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April 5, 2017 15:45
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While working with some of my KVM vm's I needed the ability to take snapshots quickly as well as revert back to a desired point. The following shell functions are used in my bashrc to make it simple for me to accomplish these task. NOTE: These snapshots are only for the file system and require qcow2 disk images for the backing storage.
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| #!/bin/bash | |
| wake(){ # Start your VM | |
| sudo virsh start $1 | |
| } | |
| slay(){ # Stop your VM | |
| sd_time=20 | |
| sudo virsh shutdown $1 | |
| if [[ $? ]]; then | |
| echo "Shutting Down VM, hold $sd_time seconds." | |
| sleep $sd_time | |
| fi | |
| echo "Checking to see if VM is down? (will kill VM violently if not!)" | |
| if [[ running == `sudo virsh list | grep $1 | awk '{print $3}'` ]]; then | |
| echo "Killing VM violently" | |
| sudo virsh destroy $1 | |
| else | |
| echo "VM was shutdown successfuly!" | |
| fi | |
| } | |
| breed(){ # Create a qcow2 storage device | |
| if [[ -n "$1" ]] && [[ -n "$2" ]]; then | |
| sudo qemu-img create -f qcow2 /var/lib/libvirt/images/${1}.img ${2}G | |
| else | |
| echo "Disk Name or size (in GB) not supplied." | |
| echo " breed NAME SIZE" | |
| fi | |
| } | |
| hatch(){ # Create a VM | |
| if [[ -n $1 ]]; then | |
| NAME=$1 | |
| else | |
| echo "Must supply a VM name." | |
| echo " hatch VM_NAME DISK_NAME RAM_SIZE NETWORK INSTALL_MEDIA" | |
| return 1 | |
| fi | |
| if [[ -n $2 ]]; then | |
| DISK=/var/lib/libvirt/images/$2 | |
| else | |
| echo "Must supply an image name. Try one of the following:" | |
| ls /var/lib/libvirt/images/ | |
| echo " hatch VM_NAME DISK_NAME RAM_SIZE NETWORK INSTALL_MEDIA" | |
| return 1 | |
| fi | |
| if [[ -n $3 ]]; then | |
| RAM=$3 | |
| else | |
| echo "Must supply your RAM size in MB (1024 = 1GB)" | |
| echo " hatch VM_NAME DISK_NAME RAM_SIZE NETWORK INSTALL_MEDIA" | |
| return 1 | |
| fi | |
| if [[ -n $4 ]]; then | |
| NETWORK=$4 | |
| else | |
| echo "Must supply a VM Network. Try:" | |
| sudo virsh net-list | tail -n+3 | awk '{print $1}' | |
| echo " hatch VM_NAME DISK_NAME RAM_SIZE NETWORK INSTALL_MEDIA" | |
| return 1 | |
| fi | |
| if [[ -n $5 ]]; then | |
| INSTALL_IMAGE=$5 | |
| else | |
| echo "Must supply the location of install media." | |
| echo " hatch VM_NAME DISK_NAME RAM_SIZE NETWORK INSTALL_MEDIA" | |
| return 1 | |
| fi | |
| sudo virt-install --cdrom $INSTALL_IMAGE --name $NAME --ram $RAM --disk $DISK,bus="virtio" --network network=$NETWORK | |
| } | |
| hunt(){ # Get Snapshot informaion from the VM | |
| if [[ -n "$1" ]]; then | |
| base_image=`sudo virsh domblklist $1 | grep vda | awk '{print $2}'` | |
| else | |
| echo "Must supply Domain" | |
| return 1 | |
| fi | |
| IP=$(ip neighbour | grep $(sudo virsh dumpxml $1 | grep "mac address" | awk -F\' '{ print $2 }') | awk '{ print $1 }') | |
| if [[ -z $IP ]]; then | |
| IP="Can Not Determin!" | |
| fi | |
| echo "Base Image: $base_image" | |
| echo IP: $IP | |
| sudo qemu-img snapshot -l $base_image | |
| } | |
| tame(){ # Create a Snapshot of a VM # qemu-img snapshot -c SNAPSHOT BASE_IMAGE | |
| # This assumes that you are using a VIRTIO device (need to find a better way of doing this. | |
| if [[ -n "$1" ]]; then | |
| base_image=`sudo virsh domblklist $1 | grep vda | awk '{print $2}'` | |
| else | |
| echo "Must supply Domain" | |
| return 1 | |
| fi | |
| if [[ -z $2 ]]; then | |
| echo "Must supply Snapshot Name" | |
| else | |
| # VM has to be down to save it's state.. | |
| echo "Shutting down $1 to save it current disk state." | |
| sudo virsh shutdown $1 | |
| if [[ running == `sudo virsh list | grep $1 | awk '{print $3}'` ]]; then | |
| echo "Killing VM violently" | |
| sudo virsh destroy $1 | |
| fi | |
| echo "Base Image: $base_image" | |
| for snapshot in `sudo qemu-img snapshot -l $base_image | tail -n+3 | awk '{print $2}'`; do | |
| if [[ $snapshot == $2 ]]; then | |
| echo "Snapshot Already exsists! You can chose to overwrite or create a new snapshot with the same name." | |
| read -p "Would you like to overwrite[Y|y]? " -n 1 -r | |
| if [[ $REPLY =~ ^[Yy]$ ]]; then | |
| echo " deleting snapshot ..." | |
| sudo qemu-img snapshot -d $2 $base_image | |
| echo "Deleted Snapshot ..." | |
| else | |
| echo | |
| fi | |
| fi | |
| done | |
| sudo qemu-img snapshot -c $2 $base_image | |
| echo "Snapshot Created!" | |
| fi | |
| } | |
| revive(){ # Apply a VM Snapshot | |
| if [[ -n "$1" ]]; then | |
| base_image=`sudo virsh domblklist $1 | grep vda | awk '{print $2}'` | |
| else | |
| echo "Must supply Domain" | |
| return 1 | |
| fi | |
| if [[ -n "$2" ]]; then | |
| echo "reverting $base_image to $2 snapshot." | |
| slay $1 | |
| sudo qemu-img snapshot -a $2 $base_image | |
| echo " Revert Complete!" | |
| sudo virsh start $1 | |
| return 0 | |
| else | |
| echo "Must Supply Snapshot!" | |
| echo " Choose from the following:" | |
| sudo qemu-img snapshot -l $base_image | |
| return 1 | |
| fi | |
| return 1 | |
| } | |
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