Bug 819416

Description of problem:

I create three host-only networks for setting up a cluster inside KVM. I install the guests using virt-install. After the guest is taken down, the network disappears from virsh net-list --all. But the xml file remains in /var/lib/libvirtd/networks/ and the bridges and virtual nics are in place. But since network is not visible for libvirtd, it refuses to re-start the guest due a missing network.


Version-Release number of selected component (if applicable):

python-virtinst-0.600.0-5.el6.noarch
libvirt-python-0.9.4-23.el6.x86_64
libvirt-client-0.9.4-23.el6.x86_64
libvirt-0.9.4-23.el6.x86_64
redhat-release-server-6Server-6.2.0.3.el6.x86_64


How reproducible:

Enough for not to get things working at all.

Steps to Reproduce:
1. I created networks (in fedora I also have ip range there, rhel won't handle it):

---------------------
cat >/tmp/fp_net.xml<<EOF
<network>
  <name>fp_commission</name>
</network>
EOF
sudo virsh net-create /tmp/fp_net.xml

cat >/tmp/fp_net_1.xml<<EOF
<network>
  <name>fp_internal_1</name>
</network>
EOF
sudo virsh net-create /tmp/fp_net_1.xml

cat >/tmp/fp_net_2.xml<<EOF
<network>
  <name>fp_internal_2</name>
</network>
EOF
sudo virsh net-create /tmp/fp_net_2.xml
---------------------

2. I created the guests

---------------------
sudo lvcreate -n LV_KVM_fews -L 10G VG_Whipper
sudo virt-install --hvm --network network=default --network network=fp_commission --ram=512 --name=fp-fews --os-type=linux --os-variant=rhel5 --cdrom=/var/lib/libvirt/images/ipxe.iso --disk=/dev/mapper/VG_Whipper-LV_KVM_fews
---------------------

This normally even fails, no need to create the second guest:

---------------------
sudo lvcreate -n LV_KVM_CLA-0 -L 25G VG_Whipper
sudo virt-install --hvm --network network=fp_internal_1,mac=00:50:56:1c:ce:01,model=e1000 \
 --network network=fp_internal_2,mac=00:50:56:1c:ce:11,model=e1000 \
 --network network=fp_commission,model=e1000  --ram=512 --name=fp-cla0 \
 --os-type=linux --disk=/dev/mapper/VG_Whipper-LV_KVM_CLA--0,bus=ide --pxe
---------------------



3.


  
Actual results: At some point network disappears even though the bridge and the configs are there:


---------------------
$ sudo virsh net-dumpxml fp_internal_1
error: failed to get network 'fp_internal_1'
error: Network not found: no network with matching name 'fp_internal_1'

$ sudo virsh net-start fp_internal_1
error: failed to get network 'fp_internal_1'
error: Network not found: no network with matching name 'fp_internal_1'

$ sudo ls /var/lib/libvirt/network
default.xml  fp_commission.xml	fp_internal_1.xml  fp_internal_2.xml

$ sudo cat /var/lib/libvirt/network/fp_internal_1.xml
<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE 
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
  virsh net-edit fp_internal_1
or other application using the libvirt API.
-->

<network>
  <name>fp_internal_1</name>
  <uuid>cc6bfa67-4233-4968-c767-586beb1f4528</uuid>
  <bridge name='virbr1' stp='on' delay='0' />
  <mac address='52:54:00:DB:6D:6C'/>
</network>

$ sudo brctl show
bridge name     bridge id               STP enabled     interfaces
heppa           8000.525400775671       yes             heppa-nic
virbr0          8000.525400d3c89a       yes             virbr0-nic
virbr1          8000.525400db6d6c       yes             virbr1-nic
virbr2          8000.525400e30db6       yes             virbr2-nic
---------------------


Expected results:

The network should be and stay up and guests start fine.

Additional info:

I can recover from the state by taking the interface down, deleting the virbrX bridges, and recreating the networks, but it will loose them again at some point (I'll try to figure out exactly at which point...):


---------------------
$ sudo brctl delif virbr0 virbr0-nic
$ sudo brctl delif virbr1 virbr1-nic
$ sudo brctl delif virbr2 virbr2-nic
$ sudo ip link set down dev virbr0 
$ sudo ip link set down dev virbr1 
$ sudo ip link set down dev virbr2 
$ sudo brctl delbr virbr0
$ sudo brctl delbr virbr1
$ sudo brctl delbr virbr2
$ sudo rm \
/var/lib/libvirt/network/{fp_commission.xml,fp_internal_1.xml,fp_internal_2.xml}
$  sudo virsh net-create /tmp/fp_net.xml
Network fp_commission created from /tmp/fp_net.xml
$ sudo virsh net-create /tmp/fp_net_1.xml
Network fp_internal_1 created from /tmp/fp_net_1.xml
$ sudo virsh net-create /tmp/fp_net_2.xml
Network fp_internal_2 created from /tmp/fp_net_2.xml

$ sudo virsh net-list
Name                 State      Autostart
-----------------------------------------
default              active     yes       
fp_commission        active     no        
fp_internal_1        active     no        
fp_internal_2        active     no        
---------------------