[Users] cannot enter VM VZ7 , qemu-guest-agent. fails

[Jehan Procaccia]

hello

after creating a VM based on the doc: 
https://docs.openvz.org/openvz_users_guide.webhelp/_creating_virtual_machines.html 
:

prlctl create thd-dhcpntp --distribution centos7 --vmtype vm
prlctl installtools dhcpntp
prlctl set dhcpntp --device-set net0 --ipadd 10.10.10.10/24
prlctl set dhcpntp --nameserver 10.10.10.1


if finally try to enter it, but it fails :

# prlctl enter dhcpntp
Operation failed. Failed to execute the operation. (Details: Guest agent 
is not responding: QEMU guest agent is not connected)

after searchs, I deducted that I need qemu-guest-agent, so installed 
itwith yum (qemu-guest-agent-2.3.0-4.vl7.1.x86_64
)
but qemu-guest-agent cannot start

# systemctl start qemu-guest-agent.service
A dependency job for qemu-guest-agent.service failed. See 'journalctl 
-xe' for details.

# systemctl status qemu-guest-agent.service
qemu-guest-agent.service - QEMU Guest Agent
    Loaded: loaded (/usr/lib/systemd/system/qemu-guest-agent.service; 
enabled; vendor preset: enabled)
    Active: inactive (dead)

journalctl -f :

août 27 17:17:31 thd-vz1 systemd[1]: Dependency failed for QEMU Guest Agent.
août 27 17:17:31 thd-vz1 systemd[1]: Job qemu-guest-agent.service/start 
failed with result 'dependency'.

août 27 17:56:18 vz1 systemd[1]: Job 
dev-virtio\x2dports-org.qemu.guest_agent.0.device/start timed out.
août 27 17:56:18 vz1 systemd[1]: Timed out waiting for device 
dev-virtio\x2dports-org.qemu.guest_agent.0.device.
août 27 17:56:18 vz1 systemd[1]: Dependency failed for QEMU Guest Agent.
août 27 17:56:18 vz1 systemd[1]: Job qemu-guest-agent.service/start 
failed with result 'dependency'.
août 27 17:56:18 vz1 systemd[1]: Job 
dev-virtio\x2dports-org.qemu.guest_agent.0.device/start failed with 
result 'timeout'.
août 27 17:56:18 vz1 polkitd[841]: Unregistered Authentication Agent for 
unix-process:12814:241254 (system bus name :1.32, object path 
/org/freedesktop/PolicyKit1/AuthenticationAgent, locale fr_FR.UTF-8) 
(disconnected from bus)

I am surprised that the virtuozzo installation ISO doesn't include 
qemu-guest-agent if it is needed (?)
what could be wrong here ?

regards.

Ps: my versions

# cat /etc/redhat-release
Virtuozzo Linux release 7.2
# uname -a
Linux vz1 3.10.0-327.18.2.vz7.15.2 #1 SMP Fri Jul 22 14:48:06 MSK 2016 
x86_64 x86_64 x86_64 GNU/Linux