Clean up change-default-storage-class.md
windsonsea
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942e9f943e
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@ -39,10 +39,14 @@ kubectl. Complete documentation is found in the [kubectl manual](/docs/reference
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kubectl handles locating and authenticating to the API server. If you want to directly access the REST API with an http client like
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`curl` or `wget`, or a browser, there are multiple ways you can locate and authenticate against the API server:
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1. Run kubectl in proxy mode (recommended). This method is recommended, since it uses the stored apiserver location and verifies the identity of the API server using a self-signed cert. No man-in-the-middle (MITM) attack is possible using this method.
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1. Alternatively, you can provide the location and credentials directly to the http client. This works with client code that is confused by proxies. To protect against man in the middle attacks, you'll need to import a root cert into your browser.
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1. Run kubectl in proxy mode (recommended). This method is recommended, since it uses
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the stored API server location and verifies the identity of the API server using a
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self-signed certificate. No man-in-the-middle (MITM) attack is possible using this method.
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1. Alternatively, you can provide the location and credentials directly to the http client.
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This works with client code that is confused by proxies. To protect against man in the
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middle attacks, you'll need to import a root cert into your browser.
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Using the Go or Python client libraries provides accessing kubectl in proxy mode.
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Using the Go or Python client libraries provides accessing kubectl in proxy mode.
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#### Using kubectl proxy
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@ -151,16 +155,23 @@ describes how you can configure this as a cluster administrator.
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### Programmatic access to the API
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Kubernetes officially supports client libraries for [Go](#go-client), [Python](#python-client), [Java](#java-client), [dotnet](#dotnet-client), [JavaScript](#javascript-client), and [Haskell](#haskell-client). There are other client libraries that are provided and maintained by their authors, not the Kubernetes team. See [client libraries](/docs/reference/using-api/client-libraries/) for accessing the API from other languages and how they authenticate.
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Kubernetes officially supports client libraries for [Go](#go-client), [Python](#python-client),
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[Java](#java-client), [dotnet](#dotnet-client), [JavaScript](#javascript-client), and
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[Haskell](#haskell-client). There are other client libraries that are provided and maintained by
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their authors, not the Kubernetes team. See [client libraries](/docs/reference/using-api/client-libraries/)
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for accessing the API from other languages and how they authenticate.
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#### Go client
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* To get the library, run the following command: `go get k8s.io/client-go@kubernetes-<kubernetes-version-number>` See [https://github.com/kubernetes/client-go/releases](https://github.com/kubernetes/client-go/releases) to see which versions are supported.
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* To get the library, run the following command: `go get k8s.io/client-go@kubernetes-<kubernetes-version-number>`
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See [https://github.com/kubernetes/client-go/releases](https://github.com/kubernetes/client-go/releases)
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to see which versions are supported.
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* Write an application atop of the client-go clients.
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{{< note >}}
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client-go defines its own API objects, so if needed, import API definitions from client-go rather than from the main repository. For example, `import "k8s.io/client-go/kubernetes"` is correct.
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`client-go` defines its own API objects, so if needed, import API definitions from client-go rather than
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from the main repository. For example, `import "k8s.io/client-go/kubernetes"` is correct.
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{{< /note >}}
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@ -190,14 +201,18 @@ func main() {
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}
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```
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If the application is deployed as a Pod in the cluster, see [Accessing the API from within a Pod](/docs/tasks/access-application-cluster/access-cluster/#accessing-the-api-from-a-pod).
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If the application is deployed as a Pod in the cluster, see
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[Accessing the API from within a Pod](/docs/tasks/access-application-cluster/access-cluster/#accessing-the-api-from-a-pod).
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#### Python client
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To use [Python client](https://github.com/kubernetes-client/python), run the following command: `pip install kubernetes`. See [Python Client Library page](https://github.com/kubernetes-client/python) for more installation options.
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To use [Python client](https://github.com/kubernetes-client/python), run the following command:
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`pip install kubernetes`. See [Python Client Library page](https://github.com/kubernetes-client/python)
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for more installation options.
