Debian 11 Bullseye
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KVM : Install VM Management Tools2021/08/27

 
Install useful tools for virtual machine management.
[1] Install required packages.
root@dlp:~#
apt -y install libguestfs-tools
[2] Create a Virtual machine from officially provided images.
# display available OS template

root@dlp:~#
virt-builder -l

.....
.....
debian-10                x86_64     Debian 10 (buster)
debian-6                 x86_64     Debian 6 (Squeeze)
debian-7                 sparc64    Debian 7 (Wheezy) (sparc64)
debian-7                 x86_64     Debian 7 (wheezy)
debian-8                 x86_64     Debian 8 (jessie)
debian-9                 x86_64     Debian 9 (stretch)
.....
.....

# create an image of Debian 10

replace the [myrootpassword] to the root password you'd like to set

root@dlp:~#
virt-builder debian-10 --format qcow2 --size 10G -o /var/kvm/images/debian-10.qcow2 --root-password password:myrootpassword

[   7.2] Downloading: http://builder.libguestfs.org/debian-10.xz
[ 109.4] Planning how to build this image
[ 109.4] Uncompressing
[ 113.7] Resizing (using virt-resize) to expand the disk to 10.0G
[ 137.2] Opening the new disk
[ 140.7] Setting a random seed
virt-builder: warning: random seed could not be set for this type of guest
[ 140.8] Setting passwords
[ 141.6] Finishing off
                   Output file: /var/kvm/images/debian-10.qcow2
                   Output size: 10.0G
                 Output format: qcow2
            Total usable space: 9.8G
                    Free space: 8.9G (90%)

# to create a VM with the image above, run [virt-install]
root@dlp:~# virt-install \
--name debian-10 \
--ram 4096 \
--disk path=/var/kvm/images/debian-10.qcow2 \
--vcpus 2 \
--os-variant debian10 \
--network bridge=br0 \
--graphics none \
--noautoconsole \
--boot hd \
--noreboot \
--import 

Starting install...
Domain creation completed.
You can restart your domain by running:
  virsh --connect qemu:///system start debian-10
[3] [ls] a directory in a virtual machine.
root@dlp:~#
virt-ls -l -d debian11 /root

total 24
drwx------  3 0 0 4096 Aug 27 00:30 .
drwxr-xr-x 19 0 0 4096 Aug 27 00:25 ..
-rw-------  1 0 0   16 Aug 27 00:30 .bash_history
-rw-r--r--  1 0 0  571 Apr 10 20:00 .bashrc
drwx------  2 0 0 4096 Aug 27 00:29 .cache
-rw-r--r--  1 0 0  161 Jul  9  2019 .profile
[4] [cat] a file in a virtual machine.
root@dlp:~#
virt-cat -d debian11 /etc/passwd

root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
.....
.....
[5] Edit a file in a virtual machine.
root@dlp:~#
virt-edit -d debian11 /etc/fstab


# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# systemd generates mount units based on this file, see systemd.mount(5).
# Please run 'systemctl daemon-reload' after making changes here.
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
/dev/mapper/debian--vg-root /                    ext4    errors=remount-ro 0       1
# /boot was on /dev/vda1 during installation
UUID=61e4e763-4804-4894-8a09-a6756cde4080 /boot  ext2    defaults          0       2
/dev/mapper/debian--vg-swap_1 non   swap    sw              0       0
/dev/sr0        /media/cdrom0   udf,iso9660 user,noauto     0       0
[6] Display disk usage in a virtual machine.
root@dlp:~#
virt-df -d debian11

Filesystem                           1K-blocks       Used  Available  Use%
debian11:/dev/sda1                      480618      61883     393801   13%
debian11:/dev/debian-vg/root          18982140    3811780   14180768   21%
[7] Mount a disk for a virtual machine.
root@dlp:~#
guestmount -d debian11 -i /mnt

root@dlp:~#
ll /mnt

total 81
lrwxrwxrwx   1 root root     7 Aug 26 19:18 bin -> usr/bin
drwxr-xr-x   4 root root  1024 Aug 26 19:27 boot
drwxr-xr-x   4 root root  4096 Aug 26 19:18 dev
drwxr-xr-x 118 root root 12288 Aug 26 19:29 etc
drwxr-xr-x   3 root root  4096 Aug 26 19:27 home
lrwxrwxrwx   1 root root    30 Aug 26 19:19 initrd.img -> boot/initrd.img-5.10.0-8-amd64
.....
.....
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