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rohityadavcloud merged 2 commits into from
Jun 5, 2020
Merged

kvm: direct download templates for system VM #134

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kvm: direct download templates for system VM
shwstppr Jun 2, 2020
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shwstppr Jun 2, 2020
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22 changes: 20 additions & 2 deletions source/adminguide/templates/_bypass-secondary-storage-kvm.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@
.. _bypass-secondary-storage-kvm:

Bypassing Secondary Storage For KVM templates
--------------------------------------------
---------------------------------------------

CloudStack provides an additional way to register and use templates on KVM.

Expand All @@ -41,6 +41,13 @@ To enable this option for a template:

After the template is registered, it is automatically available for VM deployments.

From CloudStack 4.14.0, system VM templates also support direct download. An administrator can register a new system VM template as ROUTING or USER type with the direct download flag, and it can be changed to SYSTEM type during the upgrade or by out-of-band database changes. Type of newly registered template can be changed to SYSTEM in the database using a SQL query similar to:

.. code:: bash

UPDATE cloud.vm_template SET type=’SYSTEM’ WHERE uuid=’UUID_OF_NEW_TEMPLATE’;


Uploading Certificates for Direct Downloads
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
For direct downloads over HTTPS, the KVM hosts must have valid certificates. These certificates can be either self-signed or signed and will allow the KVM hosts to access the templates/ISOs and download them.
Expand Down Expand Up @@ -78,7 +85,7 @@ CloudStack provides some APIs to handle certificates for direct downloads:
upload templatedirectdownloadcertificate hypervisor=KVM name=CERTIFICATE_ALIAS zoneid=ZONE_ID certificate=CERTIFICATE_FORMATTED hostid=HOST_ID

Syncronising Certificates for Direct Downloads
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

As new hosts may be added to a zone which do not include a certificate which was previously uploaded to pre-existing hosts.

Expand All @@ -88,3 +95,14 @@ CloudStack provides a way to synchronize certificates across all the connected h
- Enumerate the connected hosts in a zone
- Check which hosts are missing the certificates which have been already uploaded to other hosts
- Upload missing certificates to hosts

Direct Download Timeouts
~~~~~~~~~~~~~~~~~~~~~~~~

With 4.14.0, ability to configure different timeout values for the direct downloading of templates has been added. Three new global settings have been added for this:

- **direct.download.connect.timeout** - Connection establishment timeout in milliseconds for direct download. Default value: 5000 milliseconds.

- **direct.download.socket.timeout** - Socket timeout (SO_TIMEOUT) in milliseconds for direct download. Default value: 5000 milliseconds.

- **direct.download.connection.request.timeout** - Requesting a connection from connection manager timeout in milliseconds for direct download. Default value: 5000 milliseconds. This setting is hidden and not visible in UI.