Public bug reported:

Having deployed vivid-kilo-proposed with openstack-charm-testing, I'm initially 
unable to launch instances, because ovs-vsctl errors out:
ovs-vsctl: unix:/var/run/openvswitch/db.sock: database connection failed 
(Protocol error)

Restarting openvswitch-switch resolves the issue:
$ juju ssh nova-compute/0 sudo systemctl restart openvswitch-switch.service

See attached a nova-compute.log from one of the units where this failed.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: openvswitch-switch 2.3.1-0ubuntu1
ProcVersionSignature: User Name 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
Date: Fri May  8 09:19:37 2015
Ec2AMI: ami-00000360
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: m1.medium
Ec2Kernel: aki-00000002
Ec2Ramdisk: ari-00000002
SourcePackage: openvswitch
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: openvswitch (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug ec2-images vivid

** Attachment added: "nova-compute.log"
   
https://bugs.launchpad.net/bugs/1453062/+attachment/4393555/+files/nova-compute.log

** Summary changed:

- ovs-vctl fails with Protocol error until restarted
+ ovs-vsctl fails with Protocol error until restarted

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https://bugs.launchpad.net/bugs/1453062

Title:
  ovs-vsctl fails with Protocol error until restarted

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