是否可以将不同的 pod 挂载到本地持久卷的同一部分? [英] Is it possible to mount different pods to the same portion of a local persistent volume?
问题描述
基本上，我正在创建一个包含 2 个 Pod(单主机集群)的 StatefulSet 部署，我希望每个 Pod 都能够挂载到主机中的一个基本文件夹，以及它下面的一个子文件夹:
基本文件夹挂载:/mnt/disks/ssd
Pod#1 -/mnt/disks/ssd/pod-1
Pod#2 -/mnt/disks/ssd/pod-2
我只设法将第一个 pod 挂载到基本文件夹，但第二个文件夹无法挂载(因为卷已被占用)
这是音量:
apiVersion: v1种类:持久卷元数据:名称:example-local-pv规格:容量:存储:5Gi访问模式:- 读写一次持久卷回收策略:删除存储类名称:本地存储当地的:路径:/mnt/disks/ssd节点亲和力:必需的:节点选择器条款:- 匹配表达式:- 密钥:kubernetes.io/hostname接线员:在价值观:- ubuntukuber这是有状态集中的用法:
apiVersion: apps/v1beta1种类:StatefulSet元数据:名称:应用程序命名空间:test-ns规格:服务名称:应用程序复制品:2........卷挂载:- 名称:数据挂载路径:/var/lib/app/data体积索赔模板:- 元数据:名称:数据规格:访问模式:[ReadWriteOnce"]存储类名称:本地存储"资源:要求:存储:2Gi所以，我基本上希望每个副本都使用自己的子文件夹 - 如何实现?
== 编辑 ==
我已经取得了一些进展，我能够使用以下 YAML 将多个副本安装到同一个挂载中(我尝试在其上执行此操作的应用程序是 rabbitmq - 所以我将应用程序名称保留为是)
---种类:持久卷api版本:v1元数据:名称:光伏本地命名空间:test-rabbitmq标签:类型:本地规格:存储类名称:本地容量:存储:6Gi访问模式:- 读写一次主机路径:路径:/mnt/磁盘"---种类:PersistentVolumeClaimapi版本:v1元数据:名称:hostpath-pvc命名空间:test-rabbitmq规格:存储类名称:本地访问模式:- 读写一次资源:要求:存储:3Gi选择器:匹配标签:类型:本地---在 StatefulSet 中，我声明了这个卷:
卷:- 名称:rabbitmq-data持久卷声明:声明名称:hostpath-pvc并安装rabbitmq-data".
两个 pod 都挂载到同一个文件夹，但不会创建子文件夹 - 这并不可怕，因为默认情况下有 rabbitmq 的子文件夹 - 我会尝试将其扩展到每个 pod 中以使用子文件夹
我能够实现上述场景，您需要的是在您的 pv 中使用claimRef"来绑定您的 PVC.请看下面的 pv json 和 statefulset json
PV-0.json
<代码>{"kind": "PersistentVolume","apiVersion": "v1",元数据":{"name": "pv-data-vol-0",标签": {类型":本地"}},规格":{容量": {存储":10Gi"},访问模式":[读写一次"],"storageClassName": "本地存储",当地的": {路径":/prafull/data/pv-0"},索赔参考":{命名空间":默认"，名称":数据测试-SF-0"},节点亲和力":{必需的": {节点选择器条款":[{匹配表达式":[{"key": "kubernetes.io/主机名","operator": "在",价值观":[ip-10-0-1-46.ec2.internal"]}]}]}}}}PV-1.json
<代码>{"kind": "PersistentVolume","apiVersion": "v1",元数据":{"name": "pv-data-vol-1",标签": {类型":本地"}},规格":{容量": {存储":10Gi"},访问模式":[读写一次"],"storageClassName": "本地存储",当地的": {路径":/prafull/data/pv-1"},索赔参考":{命名空间":默认"，名称":数据测试-SF-1"},节点亲和力":{必需的": {节点选择器条款":[{匹配表达式":[{"key": "kubernetes.io/主机名","operator": "在",价值观":[ip-10-0-1-46.ec2.internal"]}]}]}}}}Statefulset.json
<代码>{"kind": "StatefulSet","apiVersion": "apps/v1beta1",元数据":{"name": "test-sf",标签": {状态":测试-SF"}},规格":{副本":2，模板": {元数据":{标签": {应用程序":测试-SF"},注释":{"pod.alpha.kubernetes.io/initialized": "true"}}......},volumeClaimTemplates":[{元数据":{名称":数据"},规格":{访问模式":[读写一次"],"storageClassName": "本地存储",资源": {要求": {存储":10Gi"}}}}]}}将创建两个 pod，test-sf-0 和 test-sf-1 依次创建两个 PVC data-test-sf-0 和 data-test-sf-1，它们将绑定到 PV-0 和 Pv-1 分别.因此，test-sf-0 将写入 PV-0 中指定的位置，而 test-sf-1 将写入 PV-1 中指定的位置.希望这会有所帮助.
