Virtualization Guide
- About This Manual
- I Introduction
- II Managing Virtual Machines with
libvirt - III Hypervisor-Independent Features
- IV Managing Virtual Machines with Xen
- 19 Setting Up a Virtual Machine Host
- 20 Virtual Networking
- 21 Managing a Virtualization Environment
- 22 Block Devices in Xen
- 23 Virtualization: Configuration Options and Settings
- 24 Administrative Tasks
- 25 XenStore: Configuration Database Shared between Domains
- 26 Xen as a High-Availability Virtualization Host
- V Managing Virtual Machines with QEMU
- VI Managing Virtual Machines with LXC
- Glossary
- A Appendix
- B XM, XL Toolstacks and Libvirt framework
- C GNU Licenses
Part III Hypervisor-Independent Features #Edit source
- 15 Disk Cache Modes
- 16 VM Guest Clock Settings
Keeping the correct time in a VM Guest is one of the more difficult aspects of virtualization. Keeping the correct time is especially important for network applications and is also a prerequisite to do a live migration of a VM Guest.
- 17 libguestfs
Virtual Machines consist of disk images and definition files. Manually accessing and manipulating these guest components (outside of normal hypervisor processes) is possible, but inherently dangerous and risks compromising data integrity. libguestfs is a C library and a corresponding set of tools designed for safely accessing and modifying Virtual Machine disk images—outside of normal hypervisor processes, but without the risk normally associated with manual editing.
- 18 QEMU Guest Agent
The QEMU guest agent (GA) runs inside the VM Guest and allows the VM Host Server to run commands in the guest operating system via
libvirt. It supports many functions—for example, getting details about guest file systems, freezing and thawing file systems, or suspending or rebooting a guest.