In my NetOps to DevOps Training Plan I mentioned installing KVM, Libvirt and Open vSwitch. I did this a few weeks ago and documented it to produce this tutorial. My motivation was to replace my VMware environment at home with something Open Source. I am also a strong believer in "eat your own dog food" and as a lot of the work I am doing in the Open Source community centers around these 3 technologies, I should get used to using them every day...
Before we get started, I'll assume that you already have a Fedora Minimal Installation that you are ready to work on...
Installing the packages
sudo yum install -y @standard @virtualization openvswitch
That was easy wasn't it!
@standard installs some useful utilities and
@virtualization installs libvirt + KVM
I'm sure you can guess what
Now here comes the fun part!
Configure the services
# Disable NetworkManager sudo systemctl stop NetworkManager.service sudo systemctl disable NetworkManager.service # Enable "Proper" Networking sudo systemctl enable network.service sudo systemctl start network.service # Enable the Open vSwitch service sudo systemctl enable openvswitch.service sudo systemctl start openvswitch.service
Setting up Networking with Open vSwitch
Our networking setup is as follows:
- Single Bridge called
- IP address
To achieve this we need to create/modify the
ifcfg-ovsbr0 scripts in
Using your favorite text editor edit these files as follows, replacing the
HWADDR with the MAC address of your NIC.
DEVICE=eth0 NAME=eth0 ONBOOT=yes DEVICETYPE=ovs TYPE=OVSPort OVS_BRIDGE=ovsbr0 BOOTPROTO=none HWADDR=38:EA:A7:AA:97:3E HOTPLUG=no
Your interface may be called
eth0. In that case you can either
s/eth0/em0/or you can
mv ifcfg-em0 ifcfg-eth0making sure you use the config above.
DEVICE=ovsbr0 ONBOOT=yes DEVICETYPE=ovs TYPE=OVSBridge BOOTPROTO=static IPV6INIT=no DELAY=0 IPADDR=10.10.0.10 NETMASK=255.255.255.0 GATEWAY=10.10.0.254 HOTPLUG=no
NOTE: This does NOT work on Fedora 20 as there is a bug in the current package.
Now you can
sudo reboot and when your machine has rebooted, your new networking configuration will have taken effect.
ip addr 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master ovs-system state UP qlen 1000 link/ether 38:ea:a7:aa:97:3e brd ff:ff:ff:ff:ff:ff inet6 fe80::3aea:a7ff:feaa:973e/64 scope link valid_lft forever preferred_lft forever 4: ovsbr0: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN link/ether 38:ea:a7:aa:97:3e brd ff:ff:ff:ff:ff:ff inet 10.10.0.10/24 brd 10.10.0.255 scope global ovsbr0 valid_lft forever preferred_lft forever inet6 fe80::8482:abff:fe84:6165/64 scope link valid_lft forever preferred_lft forever sudo ovs-vsctl show 21b0f942-5cf8-4479-9eb3-53c418a881b3 Bridge "ovsbr0" Port "ovsbr0" Interface "ovsbr0" type: internal Port "eth0" Interface "eth0" ovs_version: "2.0.0"
Setting up Libvirt to use Open vSwitch
To get LibVirt to use our network by default, we can edit the default network with
sudo virsh net-destory default sudo virsh net-edit default
This will open the XML file in the editor specified in your
EDITOR env variable (
vi by default)
Edit this file to look like this:
<network> <name>default</name> <uuid>61f5a0f8-e81d-4685-9456-b22f03f278ab</uuid> <forward mode='bridge'/> <bridge name='ovsbr0' /> <virtualport type='openvswitch'/> </network>
Once you are done:
sudo virsh net-start default
Installing a Minimal X environment for Virt-Manager
There are many different ways of managing your new Libvirt+KVM install but right now I like Virtual Machine Manager.
First you will need to install an X server on your Fedora machine:
sudo yum install -y @basic-desktop
brew cask install xquartz
Then when we SSH to our Server we add the
-X flag for X11 forwarding.
The above command will open Virtual Machine Manager
If you get an error like
X11 connection rejected because of wrong authentication.you can try
sudo cp .Xauthority /root/which worked for me
Create your first VM!
At this point, you are ready to create your first VM!!!
Open Virtual Machine Manager and follow the wizard for creating a new VM.
- Enter you VM Name and Boot Type
- Select your OS
- Select your Memory and CPU
- Create a Volume for your disk
Now we have a VM.
sudo ovs-vsctl show you can see that Libvirt created a port on your vSwitch for you!
That's all there is to it. Pat yourself on the back and take a break. It feels good to be away from VMware, but I'm not totally happy with Virtual Machine Manager. To that end, I'm looking to augment or replace it with Foreman, but that's a whole other blog post!