Synnefo » snf-ganeti » ganeti-local

interface is composed by a series of scripts which get called with certain

parameters to perform OS-dependent operations on the cluster. The current

scripts are:

create

  called when a new instance is added to the cluster

export

As in Ganeti 1.2, every OS which wants to be installed in Ganeti needs to

support the following functionality, through scripts:

create:

  used to create a new instance running that OS. This script should prepare the

  block devices, and install them so that the new OS can boot under the

We expect the following incompatibilities between the OS scripts for 1.2 and

the ones for 2.0:

- Input parameters: in 1.2 those were passed on the command line, in 2.0 we'll

  use environment variables, as there will be a lot more information and not

  all OSes may care about all of it.

Rather than using command line flags, as they do now, scripts will accept

inputs from environment variables.  We expect the following input values:

INSTANCE_NAME

  Name of the instance acted on

HYPERVISOR

Some scripts will need a few more information to work. These will have

per-script variables, such as for example:

NEW_INSTANCE_NAME

  rename: the name the instance should be renamed to.

EXPORT_NODE

Output/Behaviour

As discussed scripts should only send user-targeted information to stdout. The

create and import scripts are supposed to format/initialise the given block

Caveats/Notes

We might want to have a "default" import/export behaviour that just dumps all

disks and restores them. This can save work as most systems will just do this,

the case we may want to go to a more complex API such as storing those

information on the filesystem and providing the OS script with the path to a

file where they are encoded in some format.