here's a hack you can use to restart one subsystem:
#!/bin/bash
srv=$1
if [ $# -eq 2 ]
then
action=$2
else
action=restart
fi
echo usage action $action
cd /etc/init/; for i in $(ls $srv-* | cut -d \. -f 1 | xargs); do sudo service $i $action; done
and invoke with e.g. 'nova' or 'neutron' or 'cinder' etc.
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