The same problem exists in downstream vdsm.

+++ This bug was initially created as a clone of Bug #1154399 +++

Description of problem:
I configure oVirt node with ovirtmgmt-interface. It's UP in ovirt-engine, but when I reboot node - it boots and after few second i lost connectivity. I connect to node via IPMI and in /etc/sysconfig/network-scripts/ there no ifcfg-bond0.X and ifcgf-ovirtmgmt.

Also vdsm daemon didn't start:
 service vdsmd start
libvirtd start/running, process 6113
vdsm: Running mkdirs
vdsm: Running configure_coredump
vdsm: Running configure_vdsm_logs
vdsm: Running run_init_hooks
vdsm: Running check_is_configured
libvirt is already configured for vdsm
vdsm: Running validate_configuration
SUCCESS: ssl configured to true. No conflicts
vdsm: Running prepare_transient_repository
vdsm: Running syslog_available
vdsm: Running nwfilter
vdsm: Running dummybr
vdsm: Running load_needed_modules
vdsm: Running tune_system
vdsm: Running test_space
vdsm: Running test_lo
vdsm: Running unified_network_persistence_upgrade
vdsm: Running restore_nets
Traceback (most recent call last):
  File "/usr/share/vdsm/vdsm-restore-net-config", line 137, in <module>
    restore()
  File "/usr/share/vdsm/vdsm-restore-net-config", line 123, in restore
    unified_restoration()
  File "/usr/share/vdsm/vdsm-restore-net-config", line 66, in unified_restoration
    persistentConfig.bonds)
  File "/usr/share/vdsm/vdsm-restore-net-config", line 91, in _filter_nets_bonds
    bonds[bond]['nics'], net)
KeyError: u'bond0'
vdsm: stopped during execute restore_nets task (task returned with error code 1).
vdsm start                                                 [FAILED]

It starts only if i manually restore network configutaion, delete /var/lib/vdsm/persistence/netconf  and create nets_restored file in /var/lib/vdsm 

Version-Release number of selected component (if applicable):
rpm -qa | grep vdsm
vdsm-python-4.16.7-1.gitdb83943.el6.noarch
vdsm-jsonrpc-4.16.7-1.gitdb83943.el6.noarch
vdsm-python-zombiereaper-4.16.7-1.gitdb83943.el6.noarch
vdsm-xmlrpc-4.16.7-1.gitdb83943.el6.noarch
vdsm-yajsonrpc-4.16.7-1.gitdb83943.el6.noarch
vdsm-4.16.7-1.gitdb83943.el6.x86_64
vdsm-cli-4.16.7-1.gitdb83943.el6.noarch

cat /etc/redhat-release
CentOS release 6.5 (Final)


Steps to Reproduce:
1. configure network manually in /etc/sysconfig/network-scripts/
2. add node to ovirt-engine
3. reboot node

Actual results:
Lost connectivity to node, vdsm scripts reset network configuration

Expected results:
normal reboot

Additional info:

--- Additional comment from Aleksandr on 2014-10-20 02:12:17 EDT ---

I found the problem and how to solve it manually. 

I create bond interface manually by hand before installation of oVirt, and create ovirtmgmt interface manually to. After i install oVirt to node - VDSM scripts create folders with network configuration in var/lib/vdsm/persistence/netconf/ and there is folder "nets" with configutarion of ovirtmgmt interface, but there is no folder bonds for bonding configs.

After creation of this folder with configuration for bond0 interface all starts to work and reboot normally.

--- Additional comment from Dan Kenigsberg on 2014-10-25 20:55:59 EDT ---

Toni, could you take a look? I thought http://gerrit.ovirt.org/32769 should have fixed that.

--- Additional comment from Antoni Segura Puimedon on 2014-10-27 03:52:13 EDT ---

@Aleksandr: Does the /etc/sysconfig/network-scripts/ifcfg-bond0 you manually create have any of these headers:

- '# Generated by VDSM version'
- '# automatically generated by vdsm'

If that is the case, they will be removed at every boot. If that is not the case, are you calling 'persist /etc/sysconfig/network-scripts/ifcfg-bond0' in the command line after creating them?

vdsm only persists the networks and bonds it creates and since ifcfg-bond0 is created by you, it assumes (wrongly or not) it will be there on boot. There are three ways to go about this:

- creating the bond with vdsClient like so:
  vdsClient -s 0 setupNetworks bondings='{bond11:{nics:p1p3+p1p4}}'
  # Then create the network over it (which will persist the bond too in /var/lib/vdsm/persistence/netconf/bonds
- Using the node persistence directly:
  persist /etc/sysconfig/network-scripts/ifcfg-bond0
- Code: Somehow detect that device configuration we depend on is not persisted and do like in the upgrade script to unified persistence.

--- Additional comment from Aleksandr on 2014-10-27 04:11:43 EDT ---

(In reply to Antoni Segura Puimedon from comment #3)
> @Aleksandr: Does the /etc/sysconfig/network-scripts/ifcfg-bond0 you manually
> create have any of these headers:
> 
> - '# Generated by VDSM version'
> - '# automatically generated by vdsm'
> 
> If that is the case, they will be removed at every boot. If that is not the
> case, are you calling 'persist /etc/sysconfig/network-scripts/ifcfg-bond0'
> in the command line after creating them?
> 
> vdsm only persists the networks and bonds it creates and since ifcfg-bond0
> is created by you, it assumes (wrongly or not) it will be there on boot.
> There are three ways to go about this:
> 
> - creating the bond with vdsClient like so:
>   vdsClient -s 0 setupNetworks bondings='{bond11:{nics:p1p3+p1p4}}'
>   # Then create the network over it (which will persist the bond too in
> /var/lib/vdsm/persistence/netconf/bonds
> - Using the node persistence directly:
>   persist /etc/sysconfig/network-scripts/ifcfg-bond0
> - Code: Somehow detect that device configuration we depend on is not
> persisted and do like in the upgrade script to unified persistence.

/etc/sysconfig/network-scripts/ifcfg-bond0 doesn't have such header. I create it manually before installing oVirt on this node.

--- Additional comment from Dan Kenigsberg on 2014-10-29 10:08:58 EDT ---

And when you run

 persist /etc/sysconfig/network-scripts/ifcfg-bond0

does the problem go away? If so - it's not a bug. Manual creation requires manual persistence.

--- Additional comment from Dan Kenigsberg on 2014-11-17 11:25:48 EST ---

(In reply to Dan Kenigsberg from comment #5)
> does the problem go away?

Please reopen if this is not the case.

--- Additional comment from Dan Kenigsberg on 2015-02-07 12:20:56 EST ---

We have heard more reports about our failure to revive bonds that where created outside Vdsm, but required by its networks.

Since this is a common use case, particularly for hosted engine, it may require extreme measures such as consuming these bonds and making the ours.