|
#!/bin/bash |
|
|
|
usage() { |
|
cat <<EOF |
|
Usage: $(basename "$0") [OPTIONS] |
|
|
|
Launch Ubuntu VMs using libvirt/KVM with cloud-init configuration. |
|
|
|
OPTIONS: |
|
-n, --num-vms NUM Number of VMs to create (default: 1, max: 5) |
|
-m, --memory GB Memory per VM in GB (default: 1, max: 8) |
|
-c, --cpus NUM Number of CPUs per VM (default: 1, max: 2) |
|
-d, --disk-size GB Disk size in GB (default: 10, min: 10) |
|
-g, --github USER GitHub username for SSH key import (required) |
|
-h, --help Show this help message and exit |
|
|
|
EXAMPLES: |
|
$(basename "$0") -g myuser |
|
$(basename "$0") -n 3 -m 2 -c 2 -d 20 -g myuser |
|
$(basename "$0") --num-vms 5 --memory 4 --github myuser |
|
|
|
NOTES: |
|
- VMs will be assigned IPs in the range 192.168.122.2-254 |
|
- The script will automatically find available network octets |
|
- Ubuntu Noble cloud image will be downloaded if not present |
|
EOF |
|
exit 0 |
|
} |
|
|
|
NUM_VMS=1 |
|
MEMORY=1 |
|
CPUS=1 |
|
DISK_SIZE=10 |
|
GITHUB_USER="" |
|
|
|
while [[ $# -gt 0 ]]; do |
|
case $1 in |
|
-n|--num-vms) |
|
NUM_VMS="$2" |
|
shift 2 |
|
;; |
|
-m|--memory) |
|
MEMORY="$2" |
|
shift 2 |
|
;; |
|
-c|--cpus) |
|
CPUS="$2" |
|
shift 2 |
|
;; |
|
-d|--disk-size) |
|
DISK_SIZE="$2" |
|
shift 2 |
|
;; |
|
-g|--github) |
|
GITHUB_USER="$2" |
|
shift 2 |
|
;; |
|
-h|--help) |
|
usage |
|
;; |
|
*) |
|
echo "Error: Unknown option $1" |
|
echo "Use -h or --help for usage information." |
|
exit 1 |
|
;; |
|
esac |
|
done |
|
|
|
if [ -z "$GITHUB_USER" ]; then |
|
echo "Error: GitHub username is required for SSH key import." |
|
echo "Use -g or --github to specify your GitHub username." |
|
echo "Use -h or --help for usage information." |
|
exit 1 |
|
fi |
|
|
|
BASE_IMG="noble-server-cloudimg-amd64.img" |
|
IMG_URL="https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img" |
|
IMG_DIR="/var/lib/libvirt/images" |
|
SUBNET="192.168.122" |
|
GATEWAY="$SUBNET.1" |
|
DHCP_START=2 |
|
DHCP_END=254 |
|
|
|
if [ $NUM_VMS -gt $((DHCP_END - DHCP_START)) ]; then |
|
echo "Error: Max 5 VMs to stay within $DHCP_START-$DHCP_END range." |
|
exit 1 |
|
fi |
|
|
|
if [ $MEMORY -gt 8 ]; then |
|
echo "Error: Max memory is 8GB" |
|
exit 1 |
|
fi |
|
|
|
if [ $CPUS -gt 2 ]; then |
|
echo "Error: Max CPUs is 2" |
|
exit 1 |
|
fi |
|
|
|
if [ $DISK_SIZE -lt 10 ]; then |
|
echo "Error: Disk size must be at least 10GB to accommodate base image." |
|
exit 1 |
|
fi |
|
|
|
if [ ! -f "$IMG_DIR/$BASE_IMG" ]; then |
|
echo "Downloading Ubuntu Noble cloud image..." |
|
wget -O "$IMG_DIR/$BASE_IMG" "$IMG_URL" |
|
if [ $? -ne 0 ]; then |
|
echo "Error: Failed to download the base image from $IMG_URL" |
|
exit 1 |
|
fi |
|
echo "Base image downloaded successfully." |
|
fi |
|
|
|
is_octet_available() { |
|
local octet=$1 |
|
local ip="$SUBNET.$octet" |
|
|
|
for vm in $(virsh list --all --name 2>/dev/null); do |
|
if [ -n "$vm" ]; then |
|
if [ "$vm" = "server-$octet" ]; then |
|
return 1 |
|
fi |
|
fi |
|
done |
|
|
|
if ping -c 1 -W 1 "$ip" &>/dev/null; then |
|
return 1 |
|
fi |
|
|
|
return 0 |
|
} |
|
|
|
AVAILABLE_OCTETS=() |
|
for octet in $(seq $DHCP_START $DHCP_END); do |
|
if is_octet_available $octet; then |
|
AVAILABLE_OCTETS+=($octet) |
|
fi |
|
if [ ${#AVAILABLE_OCTETS[@]} -ge $NUM_VMS ]; then |
|
break |
|
fi |
|
done |
|
|
|
if [ ${#AVAILABLE_OCTETS[@]} -lt $NUM_VMS ]; then |
|
echo "Error: Not enough available network addresses. Found ${#AVAILABLE_OCTETS[@]}, need $NUM_VMS." |
|
