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Refactorized scripts

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victor
2025-07-17 17:39:48 +02:00
parent e2c3ec0f13
commit b99db7713c
11 changed files with 540 additions and 13 deletions
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#!/bin/env bash
OS_JSON_FILE="os_options.json"
#VM_BASE_DIR=${VM_BASE_DIR:-"${HOME}/.local/share/libvirt"}
#VM_BASE_DIR=${VM_BASE_DIR:-"${HOME}/var/lib/libvirt"}
VM_BASE_DIR="${HOME}/vms"
VM_BASE_IMAGES="base"
VM_USERNAME="user"
VM_IMAGE_PATH="${VM_BASE_DIR}/images/$1.img"
CI_IMAGE_PATH="${VM_BASE_DIR}/images/$1-cidata.iso"

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#!/bin/env bash
LIBVIRT_NET_MODEL="virtio"
LIBVIRT_NET_OPTION="network=$VM_NETWORK,model=$LIBVIRT_NET_MODEL"
OS_JSON_FILE="files/os_options.json"
#VM_BASE_DIR=${VM_BASE_DIR:-"${HOME}/.local/share/libvirt"}
#VM_BASE_DIR=${VM_BASE_DIR:-"${HOME}/var/lib/libvirt"}
VM_BASE_DIR="${HOME}/vms"
VM_BASE_IMAGES="base"
VM_DISK_EXTENSION="img"
VM_USERNAME="user"
VM_IMAGE_PATH="${VM_BASE_DIR}/images/$1.img"
CI_IMAGE_PATH="${VM_BASE_DIR}/images/$1-cidata.iso"
VM_NETWORK="vmnetwork"
REPO_BRANCH="main"
REPO_SOURCE="https://raw.githubusercontent.com/vgenguita/kvm-cloudimage/refs/heads/${REPO_BRANCH}/env_scripts/"

