启用扩展持久卷

Question

我需要调整一堆PVC的大小。似乎最简单的方法是通过 扩展持久卷功能。但是我无法获得 配置配合。

ExpandPersistentVolumes功能门设置在库贝莱特的所有三个 母版，如图所示：

(输出修剪到相关位以确保理智(

$ parallel-ssh -h /tmp/masters -P "ps aux | grep feature"
172.20.53.249: root     15206  7.4  0.5 619888 83952 ?        Ssl  19:52   0:02 /opt/kubernetes/bin/kubelet  --feature-gates=ExpandPersistentVolumes=true,ExperimentalCriticalPodAnnotation=true
[1] 12:53:08 [SUCCESS] 172.20...
172.20.58.111: root     17798  4.5  0.5 636280 87328 ?        Ssl  19:51   0:04 /opt/kubernetes/bin/kubelet --feature-gates=ExpandPersistentVolumes=true,ExperimentalCriticalPodAnnotation=true
[2] 12:53:08 [SUCCESS] 172.20...
172.20.53.240: root      9287  4.0  0.5 645276 90528 ?        Ssl  19:50   0:06 /opt/kubernetes/bin/kubelet --feature-gates=ExpandPersistentVolumes=true,ExperimentalCriticalPodAnnotation=true
[3] 12:53:08 [SUCCESS] 172.20..

apiserver 具有PersistentVolumeClaimResize准入控制器，如下所示：

$ kubectl --namespace=kube-system get pod -o yaml | grep -i admission                                                                                                                                                           
/usr/local/bin/kube-apiserver --admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,NodeRestriction,PersistentVolumeClaimResize,ResourceQuota
/usr/local/bin/kube-apiserver --admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,NodeRestriction,PersistentVolumeClaimResize,ResourceQuota
/usr/local/bin/kube-apiserver --admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,NodeRestriction,PersistentVolumeClaimResize,ResourceQuota

但是，当我创建或编辑存储类以添加allowVolumeExpansion时， 它在保存时被删除。例如：

$ cat new-sc.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
creationTimestamp: null
labels:
k8s-addon: storage-aws.addons.k8s.io
name: gp2-2
selfLink: /apis/storage.k8s.io/v1/storageclasses/gp2
parameters:
encrypted: "true"
kmsKeyId: arn:aws:kms:us-west-2:<omitted>
type: gp2
zone: us-west-2a
provisioner: kubernetes.io/aws-ebs
reclaimPolicy: Delete
allowVolumeExpansion: true
$ kubectl create -f new-sc.yaml
storageclass "gp2-2" created
$ kubectl get sc gp2-2 -o yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
creationTimestamp: 2018-05-22T20:00:17Z
labels:
k8s-addon: storage-aws.addons.k8s.io
name: gp2-2
resourceVersion: "2546166"
selfLink: /apis/storage.k8s.io/v1/storageclasses/gp2-2
uid: <omitted>
parameters:
encrypted: "true"
kmsKeyId: arn:aws:kms:us-west-2:<omitted>
type: gp2
zone: us-west-2a
provisioner: kubernetes.io/aws-ebs
reclaimPolicy: Delete

我错过了什么？从存储类配置中删除此密钥是什么？

编辑：这是kube-apiserver pods使用的命令。它没有说明功能门。集群是使用 Kops 启动的。

- /bin/sh
- -c
- mkfifo /tmp/pipe; (tee -a /var/log/kube-apiserver.log < /tmp/pipe & ) ; exec
/usr/local/bin/kube-apiserver --address=127.0.0.1 --admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,NodeRestriction,PersistentVolumeClaimResize,ResourceQuota
--allow-privileged=true --anonymous-auth=false --apiserver-count=3 --authorization-mode=RBAC
--basic-auth-file=/srv/kubernetes/basic_auth.csv --client-ca-file=/srv/kubernetes/ca.crt
--cloud-provider=aws --etcd-cafile=/srv/kubernetes/ca.crt --etcd-certfile=/srv/kubernetes/etcd-client.pem
--etcd-keyfile=/srv/kubernetes/etcd-client-key.pem --etcd-servers-overrides=/events#https://127.0.0.1:4002
--etcd-servers=https://127.0.0.1:4001 --insecure-port=8080 --kubelet-preferred-address-types=InternalIP,Hostname,ExternalIP
--proxy-client-cert-file=/srv/kubernetes/apiserver-aggregator.cert --proxy-client-key-file=/srv/kubernetes/apiserver-aggregator.key
--requestheader-allowed-names=aggregator --requestheader-client-ca-file=/srv/kubernetes/apiserver-aggregator-ca.cert
--requestheader-extra-headers-prefix=X-Remote-Extra- --requestheader-group-headers=X-Remote-Group
--requestheader-username-headers=X-Remote-User --secure-port=443 --service-cluster-ip-range=100.64.0.0/13
--storage-backend=etcd3 --tls-cert-file=/srv/kubernetes/server.cert --tls-private-key-file=/srv/kubernetes/server.key
--token-auth-file=/srv/kubernetes/known_tokens.csv --v=1 > /tmp/pipe 2>&1

Answer 1

如果您没有为该选项启用 alpha 功能门，则可能会发生这种情况。

您是否为 kube-apiserver 设置了--feature-gates选项？

--feature-gates mapStringBool  - A set of key=value pairs that describe feature gates for alpha/experimental features. Options are:
...
ExpandPersistentVolumes=true|false (ALPHA - default=false)
...

更新：如果在命令行参数中看不到此选项，则需要添加它(--feature-gates=ExpandPersistentVolumes=true(。

如果你将 kube-apiserver 作为 pod 运行，你应该编辑/etc/kubernetes/manifests/kube-apiserver.yaml并将功能门选项添加到其他参数中。 kube-apiserver 将自动重新启动。

如果你运行 kube-apiserver 作为由 systemd 维护的进程，你应该编辑$KUBE_API_ARGS在单独文件中kube-apiserver.service或服务选项，并在那里附加功能门选项。使用systemctl restart kube-apiserver.service命令重新启动服务。

启用它后，您可以使用 allowVolumeExpansion 选项创建一个 StorageClass 对象：

# kubectl get sc -o yaml --export
apiVersion: v1
items:
- allowVolumeExpansion: true
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
creationTimestamp: 2018-05-23T14:38:43Z
labels:
k8s-addon: storage-aws.addons.k8s.io
name: gp2-2
namespace: ""
resourceVersion: "1385"
selfLink: /apis/storage.k8s.io/v1/storageclasses/gp2-2
uid: fe516dcf-5e96-11e8-a86d-42010a9a0002
parameters:
encrypted: "true"
kmsKeyId: arn:aws:kms:us-west-2:<omitted>
type: gp2
zone: us-west-2a
provisioner: kubernetes.io/aws-ebs
reclaimPolicy: Delete
volumeBindingMode: Immediate
kind: List
metadata:
resourceVersion: ""
selfLink: ""