[one-users] Host directory sharing with KVM VM's

[Maxim Mikheev]

Hi Everyone,

There are lack of information how to use 9p on KVM. I finally made it 
work! Here is how:

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  On host:

1. modify /etc/libvirt/qemu.conf change owner and group to which will be 
used for starting KVM. The description how to use user/group at the end.
in my case I used oneadmin:cloud
and change security_driver to "none"

2. sudo touch /etc/apparmor.d/disable/usr.sbin.libvirtd

I was not able to modify apparmor. in theory need to add lines like:
/path/to/media/ rw,
/path/to/media/** rw,
to file:  /etc/apparmor.d/abstractions/libvirt-qemu
but it doesn't work in my case. I will be happy if someone will give an 
advice how to setup apparmor.

3. in OpenNebula Template add:
RAW=[
  DATA=" <devices><filesystem type='mount' accessmode='mapped'> <source 
dir=**/path/to/media/on/host**'/> <target dir='VirtFS'/> </filesystem> 
</devices>",
  TYPE=kvm ]
***
*"target dir"* is anything which will be used for mounting. In this 
example "VirtFS"
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4. change user/group for shared folder:
sudo chown -R **oneadmin:cloud **/path/to/media/on/host**


  in VM's

1. sudo apt-get install linux-image-extra-virtual
2. create folder and setup correct user/group
sudo mkdir /srv/vfs
sudo chown -R max:maxgroup /srv/vfs

3. and add line to /etc/fstab
VirtFS/srv/data9ptrans=virtio,version=9p2000.L00

4. you can mount manually
sudo mount -t 9p -otrans=virtio,version=9p2000.L VirtFS/srv/vfs

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How it is works:
After mounting the system will map user/group which used for mounting 
point (here is *max:maxgroup) with user/group for kvm process 
(oneadmin:cloud).

Inside VM user oneadmin (from host) will be shown as max, similar 
conversion with groups. All other groups will not be changed

Hope it will be helpful.
    Max

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