CentOS 8
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KVM : Install
2019/10/08
 
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 ~]#
dnf -y install qemu-kvm libvirt virt-install
# confirm modules are loaded

[root@dlp ~]#
lsmod | grep kvm

kvm_intel             245760  0
kvm                   745472  1 kvm_intel
irqbypass              16384  1 kvm

[root@dlp ~]#
systemctl enable --now libvirtd

[2] Configure Bridge networking for KVM virtual machines.
Replace the interface name [ens2] for your own environment.
# add bridge [br0]

[root@dlp ~]#
nmcli connection add type bridge autoconnect yes con-name br0 ifname br0

Connection 'br0' (a7fa989a-798e-40ac-acc4-3d1733189b82) successfully added.
# set IP address for [br0]

[root@dlp ~]#
nmcli connection modify br0 ipv4.addresses 10.0.0.30/24 ipv4.method manual

# set Gateway for [br0]

[root@dlp ~]#
nmcli connection modify br0 ipv4.gateway 10.0.0.1

# set DNS for [br0]

[root@dlp ~]#
nmcli connection modify br0 ipv4.dns 10.0.0.1

# remove the current interface

[root@dlp ~]#
nmcli connection del ens2

# add the removed interface again as a member of [br0]

[root@dlp ~]#
nmcli connection add type bridge-slave autoconnect yes con-name ens2 ifname ens2 master br0

# restart

[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: ens2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 52:54:00:d8:f8:61 brd ff:ff:ff:ff:ff:ff
3: br0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:d8:f8:61 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.30/24 brd 10.0.0.255 scope global noprefixroute br0
       valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:49:9a:ef brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 state DOWN group default qlen 1000
    link/ether 52:54:00:49:9a:ef brd ff:ff:ff:ff:ff:ff
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