernetes.io/docs/concepts/storage/volumes#gcepersistentdisk
glusterfs <Object>
Glusterfs represents a Glusterfs volume that is attached to a host and
exposed to the pod. Provisioned by an admin. More info:
https://examples.k8s.io/volumes/glusterfs/README.md
hostPath <Object>
HostPath represents a directory on the host. Provisioned by a developer or
tester. This is useful for single-node development and testing only!
On-host storage is not supported in any way and WILL NOT WORK in a
multi-node cluster. 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. Provisioned by an admin.
local <Object>
Local represents directly-attached storage with node affinity
mountOptions <[]string>
A list of mount options, e.g. ["ro", "soft"]. Not validated - mount will
simply fail if one is invalid. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes/#mount-options
nfs <Object>
NFS represents an NFS mount on the host. Provisioned by an admin. More
info: https://kubernetes.io/docs/concepts/storage/volumes#nfs
nodeAffinity <Object>
NodeAffinity defines constraints that limit what nodes this volume can be
accessed from. This field influences the scheduling of pods that use this
volume.
persistentVolumeReclaimPolicy <string>
What happens to a persistent volume when released from its claim. Valid
options are Retain (default for manually created PersistentVolumes), Delete
(default for dynamically provisioned PersistentVolumes), and Recycle
(deprecated). Recycle must be supported by the volume plugin underlying
this PersistentVolume. More info:
https://kubernetes.io/docs/concepts/storage/persistent-volumes#reclaiming
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
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.
storageClassName <string>
Name of StorageClass to which this persistent volume belongs. Empty value
means that this volume does not belong to any StorageClass.
storageos <Object>
StorageOS represents a StorageOS volume that is attached to the kubelet's
host machine and mounted into the pod More info:
https://examples.k8s.io/volumes/storageos/README.md
volumeMode <string> 是可选的API参数。 Filesystem是volumeMode省略参数时使用的默认模式；您可以设置的值volumeMode以Block将卷用作原始块设备。这样的卷作为一个块设备呈现在Pod中，上面没有任何文件系统。此模式对于为Pod提供最快的访问卷的方式很有用，而Pod和卷之间没有任何文件系统层。另一方面，在Pod中运行的应用程序必须知道如何处理原始块设备。
volumeMode defines if a volume is intended to be used with a formatted
filesystem or to remain in raw block state. Value of Filesystem is implied
when not included in spec. This is a beta feature.
vsphereVolume <Object>
VsphereVolume represents a vSphere volume attached and mounted on kubelets
host machine
编写PV的yaml文件
[root@master vml]# cat pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv01
labels:
name: pv01
spec:
accessModes:
- ReadWriteMany
capacity:
storage: 2Gi
nfs:
path: /data/kubernetes/pv1
server: 192.168.10.16
[root@master vml]# kubectl apply -f pv.yaml
persistentvolume/pv01 created
[root@master vml]# kubectl describe pv pv01 查看pv
Name: pv01
Labels: name=pv01
Annotations: kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"v1","kind":"PersistentVolume","metadata":{"annotations":{},"labels":{"name":"pv01"},"name":"pv01"},"spec":{"access
Modes":["...Finalizers: [kubernetes.io/pv-protection]
StorageClass:
Status: Available
Claim:
Reclaim Policy: Retain
Access Modes: RWX
VolumeMode: Filesystem
Capacity: 2Gi
Node Affinity: <none>
Message:
Source:
Type: NFS (an NFS mount that lasts the lifetime of a pod)
Server: 192.168.10.16
Path: /data/kubernetes/pv1
ReadOnly: false
Events: <none>
编写PVC与pod的文件
[root@master vml]# cat hostpath.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: pv01
namespace: default
spec:
accessModes:
- ReadWriteMany
resources:
requests: 最小限制；可以指定义最小限制或做大限制
storage: 2Gi
limits: 最大限制
storage: 2Gi
---
apiVersion: v1
kind: Pod
metadata:
name: host-1
namespace: default
labels:
app: myapp
tier: frontend
spec:
containers:
- name: myapp
image: ikubernetes/myapp:v1
ports:
- name: http
containerPort: 80
- name: https
containerPort: 443
volumeMounts:
- name: html
mountPath: /chenxi/cx
- name: busybox
image: busybox:latest
imagePullPolicy: IfNotPresent
command:
- "/bin/sh"
- "-c"
- "echo 'chenxi1234' >> /cx/html "
volumeMounts:
- name: html
mountPath: /cx
volumes:
- name: html
persistentVolumeClaim:
claimName: pv01 这边引用名字
创建后查看NFS
[root@master vml]# kubectl apply -f hostpath.yaml persistentvolumeclaim/pv01 created pod/host-1 created [root@ES kubernetes]# ls /data/kubernetes/pv2/ html [root@ES kubernetes]# cat /data/kubernetes/pv2/html chenxi1234 chenxi1234 chenxi1234 chenxi1234 chenxi1234 chenxi1234 chenxi1234