vmcreate.sh

vmcreate.sh

#!/bin/bash

# Bail out on any error
set -e

# Check for root privileges
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 
   exit 1
fi

# Usage message
USAGE="Usage: $0 <vm_name> <disk_size> <memory_size_in_MB>"

# Check if all three arguments are passed
if [ "$#" -ne 3 ]; then
    echo "Error: You must provide exactly 3 arguments."
    echo $USAGE
    exit 1
fi

# Assign arguments to variables
VM_NAME=$1
DISK_SIZE=$2
MEMORY_MB=$3

echo "VM Name: $VM_NAME"
echo "Disk Size: $DISK_SIZE"
echo "Memory Size: $MEMORY_MB MB"

# Calculating RAM size in KiB
MEMORY_KiB=$((MEMORY_MB * 1024))

# Base directory for VMs
BASE_DIR="/home/sf/virt"

# Path to the original image
BASE_IMAGE="${BASE_DIR}/images/CentOS-7-x86_64-GenericCloud.qcow2"

# Path to the new VM disk image
VM_DISK="${BASE_DIR}/vm/${VM_NAME}.qcow2"

# Path to the VM definition
VM_XML="${BASE_DIR}/defines/${VM_NAME}.xml"

# Check if VM already exists
if [ -f "$VM_DISK" ]; then
    echo "Error: A disk for VM name $VM_NAME already exists."
    exit 1
fi

# Copying the base image to create a new VM disk
cp "$BASE_IMAGE" "$VM_DISK"

# Resizing disk
qemu-img resize "$VM_DISK" "$DISK_SIZE"

# Changing root password and setting hostname
virt-customize -a "$VM_DISK" --hostname "$VM_NAME" --root-password password:Krucjata1 --uninstall cloud-init

# Create the VM XML definition
cat > "$VM_XML" <<EOF
<domain type='kvm'>
  <name>$VM_NAME</name>
  <memory unit='KiB'>$MEMORY_KiB</memory>
  <currentMemory unit='KiB'>$MEMORY_KiB</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch='x86_64'>hvm</type>
    <boot dev='hd'/>
  </os>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>
    <disk type='file' device='disk'>
       <driver name='qemu' type='qcow2'/>
       <source file='$VM_DISK'/>
       <target dev='vda' bus='virtio'/>
    </disk>
    <interface type='bridge'>
      <source bridge='br1'/>
      <model type='virtio'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
  </devices>
</domain>
EOF

# Defining VM
virsh define "$VM_XML"

# Launching VM
virsh start "$VM_NAME"

echo "$VM_NAME has been created and started."