Fedora 34
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KVM : Install VM Management Tools
2021/05/11
 
Install useful tools for virtual machine management.
[1] Install required packages.
[root@dlp ~]#
dnf -y install guestfs-tools virt-top
[2] Create a Virtual machine from officially provided images.
# display available OS template

[root@dlp ~]#
virt-builder -l

fedora-30                i686       Fedora 30 Server (i686)
fedora-30                x86_64     Fedora 30 Server
fedora-31                x86_64     Fedora 31 Server
fedora-32                x86_64     Fedora 32 Server
fedora-33                x86_64     Fedora 33 Server
fedora-34                x86_64     Fedora 34 Server
.....
.....

# create an image of fedora-34

[root@dlp ~]#
virt-builder fedora-34 --format qcow2 --size 10G -o /var/kvm/images/fedora-34.qcow2 --root-password password:myrootpassword

[   6.0] Downloading: http://builder.libguestfs.org/fedora-34.xz
######################################################################## 100.0%
[ 337.3] Planning how to build this image
[ 337.3] Uncompressing
[ 341.9] Resizing (using virt-resize) to expand the disk to 10.0G
[ 378.9] Opening the new disk
[ 384.6] Setting a random seed
[ 384.7] Setting passwords
[ 385.9] Finishing off
                   Output file: /var/kvm/images/fedora-34.qcow2
                   Output size: 10.0G
                 Output format: qcow2
            Total usable space: 10.0G
                    Free space: 9.0G (90%)

# to create a VM with the image above, run [virt-install]
[root@dlp ~]# virt-install \
--name fedora-34 \
--ram 4096 \
--disk path=/var/kvm/images/fedora-34.qcow2 \
--vcpus 2 \
--os-variant fedora34 \
--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 fedora-34
[3] [ls] a directory in a virtual machine.
[root@dlp ~]#
virt-ls -l -d fedora34 /root

total 28
dr-xr-x---.  3 root root 149 May 11 02:18 .
dr-xr-xr-x. 17 root root 224 May 11 02:03 ..
-rw-------.  1 root root  76 May 11 02:19 .bash_history
-rw-r--r--.  1 root root  18 Jan 28 11:17 .bash_logout
-rw-r--r--.  1 root root 141 Jan 28 11:17 .bash_profile
-rw-r--r--.  1 root root 429 Jan 28 11:17 .bashrc
drwxr-xr-x.  3 root root  23 May 11 02:18 .cache
-rw-r--r--.  1 root root 100 Jan 28 11:17 .cshrc
-rw-r--r--.  1 root root 129 Jan 28 11:17 .tcshrc
-rw-------.  1 root root 900 May 11 02:07 anaconda-ks.cfg
[4] [cat] a file in a virtual machine.
[root@dlp ~]#
virt-cat -d fedora34 /etc/passwd

root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
.....
.....
[5] Edit a file in a virtual machine.
[root@dlp ~]#
virt-edit -d fedora34 /etc/fstab


#
# /etc/fstab
# Created by anaconda on Tue May 11 02:02:41 2021
#
# Accessible filesystems, by reference, are maintained under '/dev/disk/'.
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info.
#
# After editing this file, run 'systemctl daemon-reload' to update systemd
# units generated from this file.
#
/dev/mapper/fedora_fedora-root /                       xfs     defaults        0 0
UUID=8fdac9c3-a203-4d73-a43b-0554e6f35e53 /boot        xfs     defaults        0 0
[6] Display disk usage in a virtual machine.
[root@dlp ~]#
virt-df -d fedora34

Filesystem                           1K-blocks       Used  Available  Use%
fedora34:/dev/sda1                     1038336     150168     888168   15%
fedora34:/dev/fedora_fedora/root      15718400    3492884   12225516   23%
[7] Mount a disk for a virtual machine.
[root@dlp ~]#
guestmount -d fedora34 -i /media

[root@dlp ~]#
ll /media

total 16
lrwxrwxrwx.  1 root root    7 Jul 28 03:22 bin -> usr/bin
dr-xr-xr-x.  5 root root 4096 Nov  3 14:51 boot
drwxr-xr-x.  2 root root    6 Nov  3 14:47 dev
drwxr-xr-x. 99 root root 8192 Nov  3 14:53 etc
drwxr-xr-x.  3 root root   20 Nov  3 14:51 home
.....
.....
[8] Display the status of virtual machines.
[root@dlp ~]#
virt-top

virt-top 23:46:08 - x86_64 8/8CPU 2593MHz 16002MB
2 domains, 0 active, 0 running, 0 sleeping, 0 paused, 2 inactive D:0 O:0 X:0
CPU: 0.0%  Mem: 0 MB (0 MB by guests)
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