Azure VM - Adding data disk to Linux VM - Unexpected mounting points

Question

• Scenario – I'm try to add a data disk to an existing Linux VM but after reboot the mounting point are both /bitnami and the one specified in /etc/fstab. What can i do to avoid the automatic mounting on /bitnami directory?
• Technology – Using a prebuilt bitnami Nginx / PHP-fpm virtual machine based on Debian 11.
• Result – The datadisk is being mounted in two different directory.
• Environment - This problem is encountered with a couple of our Wordrpess VM, deployed via hte Bitnami image from the Resource libraries. The VM OS is Debian 11 with a Ngix / PHP-fpm web server.
• Things you’ve tried: I have followd this guide https://learn.microsoft.com/en-us/azure/virtual-machines/linux/attach-disk-portal?tabs=ubuntu
  I have tried the same procedure in a fresher VM and it have the same problem.
• Screenshot/screencast: Screenshot of the steps: Attached the disk from the VM management portal Add the disk in the /etc/fstab file
• Reboot the machine
• Give reproducible steps: The documentation followed is the official one https://learn.microsoft.com/en-us/azure/virtual-machines/linux/attach-disk-portal?tabs=ubuntu and the problem was encountered event in a fresher VM deploied only a couple of weeks agoo.

Answer 1

@Vito Pastrello

I was able to reproduce this issue by utilizing the same Bitnami image. The Bitnami daemon appears to be automatically mounting /dev/sdc1 when an ext4 file system is available. I confirmed that when I disable bitnami by running "systemctl disable bitnami" the /bitnami directory does not automatically get remounted on reboot. I am thinking that likely the issue is one of the script in "/opt/bitnami/scripts" but I was not able to pinpoint which script.

Since this is not an image created or maintained by Azure I recommend reaching out to Bitnami for further assistance. You can file an issue on this GitHub page.

Alternatively, I found that if I created an xfs filesystem for /dev/sdc1 instead of ext4 it was not automatically mounting the directory.

Hope this helps! Let me know if you need anything else.

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