[GitHub] [cloudstack] bwsw commented on issue #3823: New Feature RFC: KVM domain XML transformer

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bwsw commented on issue #3823: New Feature RFC: KVM domain XML transformer
URL: https://github.com/apache/cloudstack/issues/3823#issuecomment-576581578
 
 
   @PaulAngus thanks for reply, but it's not what I mean. I really cry about this PR - it's huge pain for cloud admins of public cloud... It introduces user-driven VM alternations and very bad for troubleshooting. 
   
   I'm speaking about provider-driven XML alternation based on some kind of dynamic logic when VM is launched. E.g. when VM of SO_X is launched it searches for a spare GPU on host and it's ingested into XML pass-thru, or it cuts , say 32GB of optane device LVM and passes it into VM as a cache device. It's provider driven and user cannot change it.
   
   Real-world example, for every domain/account we have VXLANID in MySQL table. When VM is launched, we create private VM VXLAN network and add it as an unmanaged NIC to VM. CloudStack knows nothing about it. User gets it as is. Now we use hotplug KVM feature for it, but better to change XML and launch VM with such NIC defined.
   

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