KVM

List, Start and Stop guest machines

Use the virtualisation shell command, virsh

List running Guests:-

[root@kvmhost ~]# virsh list
 Id Name                 State
----------------------------------
  1 quincekvm            running
  2 elastixkvm           running
  8 pearkvm              running

List all Guests

[root@kvmhost ~]# virsh list --all
 Id    Name                           State
----------------------------------------------------
 23    lithium                        running
 24    neon                           running
 -     gy-rpt                         shut off
 -     nw65-01                        shut off

Set Guest to Auto Start:-

[root@vm2 ~]# virsh autostart quincekvm
Domain quince marked as autostarted

Stop and start Guest:-

[root@vm2 ~]# virsh shutdown elastixkvm
Domain elastixkvm is being shutdown
  
[root@vm2 ~]#
 
[root@vm2 ~]# virsh start elastixkvm
Domain elastixkvm started
 
[root@vm2 ~]# 

Import xml file

root@optiplex ~]# virsh create /etc/libvirt/qemu/hydrogen.xml
Domain hydrogen created from /etc/libvirt/qemu/hydrogen.xml

[root@optiplex ~]# virsh list --all
 Id    Name                           State
----------------------------------------------------
...edited...
 25    hydrogen                       running

Convert image to suitable format for KVM

Source was image used on VMware originally, this needed to be imported to KVM.

[root@optiplex nw65-01]# ls -l
drwxr-xr-x 2 root root       4096 Apr 25  2015 Logs
-rw------- 1 root root 1036648448 Apr 25  2015 nw65-01-disk1.vmdk

[root@optiplex nw65-01]# file nw65-01-disk1.vmdk 
nw65-01-disk1.vmdk: VMware4 disk image


[root@optiplex nw65-01]# qemu-img convert -f vmdk -O qcow2 nw65-01-disk1.vmdk nw65-01-disk1.qcow

[root@optiplex nw65-01]# ls -l
total 2024672
drwxr-xr-x 2 root root       4096 Apr 25  2015 Logs
-rw-r--r-- 1 root root 1036648448 Sep  6 13:04 nw65-01-disk1.qcow
-rw------- 1 root root 1036648448 Apr 25  2015 nw65-01-disk1.vmdk


[root@optiplex nw65-01]# file nw65-01-disk1.qcow
nw65-01-disk1.qcow: Qemu Image, Format: Qcow , Version: 2
[root@optiplex nw65-01]# 

Despite being the same file size, the original vmdk and the new qcow2 images are different:-

[root@optiplex nw65-01]# md5sum nw65-01-disk1.qcow
1dd9fbb4ffe33caaa22b57f510494fff  nw65-01-disk1.qcow

[root@optiplex nw65-01]# md5sum nw65-01-disk1.vmdk 
375f4632b70a655f92d8d2c9b0dc4bcb  nw65-01-disk1.vmdk
[root@optiplex nw65-01]#

Storage Pools

Storage pool is showing as inactive in web gui:-

root@kvm01:/data/iso# virsh pool-list --all
 Name                 State      Autostart 
-------------------------------------------
 default              active     yes       
 iso                  inactive   yes       
 vm01                 active     yes       

root@kvm01:/data/iso# virsh pool-start iso
Pool iso started

root@kvm01:/data/iso# virsh pool-list --all
 Name                 State      Autostart 
-------------------------------------------
 default              active     yes       
 iso                  active     yes       
 vm01                 active     yes       

rb/kvm.txt · Last modified: 15/06/2017 15:17 (external edit)