Red Hat Security Advisory 2014-1691-01 - PackStack is a command-line utility that uses Puppet modules to support rapid deployment of OpenStack on existing servers over an SSH connection. PackStack is suitable for deploying both single node proof-of-concept installations and more complex multi-node installations. It was discovered that the nova.conf configuration generated by PackStack did not correctly set the libvirt_vif_driver configuration option if the Open vSwitch monolithic plug-in was not used. This could result in deployments defaulting to having the firewall disabled unless the nova configuration was manually modified after PackStack was started.
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