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#!/bin/env bash
# Functions
check_host_os()
{
local HOST_OS=$(cat /etc/os-release | grep -v VERSION_ID |grep "ID=" | awk -F'=' '{print $2}')
if [ $HOST_OS == "debian" ]; then
source env_scripts/older_os.sh
else
source env_scripts/newer_os.sh
fi
}
show_vm_menu()
{
# Show dinamic menu
echo "Select VM OS:"
for entry in $(jq -r '.os_variants[] | @base64' "$OS_JSON_FILE"); do
decoded=$(echo "$entry" | base64 --decode)
id=$(echo "$decoded" | jq -r .id)
name=$(echo "$decoded" | jq -r .name)
echo "$id. $name"
done
# ID_MAX calculation
ID_MAX=$(jq -r '[.os_variants[].id] | max' "$OS_JSON_FILE")
# Read input
read -r -p "Enter your choice [1-${ID_MAX}]: " answer
if ! [[ "$answer" =~ ^[0-9]+$ ]] || (( answer < 1 || answer > ID_MAX )); then
echo "Invalid option. Please enter a number between 1 and ${ID_MAX}."
exit 1
fi
selected=$(jq -r ".os_variants[] | select(.id == $answer)" "$OS_JSON_FILE")
if [ -z "$selected" ]; then
echo "Invalid option."
exit 1
fi
# Asignar variables
VM_OS_VARIANT=$(echo "$selected" | jq -r .variant)
VM_BASE_IMAGE_URL=$(echo "$selected" | jq -r .url)
VM_BASE_IMAGE=$(echo "$selected" | jq -r .origin_image_name)
VM_BOOT_TYPE=$(echo "$selected" | jq -r .boot_type)
VM_CHECKSUMS_URL=$(echo "$selected" | jq -r .md5sum)
}
compare_checksum()
{
CHECKSUM_TMP_FOLDER=$(mktemp)
curl -s -o "${CHECKSUM_TMP_FOLDER}" "${VM_CHECKSUMS_URL}"
VM_BASE_IMAGE_CHECKSUM=$(grep "$VM_BASE_IMAGE_NAME.${VM_BASE_IMAGE_EXTENSION}" "${CHECKSUM_TMP_FOLDER}" | awk '{print $1}')
if [[ "${VM_CHECKSUMS_URL}" == *"SHA256SUMS"* ]]; then
HASH_CMD="sha256sum"
elif [[ "${VM_CHECKSUMS_URL}" == *"SHA512SUMS"* ]]; then
HASH_CMD="sha512sum"
else
echo "ERROR: Unknown checksum type in URL: $CHECKSUM_URL"
exit 1
fi
BASE_FILE_CHECKSUM=$(${HASH_CMD} ${VM_BASE_IMAGE_LOCATION} | awk '{print $1}')
if [ "${BASE_FILE_CHECKSUM}" = "${VM_BASE_IMAGE_CHECKSUM}" ]; then
echo "Checksum OK: ${BASE_FILE_CHECKSUM}"
else
echo "ERROR: MD5 checksum does NOT match!"
echo "Expected: ${VM_BASE_IMAGE_CHECKSUM}"
echo "Got: ${BASE_FILE_CHECKSUM}"
exit 1
fi
}
## List Installed VMS
vm_list()
{
virsh list
}
vm_net_get_mac()
{
local VM=$1
MAC_VM=$(virsh domiflist "$VM" | awk '{ print $5 }' | tail -2 | head -1)
echo $MAC_VM
}
## Get VM ip (only on NAT)
vm_net_get_ip()
{
local VM="$1"
# Obtener la dirección MAC de la interfaz de red
MAC_VM=$(vm_net_get_mac $VM)
if [[ -z "$MAC_VM" ]]; then
echo "Error: No se pudo encontrar la dirección MAC para '$VM'"
return 1
fi
# Obtener la dirección IP a partir de la dirección MAC
VM_IP_ADDRESS=$(arp -a | grep "$MAC_VM" | awk '{ print $2 }' | sed 's/[()]//g')
if [[ -z "$VM_IP_ADDRESS" ]]; then
echo "Error: No se pudo encontrar la dirección IP para la dirección MAC '$MAC_VM'"
return 1
fi
echo "$VM_IP_ADDRESS"
}
vm_net_create_netplan()
{
local VM=$1
local MAV_VM=$2
cat <<EOF > "$VM_BASE_DIR/init/${VM}-netplan"
# This file is generated from information provided by the datasource. Changes
# to it will not persist across an instance reboot. To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
ethernets:
enp1s0:
addresses:
- ${IP}/24
nameservers:
addresses:
- 208.67.222.222
- 208.67.220.220
match:
macaddress: ${MAC_VM}
set-name: enp1s0
version: 2
EOF
}
vm_net_bridge_set_ip()
{
local VM="$1"
local IP="$2"
MAC_VM=$(vm_net_get_mac "$VM")
CURRENT_IP=$(vm_net_get_ip "$VM")
define_netplan
# Obtener la dirección IP de la máquina virtual
scp -i ${VM_BASE_DIR}/ssh/${VM} \
-r $VM_BASE_DIR/init/${VM}-netplan \
${VM_USERNAME}@${CURRENT_IP}:50-cloud-init.yaml
ssh -i ${VM_BASE_DIR}/ssh/${VM} -l${VM_USERNAME} ${CURRENT_IP} "bash -s" -- < ../vm_example_scripts/apply_netplan.sh
}
vm_net_set_bridge_mode()
{
if [[ -n $VM_BRIDGE_INT ]]; then
LIBVIRT_NET_OPTION="model=virtio,bridge=${VM_BRIDGE_INT}"
fi
}
## Connect to an existent VM using ssh
vm_connect()
{
local VM=$1
local VM_IP=$(vm_net_get_ip "$VM")
ssh -i ${VM_BASE_DIR}/ssh/${VM} -l${VM_USERNAME} ${VM_IP}
}
## Delete VM
vm_delete ()
{
local VM=$1
echo "VM: $VM"
if [[ -f "$VM_IMAGE_PATH" ]]; then
# Safely remove the VM with confirmation
read -p "Are you sure you want to remove the VM '$VM' (y/N)? " confirm
