Say I have a bunch of similar tasks run in parallel in Azure Batch pool of VMs. These tasks connect to SQL database and extract data for individual table using sqlcmd. Then table output is compressed by piping it to 7zip.exe. So, command line is similar to (mind those "")
cmd /c sqlcmd -i.\table.sql -S . -E -s "," -I -h -1 -W| "c:\Program Files\7-Zip\7z.exe" a -tbzip2 -si "out.csv.bz2"
The catch here is that normally data is saved to each VMs local storage as out.csv.bz2 file. However, under Azure Batch once tasks are finished, VMs allocated from the pool are gone. So, I need a mechanism to collect all these out.csv.bz2 files to Azure storage account (eg Azure Blob Storage or Data Lake storage). I don't seem find a mechanism in Azure Batch to redirect/persist output instead of local VMs storage directly to Azure Storage for my command line task(s).
Does anyone know how to accomplish this?
If you are on a VirtualMachineConfiguration pool, you can use OutputFile to upload to Azure Storage Blobs. This functionality is not available in CloudServiceConfiguration pools yet.
For CloudServiceConfiguration pools, please see this related question.
Related
I have a task to copy BLOB storage to the other location and make synchronization between them. Unfortunately, I didn't find a solution for it. Is there a possibility to make it more simple way?
You can use the AzCopy utility to synchronize files, or replicate a source location to a destination location.
The azcopy sync command identifies all files at the destination, and then compares file names and last modified timestamps before the starting the sync operation. If you set the --delete-destination flag to true AzCopy deletes files without providing a prompt. If you want a prompt to appear before AzCopy deletes a file, set the --delete-destination flag to prompt.
Also check the az storage blob sync from Azure CLI.
Also consider the newer: Object Replication for Block Blobs.
Object replication asynchronously copies block blobs between a source
storage account and a destination account.
how to run sed command on some csv files i have in azure blob storage ?
I am using Azure copy activity to copy data from csv file to postgres, but my csv is a big 20 gb file and contains NULL character \x000 something.. which is not recognized by postgres Text data type. ADF copy activity cannot convert csv string columns to postgres abyte, so only option is to use Text. I thought of a workaround solution to run sed command on my csv to substitute null character with some other character like - . So I need to know how to run sed commands on azure csv files which are in blob storage. should i copy them first to a new vm which has linux, but also note that adf copy activity does not show an option to copy binary files from blob to some lunux vm
You can't treat blobs as local files. You'll have to download them first, to local storage (local can be in your vm or anywhere else that your machine has access to). As for Data Factory: You definitely can copy content from a VM, as long as you create an appropriate file share (e.g. samba share), along with Integration Runtime, if the VM in question is locked down to a particular VNet.
I simply added a resource i.e. a linux vm in ms azure subscription. copied files from azure blob to vm, ran sed command, copied files back to blob
I have one large file on my azure blob storage container. I want to move my file from blob storage to Linux VM created on azure> How can I do that using data factory? or any Powershell Command?
The easiest and without any tools is to generate SAS token for the blob and run CURL.
Generate SAS
And then CURL
curl <blob_sas_url> -o output.txt
If you need this automated every time you can generate SAS URL from the script or just use AzCopy.
Please reference this blog：How to copy data to VM from blob storage, it gives you a way to solve the problem with Data Factory:
"To anyone who might get into same problem in future, I solved my problem by using 'copy wizard' present in ADF.
We need to install Data Management Gateway on VM and register it before we use 'copy wizard'.
We need to specify blob storage as source and in destination we need to choose 'File Server Share' option. In 'File Server Share' option we need to specify user credentials which I suppose pipeline uses to login to VM, folder on VM where pipeline will copy the data."
From the Azure Blog Storage document, there is another way can help you Mount Blob storage as a file system with blobfuse on Linux.
Blobfuse is a virtual file system driver for Azure Blob storage. Blobfuse allows you to access your existing block blob data in your storage account through the Linux file system. Blobfuse uses the virtual directory scheme with the forward-slash '/' as a delimiter.
This guide shows you how to use blobfuse, and mount a Blob storage container on Linux and access data. To learn more about blobfuse, read the details in the blobfuse repository.
If you want to use AzCopy, you can reference this document Transfer data with AzCopy and Blob storage. You can download the AzCopy for Linux. It provided the command for upload and download files.
For example, upload file:
azcopy copy "<local-file-path>" "https://<storage-account-name>.<blob or dfs>.core.windows.net/<container-name>/<blob-name>"
For PowerShell, you need to use PowerShell Core 6.x and later on all platforms. It works with Windows and Linux virtual machines using Windows PowerShell 5.1 (Windows only) or PowerShell 6 (Windows and Linux).
