This is an extension package for OpenStack Nova of grizzy version published in May 2013, follows are steps of applying this package into Nova.

1. Copy this pakage (the myproject dir) into /opt/stack/nova/nova dir.

2. Fileter Configuration.
    Add Following lines into the [DEFAULT] group of nova.conf.
       scheduler_available_filters=nova.scheduler.filters.standard_filters
       scheduler_available_filters=nova.myproject.specified_host_filter.SpecifiedHostFilter
       scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,TrustedFilter,SpecifiedHostFilter

    (Re)start nova-scheduler.

3. DB Configuration.
    copy file /opt/stack/nova/nova/myproject/db/162_add_myproject_hosts.py into /opt/stack/nova/nova/db/sqlalchemy/migrate_repo/versions/ dir
    run the command:
        nova-manage db sync

4. Start nova-myproject.
    run the script /opt/stack/nova/nova/myproject/restart-nova-myproject.sh 

5. Configure Extension API
    Add Following lines into the [DEFAULT] group of nova.conf.
        osapi_compute_extension=nova.myproject.simple_extension.Simple_extension
        osapi_compute_extension=nova.myproject.myproject_extension.Myproject_extension

6. (Re)start nova-api.

7. Modify files /opt/stack/nova/nova/myproject/simple_extension_main.py and /opt/stack/nova/nova/myproject/myproject_extension_main.py.
    change the fields %KEYSTONE_NOVA_PASSWORD%, %KEYSTONE_HOST%, %HOST_NAME% into the actual value.
    where:
        %KEYSTONE_NOVA_PASSWORD% is the password of user nova in keystone service.
        %KEYSTONE_HOST% is the IP of keystone service.
        %HOST_NAME% is the host name of any host running nova-myproject service.

8. Test Extension API
    run the script /opt/stack/nova/nova/myproject/simple_extension_main.py to test simple_extension.
    run the script /opt/stack/nova/nova/myproject/myproject_extension_main.py to test myproject_extension.