libvirt users - Jun 2013 - Re: Enabling route_localnet on private network

I have an issue setting a persistent kernel option on a libvirt net device since
that device does not exist early enough during the boot of the KVM host.

I am using the 127.0.0.0 local net for cluster communication between the KVM
host and its guests as well as between KVM guests.  In order to use addresses on
the 127.0.0.0/8 network, which is reserved for local communication, two
configuration changes must be made after the system is rebooted.  First the
default route of 127.0.0.1/0 to the loopback device must be deleted which I did
by adding an "ip route delete" command to the ifcfg-br0 file that
starts the bridged network that is used by the KVM guests.  The second
configuration change is where I am having trouble. For the second change I need
to set the kernel boolean net.ipv4.conf.pvt0.route_localnet to be true to allow
routing of the 127.0.0.0/8 on the libvirt net device that I have configured to
use addresses on the 127.0.0.0/8 network.  Normally I would do this by adding
"net.ipv4.conf.pvt0.route_localnet = 1" to /etc/sysctl.conf but this
does not work because the libvirt pvt0 device does not exist when the settings
in the /etc/sysctl.conf are done.

My question is where can I add the command "/sbin/sysctl -w
net.ipv4.conf.pvt0.route_localnet=1" to the start-up files so the command
is run after the libvirt device pvt0 has been autostarted?

I am running on RHEL 6.4 x86_64.

  --jim

My question is where can I add the command "/sbin/sysctl
-w
> net.ipv4.conf.pvt0.route_localnet=1" to the start-up files so the
command
> is run after the libvirt device pvt0 has been autostarted?
>
 Does libvirt hooks can do this ?http://libvirt.org/hooks.html

Gao,
It looks like these hooks will do exactly what I need.
Thanks for the pointer...
  --jim
________________________________
From: Gao Yongwei [itxx00@gmail.com]
Sent: Friday, June 14, 2013 8:36 PM
To: McEvoy, James
Cc: libvirt-users@redhat.com
Subject: Re: [libvirt-users] Enabling route_localnet on private network



My question is where can I add the command "/sbin/sysctl -w
net.ipv4.conf.pvt0.route_localnet=1" to the start-up files so the command
is run after the libvirt device pvt0 has been autostarted?
 Does libvirt hooks can do this ?http://libvirt.org/hooks.html