if [[ "$confirm" =~ ^[Yy]$ ]]; then
# Attempt to stop the VM before deleting
virsh destroy "$VM" 2>/dev/null || true
# Delete VM definition and associated images
virsh undefine "$VM" 2>/dev/null || true
rm -fv "$VM_IMAGE_PATH" "$CI_IMAGE_PATH"
rm ${VM_BASE_DIR}/xml/$1.xml
rm ${VM_BASE_DIR}/ssh/$1
rm ${VM_BASE_DIR}/ssh/$1.pub
rm ${VM_BASE_DIR}/init/$1-user-data
rm ${VM_BASE_DIR}/init/$1-meta-data
else
echo "VM removal cancelled."
fi
else
# Handle case where VM image is not found
echo "Cannot find VM image file '$VM_IMAGE_PATH'. No action taken."
fi
}
vm_download_base_image()
{
VM_BASE_IMAGE_NAME=${VM_BASE_IMAGE%%.*}
VM_BASE_IMAGE_EXTENSION=${VM_BASE_IMAGE#*.}
VM_BASE_IMAGE_LOCATION="${VM_BASE_DIR}/${VM_BASE_IMAGES}/${VM_BASE_IMAGE_NAME}.${VM_BASE_IMAGE_EXTENSION}"
if ! test -f "${VM_BASE_IMAGE_LOCATION}"; then
wget -O "${VM_BASE_IMAGE_LOCATION}" ${VM_BASE_IMAGE_URL}
fi
}
vm_create_guest_image()
{
echo "Creating a qcow2 image file ${VM_BASE_DIR}/images/${VM_HOSTNAME}.${VM_DISK_EXTENSION} that uses the cloud image file ${VM_BASE_IMAGE_LOCATION} as its base"
if ! test -f "${VM_BASE_DIR}/images/${VM_HOSTNAME}.${VM_DISK_EXTENSION}"; then
qemu-img convert \
-O qcow2 \
"${VM_BASE_IMAGE_LOCATION}" \
"${VM_BASE_DIR}/images/${VM_HOSTNAME}.${VM_DISK_EXTENSION}"
qemu-img resize \
"${VM_BASE_DIR}/images/${VM_HOSTNAME}.${VM_DISK_EXTENSION}" \
"${VM_DISK_SIZE}G"
sudo chown -R $USER:libvirt-qemu "${VM_BASE_DIR}/images/${VM_HOSTNAME}.${VM_DISK_EXTENSION}"
else
echo "${VM_BASE_DIR}/images/${VM_HOSTNAME}.${VM_DISK_EXTENSION} already exists. Delete VM with "delete" option"
exit 1
fi
}
vm_generate_ssh_hey()
{
ssh-keygen -t rsa -b 4096 -N '' -f "${VM_BASE_DIR}/ssh/${VM_HOSTNAME}"
chmod 600 ${VM_BASE_DIR}/ssh/${VM_HOSTNAME}.pub
SSH_PUB_KEY=$(cat "${VM_BASE_DIR}/ssh/${VM_HOSTNAME}.pub")
#ssh-keygen -y -f "${VM_BASE_DIR}/ssh/${VM_HOSTNAME}" > "${VM_BASE_DIR}/ssh/${VM_HOSTNAME}".pub.txt
#SSH_PUB_KEY=$(cat "${VM_BASE_DIR}/ssh/${VM_HOSTNAME}".pub.txt)
#rm "${VM_BASE_DIR}/ssh/${VM_HOSTNAME}".pub.txt
}
vm_gen_linux_user_data()
{
VM_USER_PASS=$(tr -dc A-Za-z0-9 </dev/urandom | head -c 8; echo)
VM_USER_PASS_HASH=$(mkpasswd --method=SHA-512 --rounds=4096 ${VM_USER_PASS})
cat <<EOF > "$VM_BASE_DIR/init/${VM_HOSTNAME}-user-data"
#cloud-config
hostname: ${VM_HOSTNAME}
# manage_etc_hosts: false
ssh_pwauth: true
disable_root: true
users:
- name: ${VM_USERNAME}
hashed_passwd: ${VM_USER_PASS_HASH}
sudo: ALL=(ALL) NOPASSWD:ALL
shell: /bin/bash
lock-passwd: false
ssh_authorized_keys:
- ${SSH_PUB_KEY}
EOF
}
vm_gen_user_data()
{
VM_USER_PASS=$(tr -dc A-Za-z0-9 </dev/urandom | head -c 8; echo)
VM_USER_PASS_HASH=$(mkpasswd --method=SHA-512 --rounds=4096 ${VM_USER_PASS})
cp files/user-data "$VM_BASE_DIR/init/${VM_HOSTNAME}-user-data"
sed -i "s|__SSH_KEY__|${SSH_PUB_KEY}|g" "$VM_BASE_DIR/init/${VM_HOSTNAME}-user-data"
sed -i "s| __USER_PASSWORD__|${VM_USER_PASS_HASH}|g" "$VM_BASE_DIR/init/${VM_HOSTNAME}-user-data"
}
vm_gen_meta_data()
{
cp files/meta-data "$VM_BASE_DIR/init/${VM_HOSTNAME}-meta-data"
sed -i "s|__VMname__|${VM_HOSTNAME}|g" "$VM_BASE_DIR/init/${VM_HOSTNAME}-meta-data"
}
vm_guest_install()
{
VM_INSTALL_OPTS=""
VM_INSTALL_OPTS="${VM_INSTALL_OPTS} --name ${VM_HOSTNAME}"
VM_INSTALL_OPTS="${VM_INSTALL_OPTS} --memory ${VM_MEM_SIZE}"
VM_INSTALL_OPTS="${VM_INSTALL_OPTS} --vcpus ${VM_VCPUS}"
VM_INSTALL_OPTS="${VM_INSTALL_OPTS} --os-variant=${VM_OS_VARIANT}"
VM_INSTALL_OPTS="${VM_INSTALL_OPTS} --disk ${VM_BASE_DIR}/images/${VM_HOSTNAME}.img,device=disk,bus=virtio"
VM_INSTALL_OPTS="${VM_INSTALL_OPTS} --network ${LIBVIRT_NET_OPTION}"
VM_INSTALL_OPTS="${VM_INSTALL_OPTS} --autostart"
VM_INSTALL_OPTS="${VM_INSTALL_OPTS} --import --noautoconsole"
VM_INSTALL_OPTS="${VM_INSTALL_OPTS} --cloud-init user-data=${VM_BASE_DIR}/init/${VM_HOSTNAME}-user-data,meta-data=$VM_BASE_DIR/init/${VM_HOSTNAME}-meta-data"
if [ "$VM_BOOT_TYPE" = "UEFI" ]; then
VM_INSTALL_OPTS="${VM_INSTALL_OPTS} --boot uefi"
fi
eval virt-install $VM_INSTALL_OPTS
virsh dumpxml "${VM_HOSTNAME}" > "${VM_BASE_DIR}/xml/${VM_HOSTNAME}.xml"
}

