VM Fails to Boot With: 'Unable to find security driver for label apparmor'

Problem

A virtual machine (VM) is unable to boot up with the following fault message.

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{u'message': u'unsupported configuration: Unable to find security driver for label apparmor', u'code': 500}

Environment

• Platform9 Managed OpenStack - v3.6.0 and higher
• AppArmor
• Ubuntu 14.04

Cause

The VMs' libvirtd process is a part of the AppArmor security module.

Resolution

1. Remove the VM's libvirtd process from apparmor by running the command.

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apparmor_parser -R /etc/apparmor.d/libvirt/libvirt-[__vm-uuid__]

2. Open the XML definition of the VM for editing.

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$ virsh edit [vm_uuid]

3. Scroll to the end of the file until you see this line.

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[seclabel type='dynamic' model='apparmor' relabel='yes'/]

Change it to the following.

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[seclabel type='none'/]

4. If the VM was in a ShutOff state initially, start the VM from a virsh perspective.

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virsh start [__vm_uuid__]

5. If you are editing the XML of an already running instance you will have to stop and start VMs for the changes to take effect.

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$ openstack server stop$ openstack server start

Additional Information

Please see the official AppArmor Documentation for more details on working with this Mandatory Access Control (MAC) mechanism.