Rocky_Linux_8
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KVM : Install VM Management Tools2021/07/27

 
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

opensuse-13.1            x86_64     openSUSE 13.1
opensuse-13.2            x86_64     openSUSE 13.2
opensuse-42.1            x86_64     openSUSE Leap 42.1
opensuse-tumbleweed      x86_64     openSUSE Tumbleweed
centos-6                 x86_64     CentOS 6.6
centos-7.0               x86_64     CentOS 7.0
centos-7.1               x86_64     CentOS 7.1
centos-7.2               aarch64    CentOS 7.2 (aarch64)
centos-7.2               x86_64     CentOS 7.2
centos-7.3               x86_64     CentOS 7.3
centos-7.4               x86_64     CentOS 7.4
centos-7.5               x86_64     CentOS 7.5
centos-7.6               x86_64     CentOS 7.6
centos-7.7               x86_64     CentOS 7.7
centos-7.8               x86_64     CentOS 7.8
centos-8.0               x86_64     CentOS 8.0
centos-8.2               x86_64     CentOS 8.2
cirros-0.3.1             x86_64     CirrOS 0.3.1
cirros-0.3.5             x86_64     CirrOS 0.3.5
debian-10                x86_64     Debian 10 (buster)
.....
.....

# create an image of fedora-34

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

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

[   5.9] Downloading: http://builder.libguestfs.org/fedora-34.xz
[ 143.5] Planning how to build this image
[ 143.5] Uncompressing
[ 147.7] Resizing (using virt-resize) to expand the disk to 10.0G
[ 185.3] Opening the new disk
[ 191.3] Setting a random seed
[ 191.3] Setting passwords
[ 192.6] 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 fedora33 \
--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 rocky8 /root

total 32
dr-xr-x---.  2 root root  163 Jul 27 02:48 .
dr-xr-xr-x. 17 root root  224 Jul 27 02:37 ..
-rw-------.  1 root root   16 Jul 27 02:48 .bash_history
-rw-r--r--.  1 root root   18 Mar 14 19:35 .bash_logout
-rw-r--r--.  1 root root  176 Mar 14 19:35 .bash_profile
-rw-r--r--.  1 root root  176 Mar 14 19:35 .bashrc
-rw-r--r--.  1 root root  100 Mar 14 19:35 .cshrc
-rw-r--r--.  1 root root  129 Mar 14 19:35 .tcshrc
-rw-------.  1 root root 1352 Jul 27 02:46 anaconda-ks.cfg
-rw-r--r--.  1 root root 1628 Jul 27 02:48 initial-setup-ks.cfg
[4] [cat] a file in a virtual machine.
[root@dlp ~]#
virt-cat -d rocky8 /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 rocky8 /etc/fstab


#
# /etc/fstab
# Created by anaconda on Tue Jul 27 02:35:49 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/rl-root     /                       xfs     defaults        0 0
UUID=57c6e2db-5fd3-4f5f-a55e-0b30b5124a7b /boot xfs     defaults        0 0
/dev/mapper/rl-swap     none                    swap    defaults        0 0
[6] Display disk usage in a virtual machine.
[root@dlp ~]#
virt-df -d rocky8

Filesystem                           1K-blocks       Used  Available  Use%
rocky8:/dev/sda1                       1038336     208192     830144   21%
rocky8:/dev/rl/root                   17811456    4294372   13517084   25%
[7] Mount a disk for a virtual machine.
[root@dlp ~]#
guestmount -d rocky8 -i /media

[root@dlp ~]#
ll /media

total 24
lrwxrwxrwx.   1 root root    7 Mar 15 04:28 bin -> usr/bin
dr-xr-xr-x.   5 root root 4096 Jul 27 11:47 boot
drwxr-xr-x.   2 root root    6 Jul 27 11:35 dev
drwxr-xr-x. 140 root root 8192 Jul 27 11:48 etc
drwxr-xr-x.   3 root root   19 Jul 27 11:46 home
.....
.....
[8] Display the status of virtual machines.
[root@dlp ~]#
virt-top

virt-top 12:36:30 - x86_64 8/8CPU 2593MHz 15831MB
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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