2
files/meta-data Normal file
View File

@ -0,0 +1,2 @@
instance-id: __VMname__
local-hostname: __VMname__

2
network.xml → files/network.xml
View File

@ -1,5 +1,5 @@
<network>
<name>vmnetwork</name>
<name>YOURNETWORK</name>
<forward mode='nat'>
<nat>
<port start='1024' end='65535'/>

33
os_options.json → files/os_options.json
View File

@ -21,6 +21,15 @@
},
{
"id": 3,
"name": "Ubuntu 20.04 minimal",
"variant": "ubuntu20.04",
"url": "https://cloud-images.ubuntu.com/minimal/releases/focal/release/ubuntu-20.04-minimal-cloudimg-amd64.img",
"origin_image_name": "ubuntu-20.04-minimal-cloudimg-amd64.img",
"md5sum": "https://cloud-images.ubuntu.com/minimal/releases/focal/release/SHA256SUMS",
"boot_type": "bios"
},
{
"id": 4,
"name": "Ubuntu 22.04 server",
"variant": "ubuntu22.04",
"url": "https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64.img",
@ -28,14 +37,32 @@
"md5sum": "https://cloud-images.ubuntu.com/jammy/current/SHA256SUMS",
"boot_type": "uefi"
},
"id": 4,
{
"id": 5,
"name": "Ubuntu 22.04 minimal",
"variant": "ubuntu22.04",
"url": "https://cloud-images.ubuntu.com/minimal/releases/jammy/release/ubuntu-22.04-minimal-cloudimg-amd64.img",
"origin_image_name": "ubuntu-22.04-minimal-cloudimg-amd64.img",
"md5sum": "https://cloud-images.ubuntu.com/minimal/releases/jammy/release/SHA256SUMS",
"boot_type": "uefi"
},
{
"id": 6,
"name": "Ubuntu 24.04 server",
"variant": "ubuntu22.04",
"url": "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img",
"origin_image_name": "noble-server-cloudimg-amd64.img",
"md5sum": "https://cloud-images.ubuntu.com/noble/current/SHA256SUMS",
"boot_type": "uefi"
}
},
{
"id": 7,
"name": "Ubuntu 24.04 minimal",
"variant": "ubuntu22.04",
"url": "https://cloud-images.ubuntu.com/minimal/releases/noble/release/ubuntu-24.04-minimal-cloudimg-amd64.img",
"origin_image_name": "ubuntu-24.04-minimal-cloudimg-amd64.img",
"md5sum": "https://cloud-images.ubuntu.com/minimal/releases/noble/release/SHA256SUMS",
"boot_type": "uefi"
}
]
}

12
files/user-data Normal file
View File

@ -0,0 +1,12 @@
ssh_pwauth: true
disable_root: true
users:
- name: user
ssh_authorized_keys:
- __SSH_KEY__
sudo: ["ALL=(ALL) NOPASSWD:ALL"]
groups: sudo
shell: /bin/bash
hashed_passwd: __USER_PASSWORD__
lock-passwd: false

