Merge pull request #35383 from shannonxtreme/manage-secrets-file-note
Improve Managing Secrets using a Configuration File
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commit
ad25aba971
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@ -13,65 +13,70 @@ description: Creating Secret objects using resource configuration file.
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<!-- steps -->
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## Create the Config file
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## Create the Secret {#create-the-config-file}
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You can create a Secret in a file first, in JSON or YAML format, and then
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create that object. The
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You can define the `Secret` object in a manifest first, in JSON or YAML format,
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and then create that object. The
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[Secret](/docs/reference/generated/kubernetes-api/{{< param "version" >}}/#secret-v1-core)
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resource contains two maps: `data` and `stringData`.
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The `data` field is used to store arbitrary data, encoded using base64. The
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`stringData` field is provided for convenience, and it allows you to provide
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Secret data as unencoded strings.
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the same data as unencoded strings.
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The keys of `data` and `stringData` must consist of alphanumeric characters,
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`-`, `_` or `.`.
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For example, to store two strings in a Secret using the `data` field, convert
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the strings to base64 as follows:
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The following example stores two strings in a Secret using the `data` field.
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```shell
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echo -n 'admin' | base64
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```
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1. Convert the strings to base64:
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The output is similar to:
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```shell
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echo -n 'admin' | base64
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echo -n '1f2d1e2e67df' | base64
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```
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```
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YWRtaW4=
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```
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{{< note >}}
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The serialized JSON and YAML values of Secret data are encoded as base64 strings. Newlines are not valid within these strings and must be omitted. When using the `base64` utility on Darwin/macOS, users should avoid using the `-b` option to split long lines. Conversely, Linux users *should* add the option `-w 0` to `base64` commands or the pipeline `base64 | tr -d '\n'` if the `-w` option is not available.
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{{< /note >}}
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```shell
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echo -n '1f2d1e2e67df' | base64
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```
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The output is similar to:
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The output is similar to:
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```
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YWRtaW4=
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MWYyZDFlMmU2N2Rm
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```
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```
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MWYyZDFlMmU2N2Rm
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```
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1. Create the manifest:
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Write a Secret config file that looks like this:
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```yaml
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apiVersion: v1
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kind: Secret
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metadata:
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name: mysecret
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type: Opaque
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data:
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username: YWRtaW4=
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password: MWYyZDFlMmU2N2Rm
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```
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```yaml
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apiVersion: v1
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kind: Secret
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metadata:
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name: mysecret
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type: Opaque
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data:
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username: YWRtaW4=
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password: MWYyZDFlMmU2N2Rm
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```
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Note that the name of a Secret object must be a valid
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[DNS subdomain name](/docs/concepts/overview/working-with-objects/names#dns-subdomain-names).
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Note that the name of a Secret object must be a valid
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[DNS subdomain name](/docs/concepts/overview/working-with-objects/names#dns-subdomain-names).
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1. Create the Secret using [`kubectl apply`](/docs/reference/generated/kubectl/kubectl-commands#apply):
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{{< note >}}
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The serialized JSON and YAML values of Secret data are encoded as base64
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strings. Newlines are not valid within these strings and must be omitted. When
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using the `base64` utility on Darwin/macOS, users should avoid using the `-b`
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option to split long lines. Conversely, Linux users *should* add the option
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`-w 0` to `base64` commands or the pipeline `base64 | tr -d '\n'` if the `-w`
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option is not available.
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{{< /note >}}
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```shell
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kubectl apply -f ./secret.yaml
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```
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The output is similar to:
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```
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secret/mysecret created
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```
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To verify that the Secret was created and to decode the Secret data, refer to
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[Managing Secrets using kubectl](/docs/tasks/configmap-secret/managing-secret-using-kubectl/#verify-the-secret).
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### Specify unencoded data when creating a Secret
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For certain scenarios, you may wish to use the `stringData` field instead. This
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field allows you to put a non-base64 encoded string directly into the Secret,
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@ -103,25 +108,10 @@ stringData:
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username: <user>
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password: <password>
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```
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When you retrieve the Secret data, the command returns the encoded values,
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and not the plaintext values you provided in `stringData`.
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## Create the Secret object
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Now create the Secret using [`kubectl apply`](/docs/reference/generated/kubectl/kubectl-commands#apply):
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```shell
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kubectl apply -f ./secret.yaml
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```
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The output is similar to:
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```
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secret/mysecret created
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```
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## Check the Secret
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The `stringData` field is a write-only convenience field. It is never output when
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retrieving Secrets. For example, if you run the following command:
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For example, if you run the following command:
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```shell
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kubectl get secret mysecret -o yaml
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@ -143,14 +133,11 @@ metadata:
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type: Opaque
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```
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The commands `kubectl get` and `kubectl describe` avoid showing the contents of a `Secret` by
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default. This is to protect the `Secret` from being exposed accidentally to an onlooker,
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or from being stored in a terminal log.
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To check the actual content of the encoded data, please refer to
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[decoding secret](/docs/tasks/configmap-secret/managing-secret-using-kubectl/#decoding-secret).
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### Specifying both `data` and `stringData`
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If a field, such as `username`, is specified in both `data` and `stringData`,
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the value from `stringData` is used. For example, the following Secret definition:
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If you specify a field in both `data` and `stringData`, the value from `stringData` is used.
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For example, if you define the following Secret:
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```yaml
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apiVersion: v1
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@ -164,7 +151,7 @@ stringData:
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username: administrator
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```
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Results in the following Secret:
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The `Secret` object is created as follows:
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```yaml
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apiVersion: v1
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@ -180,7 +167,7 @@ metadata:
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type: Opaque
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```
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Where `YWRtaW5pc3RyYXRvcg==` decodes to `administrator`.
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`YWRtaW5pc3RyYXRvcg==` decodes to `administrator`.
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## Clean Up
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@ -113,6 +113,8 @@ The commands `kubectl get` and `kubectl describe` avoid showing the contents
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of a `Secret` by default. This is to protect the `Secret` from being exposed
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accidentally, or from being stored in a terminal log.
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To check the actual content of the encoded data, refer to [Decoding the Secret](#decoding-secret).
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## Decoding the Secret {#decoding-secret}
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To view the contents of the Secret you created, run the following command:
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