echo "Available range is $SUBNET.$DHCP_START-$DHCP_END. Some addresses may already be in use." |
|
exit 1 |
|
fi |
|
|
|
echo "Found ${#AVAILABLE_OCTETS[@]} available network addresses." |
|
|
|
for i in $(seq 0 $(($NUM_VMS - 1))); do |
|
OCTET=${AVAILABLE_OCTETS[$i]} |
|
HOSTNAME="server-$OCTET" |
|
IMG="$IMG_DIR/vm-$OCTET.qcow2" |
|
SEED="$IMG_DIR/seed-$OCTET.iso" |
|
USER_DATA="user-data-$OCTET.yaml" |
|
NETWORK_DATA="network-data-$OCTET.yaml" |
|
|
|
qemu-img create -f qcow2 -F qcow2 -b "$IMG_DIR/$BASE_IMG" "$IMG" ${DISK_SIZE}G |
|
|
|
cat <<EOF > "$USER_DATA" |
|
#cloud-config |
|
hostname: $HOSTNAME |
|
|
|
package_update: true |
|
package_upgrade: true |
|
|
|
users: |
|
- name: ubuntu |
|
shell: /bin/bash |
|
groups: [users, sudo] |
|
sudo: "ALL=(ALL) NOPASSWD:ALL" |
|
lock_passwd: false |
|
passwd: 123456789 |
|
ssh_import_id: |
|
- gh:$GITHUB_USER |
|
|
|
packages: |
|
- apt-transport-https |
|
- xorg |
|
- xterm |
|
- openbox |
|
- chromium-browser |
|
- spice-vdagent |
|
|
|
runcmd: |
|
- mkdir -p /home/ubuntu/.config/openbox |
|
- wget https://raw.githubusercontent.com/Mikachu/openbox/refs/heads/master/data/rc.xml -P /home/ubuntu/.config/openbox |
|
- sed -i '/<\/keyboard>/i \ <keybind key="C-A-t">\n <action name="Execute">\n <command>xterm</command>\n </action>\n </keybind>' /home/ubuntu/.config/openbox/rc.xml |
|
- sed -i '/<\/keyboard>/i \ <keybind key="C-A-b">\n <action name="Execute">\n <command>chromium</command>\n </action>\n </keybind>' /home/ubuntu/.config/openbox/rc.xml |
|
|
|
- sudo apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev liblzma-dev |
|
- cd /tmp/ |
|
- wget https://www.python.org/ftp/python/3.13.7/Python-3.13.7.tgz |
|
- tar xzf Python-3.13.7.tgz |
|
- cd Python-3.13.7 |
|
- sudo ./configure --enable-optimizations |
|
- sudo make -j\$(nproc) |
|
- sudo make altinstall |
|
- sudo ln -s /usr/local/bin/python3.13 /usr/local/bin/python |
|
- sudo ln -s /usr/local/bin/pip3.13 /usr/local/bin/pip |
|
|
|
- echo 'if [[ -z \$DISPLAY ]] && [[ \$(tty) = /dev/tty1 ]]; then exec startx; fi' | sudo tee -a /home/ubuntu/.profile |
|
- echo "alias displays='ps e | grep -Po " DISPLAY=[\\.0-9A-Za-z:]* " | sort -u'" >> /home/ubuntu/.bashrc |
|
- sudo groupadd -g 3001 docker |
|
- sudo usermod -aG docker ubuntu |
|
- curl -fsSL https://get.docker.com -o get-docker.sh |
|
- sudo sh get-docker.sh |
|
- sudo reboot |
|
EOF |
|
|
|
cat <<EOF > "$NETWORK_DATA" |
|
#cloud-config |
|
network: |
|
version: 2 |
|
ethernets: |
|
interface0: |
|
match: |
|
name: "en*s0" |
|
dhcp4: false |
|
addresses: [$SUBNET.$OCTET/24] |
|
routes: |
|
- to: default |
|
via: $GATEWAY |
|
nameservers: |
|
addresses: [8.8.8.8,8.8.4.4] |
|
EOF |
|
|
|
echo "$(cat $USER_DATA)" |
|
echo "$(cat $NETWORK_DATA)" |
|
|
|
cloud-localds --network-config "$NETWORK_DATA" "$SEED" "$USER_DATA" |
|
|
|
rm "$USER_DATA" |
|
rm "$NETWORK_DATA" |
|
|
|
virt-install \ |
|
--name "$HOSTNAME" \ |
|
--memory $(( $MEMORY * 1024 )) \ |
|
--vcpus $CPUS \ |
|
--disk path="$IMG",bus=virtio,format=qcow2 \ |
|
--disk path="$SEED",bus=virtio,format=raw \ |
|
--network default \ |
|
--os-variant ubuntu24.04 \ |
|
--graphics spice,listen=0.0.0.0 \ |
|
--channel spicevmc \ |
|
--video virtio \ |
|
--import \ |
|
--noautoconsole |
|
|
|
echo "Launched VM $((i + 1)): $HOSTNAME with IP $SUBNET.$OCTET (disk size: ${DISK_SIZE}GB)" |
|
done |
|
|
|
echo "All $NUM_VMS VMs launched. Use 'virsh list --all' to see VMs, 'virsh start/stop/destroy <name>', 'virsh console <name>' for access. Clean up images/ISOs when done." |
