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From Nicolas Vazquez <>
Subject Experimental - Direct download for templates
Date Wed, 07 Feb 2018 14:19:55 GMT
Hi all,

A feature has been introduced on 4.11.0 allowing to register templates bypassing secondary
storage using a new option 'Direct Download'. It allows templates to be directly downloaded
into primary storage at VM deployment time. It is an experimental feature and it is currently
supported on KVM hypervisor only. PR:

A brief description on the current implementation:

- CloudStack allows registering Direct Download/Bypass Secondary Storage templates for KVM
hypervisor by setting the direct_download flag to true on registerTemplate.

- Templates are not downloaded to secondary storage after they are registered on CloudStack,
are marked as Bypass Secondary Storage and as Ready for deployment.

- When Bypassed templates are selected for VM deployment, download is delegated to the agents,
which would store the templates on primary storage instead of copying them from secondary

- Metalinks are supported, but aria2 dependency has to be manually installed on the agents.

There are currently some PRs in progress for 4.11.1 with some improvements for this functionality.

Any comments/ideas?




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