KVM

Debian

apt install qemu-kvm libvirt-clients libvirt-daemon-system

Fedora 28

I had removed zfs-fuse, which also removed a number of kvm modules that I needed. To re-install I was able to follow the following link

sudo dnf install libvirt-daemon
sudo systemctl enable libvirtd
sudo systemctl start libvirtd
sudo dnf install qemu-kvm qemu-img libvirt-python python-virtinst libvirt-client virt-install virt-viewer device-mapper-libs libvirt-daemon-driver-qemu libvirt-daemon-config-network libvirt-daemon-kvm

Create Storage Domain

I have a ZFS pool already established, with several volumes in use. I will be creating a new volume dedicated to this purpose and will set it as one of two pools. The other being the ISO directory where I keep ISOs.

virsh # pool-list
 Name                 State      Autostart 
-------------------------------------------
 default              active     yes              
 michael              active     yes       
 qemu                 active     yes       

virsh # pool-autostart --pool default --disable 
Pool default unmarked as autostarted

virsh # pool-undefine --pool default 
Pool default undefined

virsh # pool-autostart --pool michael --disable 
Pool michael unmarked as autostarted


virsh # pool-list 
 Name                 State      Autostart 
-------------------------------------------
 default              active     no        
 localstorage         active     no        
 michael              active     no        
 qemu                 active     no        

Now I can create the new pool. I am going to use the most basic config options.

virsh # pool-create-as default --type dir --target /raid5/libvirt
Pool default created

virsh # pool-autostart --pool default
Pool default marked as autostarted

virsh # pool-list
 Name                 State      Autostart 
-------------------------------------------
 default              active     yes               
 michael              active     no        
 qemu                 active     no        

virsh # 

Remove Default Network

To remove the default network from the host. This can conflict with other services running if this is a shared environment. In my case I run a DNS server off the host, and the default network uses DNS forwarding with dnsmasq. When dnsmasq is running it takes port 53 which prevents my DNS service from running.

[root@nas ~]# virsh
Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
       'quit' to quit

virsh # net-destroy default
Network default destroyed

virsh # net-list
 Name                 State      Autostart     Persistent
----------------------------------------------------------

virsh # exit

Setup Bridged Network

I already had a bridge created for LXC containers, it only made sense to use it for KVM guests as well.

• Create the XML file. My existing bridge name is virb0.

<network>
  <name>bridge1</name>
  <bridge name="virbr0" />
  <forward mode="bridge" />
</network>

• Create the network using virsh

virsh # net-list 
 Name                 State      Autostart     Persistent
----------------------------------------------------------

vvirsh # net-define --file br.xml 
Network bridge1 defined from br.xml

virsh # net-list 
 Name                 State      Autostart     Persistent
----------------------------------------------------------

virsh # net-start --network bridge1
Network bridge1 started

virsh # net-list 
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 bridge1              active     no            yes

• Set to auto start

virsh # net-autostart --network bridge1
Network bridge1 marked as autostarted