# Manage Flavors¶

Admin users can use the openstack flavor command to customize and manage flavors. To see information for this command, run:

$openstack flavor --help Command "flavor" matches: flavor create flavor delete flavor list flavor set flavor show flavor unset  Note Configuration rights can be delegated to additional users by redefining the access controls for os_compute_api:os-flavor-manage in /etc/nova/policy.json on the nova-api server. Note Flavor customization can be limited by the hypervisor in use. For example the libvirt driver enables quotas on CPUs available to a VM, disk tuning, bandwidth I/O, watchdog behavior, random number generator device control, and instance VIF traffic control. For information on the flavors and flavor extra specs, refer to Flavors. ## Create a flavor¶ 1. List flavors to show the ID and name, the amount of memory, the amount of disk space for the root partition and for the ephemeral partition, the swap, and the number of virtual CPUs for each flavor: $ openstack flavor list

2. To create a flavor, specify a name, ID, RAM size, disk size, and the number of vCPUs for the flavor, as follows:

$openstack flavor create FLAVOR_NAME --id FLAVOR_ID \ --ram RAM_IN_MB --disk ROOT_DISK_IN_GB --vcpus NUMBER_OF_VCPUS  Note Unique ID (integer or UUID) for the new flavor. If specifying ‘auto’, a UUID will be automatically generated. Here is an example that creates a public m1.extra_tiny flavor that automatically gets an ID assigned, with 256 MB memory, no disk space, and one VCPU. $ openstack flavor create --public m1.extra_tiny --id auto \
--ram 256 --disk 0 --vcpus 1

3. If an individual user or group of users needs a custom flavor that you do not want other projects to have access to, you can create a private flavor.

$openstack flavor create --private m1.extra_tiny --id auto \ --ram 256 --disk 0 --vcpus 1  After you create a flavor, assign it to a project by specifying the flavor name or ID and the project ID: $ openstack flavor set --project PROJECT_ID m1.extra_tiny


For a list of optional parameters, run this command:

$openstack help flavor create  4. In addition, you can set or unset properties, commonly referred to as “extra specs”, for the existing flavor. The extra_specs metadata keys can influence the instance directly when it is launched. If a flavor sets the quota:vif_outbound_peak=65536 extra spec, the instance’s outbound peak bandwidth I/O should be less than or equal to 512 Mbps. There are several aspects that can work for an instance including CPU limits, Disk tuning, Bandwidth I/O, Watchdog behavior, and Random-number generator. For information about available metadata keys, see Flavors. For a list of optional parameters, run this command: $ openstack flavor set --help


## Modify a flavor¶

Only the description of flavors can be modified (starting from microversion 2.55). To modify the description of a flavor, specify the flavor name or ID and a new description as follows:



## Default Flavors¶

Previous versions of nova typically deployed with default flavors. This was removed from Newton. The following table lists the default flavors for Mitaka and earlier.

Flavor VCPUs Disk (in GB) RAM (in MB)
m1.tiny 1 1 512
m1.small 1 20 2048
m1.medium 2 40 4096
m1.large 4 80 8192
m1.xlarge 8 160 16384