example)
# nova list --status SUSPENDED --all-tenant
# nova list --flavor m1.medium --all-tenant
# nova list --image CentOS6_Onlyroot --all-tenant
# nova list --deleted --all-tenant
usage: nova list [--reservation-id <reservation-id>] [--ip <ip-regexp>]
[--ip6 <ip6-regexp>] [--name <name-regexp>]
[--instance-name <name-regexp>] [--status <status>]
[--flavor <flavor>] [--image <image>] [--host <hostname>]
[--all-tenants [<0|1>]] [--tenant [<tenant>]]
[--user [<user>]] [--deleted] [--fields <fields>] [--minimal]
[--sort <key>[:<direction>]]
List active servers.
Optional arguments:
--reservation-id <reservation-id>
Only return servers that match reservation-id.
--ip <ip-regexp> Search with regular expression match by IP address.
--ip6 <ip6-regexp> Search with regular expression match by IPv6 address.
--name <name-regexp> Search with regular expression match by name
--instance-name <name-regexp>
Search with regular expression match by server name.
--status <status> Search by server status
--flavor <flavor> Search by flavor name or ID
--image <image> Search by image name or ID
--host <hostname> Search servers by hostname to which they are assigned (Admin only).
--all-tenants [<0|1>] Display information from all tenants (Admin only).
--tenant [<tenant>] Display information from single tenant (Admin only). The --all-tenants option must also be provided.
--user [<user>] Display information from single user (Admin only).
--deleted Only display deleted servers (Admin only).
--fields <fields> Comma-separated list of fields to display. Use the show command to see which fields are available.
--minimal Get only uuid and name.
--sort <key>[:<direction>] Comma-separated list of sort keys and directions in the form of <key>[:<asc|desc>].
The direction defaults to descending if not specified.
