[pve-devel] [PATCH qemu-server] api: cloud-init support for mtu and userdata

[Mira Limbeck]

Hi,

On 9/4/20 5:21 PM, proxmox wrote:
> Hello
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> I didn't know this patch mail got approved, so sorry for the (very) late response.
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> My intention for not going with snippets was the fact that they could not be created via the API and one would have to manually create a file on the target machine for cloud-init userdata.

There is currently a bug report open for this: 
https://bugzilla.proxmox.com/show_bug.cgi?id=2208

This together with backup and migration of snippets could be useful.

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> One possible use case was to spin up a kubernetes cluster on proxmox only via API.
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> I wanted to have something similar to the hetzner cloud API where the full userdata can be submitted for VM provisioning:
> https://docs.hetzner.cloud/#servers-create-a-server
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> So going further here you want me to submit the MTU patches separately?
The MTU patches separately would be great.
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> Should I integrate userdata into the cicustom field? I thought this would make things more complex in favor of parsing out the base64 stuff. So I would still go with an extra field.

After some discussions we think that putting the userdata in the config 
file is not the right approach. As the cluster filesystem is limited to 
32M and a single VM config file is limited to 512K you can easily run 
into the limit with a small number of VMs. We would most likely have to 
limit the userdata per config to a very small amount (1K?). But with 
those limits it is difficult to get everything in.

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> Thoughts?
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