This article shows how to create containers with theAzure Storage client module for Go. Blobs in Azure Storage are organized into containers. Before you can upload a blob, you must first create a container.

Prerequisites

• Azure subscription -create one for free
• Azure storage account -create a storage account
• Go 1.18+

Set up your environment

If you don't have an existing project, this section shows how to set up a project to work with the Azure Blob Storage client module for Go. The steps include module installation, addingimport paths, and creating an authorized client object. For details, seeGet started with Azure Blob Storage and Go.

Install modules

Install theazblob module using the following command:

go get github.com/Azure/azure-sdk-for-go/sdk/storage/azblob

To authenticate with Microsoft Entra ID (recommended), install theazidentity module using the following command:

go get github.com/Azure/azure-sdk-for-go/sdk/azidentity

Add import paths

In your code file, add the following import paths:

import (    "github.com/Azure/azure-sdk-for-go/sdk/azidentity""github.com/Azure/azure-sdk-for-go/sdk/storage/azblob")

These import paths represent the minimum needed to get started. Some code examples in this article might require additional import paths. For specific details and example usage, seeCode samples.

Create a client object

To connect an app to Blob Storage, create a client object usingazblob.NewClient. The following example shows how to create a client object usingDefaultAzureCredential for authorization:

func getServiceClientTokenCredential(accountURL string) *azblob.Client {    // Create a new service client with token credential    credential, err := azidentity.NewDefaultAzureCredential(nil)    handleError(err)    client, err := azblob.NewClient(accountURL, credential, nil)    handleError(err)    return client}

Authorization

The authorization mechanism must have the necessary permissions to create a container. For authorization with Microsoft Entra ID (recommended), you need Azure RBAC built-in roleStorage Blob Data Contributor or higher. To learn more, see the authorization guidance forCreate Container (REST API).

About container naming

A container name must be a valid DNS name, as it forms part of the unique URI used to address the container or its blobs. Follow these rules when naming a container:

• Container names can be between 3 and 63 characters long.
• Container names must start with a letter or number, and can contain only lowercase letters, numbers, and the dash (-) character.
• Consecutive dash characters aren't permitted in container names.

The URI for a container resource is formatted as follows:

https://my-account-name.blob.core.windows.net/my-container-name

Create a container

To create a container, call the following method:

• CreateContainer

Containers are created immediately beneath the storage account. It's not possible to nest one container beneath another. An exception is thrown if a container with the same name already exists.

The following example shows how to create a container:

func createContainer(client *azblob.Client, containerName string) {    // Create a container    _, err := client.CreateContainer(context.TODO(), containerName, nil)    handleError(err)}

Create the root container

A root container serves as a default container for your storage account. Each storage account can have one root container, which must be named$root. The root container must be explicitly created or deleted.

You can reference a blob stored in the root container without including the root container name. The root container enables you to reference a blob at the top level of the storage account hierarchy. For example, you can reference a blob in the root container as follows:

https://<storage-account-name>.blob.core.windows.net/default.html

The following example creates the container if it doesn't already exist in the storage account:

func createRootContainer(client *azblob.Client) {    // Create root container    _, err := client.CreateContainer(context.TODO(), "$root", nil)    handleError(err)}

Resources

To learn more about creating a container using the Azure Blob Storage client module for Go, see the following resources.

Code samples

• Viewcode samples from this article (GitHub)

REST API operations

The Azure SDK for Go contains libraries that build on top of the Azure REST API, allowing you to interact with REST API operations through familiar Go paradigms. The client library methods for creating a container use the following REST API operation:

• Create Container (REST API)

Client module resources

• Client module reference documentation
• Client module source code
• Package (pkg.go.dev)

Related content

• This article is part of the Blob Storage developer guide for Go. To learn more, see the full list of developer guide articles atBuild your Go app.