Basically, I'm creating a StatefulSet deployment with 2 pods (single host cluster), I would like to that each pod will be able to mount to a base folder in the host, and to a subfolder beneath it:
Base folder mount: /mnt/disks/ssd
Pod#1 - /mnt/disks/ssd/pod-1
Pod#2 - /mnt/disks/ssd/pod-2
I've managed only to mount the first pod to the base folder, but the 2nd folder cannot mount (as the volume is already taken)
This is the volume:
apiVersion: v1
kind: PersistentVolume
metadata:
name: example-local-pv
spec:
capacity:
storage: 5Gi
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Delete
storageClassName: local-storage
local:
path: /mnt/disks/ssd
nodeAffinity:
required:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- ubuntukuber
This is the usage in the stateful set:
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
name: app
namespace: test-ns
spec:
serviceName: app
replicas: 2
....
....
volumeMounts:
- name: data
mountPath: /var/lib/app/data
volumeClaimTemplates:
- metadata:
name: data
spec:
accessModes: [ "ReadWriteOnce" ]
storageClassName: "local-storage"
resources:
requests:
storage: 2Gi
So, i basically would like that each replica would use its own subfolder - how can one achieve it?
== EDIT ==
I've made some progress, i'm able to mount several replicas into the same mount, using the following YAMLs (the app i'm trying to do it on is rabbitmq - so i'll leave the app name as is)
---
kind: PersistentVolume
apiVersion: v1
metadata:
name: pv-local
namespace: test-rabbitmq
labels:
type: local
spec:
storageClassName: local
capacity:
storage: 6Gi
accessModes:
- ReadWriteOnce
hostPath:
path: "/mnt/disks"
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: hostpath-pvc
namespace: test-rabbitmq
spec:
storageClassName: local
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 3Gi
selector:
matchLabels:
type: local
---
In the StatefulSet i'm declaring this volume:
volumes:
- name: rabbitmq-data
persistentVolumeClaim:
claimName: hostpath-pvc
And mounting "rabbitmq-data".
Both pods mount to the same folder, but will not create subfolders - this is no terrible situation as by default there are rabbitmq's subfolders - i'll try to expand it into each pod to use a subfolder
I am able to achieve the above scenario, what you need is "claimRef" in your pv to bind your PVC. Please have a look at following pv json and statefulset json
PV-0.json
{
"kind": "PersistentVolume",
"apiVersion": "v1",
"metadata": {
"name": "pv-data-vol-0",
"labels": {
"type": "local"
}
},
"spec": {
"capacity": {
"storage": "10Gi"
},
"accessModes": [
"ReadWriteOnce"
],
"storageClassName": "local-storage",
"local": {
"path": "/prafull/data/pv-0"
},
"claimRef": {
"namespace": "default",
"name": "data-test-sf-0"
},
"nodeAffinity": {
"required": {
"nodeSelectorTerms": [
{
"matchExpressions": [
{
"key": "kubernetes.io/hostname",
"operator": "In",
"values": [
"ip-10-0-1-46.ec2.internal"
]
}
]
}
]
}
}
}
}
PV-1.json
{
"kind": "PersistentVolume",
"apiVersion": "v1",
"metadata": {
"name": "pv-data-vol-1",
"labels": {
"type": "local"
}
},
"spec": {
"capacity": {
"storage": "10Gi"
},
"accessModes": [
"ReadWriteOnce"
],
"storageClassName": "local-storage",
"local": {
"path": "/prafull/data/pv-1"
},
"claimRef": {
"namespace": "default",
"name": "data-test-sf-1"
},
"nodeAffinity": {
"required": {
"nodeSelectorTerms": [
{
"matchExpressions": [
{
"key": "kubernetes.io/hostname",
"operator": "In",
"values": [
"ip-10-0-1-46.ec2.internal"
]
}
]
}
]
}
}
}
}
Statefulset.json
{
"kind": "StatefulSet",
"apiVersion": "apps/v1beta1",
"metadata": {
"name": "test-sf",
"labels": {
"state": "test-sf"
}
},
"spec": {
"replicas": 2,
"template": {
"metadata": {
"labels": {
"app": "test-sf"
},
"annotations": {
"pod.alpha.kubernetes.io/initialized": "true"
}
}
...
...
},
"volumeClaimTemplates": [
{
"metadata": {
"name": "data"
},
"spec": {
"accessModes": [
"ReadWriteOnce"
],
"storageClassName": "local-storage",
"resources": {
"requests": {
"storage": "10Gi"
}
}
}
}
]
}
}
There will be two pods created test-sf-0 and test-sf-1 which in-turn will be created two PVC data-test-sf-0 and data-test-sf-1 which will be bound to PV-0 and Pv-1 respectively. Hence test-sf-0 will write to the location specified in PV-0 and test-sf-1 will write in location specified on PV-1. Hope this helps.
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