😏 The Basics of KVM

1virsh nodeinfo

1sudo ip link add virbr1 type bridge
2sudo ip link set eno1 up
3sudo ip link set eno1 master virbr1
4sudo ip address add dev virbr1 192.168.2.1/24

1sudo nmcli con add ifname virbr1 type bridge con-name virbr1
2sudo nmcli con add type bridge-slave ifname eno1 master virbr1
3sudo nmcli con modify virbr1 bridge.stp no
4sudo nmcli con down eno1
5sudo nmcli con up virbr1
6sudo ip address add dev virbr1 192.168.123.1/24

 1cat > hostbridge.xml << EOF
 2<network>
 3  <name>hostbridge</name>
 4  <forward mode='bridge'/>
 5  <bridge name='virbr1'/>
 6</network> 
 7EOF
 8
 9sudo virsh net-define hostbridge.xml
10sudo virsh net-start hostbridge
11sudo virsh net-autostart hostbridge

1echo "allow all" | sudo tee /etc/qemu-kvm/${USER}.conf
2echo "include /etc/qemu-kvm/${USER}.conf" | sudo tee --append /etc/qemu/bridge.conf
3sudo chown root:${USER} /etc/qemu-kvm/${USER}.conf
4sudo chmod 640 /etc/qemu-kvm/${USER}.conf

1sudo nmcli con show --active
2sudo virsh net-list --all
3sudo virsh net-edit hostbridge
4sudo virsh net-info hostbridge
5sudo virsh net-dhcp-leases hostbridge

 1echo -e "\n##### KVM networks #####\n"
 2kvm_system_networks_all=$(sudo virsh net-list --all)
 3echo -e "Available KVM networks in qemu:///system :\n$kvm_system_networks_all"
 4for net in $(sudo virsh net-list --name); do
 5    bridge_name=$(sudo virsh net-info --network ${net} | grep Bridge | cut -d":" -f2 | sed 's/^[[:space:]]*//')
 6    for br in ${bridge_name}; do
 7        br_info=$(ip -br -c address show dev ${br} || echo "No IP address assigned to bridge ${br}")
 8    done
 9    echo -e "\n\033[1;34m${net}\033[0m have the Bridge: $br_info"
10done
11echo -e "\n"

1brctl show

 1virt-install \
 2--name pfsense --ram 2048 --vcpus 2 \
 3--disk $HOME/pfsense/disk0.qcow2,size=12,format=qcow2 \
 4--autostart \
 5--cdrom $HOME/pfsense/netgate-installer-amd64.iso \
 6--network bridge=virbr0,model=e1000 \
 7--network network=hostbridge,model=e1000 \
 8--graphics vnc,listen=0.0.0.0 --noautoconsole \
 9--osinfo freebsd14.0 \
10--debug

1sudo virsh net-destroy hostbridge
2sudo virsh net-undefine hostbridge
3sudo nmcli con del virbr1
4sudo nmcli con del eno1