Azure Virtual Machines
An Azure service that is used to provision Windows and Linux virtual machines.
8,332 questions
"no medium found on /dev/hdc" error during Azure Linux VM startup
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Sam
0
Reputation points
We have a Linux VM image based on Yocto. The waagent is set up on the system. However, we got the "no medium found" error message during startup from waagent.log.
/dev/hdc seems to be the read-only DVD needed for provisioning, but I have no idea where it come from or why it is missing.
Any pointer on how to fix the error message are greatly appreciated.
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2025-02-04T20:24:12.688553Z WARNING Daemon Daemon Unable to load distro implementation for . Using default distro implementation instead.
2025-02-04T20:24:12.693311Z INFO Daemon Daemon Azure Linux Agent Version: 2.10.0.1
2025-02-04T20:24:12.695659Z INFO Daemon Daemon OS:
2025-02-04T20:24:12.697199Z INFO Daemon Daemon Python: 3.7.8
2025-02-04T20:24:12.698919Z INFO Daemon Daemon Run daemon
2025-02-04T20:24:12.700497Z WARNING Daemon Daemon Unable to load distro implementation for . Using default distro implementation instead.
2025-02-04T20:24:12.704072Z WARNING Daemon Daemon Unable to load distro implementation for . Using default distro implementation instead.
2025-02-04T20:24:12.707856Z WARNING Daemon Daemon Unable to load distro implementation for . Using default distro implementation instead.
2025-02-04T20:24:12.711486Z WARNING Daemon Daemon Unable to load distro implementation for . Using default distro implementation instead.
2025-02-04T20:24:12.715067Z INFO Daemon Daemon No RDMA handler exists for distro='' version=''
2025-02-04T20:24:12.718460Z INFO Daemon Daemon Unable to get cloud-init enabled status from systemctl: [Errno 2] No such file or directory: 'systemctl': 'systemctl'
2025-02-04T20:24:12.725688Z INFO Daemon Daemon Unable to get cloud-init enabled status from service: Command '['service', 'cloud-init', 'status']' returned non-zero exit status 1.
2025-02-04T20:24:12.730491Z INFO Daemon Daemon cloud-init is enabled: False
2025-02-04T20:24:12.732547Z INFO Daemon Daemon Using waagent for provisioning
2025-02-04T20:24:12.734627Z WARNING Daemon Daemon Unable to load distro implementation for . Using default distro implementation instead.
2025-02-04T20:24:12.738229Z WARNING Daemon Daemon Unable to load distro implementation for . Using default distro implementation instead.
2025-02-04T20:24:12.741989Z INFO Daemon Daemon Clean protocol and wireserver endpoint
2025-02-04T20:24:12.744362Z INFO Daemon Daemon Running default provisioning handler
2025-02-04T20:24:12.747293Z INFO Daemon Daemon Unable to get cloud-init enabled status from systemctl: [Errno 2] No such file or directory: 'systemctl': 'systemctl'
2025-02-04T20:24:12.753568Z INFO Daemon Daemon Unable to get cloud-init enabled status from service: Command '['service', 'cloud-init', 'status']' returned non-zero exit status 1.
2025-02-04T20:24:12.758680Z INFO Daemon Daemon cloud-init is enabled: False
2025-02-04T20:24:12.761034Z INFO Daemon Daemon Copying ovf-env.xml
2025-02-04T20:24:12.785295Z WARNING Daemon Daemon Mounting dvd failed [retry 1/5, sleeping 5 sec]
2025-02-04T20:24:17.812660Z WARNING Daemon Daemon Mounting dvd failed [retry 2/5, sleeping 5 sec]
2025-02-04T20:24:22.840115Z WARNING Daemon Daemon Mounting dvd failed [retry 3/5, sleeping 5 sec]
2025-02-04T20:24:27.868301Z WARNING Daemon Daemon Mounting dvd failed [retry 4/5, sleeping 5 sec]
2025-02-04T20:24:32.895865Z WARNING Daemon Daemon Mounting dvd failed [retry 5/5, sleeping 5 sec]
2025-02-04T20:24:37.904107Z ERROR Daemon Daemon Provisioning failed: [ProtocolError] [CopyOvfEnv] Error mounting dvd: [OSUtilError] Failed to mount dvd device
Inner error: [['mount', '-o', 'ro', '-t', 'udf,iso9660,vfat', '/dev/hdc', '/mnt/cdrom/secure']] returned 32:
stdout:
stderr: mount: /mnt/cdrom/secure: no medium found on /dev/hdc.
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anashetty 2,040 Reputation points Microsoft Vendor2025-02-05T06:15:57.14+00:00 Hi Sam,
Welcome to the Microsoft Q&A Platform! Thank you for asking your question here.The error message no medium found on /dev/hdc suggests that the provisioning DVD is missing or not attached properly.
First check if /dev/hdc is properly attached or not:ls -l /dev/hdcIf it is missing then VM does not have provisioned properly.
Try manually mounting the device to see if DVD is added.
See that you are using the latest version of the Azure Linux Agent, update it for better results.
You can modify the waagent configuration to skip the DVD mount step. Edit the waagent configuration file (usually located at/etc/waagent.conf) and restart the waagent service.If you have any further queries, please do let me know. If the information is helpful, please Upvote it.
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Sam 0 Reputation points
2025-02-05T22:01:45.64+00:00 I can see /dev/hdc in the system, but when I tried to manually mount it, I got the same error message.
root@cfv:/home/support# dmesg | grep hdc
[ 4.528755] hdc: Virtual CD, ATAPI CD/DVD-ROM drive
[ 5.464490] hdc: host max PIO4 wanted PIO255(auto-tune) selected PIO2
[ 5.464673] hdc: MWDMA2 mode selected
[ 5.483476] ide-cd: hdc: ATAPI DVD-ROM drive, 0kB Cache
(failed reverse-i-search)`mount': d^Csg | grep hdc
root@cfv:/home/support# mount -o ro -t udf,iso9660,vfat /dev/hdc /mnt/cdrom/secure
mount: /mnt/cdrom/secure: no medium found on /dev/hdc.
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anashetty 2,040 Reputation points Microsoft Vendor
2025-02-07T07:26:23.26+00:00 Hi Sam,
Thanks for getting back with detailed explanation. The "no medium found" error occurs when the Azure Linux Agent cannot find the virtual DVD containing the provisioning data.
See that the Yocto-based Linux VM image was properly prepared for Azure, please refer to this document Prepare Linux for imaging in Azure
Ensure that Azure Linux Agent is installed and configured correctly.
The logs indicate thatsystemctlandcloud-initare not found. Ensure that the necessary dependenciessystemd,cloud-initare installed in your Yocto image if required.
Update the Azure Linux Agent from here
The logs suggest that/dev/hdcis recognized as a virtual DVD drive but has no medium attached. check the kernel messages for/dev/hdcIf no medium is found, it confirms that the virtual DVD is not attached.
Once try testing with a known working Linux image. If the issue persists, it might be related to the Azure environment rather than the image.If you have any further queries, please let me know. If the information is helpful, please Upvote it.
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