gnt-os -- Instance operating system administration


gnt-os {command} [arguments...]


The gnt-os is used for managing the list of available operating system flavours for the instances in the Ganeti cluster.



Gives the list of available/supported OS to use in the instances. When creating the instance you can give the OS-name as an option.

Note that hidden or blacklisted OSes are not displayed by this command, use diagnose for showing those.


This command will help you see why an installed OS is not available in the cluster. The list command shows only the OS-es that the cluster sees available on all nodes. It could be that some OS is missing from a node, or is only partially installed, and this command will show the details of all the OSes and the reasons they are or are not valid.


This command will list detailed information about each OS available in the cluster, including its validity status, the supported API versions, the supported parameters (if any) and their documentations, etc.

modify [-H HYPERVISOR [: option=value... ]] {OS}

This command will allow you to modify OS parameters.

To modify the per-OS hypervisor parameters (which override the global hypervisor parameters), you can run modify -H with the same syntax as in gnt-cluster init to override default hypervisor parameters of the cluster for specified OS argument.

To modify the hidden and blacklisted states of an OS, pass the options --hidden yes|no, or respectively --blacklisted .... The 'hidden' state means that an OS won't be listed by default in the OS list, but is available for installation. The 'blacklisted' state means that the OS is not listed and is also not allowed for new instance creations (but can be used for reinstalling old instances).

Note: The OS doesn't have to exists. This allows preseeding the settings for OSes not yet known to gnt-os.


Report bugs to or contact the developers using the Ganeti mailing list <>.


Ganeti overview and specifications: ganeti(7) (general overview), ganeti-os-interface(7) (guest OS definitions).

Ganeti commands: gnt-cluster(8) (cluster-wide commands), gnt-job(8) (job-related commands), gnt-node(8) (node-related commands), gnt-instance(8) (instance commands), gnt-os(8) (guest OS commands), gnt-backup(8) (instance import/export commands), gnt-debug(8) (debug commands).

Ganeti daemons: ganeti-watcher(8) (automatic instance restarter), ganeti-cleaner(8) (job queue cleaner), ganeti-noded(8) (node daemon), ganeti-masterd(8) (master daemon), ganeti-rapi(8) (remote API daemon).


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