Good day , I'm new in azure blob and don't know what kinds of experiments can be done with it, I have searched about it but still isn't clear to me. I'll be really gratefull if you can tell me about easy experiments that can be done in azure blob.
Blob storage stores unstructured data such as text, binary data, documents or media files.
Hope you meant the samples or the operations that can be done using azure blob when you say experiments.
You can do operations like uploading the files, downloading , listing etc. programmatically or through the UI.
You can above operations using languages such as .Net, Java,Python,JS..etc which you can find links in this documentation Azure Storage samples
But to access Azure Storage, you'll need an Azure subscription or free trial account. All access to Azure Storage takes place through a storage account. For this quickstart, create a storage account using the Azure portal.
Refer to Create a storage account
You can do above operations in portal directly .This sample blog can give you quick insights to perform them through portal.
A number of solutions exist for migrating existing data to Blob storage like AzCopy ,Azure datafactory etc
Introduction to Blob (object) storage - Azure Storage | Microsoft Docs
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I gave access to few of my colleagues on one of my Azure storage Account (Contributor).
The idea is to have them access (read and list) the data in the blob container, but I want to restrict them from downloading the data.
I tried the below:
Using SAS key with read and list still allowing them to download the blobs (Using Storage Explorer).
Giving them just reader access and "Storage blob data reader" access did not stop them from downloading the data.
Changing the blob access tier to "Archive" is not a solution that suites.
Tried creating a custom role, but failing to find the exact allow and disallow permissions.
I see the similar kind of question before but wasn't been answered yet # Restrict from downloading file on Azure Blob
Can you please help.
If a user has read permission on a blob (either through SAS Token or Azure AD role), they will be able to download the blob.
To prevent users from downloading a blob, remove read permissions on the blob for the users. For example if you are using a SAS Token, simply use List permissions there. Then the users will be able to see the list of the blobs but will not be able to download it.
Is it possible to delete a blob using any settings in the Azure portal or via code in c#?
Let's say, I am creating log files and uploading it to a blob container. I would like to delete all the log files which are older than a week time.
Please see the Tasks option under Automation section.
you probably want to look into azure blob storage lifecycle management:
https://azure.microsoft.com/en-us/blog/azure-blob-storage-lifecycle-management-public-preview/
#savagepanda is right. Azure Blob Storage has support for lifecycle management.
Manage the Azure Blob storage lifecycle
Azure Blob storage lifecycle management offers a rich, rule-based
policy for GPv2 and Blob storage accounts. Use the policy to
transition your data to the appropriate access tiers or expire at the
end of the data's lifecycle.
The lifecycle management policy lets you:
Transition blobs to a cooler storage tier (hot to cool, hot to
archive, or cool to archive) to optimize for performance and cost
Delete blobs at the end of their lifecycles Define rules to be run
once per day at the storage account level Apply rules to containers or
a subset of blobs (using prefixes as filters)
When I initiate an async copy of a block blob to another storage account using StartCopyAsync, is Azure doing any kind of integrity check for me, or if not, is there a way to have it do so?
I found that I can set the Properties.ContentMD5 property and have the integrity verified when uploading blobs. Is it also verifying during a copy operation?
I searched through the docs and found no mention of an integrity check during an async copy specifically. I found a couple references to AzCopy making integrity checks, and it also has the /CheckMD5 option, which is essentially what I'd like Azure to do after the blob copy.
As far as I know, the azure blob SDK is the package of the azure blob rest api.
So the azure SDK StartCopyAsync method will use copy operation(rest api) send to the azure server side to tell the server copy.
According to the copy operation article, you could find "When a blob is copied, the following system properties are copied to the destination blob with the same values".
It contains the "Content-MD5" property.
I want to cache some cropped images and serve them without calculating them again in a Azure WebSite. When I used the Azure VM I was just storing them at the D drive (temporary drive) but I don't know where to store them now.
I could use the Path.GetTempPath but I am not sure if this is the best approach.
Can you suggest me where should I store my Temporary files when I am serving from a Azure WebSite?
Azure Websites also comes with a Temp folder. The path is defined in the environment variable %TEMP%
You can store your images in App_Data folder in the root of your application or you can use Azure CDN for caching.
You could store the processed content on Azure Blob Storage and serve the content from there.
If what you really want is a cache you can also look into using the Azure Redis Cache.
you can use Path.GetTempPath() and Path.GetTempFileName() functions for the temp file name, but you are limited though in terms of space, so if you're doing a 10K save for every request and expect 100,000 requests at a time per server, maybe blob storage is better.
Following sample demonstrate how to save temp file in azure, both Path and Bolb.
Doc is here:https://code.msdn.microsoft.com/How-to-store-temp-files-in-d33bbb10
Code click here:https://github.com/Azure-Samples/storage-blob-dotnet-store-temp-files/archive/master.zip
There has been numerous discussions related to storing images (or binary data) in the database or file system (Refer: Storing Images in DB - Yea or Nay?)
We have decided to use the file system for storing images and relevant image specific metadata in the database itself in the short term and migrate to an amazon s3 based data store in the future. Note: the data store will be used to store user pictures, photos from group meetings ...
Are there any off the shelf java based open source frameworks which provide an abstraction to handle storage and retrieval via http for the above data stores. We wouldn't want to write any code related to admin tasks like backups, purging, maintenance.
Jets3t - http://jets3t.s3.amazonaws.com/index.html
We've used this and it works like a charm for S3.
I'm not sure I understand if you are looking for a framework that will work for both file-system storage and S3, but as unique as S3 is, I'm not sure that such a thing would exist. Obviously with S3, backups and maintenance are handled for you.