The KVM guests, at least, work fine with live snapshots.Ĭertain workloads, however, do require you to stop of the VM before it is snapshotted. This feature is also known as live snapshot and it is quite valuable since it allows you to take a snapshot of your VM without any downtime. The as this VM was running, the snapshot’s state is also ‘running’, but that doesn’t meant that the snapshot itself is running. The Creation Time column shows the time of creation in a human readable fashion and the State column shows the state of the VM when it was snapshotted. By default, the name of the snapshot is its creation time stamp (the number of seconds since UNIX epoch). You can see that the snapshot is created. Use the following command to list all the VMs under Libvirt’s management.ġ556533387 2019-04- 29 15: 53:07 +0530 running So if you see an error message suggesting,say, “specify domain name”, you need to supply your VM’s name as one of the arguments to the command. Libvirt often refers to virtual machine and containers as Domains. This utility comes with almost all default libvirt installations and should be available across a wide range of distributions.įor the commands below make sure to replace the name of my VM, VM1, with the actual name of your VM. However, I will be using virsh command line interface to show how you can manage your VMs and their snapshots.
GUI applications like virt-manager and oVirt offers the functionality and you can even write custom scripts to interface with libvirt API that manages the entire range of snapshots for you. There are several ways with which you can take and manage snapshots of your VM. If you are not familiar with libvirt and qemu-kvm, here’s a guide on how you can setup KVM on Debian. Your case might differ, but the overall functionality and interface should not be very different, since libvirt tries its best to standardize the frontend interface. I will be using QEMU-KVM as the backend hypervisor for my Libvirt installation. I have previously discussed how snapshots work in VirtualBox and this time I wanted to discuss snapshots within Libvirt. Have a mechanism to use the snapshot to revert your VM back to a previously working state.Take a snapshot of your VM at any given point in time.It hinders your workflow and, therefore, you need a reliable way to: However, it does get tiresome to reinstall the operating system inside your VM over and over again. You can also use disposable VMs, that lacks personal or sensitive data, for malware testing as most of the security community does, just make sure that the VM’s network is isolated from your host and LAN. You can experiment within a VM, apply patches and test upgrades before the doing the same on your production systems or your workstation. VMs have a lot of use cases, one of which is the capacity of VMs to be used as test machines.
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