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The Python client can use the same [kubeconfig file](/docs/concepts/configuration/organize-cluster-access-kubeconfig/)
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as the kubectl CLI does to locate and authenticate to the API server. See this [example](https://github.com/kubernetes-client/python/blob/master/examples/out_of_cluster_config.py):
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as the kubectl CLI does to locate and authenticate to the API server. See this
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[example](https://github.com/kubernetes-client/python/blob/master/examples/out_of_cluster_config.py):
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```python
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from kubernetes import client, config
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@ -224,10 +239,12 @@ cd java
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mvn install
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```
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See [https://github.com/kubernetes-client/java/releases](https://github.com/kubernetes-client/java/releases) to see which versions are supported.
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See [https://github.com/kubernetes-client/java/releases](https://github.com/kubernetes-client/java/releases)
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to see which versions are supported.
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The Java client can use the same [kubeconfig file](/docs/concepts/configuration/organize-cluster-access-kubeconfig/)
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as the kubectl CLI does to locate and authenticate to the API server. See this [example](https://github.com/kubernetes-client/java/blob/master/examples/examples-release-15/src/main/java/io/kubernetes/client/examples/KubeConfigFileClientExample.java):
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as the kubectl CLI does to locate and authenticate to the API server. See this
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[example](https://github.com/kubernetes-client/java/blob/master/examples/examples-release-15/src/main/java/io/kubernetes/client/examples/KubeConfigFileClientExample.java):
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```java
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package io.kubernetes.client.examples;
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@ -278,10 +295,16 @@ public class KubeConfigFileClientExample {
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#### dotnet client
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To use [dotnet client](https://github.com/kubernetes-client/csharp), run the following command: `dotnet add package KubernetesClient --version 1.6.1` See [dotnet Client Library page](https://github.com/kubernetes-client/csharp) for more installation options. See [https://github.com/kubernetes-client/csharp/releases](https://github.com/kubernetes-client/csharp/releases) to see which versions are supported.
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To use [dotnet client](https://github.com/kubernetes-client/csharp),
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run the following command: `dotnet add package KubernetesClient --version 1.6.1`.
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See [dotnet Client Library page](https://github.com/kubernetes-client/csharp)
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for more installation options. See
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[https://github.com/kubernetes-client/csharp/releases](https://github.com/kubernetes-client/csharp/releases)
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to see which versions are supported.
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The dotnet client can use the same [kubeconfig file](/docs/concepts/configuration/organize-cluster-access-kubeconfig/)
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as the kubectl CLI does to locate and authenticate to the API server. See this [example](https://github.com/kubernetes-client/csharp/blob/master/examples/simple/PodList.cs):
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as the kubectl CLI does to locate and authenticate to the API server. See this
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[example](https://github.com/kubernetes-client/csharp/blob/master/examples/simple/PodList.cs):
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```csharp
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using System;
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@ -313,10 +336,14 @@ namespace simple
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#### JavaScript client
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To install [JavaScript client](https://github.com/kubernetes-client/javascript), run the following command: `npm install @kubernetes/client-node`. See [https://github.com/kubernetes-client/javascript/releases](https://github.com/kubernetes-client/javascript/releases) to see which versions are supported.
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To install [JavaScript client](https://github.com/kubernetes-client/javascript),
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run the following command: `npm install @kubernetes/client-node`. See
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[https://github.com/kubernetes-client/javascript/releases](https://github.com/kubernetes-client/javascript/releases)
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to see which versions are supported.
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The JavaScript client can use the same [kubeconfig file](/docs/concepts/configuration/organize-cluster-access-kubeconfig/)
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as the kubectl CLI does to locate and authenticate to the API server. See this [example](https://github.com/kubernetes-client/javascript/blob/master/examples/example.js):
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as the kubectl CLI does to locate and authenticate to the API server. See this
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[example](https://github.com/kubernetes-client/javascript/blob/master/examples/example.js):
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```javascript
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const k8s = require('@kubernetes/client-node');
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@ -333,10 +360,13 @@ k8sApi.listNamespacedPod('default').then((res) => {
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#### Haskell client
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See [https://github.com/kubernetes-client/haskell/releases](https://github.com/kubernetes-client/haskell/releases) to see which versions are supported.
