Installing Docker Breaks KVM

Bug #1353923 reported by jean-christophe manciot
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
docker.io (Ubuntu)
Fix Released
Undecided
Unassigned

Bug Description

Installing Docker 0.9.1 on Ubuntu 14.04 Desktop:

    - creates a new bridge "docker0"
    - deletes virbr0

Since thern, I've never been able to restore the correct environment for KVM, even by uninstalling docker.

If I try to manually add the "bridge" with *brctl addbr virbr0*, the creation does not survive across reboots and:

virsh net-start default

error: Failed to start network default
error: Unable to create bridge virbr0: File exists

Very strange error.

What must be done to solve or workaround that issue?
Any help will be greatly appreciated.

Revision history for this message
Tianon Gravi (tianon) wrote :

Just to note, this was also reported upstream at https://github.com/docker/docker/issues/7462

Revision history for this message
jean-christophe manciot (manciot-jeanchristophe) wrote :

I know, I"m the source of both messages.

- The fact that Docker deletes default virbr0 is not correct.
- However, I've found the reason why it was impossible for me to create the default bridge back: there is a conflict between dhcp-helper and libvirt regarding DHCP Server.
 The solution is to replace dhcp-helper by isc-dhcp-relay and to configure the last one so that it listens on ***NON virtual*** interfaces.

Revision history for this message
Michael Hudson-Doyle (mwhudson) wrote :

Closing, based on upstream report.

Changed in docker.io (Ubuntu):
status: New → Fix Released
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