Virsh

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virsh[1][2] is a command line utility for managing virsh guest domains/virtual machines and the hypervisor[3]. Can be used to operate vm like create, list, start, shutdown or suspend and to manage storage, snapshots and checkpoints[4] among other actions. virt-manager is a graphical alternative to virsh. It supports Xen, QEMU, KVM, LXC, OpenVZ, VirtualBox and VMware ESX.

virsh is include in libvirt-client package in RHEL and Ubuntu and uses libvirt management API. Binaries included:

Basic Commands[edit]

  • virsh
  • virsh -r

All Commands[edit]

Getting Information[edit]

  • View configuration:
    • virsh dumpxml {guest-id, VM_NAME or uuid} > yourfilename.xml[14]
    • Virtual interfaces: virsh domiflist VM_NAME

Network info:

Storage info:

Display info:

Guest info:

Operations[edit]

Changing VM running status operations:

Snapshots:

Migrations:

  • virsh migrate --live GuestName DestinationURL
  • virsh migrate --offline[17] (copying non-shared storage or other file based storages (e.g. UEFI variable storage) is not supported during offline migration)

Configuration:

Virsh Storage commands[edit]

Virsh Storage Information[edit]

All Storage commands[edit]

Virsh Snapshots[edit]

Virsh CPU Commands[edit]

Virsh Memory Commands[edit]

virsh Memory Commands: virsh setmaxmem, virsh setmem

QEMU[edit]

  • virsh qemu-attach QEMU Attach
  • virsh qemu-monitor-command QEMU Monitor Command
  • virsh qemu-monitor-event QEMU Monitor Events
    • virsh qemu-monitor-event VM_MACHINE_NAME
  • virsh qemu-agent-command QEMU Guest Agent Command

Networking[edit]

Activities[edit]

  1. Review virsh command cheatsheet https://computingforgeeks.com/virsh-commands-cheatsheet/
  2. Read https://github.com/libvirt/libvirt/blob/master/tools/virsh.c source code.
  3. Enable access to your VM Machines via virsh console command
  4. Learn difference between virsh define and virsh create
  5. Create Live backups with active virsh blockcommit[20]
  6. Offline Migrate or move a virtual machine between two KVM servers without shared storage[21]: virsh dumpxml and virsh define

See also[edit]

References[edit]

  1. http://manpages.ubuntu.com/manpages/xenial/man1/virsh.1.html
  2. https://github.com/libvirt/libvirt/blob/master/tools/virsh.c
  3. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/virtualization/chap-virtualization-managing_guests_with_virsh
  4. https://github.com/libvirt/libvirt/commit/689beaa47c51fb49fafa992dd468116b8f6b0782#diff-f41fa7374ab97c527387ea4ce48fd04e
  5. https://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit
  6. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/virtualization_deployment_and_administration_guide/sect-using_the_qemu_guest_virtual_machine_agent_protocol_cli-libvirt_commands
  7. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/virtualization_deployment_and_administration_guide/sect-using_the_qemu_guest_virtual_machine_agent_protocol_cli-libvirt_commands
  8. https://serverfault.com/questions/434064/correct-way-to-move-kvm-vm
  9. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/configuring_and_managing_virtualization/index#creating-storage-for-virtual-machines-using-the-cli_managing-storage-for-virtual-machines-using-the-cli
  10. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/configuring_and_managing_virtualization/index#creating-storage-for-virtual-machines-using-the-cli_managing-storage-for-virtual-machines-using-the-cli
  11. https://libvirt.org/news.html
  12. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/virtualization/chap-virtualization-managing_guests_with_virsh
  13. https://help.ubuntu.com/community/KVM/Managing
  14. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/virtualization_deployment_and_administration_guide/sect-domain_commands-creating_a_virtual_machine_xml_dump_configuration_file
  15. https://fossies.org/linux/libvirt/NEWS
  16. https://libvirt.org/news.html
  17. https://libvirt.org/migration.html#offline
  18. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/configuring_and_managing_virtualization/index#creating-storage-for-virtual-machines-using-the-cli_managing-storage-for-virtual-machines-using-the-cli
  19. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/configuring_and_managing_virtualization/index#creating-storage-for-virtual-machines-using-the-cli_managing-storage-for-virtual-machines-using-the-cli
  20. https://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit
  21. https://serverfault.com/questions/434064/correct-way-to-move-kvm-vm
  22. https://github.com/virt-manager/virt-manager/tree/master/virtinst
  23. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_virtualization/getting-started-with-virtualization-in-rhel-8_configuring-and-managing-virtualization

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