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See [https://github.com/kubernetes-client/haskell/releases](https://github.com/kubernetes-client/haskell/releases)
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to see which versions are supported.
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The [Haskell client](https://github.com/kubernetes-client/haskell) can use the same [kubeconfig file](/docs/concepts/configuration/organize-cluster-access-kubeconfig/)
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as the kubectl CLI does to locate and authenticate to the API server. See this [example](https://github.com/kubernetes-client/haskell/blob/master/kubernetes-client/example/App.hs):
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The [Haskell client](https://github.com/kubernetes-client/haskell) can use the same
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[kubeconfig file](/docs/concepts/configuration/organize-cluster-access-kubeconfig/)
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as the kubectl CLI does to locate and authenticate to the API server. See this
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[example](https://github.com/kubernetes-client/haskell/blob/master/kubernetes-client/example/App.hs):
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```haskell
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exampleWithKubeConfig :: IO ()
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@ -8,15 +8,10 @@ weight: 90
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This page shows how to change the default Storage Class that is used to
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provision volumes for PersistentVolumeClaims that have no special requirements.
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## {{% heading "prerequisites" %}}
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{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
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<!-- steps -->
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## Why change the default storage class?
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@ -39,67 +34,63 @@ for details about addon manager and how to disable individual addons.
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## Changing the default StorageClass
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1. List the StorageClasses in your cluster:
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1. List the StorageClasses in your cluster:
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```bash
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kubectl get storageclass
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```
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```bash
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kubectl get storageclass
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```
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The output is similar to this:
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The output is similar to this:
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```bash
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NAME PROVISIONER AGE
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standard (default) kubernetes.io/gce-pd 1d
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gold kubernetes.io/gce-pd 1d
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```
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```bash
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NAME PROVISIONER AGE
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standard (default) kubernetes.io/gce-pd 1d
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gold kubernetes.io/gce-pd 1d
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```
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The default StorageClass is marked by `(default)`.
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The default StorageClass is marked by `(default)`.
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1. Mark the default StorageClass as non-default:
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The default StorageClass has an annotation
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`storageclass.kubernetes.io/is-default-class` set to `true`. Any other value
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or absence of the annotation is interpreted as `false`.
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The default StorageClass has an annotation
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`storageclass.kubernetes.io/is-default-class` set to `true`. Any other value
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or absence of the annotation is interpreted as `false`.
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To mark a StorageClass as non-default, you need to change its value to `false`:
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To mark a StorageClass as non-default, you need to change its value to `false`:
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```bash
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kubectl patch storageclass standard -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'
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```
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```bash
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kubectl patch storageclass standard -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'
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```
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where `standard` is the name of your chosen StorageClass.
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where `standard` is the name of your chosen StorageClass.
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1. Mark a StorageClass as default:
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Similar to the previous step, you need to add/set the annotation
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`storageclass.kubernetes.io/is-default-class=true`.
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Similar to the previous step, you need to add/set the annotation
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`storageclass.kubernetes.io/is-default-class=true`.
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```bash
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kubectl patch storageclass gold -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
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```
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```bash
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kubectl patch storageclass gold -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
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```
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Please note that at most one StorageClass can be marked as default. If two
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or more of them are marked as default, a `PersistentVolumeClaim` without `storageClassName` explicitly specified cannot be created.
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Please note that at most one StorageClass can be marked as default. If two
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or more of them are marked as default, a `PersistentVolumeClaim` without
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`storageClassName` explicitly specified cannot be created.
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1. Verify that your chosen StorageClass is default:
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```bash
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kubectl get storageclass
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```
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The output is similar to this:
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```bash
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NAME PROVISIONER AGE
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standard kubernetes.io/gce-pd 1d
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gold (default) kubernetes.io/gce-pd 1d
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```
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```bash
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kubectl get storageclass
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```
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The output is similar to this:
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```bash
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NAME PROVISIONER AGE
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standard kubernetes.io/gce-pd 1d
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gold (default) kubernetes.io/gce-pd 1d
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```
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## {{% heading "whatsnext" %}}
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* Learn more about [PersistentVolumes](/docs/concepts/storage/persistent-volumes/).
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