createvm

#!/bin/sh
# ----- config-block { -----
VCPUS=1
# RAM size in MiB
RAM_SIZE=512
DISK_SIZE=5G
DEFAULT_USER='user'
DEFAULT_PASSWD='pass'
# ----- } config-block -----

VM_ID=$1
IP_NUMBER=$2

CMD=`basename $0`
if [ -z "$VM_ID" ]; then
    echo "VM_ID not specified."
    echo "Usage: $CMD <VM_ID> [<IP_NUMBER>]\n"
    echo "  <VM_ID> - VM identifier, used also as hostname."
    echo "  <IP_NUMBER> - last segment of IP-address from default KVM network."
    exit 1
fi


PUB_KEY=$(cat ~/.ssh/id_rsa.pub)
PASSWD_HASH=`openssl passwd -6 $DEFAULT_PASSWD`

mkdir -p /tmp/$VM_ID

sudo cat > /tmp/$VM_ID/user-data <<EOF
#cloud-config
hostname: $VM_ID
users:
  - name: $DEFAULT_USER
    ssh-authorized-keys:
      - $PUB_KEY
    sudo: ['ALL=(ALL) NOPASSWD:ALL']
    groups: sudo
    passwd: "$PASSWD_HASH"
    lock_passwd: false
    shell: /bin/bash
runcmd:
  - echo "AllowUsers $DEFAULT_USER" >> /etc/ssh/sshd_config
  - restart ssh
EOF

if [ $IP_NUMBER ]; then
    sudo cat > /tmp/$VM_ID/network-config <<EOF
version: 2
ethernets:
  enp1s0:
    addresses:
      - 192.168.122.$IP_NUMBER/24
    gateway4: 192.168.122.1
    nameservers:
      addresses: 
        - 192.168.122.1
        - 1.1.1.1
        - 8.8.8.8
EOF
    NETWORK_CONFIG="--network-config=/tmp/$VM_ID/network-config"
fi

echo "Cloud-init files for $VM_ID created."

sudo mkdir -p /var/lib/libvirt/images/$VM_ID

sudo qemu-img create -f qcow2 -F qcow2 -o backing_file=/var/lib/libvirt/images/base/ubuntu-22.04.qcow2 /var/lib/libvirt/images/$VM_ID/$VM_ID.qcow2

sudo qemu-img resize /var/lib/libvirt/images/$VM_ID/$VM_ID.qcow2 $DISK_SIZE

# Create seed disk with cloud-init data
sudo cloud-localds -v /var/lib/libvirt/images/$VM_ID/$VM_ID-seed.qcow2 $NETWORK_CONFIG /tmp/$VM_ID/user-data

rm -r /tmp/$VM_ID

sudo virt-install --connect qemu:///system --virt-type kvm --name $VM_ID \
--memory $RAM_SIZE --vcpus=$VCPUS --os-variant ubuntu22.04 \
--disk path=/var/lib/libvirt/images/$VM_ID/$VM_ID.qcow2,format=qcow2 \
--disk path=/var/lib/libvirt/images/$VM_ID/$VM_ID-seed.qcow2,format=qcow2 \
--import --network network=default --noautoconsole