Very minimal web UI for creating and deleting Libvirt/KVM VMs.
I wrote this quick and dirty system because it seemed the existing web UIs there were for Libvirt/KVM had more dependencies than I wanted to have installed on my VM host. This system is therefore fairly self contained and only dependant on Python and Lighttpd, besides Libvirt and KVM itself of course. No other libraries needed.
As this system was written specifically for a VM host I had, I took the shortcut of hardcoding some paths:
- VM disk images will be created in /srv/vm/
- OS installation ISO image files are expected to be in /srv/iso/
My VM host is a basic Debian 7 installation.
cd /usr/lib
git clone https://github.com/allanrbo/simple-vmcontrol.git
mkdir -p /var/www/html/cgi-bin
ln -s /usr/lib/simple-vmcontrol/cgi-bin/vmcontrol.py /var/www/html/cgi-bin/vmcontrol.py
Allow the web server to switch to root to run the control commands by adding the following to /etc/sudoers
www-data ALL=NOPASSWD: /usr/lib/simple-vmcontrol/vmcontrol/listvm.py
www-data ALL=NOPASSWD: /usr/lib/simple-vmcontrol/vmcontrol/createvm.py
www-data ALL=NOPASSWD: /usr/lib/simple-vmcontrol/vmcontrol/deletevm.py
www-data ALL=NOPASSWD: /usr/lib/simple-vmcontrol/vmcontrol/mountiso.py
www-data ALL=NOPASSWD: /usr/lib/simple-vmcontrol/vmcontrol/startvm.py
www-data ALL=NOPASSWD: /usr/lib/simple-vmcontrol/vmcontrol/stopvm.py
www-data ALL=NOPASSWD: /usr/lib/simple-vmcontrol/vmcontrol/createdatadisk.py
www-data ALL=NOPASSWD: /usr/lib/simple-vmcontrol/vmcontrol/deletedatadisk.py
www-data ALL=NOPASSWD: /usr/lib/simple-vmcontrol/vmcontrol/setautostart.py
Installed lighttpd:
apt-get install lighttpd python
lighttpd-enable-mod cgi
lighttpd-enable-mod ssl
lighttpd-enable-mod auth
cd /etc/lighttpd/
openssl genrsa -out server.key 2048
openssl req -new -key server.key -subj "/CN=server" -x509 -days 3650 -out server.crt
cat server.crt server.key > server.pem
chmod 400 server.pem
Configured lighttpd by adding a file /etc/lighttpd/conf-enabled/myserver.conf:
# Only allow https on vmcontrol.py
$HTTP["scheme"] == "http" {
$HTTP["url"] =~ "^/cgi-bin/vmcontrol.py" {
url.access-deny = ("")
}
}
# Require login for vmcontrol.pyn
$HTTP["url"] =~ "^/cgi-bin/vmcontrol.py" {
auth.backend = "htpasswd"
auth.backend.htpasswd.userfile = "/etc/lighttpd/htpasswd"
auth.require = ( "" => (
"method" => "basic",
"realm" => "",
"require" => "valid-user"
))
}
Created the file /etc/lighttpd/htpasswd with credentials I wanted to use (for example use http://aspirine.org/htpasswd_en.html ).
Restarted Lighttpd for changes to take effect:
/etc/init.d/lighttpd restart
Installed KVM and Libvirt:
apt-get install qemu-kvm virtinst bridge-utils libvirt-clients libvirt-daemon-system
Modified /etc/network/interfaces
allow-hotplug eno1
iface eno1 inet manual
auto br0
iface br0 inet dhcp
bridge_ports eno1
Created folder for VM disk images and relocated folder containing save states:
mkdir /srv/iso
mkdir /srv/vm
mv /var/lib/libvirt/ /srv/libvirt ; ln -s /srv/libvirt /var/lib/libvirt
Modified /etc/init.d/libvirt-guests
ON_BOOT=start
ON_SHUTDOWN=suspend
Simple VM Control UI is licensed under the MIT license.
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