I am having the same issue, and gave an in-depth inspection in my report: bug 1016848
I am running version Essex 2012.1, and networking in VlanManager mode, a dedicated nova-network gateway, KVM and virt-type, Ubuntu 12.04 Precise, and run into this incident in up to every 1-2 days, yesterday even twice within 3 hours. One symptom may be high networking traffic I/O on the given KVM instance. Until now, I worked around by `nova reboot $instance_name`. bradleyd (bradleydsmith), what exactly did you mean by ifdown & ifup? the vnet%d interface or the bridge (e.g. br100) ? What interface did you re-up? -- for the mean time, I'd like to write a tiny daemon that runs on the hypervisor nodes, to check every N secs whether or not it can PING the KVM, and if not, it is to re-up its underlying network interface. Serge Hallyn, I'd like to assist in whatever you need to get this beast fixed, since for me this is also a very major incident, too, and I just can't add more production services until knowing the OpenStack-stack is functioning well. So please tell me what I can provide you with. :-) Regards, Christian. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bridge-utils in Ubuntu. https://bugs.launchpad.net/bugs/997978 Title: KVM images lose connectivity with bridged network To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bridge-utils/+bug/997978/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs