Bug 39334 – Upgrade restarts network bridge - breaks running VM connections

Bug 39334 - Upgrade restarts network bridge - breaks running VM connections


Summary:	Upgrade restarts network bridge - breaks running VM connections

Status:	CLOSED WORKSFORME

Product:	UCS
Classification:	Unclassified
Component:	Virtualization - KVM
Version:	UCS 4.2
Hardware:	Other Linux

Importance:	P5 normal (vote)
Target Milestone:	UCS 4.0-x
Assigned To:	UCS maintainers
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Depends on:	30590
Blocks:
	Show dependency tree / graph

Reported:	2015-09-14 08:57 CEST by Philipp Hahn
Modified:	2023-06-28 10:46 CEST (History)
CC List:	2 users (show)

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What kind of report is it?:	Bug Report
What type of bug is this?:	5: Major Usability: Impairs usability in key scenarios
Who will be affected by this bug?:	2: Will only affect a few installed domains
How will those affected feel about the bug?:	2: A Pain – users won’t like this once they notice it
User Pain:	0.114
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Description Philipp Hahn

2015-09-14 08:57:57 CEST

During a release upgrade of the host (again no working network connection during UCS installation) the running VMs were disconnected from the bridge "br0", as the update installed some new "univention-base-config" (or what-ever) files, which restarted the network configuration. This downs and ups the bridge "br0", but does not restore the "vnetX" TAP interfaces of the running KVM VMs.

A manual "/sbin/brctl addif br0 vnetX" solved the problem.
Suspending and resuming the VM would have solved it as well.

We should either add logic to restore the connected bridge interfaces if a bridge is restarted, or could set "interfaces/restart/auto=no" on KVM servers.

UCS Technical Training Issue #2090

Comment 1 Philipp Hahn

2017-04-21 16:29:37 CEST

We have ucs-kvm-reconnect-bridge from Bug #30590