Mount VHDz via webconsole or CLI

I’m using urbackup server on CentOS Linux 7.8.2003 with Kernel: Linux 3.10.0-1127.19.1.el7.x86_64 on x86_64. I know about Btrfs problems with earlier kernels, but this version seems to be ok. I installed urbackup-server using yum from urbackup repo.

First I had not visible Mount Image button but I solved this by changing DAEMON_TMPDIR= in etc/sysconfig/urbackup-server file. So urbackup_mount_helper says OK after test command.

But when I use mount image button i recive an error after long waiting time:

So checking log:

2020-09-29 13:41:23: VHD-Parent: “/backups/urbackup/xxx/200926-1308_Image_C/Image_C_200926-1308.vhdz”
2020-09-29 13:41:31: ERROR: Image mounting failed: Loading FUSE kernel module…
sh: modprobe: command not found
Starting VHD background process…
Waiting for background process to become available…
libguestfs: error: could not create appliance through libvirt.

Try running qemu directly without libvirt using this environment variable:

Original error from libvirt: internal error: process exited while connecting to monitor: libvirt: error : cannot execute binary /usr/libexec/qemu-kvm: Permission denied [code=1 int1=-1]
Mounting failed.
UrBackup mount process returned non-zero return code


2020-09-29 13:41:04: Mounting VHD via fuse…
2020-09-29 13:41:04: VHD-Parent: “/backups/urbackup/DEL902-508/200926-1308_Image_C/Image_C_200926-1308.vhdz”
2020-09-29 13:41:04: Volume offset is 524288 bytes. Configure via --offset

And i see mount process remains in the system, and i have too kill it by hand

Libguestfs-test-tool says OK too…

What am I doing wrong? And what I have to do to make image mount work?