KVM cannot access files located on an external HDD. (SOLVED)- Community

KVM cannot access files located on an external HDD. (SOLVED)

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savanweylyn

deepin

2017-02-21 10:31

Author

Edited by savanweylyn at 2017-2-25 15:36

I have a 30 GB sytem partition for Deepin (on a 120 GB SSD) and a 500 GB external HDD (the old HDD of my laptop). The HDD has an EXT4 file system, and is mounted under /media/weylyn1/data, with the options: rw,nosuid,nodev,relatime,data=ordered. Whenever i try to access a file on it with kvm, i get an error message like this:

Cannot finish installation: 'internal error: process exited while connecting to monitor: 2017-02-20T18:21:45.968433Z qemu-system-x86_64: -drive file=/media/weylyn1/data/DOS71CD.ISO,format=raw,if=none,id=drive-ide0-0-1,readonly=on: Could not open '/media/weylyn1/data/DOS71CD.ISO': Permission denied'

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The result is the same if i chown the files on it as 119:128 (libvirt-qemu:libvirt-qemu), chown the whole drive, set permissions 777 on the specific file I need or 0777 for the whole drive. If i copy the images to /var/lib/libvirt or to /home/weylyn1, KVM can access them. I'd like to try out a few Linux distros (e.g. OpenSUSE or Fedora) that run really slow in other hypervisors like VirtualBox or VMware. Please help.

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tc25898

deepin

2017-02-21 11:50

你用sudo dde-file-manager开文件管理器后能打开该文件吗？

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laoguang

deepin

2017-02-21 18:23

maybe if you reboot you would have to chown again?

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savanweylyn

deepin

2017-02-22 07:04

https://bbs.deepin.org/post/135114
maybe if you reboot you would have to chown again?

I didn't need to chown anything after reboot. The owner and group remains qemu-kvm.

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savanweylyn

deepin

2017-02-22 07:05

https://bbs.deepin.org/post/135114
你用sudo dde-file-manager开文件管理器后能打开该文件吗？

I don't know Chinese.

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tc25898

deepin

2017-02-22 15:20

https://bbs.deepin.org/post/135114
I don't know Chinese.

Sorry.
You may try "sudo dde-file-manager" and see if you can access the file in that mounted partition.

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savanweylyn

deepin

2017-02-23 01:49

https://bbs.deepin.org/post/135114
Sorry.
You may try "sudo dde-file-manager" and see if you can access the file in that mounted par ...

I can access everything with this.

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laoguang

deepin

2017-02-24 19:51

just sudo -s?

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savanweylyn

deepin

2017-02-26 06:18

https://bbs.deepin.org/post/135114
just sudo -s?

Yes, the directory is accessible with sudo -s.
In the meantime I've managed to find the solution: i had to launch virt-manager as root (via gksudo virt-manager) and choose a disk image from that directory. The program complained that it doesn't have permissions to access that directory and asked wether i want to fix it or not. I choose 'Yes' and it has created the VM. After making sure that the VM is working, I closed it, started it as a normal user and now it's working. I've used it before and it was always asked wether i want it to fix permission issues or not while running it as single user, so I didn't tried to run it as root earlier.

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laoguang

deepin

2017-03-02 15:46

https://bbs.deepin.org/post/135114
Yes, the directory is accessible with sudo -s.
In the meantime I've managed to find the solution: ...

Deepin seems to have this kind of issue, the last time I tried to access isos from my hard drive(using deepin on usb), I encounter a similar issue. Maybe you can manual chmod the entire drive or alter the vm process group(adding to root?). Not sure if will persist after reboot though.

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savanweylyn

deepin

2017-03-03 08:26

#10