Fedora 31
Sponsored Link

KVM : Install VM Management Tools
2019/11/18
 
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-28                i686       Fedora 28 Server (i686)
fedora-28                x86_64     Fedora 28 Server
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
.....
.....

# create an image of fedora-31

[root@dlp ~]#
virt-builder fedora-31 --format qcow2 --size 10G -o /var/kvm/images/fedora-31.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-31.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-31 \
--ram 4096 \
--disk path=/var/kvm/images/fedora-31.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 fedora31 /root

total 28
dr-xr-x---.  2 root root  135 Nov 18 04:09 .
dr-xr-xr-x. 17 root root  224 Nov 18 03:57 ..
-rw-------.  1 root root   48 Nov 18 04:09 .bash_history
-rw-r--r--.  1 root root   18 Jul 27 02:32 .bash_logout
-rw-r--r--.  1 root root  176 Jul 27 02:32 .bash_profile
-rw-r--r--.  1 root root  176 Jul 27 02:32 .bashrc
-rw-r--r--.  1 root root  100 Jul 27 02:32 .cshrc
-rw-r--r--.  1 root root  129 Jul 27 02:32 .tcshrc
-rw-------.  1 root root 1382 Nov 18 04:01 anaconda-ks.cfg
[4] [cat] a file in a virtual machine.
[root@dlp ~]#
virt-cat -d fedora31 /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 fedora31 /etc/fstab


#
# /etc/fstab
# Created by anaconda on Mon Nov 18 03:56:43 2019
#
# 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-root /                       xfs     defaults        0 0
UUID=0216ed75-776d-465d-bef4-90657a74553d /boot xfs     defaults        0 0
/dev/mapper/fedora-swap none                    swap    defaults        0 0
[6] Display disk usage in a virtual machine.
[root@dlp ~]#
virt-df -d fedora31

Filesystem                           1K-blocks       Used  Available  Use%
fedora31:/dev/sda1                     1038336     145220     893116   14%
fedora31:/dev/fedora/root             15718400    1487552   14230848   10%
[7] Mount a disk for a virtual machine.
[root@dlp ~]#
guestmount -d fedora31 -i /media

[root@dlp ~]#
ll /media

total 16
lrwxrwxrwx.  1 root root    7 Jul 24 18:35 bin -> usr/bin
dr-xr-xr-x.  5 root root 4096 Nov 17 22:00 boot
drwxr-xr-x.  2 root root    6 Nov 17 21:56 dev
drwxr-xr-x. 95 root root 8192 Nov 17 22:07 etc
drwxr-xr-x.  3 root root   20 Nov 17 22:00 home
.....
.....
[8] Display the status of virtual machines.
[root@dlp ~]#
virt-top

virt-top 22:57:50 - x86_64 8/8CPU 2593MHz 12078MB
3 domains, 1 active, 1 running, 0 sleeping, 0 paused, 2 inactive D:0 O:0 X:0
CPU: 0.0%  Mem: 768 MB (768 MB by guests)
Matched Content