You can find the PowerShell commands in this document:Quickstart: Upload, download, and list blobs by using Azure PowerShell
Here is another link talked about Copy Files to Azure VM using PowerShell Remoting 6 (Windows and Linux).
Hope this helps.
You have many options to copy content from the blob store to the disk on the VM:
1. Use AzCopy
2. Use Azure Pipelines - File copy task
3. Use Powershell cmdlets
A lot of content is available on these approaches on SO!
It seems this is not properly documented anywhere so I am sharing the most basic approach which is to use the azcopy tool that is available for both windows/linux OS. This approach doens't need the complexity of creating the credentials/tokens.
Download azcopy
Its simple executable which can be run directly after extraction
Create a managed identity(system-assigned identity) for your Virtual machine. Navigate to VM-> Identity -> Turn the Status to 'ON' -> Save
Now the VM can be assigned permission at the following levels:
Storage account
Container (file system)
Resource group
Subscription
For this case, navigate to storage account -> IAM -> Add role assignment -> Select role 'Storage Blob Data Contributor' -> Assign access to 'Virtual machine' -> Select the desired VM -> SAVE
NOTE: If you give access to the VM on IAM properties of a Resource Group, the VM will be able to access all the storage accounts of the RG.
Login to VM and assume the identity (run the command from the same location where the azcopy is located)
For windows : azcopy login --identity
For linux : ./azcopy login --identity
Upload or download the files now:
azcopy cp "source-file" "storageUri/blob-container/" --recursive=true
Example: azcopy cp "C:\test.txt" "https://mystorageaccount.blob.core.windows.net/backup/" --recursive=true
IAM permission can take few minutes to propagate. If you change/add the permissions/access level anywhere, run the azcopy login --identity command again to get the updated identity.
More info on Azcopy is available here
In Microsoft Azure, I have a source storage account in one region and 3 destination storage accounts in 3 different regions. I want to copy blob data from source storage account to all 3 destination storage accounts. Currently I am using the azcopy (version 6) command in a bash script to do it. First it completes for one region then starts for another. It takes almost an hour everyday due to the geographical distance between the regions. I wanted to know if azcopy has any option to copy blobs from source to multiple destinations in a parallel manner. Any other suggestions to reduce the time are also invited :)
Generalization of azcopy command being used in my bash script:
/usr/bin/azcopy --source https://[srcaccount].blob.core.windows.net/[container]/[path/to/blob] --source-key $SOURCE_KEY --destination https://[destaccount].blob.core.windows.net/[container]/[path/to/blob] --dest-key $DEST_KEY --recursive --quiet --exclude-older
Azcopy can always only copy data from one source to one destination. But since you mention that you need to do this every day, I would probably go for a scheduled pipeline in Azure Data Factory instead. There you can also set up the three different copy jobs as parallel activities.
Just spawn a separate instance of your script for each destination. That way your copy will happen in parallel.
Here is a simple guide for doing this in BASH : https://www.slashroot.in/how-run-multiple-commands-parallel-linux
Is there a way to upload multiple files to Azure Blob Storage from a Linux machine, either using the terminal or an application (web based or not)?
Thank you for your interest – There are two options to upload files in Azure Blobs from Linux:
Setup and use XPlatCLI by following the steps below:
Install the OS X Installer from http://azure.microsoft.com/en-us/documentation/articles/xplat-cli/
Open a Terminal window and connect to your Azure subscription by either downloading and using a publish settings file or by logging in to Azure using an organizational account (find instructions here)
Create an environment variable AZURE_STORAGE_CONNECTION_STRING and set its value (you will need your account name and account key): “DefaultEndpointsProtocol=https;AccountName=enter_your_account;AccountKey=enter_your_key”
Upload a file into Azure blob storage by using the following command: azure storage blob upload [file] [container] [blob]
Use one of the third party web azure storage explorers like CloudPortam: http://www.cloudportam.com/.
You can find the full list of azure storage explorers here: http://blogs.msdn.com/b/windowsazurestorage/archive/2014/03/11/windows-azure-storage-explorers-2014.aspx.
You can use the find command with the exec option to execute the command to upload each file, as described here as described here:
find *.csv -exec az storage blob upload --file {} --container-name \
CONTAINER_NAME --name {} --connection-string=‘CONNECTION_STRING’ \;
where CONNECTION_STRING is the connection string of your Azure Blob store container, available from portal.azure.com. This will upload all CSV files in your directory to the Azure Blob store associated with the connection string.
If you prefer the commandline and have a recent Python interpreter, the Azure Batch and HPC team has released a code sample with some AzCopy-like functionality on Python called blobxfer. This allows full recursive directory ingress into Azure Storage as well as full container copy back out to local storage. [full disclosure: I'm a contributor for this code]