Public bug reported:
This appears to be the same bug as this:
https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/997978
Issue
------
Guest networking will randomly drop out and then work again. This is easiest to
be seen by sshing into a guest and running top. After 10-20 minutes I get a
broken pipe. Sometimes I can ssh back in to the guest right away, other times
it gives me an incorrect fingerprint and ssh will refuse as it doesn't match
the know_hosts figerprint. I don't believe this is the vm hosts fingerprint
either but might be mistaken. If I continue to wait I can eventually ssh back
in.
Set up
------
I have a fresh install of ubuntu 12.10 x86_64 server with everything updated
I selected OpenSSH and Virtual Machine Host during installation.
I removed the default virbr0 and set up br0 and br1 manually.
$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
# 10.10.0.x network
auto eth0
iface eth0 inet manual
auto br0
iface br0 inet static
address 10.10.0.201
netmask 255.255.240.0
network 10.10.0.0
broadcast 10.10.15.255
gateway 10.10.0.1
# dns-* options are implemented by the resolvconf package, if installed
dns-nameservers 10.10.0.1
dns-search burnet-int.edu.au
bridge_ports eth0
bridge_fd 0
bridge_stp off
# 203.0.141.x network
auto eth1
iface eth1 inet manual
auto br1
iface br1 inet manual
bridge_ports eth1
bridge_fd 0
bridge_stp off
$ brctl show
bridge name bridge id STP enabled interfaces
br0 8000.001e4f42aa69 no eth0
br1 8000.001e4f42aa6b no eth1
vnet0
$ virsh net-list
Name State Autostart
-----------------------------------------
I created a new user to manage the VMs and added them to the kvm and libvirtd
groups. They don't have access to sudo and the VMs aren't started with sudo.
Created a virtual machine.
$ virt-install --connect qemu:///system \
--name proxy01 --ram 4096 --vcpus 4 \
--disk path=/srv/nfs01/disks/proxy01.raw,format=raw,bus=virtio,cache=none \
--cdrom=/srv/nfs01/images/ubuntu-12.10-server-i386.iso \
--network bridge=br1,model=virtio \
--os-type=linux --os-variant=ubuntuquantal \
--graphics vnc,password=password \
--noautoconsole \
--virt-type=kvm \
--autostart
I only install OpenSSH on the guest and configure the network as:
$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet static
address 203.0.141.2
netmask 255.255.255.0
network 203.0.141.0
broadcast 203.0.141.255
gateway 203.0.141.1
# dns-* options are implemented by the resolvconf package, if installed
dns-nameservers 203.0.141.99 203.0.141.66
dns-search burnet.edu.au
I then start the VM with
$ virsh start proxy01
SSH into proxy01 and run top and I get a broken pipe after 10 or 20
minutes. It's not consistent.
Packages Version
------
$ apt-cache policy qemu-kvm
qemu-kvm:
Installed: 1.2.0+noroms-0ubuntu2.12.10.3
Candidate: 1.2.0+noroms-0ubuntu2.12.10.3
Version table:
*** 1.2.0+noroms-0ubuntu2.12.10.3 0
500 http://au.archive.ubuntu.com/ubuntu/ quantal-updates/main amd64
Packages
100 /var/lib/dpkg/status
1.2.0+noroms-0ubuntu2.12.10.2 0
500 http://security.ubuntu.com/ubuntu/ quantal-security/main amd64
Packages
1.2.0+noroms-0ubuntu2 0
500 http://au.archive.ubuntu.com/ubuntu/ quantal/main amd64 Packages
** Affects: qemu-kvm (Ubuntu)
Importance: Undecided
Status: Confirmed
--
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https://bugs.launchpad.net/bugs/1172091
Title:
KVM guests with bridged network drops out intermittently
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