Debian 11 Bullseye
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KVM : Install
2021/08/27
 
It's Virtualization with KVM ( Kernel-based Virtual Machine ) + QEMU.
It requires that the CPU on your computer that has a feature Intel VT or AMD-V.
[1] Install required packages.
root@dlp:~#
apt -y install qemu-kvm libvirt-daemon-system libvirt-daemon virtinst bridge-utils libosinfo-bin
# confirm modules are loaded

root@dlp:~#
lsmod | grep kvm

kvm_intel             327680  0
kvm                   917504  1 kvm_intel
irqbypass              16384  1 kvm
[2] Configure Bridge networking for KVM virtual machines.
root@dlp:~#
ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:0c:48:f6 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.30/24 brd 10.0.0.255 scope global enp1s0
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe0c:48f6/64 scope link
       valid_lft forever preferred_lft forever

root@dlp:~#
vi /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug enp1s0
# change existing setting like follows
iface enp1s0 inet manual
#address 10.0.0.30
#network 10.0.0.0
#netmask 255.255.255.0
#broadcast 10.0.0.255
#gateway 10.0.0.1
#dns-nameservers 10.0.0.10

# add bridge interface setting
# for [hwaddress] line, specify the same MAC address with physical one ([enp1s0] on this example)
# set this param explicitly if different MAC address is assigned to bridge ingterface
auto br0
iface br0 inet static
address 10.0.0.30
network 10.0.0.0
netmask 255.255.255.0
broadcast 10.0.0.255
gateway 10.0.0.1
dns-nameservers 10.0.0.10
bridge_ports enp1s0
bridge_stp off
hwaddress ether 52:54:00:0c:48:f6

root@dlp:~#
root@dlp:~#
ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP group default qlen 1000
    link/ether 52:54:00:0c:48:f6 brd ff:ff:ff:ff:ff:ff
3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 52:54:00:0c:48:f6 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.30/24 brd 10.0.0.255 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::5099:e3ff:feec:59a3/64 scope link
       valid_lft forever preferred_lft forever
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