On 4/29/19 5:42 PM, lameventanas@gmail.com wrote:
On 29/04/2019 22.01, Michal Privoznik wrote:
On 4/29/19 1:06 PM, lameventanas@gmail.com wrote:
I want to run libvirtd as a special user, and allowing users that belong to a special group to connect via qemu+unix:///system (eg: unix socket).
I did everything necessary to do so: created a libvirt user and group, added the libvirt user to the kvm group, added my normal user to the libvirt group, and made sure the socket is owned by libvirt:libvirt with permissions set to 770.
libvirtd starts successfully, but when I try to connect as the normal user I get this error:
bash$ virsh --connect qemu+unix://system error: failed to connect to the hypervisor error: invalid argument: using unix socket and remote server 'system' is not supported.
This is not valid URI.
You may want to use 'qemu+unix:///system' or simply 'qemu:///system' which is the same because libvirt connects via unix socket by default.
Thanks, I missed that.
Now I get this:
$ virsh --connect qemu:///system error: failed to connect to the hypervisor error: internal error: unexpected QEMU URI path '/system', try qemu:///session
But now I see virsh opening the socket, writing, etc.
The server log shows this:
2019-04-29 15:32:07.306+0000: 20863: info : libvirt version: 5.2.0 2019-04-29 15:32:07.306+0000: 20863: info : hostname: koji 2019-04-29 15:32:07.306+0000: 20863: error : virDBusGetSessionBus:169 : internal error: Unable to get DBus session bus connection: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11 2019-04-29 15:32:24.534+0000: 20852: error : qemuConnectOpen:1127 : internal error: unexpected QEMU URI path '/system', try qemu:///session 2019-04-29 15:32:24.534+0000: 20851: error : virNetSocketReadWire:1803 : End of file while reading data: Input/output error
I also wonder if dbus is important, and if so, how to fix it.
This happened because qemu driver for /system doesn't initialize unless libvirtd's EUID == 0.
Anyway, you'll need to run libvirtd privileged, otherwise it'll get EPERM when trying to do almost anything.
I'm aware of that, I want to try and see the limitations, and maybe get around them by using capabilities?
Is there any problem running libvirtd as root? Michal