Difference between revisions of "Virsh"

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* <code>[[/virsh pool-define/]]</code> (create '''persistent''' storage from options from XML file)<ref>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</ref>
 
* <code>[[/virsh pool-define/]]</code> (create '''persistent''' storage from options from XML file)<ref>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</ref>
 
* <code>[[/virsh pool-define-as/]]</code> (create '''persistent''' storage from  options from command line)<ref>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</ref>
 
* <code>[[/virsh pool-define-as/]]</code> (create '''persistent''' storage from  options from command line)<ref>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</ref>
* <code>[[/virsh pool-event/]]</code>
+
* <code>[[virsh pool-event]]</code>
 
* <code>[[virsh reboot]]</code>
 
* <code>[[virsh reboot]]</code>
 
* <code>virsh restore</code>
 
* <code>virsh restore</code>
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* <code>virsh set-lifecycle-action</code>. Added in November 2017 (v.3.9.0)<ref>https://libvirt.org/news.html</ref>
 
* <code>virsh set-lifecycle-action</code>. Added in November 2017 (v.3.9.0)<ref>https://libvirt.org/news.html</ref>
 
* <code>[[virsh setmaxmem]]</code>
 
* <code>[[virsh setmaxmem]]</code>
* <code>[[virsh/virsh setmem|virsh setmem]]</code>
+
* <code>[[virsh setmem]]</code>
** <code>[[virsh/virsh setmem|virsh setmem]] —-config</code>
+
** <code>[[virsh setmem]] —-config</code>
* <code>[[/virsh snapshot-create-as/]]</code>
+
* <code>[[virsh snapshot-create-as]]</code>
* <code>[[virsh/virsh start|virsh start]]</code>
+
* <code>[[virsh start]]</code>
 
* <code>virsh suspend</code>
 
* <code>virsh suspend</code>
 
* <code>virsh save</code>
 
* <code>virsh save</code>
* <code>[[virsh/virsh shutdown|virsh shutdown]]</code>
+
* <code>[[virsh shutdown]]</code>
 
* <code>[[/virsh undefine/]]</code>
 
* <code>[[/virsh undefine/]]</code>
 
* <code>virsh update-device</code>
 
* <code>virsh update-device</code>
* <code>[[virsh/virsh vcpuinfo|virsh vcpuinfo]]</code>
+
* <code>[[virsh vcpuinfo]]</code>
  
 
== Getting Information ==
 
== Getting Information ==

Revision as of 14:06, 5 January 2020

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

  • virsh
  • virsh -r

All Commands

Getting Information

  • List Running Virtual Machines: virsh list[12][13]
    • virsh list --name
    • List all Virtual Machines: virsh list --all
  • View configuration: /virsh dumpxml/ {guest-id, VM_NAME or uuid} > yourfilename.xml[14]
    • Virtual interfaces: virsh domiflist VM_NAME

Network info:

Storage info:


Guest info:

Operations

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

Virsh Storage Information

All Storage commands

KVM virsh Snapshots

/Virsh CPU Commands/

Virsh Memory Commands

virsh Memory Commands: virsh setmaxmem, virsh setmem, virsh dommemstat

QEMU

  • 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

  • virsh net-autostart autostart a network
  • virsh net-create create a network from an XML file
  • virsh net-define define an inactive persistent virtual network or modify an existing persistent one from an XML file
  • virsh net-destroy destroy (stop) a network
  • virsh /net-dhcp-leases/ print lease info for a given network
  • /virsh net-dumpxml/ NET_NAME network information in XML
  • virsh net-edit edit XML configuration for a network
  • virsh net-event Network Events
  • virsh /net-info/ network information
  • virsh net-list list networks
  • virsh net-name convert a network UUID to network name
  • virsh net-start start a (previously defined) inactive network
  • virsh net-undefine undefine a persistent network
  • virsh net-update update parts of an existing network's configuration
  • virsh net-uuid convert a network name to network UUID

Activities

  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/virsh console command
  4. Learn difference between /virsh define/ and /virsh create/
  5. /Create Live backups/ with active virsh blockcommit[20]
  6. KVM/Offline Migrate or move a virtual machine between two KVM servers without shared storage[21]: virsh dumpxml and virsh define

See also

References

  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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