Cloudstack SSVM Start condition source code reading and problem solving method _cloudstack

Cloudstack SSVM Start condition source code reading and problem solving method:

When Cloudstack establish Zone, often encounter SSVM does not start, or there is no SSVM situation, analysis Cloudstack log, will find "Zone 1 is not ready to launch secondary VM Yet "print, meaning zone is not ready to start SSVM.

By querying the Cloudstack source code, it is found that the following check before starting SSVM:

Get the template in zone.

Select A.* from Vm_template A, host h where H.type = ' Routing ' and h.data_center_id = 1 and A.type = ' System ' and a . Hypervisor_type = H.hypervisor_type Limit 1;

If it is not obtained, the following warning is printed:

Warn:zone host is ready, but secondary storage VM Template 3 isn't ready on secondary storage:1

Workaround: Check to see if system template has been downloaded (note that you want to download the hypervisor system template for your own environment).

gets the level two storage of the zone.

SELECT * from host where type = ' secondarystorage ' and data_center_id = 1; # Host ID is 3

If it is not obtained, the following warning is printed:

Warn:no secondary storage available in zone 1, wait until it are ready to launch secondary VM

Solution: Establish secondary storage pool for zone 1.

Gets the association of template and host.

SELECT * from template_host_ref where host_id = 3 and template_id = 1 and download_state = ' downloaded '; # host ID and template ID is query by before.

If it is not obtained, the following warning is printed:

Warn:zone host is ready, but secondary storage VM Template 3 isn't ready on secondary storage:1

If the secondary storage is NFS, you can check that the secondary storage work properly by using the mount, and wait for secondary to automatically associate if storage is not a problem.

Gets the host's primary storage.

SELECT p.data_center_id, Count (ph.host_id) count from Storage_pool p, storage_pool_host_ref ph WHERE p.id = Ph.poo l_id and p.data_center_id = 1 GROUP by p.data_center_id;

The number of primary storage needs to be greater than 0, if equal to 0, print the following warning:

warn:primary storage is isn't ready, wait until it are ready to launch secondary VM

When there is no problem, CS will print: Zone 1 is ready to launch secondary storage VM. CS will start the start secondary storage VM work.

Thank you for reading, I hope to help you, thank you for your support for this site!