Install libvirtd

Recently I installed Fedora 25 to test some playbooks and other configurations. A co-worker mentioned to use Vagrant but, my exposure was minimal. I only used vagrant to test some applications such as netbox and it uses Virtualbox by default. Previously I have used Virtualbox and Vmware but, I decided to move away from those. First, Virtualbox breaks everytime there is a kernel update. Although there is some commands you can run to recreate the kernel it needs but, why I should do this all the time? Second, every time I installed a VM, the usage of the HDD went over 105% in atop!. Vmware is great but, they removed a lot of good features, higher price and getting a license is a pain. After running into this issue, I decided to try out libvirt since I found out in can be used with vagrant. You can start installing libvirt with groupinstall:

sudo dnf groupinstall "Virtualization"

Install this extra rpms.

sudo dnf install qemu-kvm virt-install virt-manager

Make sure this services are enabled and started

sudo systemctl enable libvirtd
sudo systemctl start libvirtd
sudo systemctl enable virtlogd
sudo systemctl start virtlogd
sudo systemctl enable network
sudo systemctl start network

Since I wanted to create the VM’s and access them over the network, I needed to create a bridge. By default, libvirt creates a network with NAT. This is the steps I took:

sudo systemctl stop NetworkManager
sudo systemctl disable NetworkManager

You should have an int automatically created when you installed the OS. You can find the name of it by running:

ls /etc/sysconfig/network-scripts/

In my case it was named ifcfg-eno1. Edit the interface:

sudo vim /etc/sysconfig/network-scripts/ifcfg-eno1
# add TYPE=Bridge save and close

Restart network services

sudo systemctl restart network

After a while I lost connection to the network and internet. I restarted network and got this error Determining IP information for br0.. /usr/sbin/dhclient-script: line 704: /etc/resolv.conf file not found I tried to touch the file but, it did not even let me permission denied. After doing ls -laht /etc/resolv.conf I noticed that the file was linked to /var/run/NetworkManager/resolv.conf but, it was missing. By recreating the file at this location and restarting NetworkManager everything seemed to start working. I restarted network and ping and got a response! Later, I researched into this issue and turns out you don’t have to turn off NetworkManager anymore. Turning off and disabling NetworkManager gets rid of the link to /var/run/NetworkManager/resolv.conf and the network service cannot resolve without this file.

After restarting my server after patches, I lost connection to the internet again. Turns out /etc/resolv.conf is missing again. I had to do:

sudo touch /etc/resolv.conf
sudo systemctl restart network

I got connection again and was able to download more ISO’s for the server builds. But, this happens every time there is a restart. I reported this issue fedora bugzilla and see if its a bug.

Finally check the bridge interfaces.

brctl show

At this point everything should be running and working. I created my VM’s using virt-manager and tested some ansible roles.

NOTE: I decided to reinstall my OS and try to use software RAID 1 for everything. Using the HDD’s I have available below and performance has been great.

[2:0:0:0]    disk    ATA      WDC WD10EZEX-00B 1A01  
[3:0:0:0]    disk    ATA      WDC WD10EZEX-00B 1A01