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ContentsContents
Virtualization Guide
  1. About This Manual
  2. I Introduction
    1. 1 Virtualization Technology
    2. 2 Introduction to Xen Virtualization
    3. 3 Introduction to KVM Virtualization
    4. 4 Introduction to Linux Containers
    5. 5 Virtualization Tools
    6. 6 Installation of Virtualization Components
    7. 7 Supported Hosts, Guests, and Features
  3. II Managing Virtual Machines with libvirt
    1. 8 Starting and Stopping libvirtd
    2. 9 Guest Installation
    3. 10 Basic VM Guest Management
    4. 11 Connecting and Authorizing
    5. 12 Managing Storage
    6. 13 Managing Networks
    7. 14 Configuring Virtual Machines with Virtual Machine Manager
    8. 15 Configuring Virtual Machines with virsh
  4. III Hypervisor-Independent Features
    1. 16 Disk Cache Modes
    2. 17 VM Guest Clock Settings
    3. 18 libguestfs
    4. 19 QEMU Guest Agent
    5. 20 Creating crash dumps of a VM Guest
  5. IV Managing Virtual Machines with Xen
    1. 21 Setting Up a Virtual Machine Host
    2. 22 Virtual Networking
    3. 23 Managing a Virtualization Environment
    4. 24 Block Devices in Xen
    5. 25 Virtualization: Configuration Options and Settings
    6. 26 Administrative Tasks
    7. 27 XenStore: Configuration Database Shared between Domains
    8. 28 Xen as a High-Availability Virtualization Host
  6. V Managing Virtual Machines with QEMU
    1. 29 QEMU Overview
    2. 30 Setting Up a KVM VM Host Server
    3. 31 Guest Installation
    4. 32 Running Virtual Machines with qemu-system-ARCH
    5. 33 Virtual Machine Administration Using QEMU Monitor
  7. VI Managing Virtual Machines with LXC
    1. 34 Linux Containers
    2. 35 Migration from LXC to libvirt-lxc
  8. Glossary
  9. A Virtual Machine Drivers
  10. B Appendix
  11. C XM, XL Toolstacks and Libvirt framework
  12. D Licencias GNU
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Applies to SUSE Linux Enterprise Server 15 SP1

20 Creating crash dumps of a VM Guest

20.1 Introduction
20.2 Creating crash dumps for fully virtualized machines
20.3 Creating crash dumps for paravirtualized machines
20.4 Additional information

20.1 Introduction

Whenever a VM crashes, it is useful to collect a core dump of the VM memory for debugging and analysis. For physical machines, Kexec and Kdump takes care of collecting crash dumps. For virtual machines, it depends whether the guest is fully virtualized (FV) or paravirtualized (PV).

20.2 Creating crash dumps for fully virtualized machines

To view crash dumps for FV machines, use the same procedures as for physical machines—Kexec and Kdump.

20.3 Creating crash dumps for paravirtualized machines

Unlike with FVs, Kexec/Kdump does not work in paravirtualized machines. Crash dumps of PV guests must be performed by the host tool stack. If using the xl tool stack for Xen domUs, the xl dump-core command will produce the dump. For libvirt-based VM Guests, the virsh dump command provides the same functionality.

You can configure automatic collection of a core dump with the on_crash setting in the configuration of the VM Guest. This setting tells the host tool stack what to do if the VM Guest encounters a crash. The default in both xl and libvirt is destroy. Useful options for automatically collecting a core dump are coredump-destroy and coredump-restart.

20.4 Additional information

  • The difference between fully virtualized and paravirtualized virtual machines is described in Section 1.4, “Virtualization Modes”.

  • Detailed information about Kexec/Kdump mechanism is included in Chapter 17, Kexec and Kdump.

  • Refer to the xl.cfg manual page (man 5 xl.cfg) for more information on the xl configuration syntax.

  • Refer to https://libvirt.org/formatdomain.html#events-configuration for details about the libvirt XML settings.

→Part IV Managing Virtual Machines with Xen←Chapter 19 QEMU Guest Agent
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