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Nova uses a configuration file containing flags located in /etc/nova/nova.conf. You can get the most recent listing of avaialble flags by running nova-(servicename) --help, for example, nova-api --help.
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Here's a list of available flags and their default settings.
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--ajax_console_proxy_port: port that ajax_console_proxy binds
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--ajax_console_proxy_topic: the topic ajax proxy nodes listen on
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(default: 'ajax_proxy')
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--ajax_console_proxy_url: location of ajax console proxy, in the form
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"http://127.0.0.1:8000"
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(default: 'http://127.0.0.1:8000')
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--auth_token_ttl: Seconds for auth tokens to linger
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--aws_access_key_id: AWS Access ID
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--aws_secret_access_key: AWS Access Key
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--compute_manager: Manager for compute
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(default: 'nova.compute.manager.ComputeManager')
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--compute_topic: the topic compute nodes listen on
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--connection_type: libvirt, xenapi or fake
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--console_manager: Manager for console proxy
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(default: 'nova.console.manager.ConsoleProxyManager')
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--console_topic: the topic console proxy nodes listen on
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--control_exchange: the main exchange to connect to
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--db_backend: The backend to use for db
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(default: 'sqlalchemy')
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--default_image: default image to use, testing only
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(default: 'ami-11111')
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--default_instance_type: default instance type to use, testing only
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--default_log_levels: list of logger=LEVEL pairs
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(default: 'amqplib=WARN,sqlalchemy=WARN,eventlet.wsgi.server=WARN')
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(a comma separated list)
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--default_project: default project for openstack
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(default: 'openstack')
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--ec2_dmz_host: internal ip of api server
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--ec2_host: ip of api server
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--ec2_path: suffix for ec2
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(default: '/services/Cloud')
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--ec2_port: cloud controller port
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--ec2_scheme: prefix for ec2
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--[no]enable_new_services: Services to be added to the available pool on
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--[no]fake_network: should we use fake network devices and addresses
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--[no]fake_rabbit: use a fake rabbit
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--glance_host: glance host
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--glance_port: glance port
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-?,--[no]help: show this help
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--[no]helpshort: show usage only for this module
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--[no]helpxml: like --help, but generates XML output
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--host: name of this node
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--image_service: The service to use for retrieving and searching for images.
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(default: 'nova.image.s3.S3ImageService')
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--instance_name_template: Template string to be used to generate instance
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(default: 'instance-%08x')
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--logfile: output to named file
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--logging_context_format_string: format string to use for log messages with
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(default: '%(asctime)s %(levelname)s %(name)s [%(request_id)s %(user)s
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%(project)s] %(message)s')
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--logging_debug_format_suffix: data to append to log format when level is
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(default: 'from %(processName)s (pid=%(process)d) %(funcName)s
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%(pathname)s:%(lineno)d')
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--logging_default_format_string: format string to use for log messages without
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(default: '%(asctime)s %(levelname)s %(name)s [-] %(message)s')
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--logging_exception_prefix: prefix each line of exception output with this
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(default: '(%(name)s): TRACE: ')
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--my_ip: host ip address
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(default: '184.106.73.68')
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--network_manager: Manager for network
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(default: 'nova.network.manager.VlanManager')
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--network_topic: the topic network nodes listen on
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--node_availability_zone: availability zone of this node
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--null_kernel: kernel image that indicates not to use a kernel, but to use a
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raw disk image instead
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(default: 'nokernel')
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--osapi_host: ip of api server
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--osapi_path: suffix for openstack
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--osapi_port: OpenStack API port
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--osapi_scheme: prefix for openstack
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--periodic_interval: seconds between running periodic tasks
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--pidfile: pidfile to use for this service
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--rabbit_host: rabbit host
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(default: 'localhost')
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--rabbit_max_retries: rabbit connection attempts
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--rabbit_password: rabbit password
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--rabbit_port: rabbit port
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--rabbit_retry_interval: rabbit connection retry interval
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--rabbit_userid: rabbit userid
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--rabbit_virtual_host: rabbit virtual host
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--region_list: list of region=fqdn pairs separated by commas
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(a comma separated list)
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--report_interval: seconds between nodes reporting state to datastore
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--s3_dmz: s3 dmz ip (for instances)
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--s3_host: s3 host (for infrastructure)
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--scheduler_manager: Manager for scheduler
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(default: 'nova.scheduler.manager.SchedulerManager')
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--scheduler_topic: the topic scheduler nodes listen on
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(default: 'scheduler')
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--sql_connection: connection string for sql database
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(default: 'sqlite:///$state_path/nova.sqlite')
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--sql_idle_timeout: timeout for idle sql database connections
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--sql_max_retries: sql connection attempts
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--sql_retry_interval: sql connection retry interval
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--state_path: Top-level directory for maintaining nova's state
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(default: '/usr/lib/pymodules/python2.6/nova/../')
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--[no]use_syslog: output to syslog
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--[no]verbose: show debug output
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--volume_manager: Manager for volume
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(default: 'nova.volume.manager.VolumeManager')
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--volume_name_template: Template string to be used to generate instance names
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(default: 'volume-%08x')
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--volume_topic: the topic volume nodes listen on
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--vpn_image_id: AMI for cloudpipe vpn server
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(default: 'ami-cloudpipe')
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--vpn_key_suffix: Suffix to add to project name for vpn key and secgroups
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The OpenStack wiki has a page with the flags listed by their purpose and use at http://wiki.openstack.org/FlagsGrouping.
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