如何在Kubernetes集群中使用OpenStack Cinder创建存储类并动态提供持久卷 [英] How to use OpenStack Cinder to create storage class and dynamically provision persistent volume in Kubernetes Cluster

问题描述

最近在练习 kubernetes 时，发现没有文档和示例专门解释如何在 kubernetes 中正确使用 cinder.

Recently when practicing kubernetes , I found there is no doc and example specifically explaining how to use cinder correctly in kubernetes.

那么如何设置在 kubernetes 中使用的 cinder 呢?

So how to setup cinder to be used in kubernetes ?

推荐答案

我做了一些实验并研究了如何使用 kubernetes 设置 cinder.找一个合适的来记录和分享.

I did some experiment and worked out how to setup cinder with kubernetes. Just find a suitable to document and share.

准备

• Kubernetes 集群
• openstack 环境并确保 cinder 服务可用

背景

根据我的调查，组件 kube-controller-manager 负责加载 Kubernetes 中的卷插件和相关插件.所以我们可以通过调整 kube-controller-manager 配置来使 cinder 可用.

From my investigation, component kube-controller-manager is responsible for loading volume plugins and related in Kubernetes. So we could make cinder available by adjusting kube-controller-manager configuration.

步骤

1. 准备 cloud.conf 文件以包含您的 openstack 凭证

1. Prepare cloud.conf file to contain your openstack creds

准备您的 openstack 凭证并保存为文件，例如 /etc/kubernetes/cloud.conf 位于 kube-controller-manager 所在的 kubernetes 控制面板中.以下是 cloud.conf

Prepare your openstack creds and saved as a file , for example /etc/kubernetes/cloud.conf in kubernetes control panel which kube-controller-manager locates. The following is example for cloud.conf

[Global]
auth-url=$your_openstack_auth_url
username=$your_openstack_user
password=$your_user_pw
region=$your_openstack_reigon
tenant-name=$your_project_name
domain-name=$your_domain_name
ca-file=$your_openstack_ca

大多数可以从您的 stackrc 文件中找到.并且 ca-file 项是可选的，具体取决于您的 openstack auth url 是 http 还是 https

Most could be found from your stackrc file. And ca-file item is optional, depending on if your openstack auth url is http or https

1. 调整kube-controller-manager启动配置

此链接是 kube-controller-manager (https://kubernetes.io/docs/admin/kube-controller-manager/)

实际上我们应该根据您当前的参数添加两个额外的参数

Actually we should add two extra parameters based on your current one

--cloud-provider=openstack
--cloud-config=/etc/kubernetes/cloud.conf

启动kube-controller-manager主要有两种方式:1)使用systemd 2)使用静态pod.

There are mainly two ways to start kube-controller-manager : 1) using systemd 2) using static pod .

一个提示，如果您使用 kube-controller-manager 的静态 pod，请确保您已将所有文件(例如 cloud.conf 或 openstack ca 文件)安装到您的容器中.

Just one tips, if you are using static pod for kube-controller-manager , make sure you have mount all files such as cloud.conf or openstack ca file into your container.

验证

我们将创建一个存储类，并使用该存储类动态创建持久卷.

We will create a storageclass, and use this storageclass to create persistent volume dynamically.

1. 创建一个名为standard的存储类:

demo-sc.yml:

apiVersion: storage.k8s.io/v1beta1
kind: StorageClass
metadata:
  name: standard
  annotations:
    storageclass.beta.kubernetes.io/is-default-class: "true"
  labels:
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: EnsureExists
provisioner: kubernetes.io/cinder

使用命令kubectl create -f demo-sc.yml创建并使用命令kubectl get sc验证是否创建正确

Using command kubectl create -f demo-sc.yml to create and using command kubectl get sc to verify if it created correctly

NAME                 TYPE
standard (default)   kubernetes.io/cinder 

1. 创建一个 PersistentVolumeClaim 以在 Cinder 中使用 StorageClass 提供 Persistent Volume:

demo-pvc.yml:

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: cinder-claim
  annotations:
    volume.beta.kubernetes.io/storage-class: "standard"
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

通过kubectl create -f demo-pvc.yml

现在通过命令kubectl get pvc

NAME           STATUS    VOLUME                                         CAPACITY   ACCESSMODES   STORAGECLASS   AGE
cinder-claim   Bound     pvc-5dd3d62e-9204-11e7-bc43-fa163e0e0379   1Gi          RWO           standard       23h

在openstack环境下，通过命令cinder list | 检查grep pvc-5dd3d62e-9204-11e7-bc43-fa163e0e0379

And in openstack environment, checking by command cinder list | grep pvc-5dd3d62e-9204-11e7-bc43-fa163e0e0379

    root@ds0114:~# cinder list | grep pvc-5dd3d62e-9204-11e7-bc43- fa163e0e0379
| ddd8066d-2e16-4cb2-a89e-cd9d5b99ef1b | available | kubernetes-dynamic- pvc-5dd3d62e-9204-11e7-bc43-fa163e0e0379 |  1   |   CEPH_SSD  |  false   |                                       |

所以现在 StorageClass 在 Kubernetes 中使用 Cinder 运行良好.

So now StorageClass is working well using Cinder in Kubernetes.

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