Fedora 33
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KVM : Install VM Management Tools
2020/11/03
 
Install useful tools for virtual machine management.
[1] Install required packages.
[root@dlp ~]#
dnf -y install libguestfs-tools virt-top
[2] Create a Virtual machine from officially provided images.
# display available OS template

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

fedora-29                aarch64    Fedora® 29 Server (aarch64)
fedora-29                i686       Fedora® 29 Server (i686)
fedora-29                ppc64le    Fedora® 29 Server (ppc64le)
fedora-29                x86_64     Fedora® 29 Server
fedora-30                aarch64    Fedora® 30 Server (aarch64)
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
.....
.....

# create an image of fedora-33

[root@dlp ~]#
virt-builder fedora-33 --format qcow2 --size 10G -o /var/kvm/images/fedora-33.qcow2 --root-password password

[   3.7] Downloading: http://builder.libguestfs.org/fedora-31.xz
######################################################################## 100.0%
[ 193.5] Planning how to build this image
[ 193.5] Uncompressing
[ 199.0] Resizing (using virt-resize) to expand the disk to 10.0G
[ 242.4] Opening the new disk
[ 249.3] Setting a random seed
[ 249.4] Setting passwords
[ 250.9] Finishing off
                   Output file: /var/kvm/images/fedora-33.qcow2
                   Output size: 10.0G
                 Output format: qcow2
            Total usable space: 9.4G
                    Free space: 8.1G (86%)

# to create a VM with the image above, run [virt-install]

[root@dlp ~]#
virt-install \
--name fedora-33 \
--ram 4096 \
--disk path=/var/kvm/images/fedora-33.qcow2 \
--vcpus 2 \
--os-type linux \
--os-variant fedora30 \
--network bridge=br0 \
--graphics none \
--serial pty \
--console pty \
--boot hd \
--import
[3] [ls] a directory in a virtual machine.
[root@dlp ~]#
virt-ls -l -d fedora33 /root

total 28
dr-xr-x---.  2 root root  135 Nov  3 05:54 .
dr-xr-xr-x. 17 root root  224 Nov  3 05:48 ..
-rw-------.  1 root root   16 Nov  3 05:54 .bash_history
-rw-r--r--.  1 root root   18 Jul 29 21:34 .bash_logout
-rw-r--r--.  1 root root  141 Jul 29 21:34 .bash_profile
-rw-r--r--.  1 root root  429 Jul 29 21:34 .bashrc
-rw-r--r--.  1 root root  100 Jul 29 21:34 .cshrc
-rw-r--r--.  1 root root  129 Jul 29 21:34 .tcshrc
-rw-------.  1 root root 1257 Nov  3 05:52 anaconda-ks.cfg
[4] [cat] a file in a virtual machine.
[root@dlp ~]#
virt-cat -d fedora33 /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
operator:x:11:0:operator:/root:/sbin/nologin
.....
.....
[5] Edit a file in a virtual machine.
[root@dlp ~]#
virt-edit -d fedora33 /etc/fstab


#
# /etc/fstab
# Created by anaconda on Tue Nov  3 05:47:58 2020
#
# 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=5ac6a6d6-9d50-4588-b5e6-65b80d8d97a4 /boot        xfs     defaults        0 0
[6] Display disk usage in a virtual machine.
[root@dlp ~]#
virt-df -d fedora33

Filesystem                           1K-blocks       Used  Available  Use%
fedora33:/dev/sda1                     1038336     163000     875336   16%
fedora33:/dev/fedora_fedora/root      15718400    1592824   14125576   11%
[7] Mount a disk for a virtual machine.
[root@dlp ~]#
guestmount -d fedora33 -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 15:57:10 - x86_64 6/6CPU 2593MHz 11973MB
2 domains, 1 active, 1 running, 0 sleeping, 0 paused, 1 inactive D:0 O:0 X:0
CPU: 0.0%  Mem: 1280 MB (1280 MB by guests)
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