For anyone wondering what nova-agent is on a rackspace cloud server.

/usr/sbin/nova-agent -q -p /var/run/nova-agent.pid -o /var/log/nova-agent.log -l info /usr/share/nova-agent/nova-agent.py</code>
# nova-agent    Startup script for OpenStack nova guest agent
#
# chkconfig: 2345 15 85
# description: nova-agent is an agent meant to run on unix guest instances \
#              being managed by OpenStack nova.  Currently only works with \
#              Citrix XenServer for manipulating the guest through \
#              xenstore.
# processname: nova-agent
# pidfile: /var/run/nova-agent.pid