13
install.sh Normal file
View File

@ -0,0 +1,13 @@
#!/bin/env bash
#Define variable names on env_scripts/common.sh
#VM_NETWORK=
#VM_BASE_DIR=
#Install dependencies - TODO
source variables/common.sh
mkdir -p "${VM_BASE_DIR}"/{images,xml,init,base,ssh}
cp files/network.xml ${VM_BASE_DIR}/xml/network.xml
sed -i "s/YOURNETWORK/${VM_NETWORK}/g" ${VM_BASE_DIR}/xml/network.xml
virsh net-define ${VM_BASE_DIR}/xml/network.xml
virsh net-autostart ${VM_NETWORK}
virsh net-start ${VM_NETWORK}

0
kvm_cloudimage.sh
View File

143
vm_manage.sh Executable file
View File

@ -0,0 +1,143 @@
#!/bin/env bash
source env_scripts/common.sh
source env_scripts/functions.sh
# Default values for VM creation parameters
VM_MEM_SIZE=1024
VM_VCPUS=1
VM_DISK_SIZE=10
# Function to display usage message
usage() {
echo "Usage: $0 create -n NAME [-b BRIDGE] [-r RAM] [-c VCPUS] [-s DISK] [-v]"
echo " $0 delete -n NAME"
echo " $0 info -n NAME"
echo " $0 connect -n NAME"
echo " $0 list"
echo ""
echo "Actions:"
echo " create Create a new virtual machine"
echo " delete Delete a virtual machine"
echo " list List all defined virtual machines"
echo " info Show information about a virtual machine"
echo " connect Connect to the console of a virtual machine"
echo ""
echo "Options for 'create':"
echo " -h Show this help message"
echo " -n NAME Host name (required)"
echo " -b BRIDGE Bridge interface name"
echo " -r RAM RAM in MB (default: ${VM_MEM_SIZE})"
echo " -c VCPUS Number of VCPUs (default: ${VM_VCPUS})"
echo " -s DISK Disk size in GB (default: ${VM_DISK_SIZE})"
echo " -v Verbose mode"
exit 1
}
# Check if at least one argument is provided
if [ $# -eq 0 ]; then
usage
fi
ACTION="$1"
shift
case "${ACTION}" in
create)
# Parse options for create command
VERBOSE=false
NAME_SET=false
while getopts ":hn:b:r:c:s:v" opt; do
case "${opt}" in
h)
usage
;;
n)
VM_HOSTNAME="${OPTARG}"
NAME_SET=true
;;
b)
BRIDGE_INTERFACE="${OPTARG}"
;;
r)
VM_MEM_SIZE="${OPTARG}"
;;
c)
VM_VCPUS="${OPTARG}"
;;
s)
VM_DISK_SIZE="${OPTARG}"
;;
v)
VERBOSE=true
;;
\?)
echo "Invalid option: -${OPTARG}" >&2
usage
;;
:)
echo "Option -${OPTARG} requires an argument." >&2
usage
;;
esac
done
# Check that required parameter (-n) was provided
if ! ${NAME_SET}; then
echo "Error: The -n option is required for create action." >&2
usage
fi
source env_scripts/common.sh
#Check network type
vm_net_set_bridge_mode
#Check host os for guest debian type
check_host_os
#Read os_options.json and generate guests menu
#Select guest
show_vm_menu
#Download cloud image
vm_download_base_image
#Compare hashes
compare_checksum
#Create guest image
vm_create_guest_image
#Generate ssh key
vm_generate_ssh_hey
#Generate meta-data file for VM
vm_gen_meta_data
#Generate user-data file for VM
vm_gen_linux_user_data
#Install VM
vm_guest_install
;;
delete|info|connect)
# These actions require a NAME directly as first argument after ACTION
if [ $# -ne 1 ]; then
echo "Error: ${ACTION} requires a VM name as argument." >&2
usage
fi
VM_HOSTNAME="$1"
source env_scripts/common.sh
echo "Action: ${ACTION}"
echo "VM Name: ${VM_HOSTNAME}"
if [[ "${ACTION}" == 'delete' ]]; then
vm_delete ${VM_HOSTNAME}
elif [[ "${ACTION}" == 'info' ]]; then
vm_net_get_ip ${VM_HOSTNAME}
elif [[ "${ACTION}" == 'connect' ]]; then
vm_connect ${VM_HOSTNAME}
fi
;;
list)
#echo "Action: list"
vm_list
;;
*)
echo "Unknown action: ${ACTION}" >&2
usage
;;
esac
exit 0