Database Table: csv2_group_metadata

In order for a Virtual Machine (VM) running on a cloud to be useful in the distributed cloud computing environment, it must be “contextualized”. At a minumum, it must register with a condor central manager to receive jobs to execute. This contextualization is achieved through metadata which is passed to cloud-init (see https://cloudinit.readthedocs.io/en/latest/). The metadata to be used is saved as files within the database. Metadata can be defined at the group level (applies to all clouds within the group) or specific to each cloud. All enabled metadata, both group and cloud level metadata, is collated in priority order and passed to cloud-init.

This table maintains group level metadata applicable to all clouds within the group.

Keys:

• group_name (String(32)):

  Is the name of the group owning the metadata file.

• metadata_name (String(64)):

  Is the arbitrary unique name, within the group’s metadata files, of this metadata file.

Columns:

• enabled (Boolean):

  If set to 0, the metadata file is disabled and will not be used. If set to 1, the metadata file is enabled and will be passed to cloud-init in priority order.

• priority (Integer):

  An integer (including negative integers) indicating the metadata file priority. Lower numbers have highter priority and will be included earlier in the collation order.

• metadata (String):

  Is the metadata. It’s format is dependent on the application that consumes it (see “mime_type” below).

• mime_type (String(128)):

  Is a valid mime type determining the way in which CSV2 handles this file. Examples of mime_type are:

  o cloud-config - yaml files passed to cloud-init.

  o ucernvm-config - a CernVM parameter file (see CernVM documentation).

  For a complete list refer to the content of the CSV2 table csv2_mime_types.