Your OpenStack services should boot automatically when you reboot your system. This is part of the configuration that Packstack performs on your system.

As with any services under CentOS, you can use chkconfig to see what is enabled at boot:

# chkconfig --list

This will produce a list that includes output something like this:

openstack-nova-api           0:off   1:off  2:on  3:on  4:on  5:on  6:off
openstack-nova-cert          0:off   1:off  2:on  3:on  4:on  5:on  6:off
openstack-nova-compute       0:off   1:off  2:on  3:on  4:on  5:on  6:off
openstack-nova-conductor     0:off   1:off  2:on  3:on  4:on  5:on  6:off
openstack-nova-console       0:off   1:off  2:off  3:off  4:off  5:off  6:off
openstack-nova-consoleauth   0:off   1:off  2:on  3:on  4:on  5:on  6:off
openstack-nova-metadata-api  0:off   1:off  2:on  3:on  4:on  5:on  6:off

This is a list of service names, followed by their on and off status for each runlevel. Typically, if you see that the service is enabled in runlevel 3 (3:on) on a server or runlevel 5 (5:on) on a desktop, it will start when your system boots