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Add documentation for ACI volume management commands (#11362) 

* Add documentation for ACI volume management commands

Signed-off-by: Guillaume Tardif <guillaume.tardif@docker.com>

* Style and formatting updates

* Minor style update

Co-authored-by: Usha Mandya <47779042+usha-mandya@users.noreply.github.com>
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@ -155,14 +155,17 @@ You can also deploy and manage multi-container applications defined in Compose f
You can deploy containers or Compose applications that use persistent data
stored in volumes. Azure File Share can be used to support volumes for ACI
containers.
containers.
With an existing Azure File Share, with storage account name `mystorageaccount`
Using an existing Azure File Share with storage account name `mystorageaccount`
and file share name `myfileshare`, you can specify a volume in your deployment `run`
command as follows:
`docker run -v storageaccount@fileshare:/target/path myimage` and the runtime
container will see the file share content in `/target/path`.
```
docker run -v storageaccount/fileshare:/target/path myimage
```
The runtime container will see the file share content in `/target/path`.
In a Compose application, the volume specification must use the following syntax
in the Compose file:
@ -181,11 +184,66 @@ volumes:
storage_account_name: mystorageaccount
```
Now, you need to create an Azure storage account and File Share using the Azure
When you deploy a single container or a Compose application, your
Azure login automatically fetches the key to the Azure storage account.
### Managing Azure volumes
To create a volume that you can use in containers or Compose applications when
using your ACI Docker context, you can use the `docker volume create` command,
and specify an Azure storage account name and the file share name:
```
$ docker --context aci volume create --storage-account mystorageaccount --fileshare test-volume
[+] Running 2/2
⠿ mystorageaccount Created 26.2s
⠿ test-volume Created 0.9s
mystorageaccount/test-volume
```
By default, if the storage account does not already exist, this command
creates a new storage account using the Standard LRS as a default SKU, and the
resource group and location associated with you Docker ACI context.
If you specify an existing storage account, the command creates a new
file share in the exsting account:
```
$ docker --context aci volume create --storage-account mystorageaccount --fileshare test-volume2
[+] Running 2/2
⠿ mystorageaccount Use existing 0.7s
⠿ test-volume2 Created 0.7s
mystorageaccount/test-volume2
```
Alternatively, you can create an Azure storage account or a file share using the Azure
portal, or the `az` [command line](https://docs.microsoft.com/en-us/azure/storage/files/storage-how-to-use-files-cli).
When you deploy a single container or a Compose application, your
Azure login will automatically fetch the key to the Azure storage account.
You can also list volumes that are available for use in containers or Compose applications:
```
$ docker --context aci volume ls
ID DESCRIPTION
mystorageaccount/test-volume Fileshare test-volume in mystorageaccount storage account
mystorageaccount/test-volume2 Fileshare test-volume2 in mystorageaccount storage account
```
To delete a volume and the corresponding Azure file share, use the `volume rm` command:
```
$ docker --context aci volume rm mystorageaccount/test-volume
mystorageaccount/test-volume
```
This permanently deletes the Azure file share and all its data.
When deleting a volume in Azure, the command checks whether the specified file share
is the only file share available in the storage account. If the storage account is
created with the `docker volume create` command, `docker volume rm` also
deletes the storage account when it does not have any file shares.
If you are using a storage account created without the `docker volume create` command
(through Azure portal or with the `az` command line for example), `docker volume rm`
does not delete the storage account, even when it has zero remaining file shares.
## Using ACI resource groups as namespaces