Libvirt via virt-manager virtual network start failed

Question

virt-manager v1.2.1
libvirtd v1.2.16
I tested firewall: iptables && ip6tables work well while.
when I start a virtual network named 'default' (created by libvirt), it occur that:
"Error starting network 'default': internal error: Failed to initialize a valid firewall backend".
thanks for any reply
Last edited by shenhd (2015-06-17 03:56:45)

Answer 1

rob356 wrote:
I had the same problem, but with vagrant and the libvirt provider. I fixed it temporarily by re-building libvirt with a patch that removes the code that throws that error. It looks like in an attempt to fix this bug they went overboard checking if a valid firewall backend was loaded. I commented out that section and everything seems to work fine. Obviously this is not a permanent fix, but I don't know enough about libvirt's codebase to fix it properly. Anyways here is the patch:
--- libvirt-1.2.16.orig/src/util/virfirewall.c 2015-05-23 08:56:12.000000000 -0400
+++ libvirt-1.2.16.new/src/util/virfirewall.c 2015-06-18 10:01:51.954157612 -0400
@@ -932,14 +932,14 @@
virMutexLock(&ruleLock);
- if (currentBackend == VIR_FIREWALL_BACKEND_AUTOMATIC) {
+// if (currentBackend == VIR_FIREWALL_BACKEND_AUTOMATIC) {
/* a specific backend should have been set when the firewall
* object was created. If not, it means none was found.
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("Failed to initialize a valid firewall backend"));
- goto cleanup;
+// virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+// _("Failed to initialize a valid firewall backend"));
+// goto cleanup;
+// }
if (!firewall || firewall->err == ENOMEM) {
virReportOOMError();
goto cleanup;
thx! however, @Basic-Master 's solution is better.