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https://issues.apache.org/jira/browse/CLOUDSTACK-8041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14236780#comment-14236780
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Rohit Yadav commented on CLOUDSTACK-8041:
-----------------------------------------

Went through the logs and upgrade class, we simply need to document the upgrade 
process when upgrading to 4.5.0 similar to:
http://docs.cloudstack.apache.org/projects/cloudstack-release-notes/en/stable/upgrade/upgrade-4.4.0.html#update-system-vm-templates

Another solution is: cc [~dahn]
In the Upgrade442to450 class's updateSystemVmTemplates, instead of updating 
systevms with new url/checksum in the end when a systemvm is not found for a 
hypervisor in use; we can start by updating vm_template table with the new 
templates only if a new template is not found and then continue with the 
upgrade logic. This way we are sort of registering the template in case a 
sysadmin forgot to register a template.

> 4.5.0 db upgrade fail if new systemvm templates are abscent 
> ------------------------------------------------------------
>
>                 Key: CLOUDSTACK-8041
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8041
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the 
> default.) 
>          Components: Management Server
>    Affects Versions: 4.5.0
>            Reporter: Pierre-Luc Dion
>            Priority: Blocker
>             Fix For: 4.5.0, 4.6.0
>
>
> When upgrading ACS to 4.5.0 without systemvm-{hypervisor}-4.5 already in 
> place, the db upgrade fail.
> Upgrading ACS without systemvm should not affect db upgrade.



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