VM with libvirt

    Requirements:

    apt-get install qemu qemu-kvm libvirt-clients libvirt-daemon-system virtinst bridge-utils

    Build an image

    with Virt-builder

    Debian package: libguestfs-tools

    virt-builder debian-11 -o test.img --size 100G --root-password password:XXX --hostname test.parmentier.io --install "net-tools" --append-line '/etc/resolv.conf:nameserver 213.186.33.99'

    Notes:

    • you can use --firstboot-command 'apt-get install -y ...'
    • --append-line '/etc/hosts:192.168.225.1 server.ostechnix.local'

    source

    Install/Import an image

    Debian package: virtinst

    virt-install \
--name test.parmentier.io \
--ram 4096 \
--disk path=/var/lib/libvirt/images/test.img \
--vcpus 2 \
--os-variant debian10 \
--network bridge=br0,mac=xxx \
--graphics none \
--noautoconsole \
--boot hd \
--import

    Notes:

    • there is no --os-variant debian11 yet, but debian10 should be fine?
    • if you use a bridge network, ensure it is configured on host, and you might have to specify a virutal mac address (its the case for ovh vm within dedicated).

    source

    Start vm

    virsh --connect qemu:///system start test.parmentier.io

    Auto start

    virsh autostart test.parmentier.io

    Get into vm

    virsh console test.parmentier.io

    Edit configuration

    virsh edit test.parmentier.io

    Uninstall

    virsh shutdown test.parmentier.io
virsh undefine test.parmentier.io

    Network (host)

    On debian 11, ensure apt-get install -y bridge-utils:

    iface eno3 inet manual

auto br0
iface br0 inet static
    address xx/24
    gateway yyy
    bridge-ports eno3
    bridge-stp off
    bridge-fd 0
    hwaddress 0a:xx:00

    Note: on debian 11, without mac address, it did not work.

    Also, ensure you have ip_forward=1, you cna check value with sysctl net.ipv4.ip_forward, and edit with sysctl net.ipv4.ip_forward=1. To make it persistant: edit /etc/sysctl.conf, find the line ip_forward=, then run sysctl -p /etc/sysctl.conf.

    Network (vm)

    auto enp1s0
iface enp1s0 inet static
        address xx
        netmask 255.255.255.255
        broadcast xx
        post-up ip route add yy/32 dev enp1s0
        post-up ip route add default via yy
        pre-down ip route del yy/32 dev enp1s0
        pre-down ip route del default via yy

    Note: replace xx and yy