[GitHub] [cloudstack] slavkap opened a new pull request #3724: Storage-based Snapshots for KVM VMs

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slavkap opened a new pull request #3724: Storage-based Snapshots for KVM VMs
URL: https://github.com/apache/cloudstack/pull/3724
 
 
   ## Description
   
   Cloudstack with KVM as a hypervisor provides live VM snapshots only with volumes which image format is QCOW. 
   This is a limitation for storage providers with disks in RAW format.
   
   link to ML: http://mail-archives.apache.org/mod_mbox/cloudstack-dev/201911.mbox/%3cCAA6FghF7eaY-A3XGN5zSwKVvp7zrcuNzv5nFAQKaF+et3zH-ag@mail.gmail.com%3e#archives
   
   
   With this feature
   - CloudStack users will be able to do a live consistent snapshots of all disks attached to the VM 
   - Is using respective storage provider plugin implementation to take the snapshot
   - For NFS/Local storages we are using qemu command - drive-backup. We recommend to use
   	this functionality only if you have VMs with mixed volumes (in RAW and QCOW format). 
   - You can create VM snapshot without it's memory
   - Creates in the UI and DB VM snapshot and volume's snapshot related to the VM snapshot 
   
   ## Types of changes
   <!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
   - [ ] Breaking change (fix or feature that would cause existing functionality to change)
   - [X] New feature (non-breaking change which adds functionality)
   - [ ] Bug fix (non-breaking change which fixes an issue)
   - [ ] Enhancement (improves an existing feature and functionality)
   - [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
   
   ## Prerequisites
   
   - Install qemu-guest-agent on guest machine (used to freeze/thaw the virtual machine)
   - In global settings "kvm.vmstoragesnapshot.enabled" has to be set to true
   
   - If volumes' image format is QCOW you need - qemu version 1.6+ for drive-backup command. If you’re with the latest stable Ubuntu it will be included, but for CentOS7 you need to install qemu-kvm-ev.
   - When using drive-backup command the option - "snapshot.backup.to.secondary" should be enabled.
   
   ## How Has This Been Tested?
   
   Environment:
   
   - CloudStack - management and agent version - 4.14.0.0-SNAPSHOT
   - OS for management and hypervisor - CentOS7
   - Hypervisor - KVM
   - Primary storages - NFS, StorPool, Local storage and Ceph. 
   
   Take snapshot:
   - Take VM snapshot without memory on running virtual machine
   - We have tested this feature with these storage providers - NFS, StorPool, Local storage and Ceph. 
   - There is one smoke test, which creates VM, installs qemu-guest-agent, takes, reverts and deletes VM snapshot. 
   
   Revert snapshot
   - Stop the virtual machine and revert the VM snapshot
   
   

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