Azure Backup for Linux VM Failing

Question

Started running into an issue with backing one of our Azure VMs.  The VM is a Linux VM running a customized Ubuntu that runs our Enterprise GitHub instance. 

These backup errors seem to have begun on 6/22 and the below is the verbiage associated with the error.

 

I have done the recommended action and looked for all devices with a dirty filesystem on the VM itself

But these have all come back as clean

 

I have also tried excluding the data disk from backups and still ran into errors so I’m unsure where the issue could be with the backups. 

Answer 1

Hello @Rmentor Thank you for reaching out to us and sorry for the inconvenience caused to you.

The error message "Failed to freeze one or more mount-points of the VM to take a file-system consistent snapshot" typically indicates an issue with the snapshot process of Azure Backup for Linux VMs.

Suggest you follow the guidance below:

Look for logs, can provide you with more detailed information about what specifically failed during the backup process.

The logs are usually located in var log azurebackup directory on the Linux VM.

For Linux VMs, Azure Backup uses pre-freeze and post-thaw scripts to achieve snapshot consistency. Ensure that your Linux VM has the appropriate pre-freeze and post-thaw scripts configured correctly.

• Azure Backup uses scripts to quiesce the file system freeze before taking a snapshot and then resume normal operations thaw afterward.
• Check if the scripts pre freeze script and post thaw script are correctly configured and executable. These scripts should handle freezing and unfreezing any necessary applications or databases to ensure data consistency.
• Ensure that the account running the Azure Backup Agent has sufficient permissions to execute the pre-freeze and post-thaw scripts and to access all necessary files and directories.
• Verify that there are no network connectivity issues that could prevent the backup service from communicating with the VM or executing the necessary scripts.

Verify if there are any disk or file system issues on the Linux VM that could be affecting the backup process.

Run file system checks fsck to ensure the integrity of the file systems.

Ensure that there is enough free space on the VM's disks to accommodate the snapshot operation.

Reference link: https://learn.microsoft.com/en-us/azure/backup/backup-azure-vms-troubleshoot#usererrorfsfreezefailed---failed-to-freeze-one-or-more-mount-points-of-the-vm-to-take-a-file-system-consistent-snapshot

If the issue persists after checking the above steps, consider reaching out to Azure Support for further assistance. The ticket enables you to work closely with the support engineers and get a quick resolution to your issue.

Here is the link - https://docs.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request to create support case.

Hope this helps!

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