The Compute service supports a large number of configuration options. These options are specified in a configuration file whose default location in /etc/nova/nova.conf. The configuration file is in INI file format, with options specified as key=value pairs, grouped into sections. Almost all of the configuration options are in the DEFAULT section. Here's a brief example:[DEFAULT] debug=true verbose=true [trusted_computing] server=10.3.4.2 Each configuration option has an associated type that indicates what values can be set. The supported option types are as follows: BoolOpt Boolean option. Value must be either true or false . Example:debug=false StrOpt String option. Value is an arbitrary string. Example:my_ip=10.0.0.1 IntOption Integer option. Value must be an integer. Example: glance_port=9292 MultiStrOpt String option. Same as StrOpt, except that it can be declared multiple times to indicate multiple values. Example:ldap_dns_servers=dns1.example.org ldap_dns_servers=dns2.example.org ListOpt List option. Value is a list of arbitrary strings separated by commas. Example:enabled_apis=ec2,osapi_compute,metadata FloatOpt Floating-point option. Value must be a floating-point number. Example:ram_allocation_ratio=1.5 Nova options should not be quoted. Configuration options are grouped by section. The Compute config file supports the following sections. [DEFAULT] Almost all of the configuration options are organized into this section. If the documentation for a configuration option does not specify its section, assume that it should be placed in this one. [cells] The cells section is used for options for configuring cells functionality. See the Cells section of the OpenStack Compute Admin Manual for more details. [baremetal] This section is used for options that relate to the baremetal hypervisor driver. [conductor] The conductor section is used for options for configuring the nova-conductor service. [trusted_computing] The trusted_computing section is used for options that relate to the trusted computing pools functionality. Options in this section describe how to connect to a remote attestation service. The configuration file supports variable substitution. Once a configuration option is set, it can be referenced in later configuration values when preceded by $. Consider the following example where my_ip is defined and then $my_ip is used as a variable.my_ip=10.2.3.4 glance_host=$my_ip metadata_host=$my_ip If you need a value to contain the $ symbol, escape it by doing $$. For example, if your LDAP DNS password was $xkj432, you would do:ldap_dns_password=$$xkj432 The Compute code uses Python's string.Template.safe_substitute() method to implement variable substitution. For more details on how variable substitution is resolved, see Python documentation on template strings and PEP 292. To include whitespace in a configuration value, use a quoted string. For example:ldap_dns_passsword='a password with spaces' The configuration file is loaded by all of the nova-* services, as well as the nova-manage command-line tool. To specify an alternate location for the configuration file, pass the --config-file /path/to/nova.conf argument when starting a nova-* service or calling nova-manage.