Quickly create Debian VMs on Linux

mkvm.sh

#!/bin/bash

NAME="$1"
TYPE="$2"

usage() {
        echo "usage: mkvm.sh name type"
        echo ""
        echo "  name:    user-defined name for the vm"
        echo "  type:    (nano,micro,small,medium,large,xlarge,2xlarge)"
        echo ""
        echo "  type   vcpus   ram   disk"
        echo "  -------------------------"
        echo "  nano       1  512M     4G"
        echo "  micro      1    1G     8G"
        echo "  small      1    2G    16G"
        echo "  medium     2    4G    32G"
        echo "  large      4    8G    64G"
        echo "  xlarge     8   16G   128G"
        echo "  2xlarge   16   32G   256G"
        echo ""
}

if [[ "$NAME" == "" || "$NAME" == "-h" ]]; then
        usage
        exit 1
fi


if [ "$TYPE" == "nano" ]; then
        opts="--vcpus=1 --memory=512 --disk size=4"
elif [ "$TYPE" == "micro" ]; then
        opts="--vcpus=1 --memory=1024 --disk size=8"
elif [ "$TYPE" == "small" ]; then
        opts="--vcpus=1 --memory=2048 --disk size=16"
elif [ "$TYPE" == "medium" ]; then
        opts="--vcpus=2 --memory=4096 --disk size=32"
elif [ "$TYPE" == "large" ]; then
        opts="--vcpus=4 --memory=8192 --disk size=64"
elif [ "$TYPE" == "xlarge" ]; then
        opts="--vcpus=8 --memory=16384 --disk size=128"
elif [ "$TYPE" == "2xlarge" ]; then
        opts="--vcpus=16 --memory=32768 --disk size=256"
else
        echo "invalid type"
        usage
        exit 1
fi

wget -nc https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-10.3.0-amd64-netinst.iso

virt-install $opts \
        --name="$NAME" \
        --location=debian-10.3.0-amd64-netinst.iso \
        --nographics \
        --extra-args='console=tty0 console=ttyS0,115200n8 serial' \
        --network bridge:virbr0