[Kimchi-devel] [RFC] UI - Live migration UI design

[Walter Niklaus]

On 13.11.2015 14:09, Daniel Henrique Barboza wrote:
> Hi,
>
> The backend for this feature is almost completed and the API is 
> defined, so let's
> talk about the UI.
>
> This is the API (note: the upstream version is outdated, will be 
> updated in an
> incoming patch):
>
> **URI:** /plugins/kimchi/vms/*:name*
>
> * **POST**: *See Virtual Machine Actions*
>
> **Actions (POST):**
>
> * migrate: Migrate a virtual machine to a remote server, only support 
> live
> mode without block migration.
>     * remote_host: IP address or hostname of the remote server.
>     * user *(optional)*: User to log on at the remote server.
>     * password *(optional)*: password of the user in the remote server
>
>
> This API will return a task ID for the UI to track its progress, 
> pretty much
> like it is done with the 'clone' feature.
>
> This is how I imagine the UI:
>
> - a button called "migrate" at the same submenu as clone VM.
>
> - when pressed, a new window appears with the following content:
>
> --------
> "Disclaimer: this process cannot be stopped after started, can take a 
> long time
> to complete and will turn off this current VM when it is over."
I would propose to change the wording: will turn off this current VM 
when it is over.   into something like:    will turn off the VM on this 
Hypervisor when it is sucessfully migrated to the remote destination.
Sorry, but I don't remember if we allow static migration as well ? If we 
do, then we may have to display a different text for the static migration.
>
> * textfield to input the remote_server, name "remote server"
>
> * checkbox with text: "Delete this VM when the migration is completed"
>
Typically the VM definition, and I guess this is what the checkbox is 
reffering to, is migrated to the remote host as well in order to allow 
full management of this VM on the remote host (like changing its 
configuration). I'm aware that we are not doing such actions in this 
first release. However migrating the VM definition has a sideeffect we 
may want to consider in this scope:  it makes sure that you can not have 
multiple instances of the VM running on different hosts. This aspect is 
releveant only if starting the VM multiple times is causing a conflict 
on a resource like: the same SCSI disk as boot device.
I'm wondering that if the user doesn't select the above checkbox we 
should put out a warning like:  "Restarting the VM locally may cause 
resource conflicts with the migrated instance"
>
> Text: "The following fields are optional. Fill them if you want Kimchi to
> setup a password-less ssh session between the localhost and the
> remote host. The setup process will only be successful if the user
> has 'SUDO ALL' permission in the remote machine"
>
> * textfield to input the username of the remote host
> * password field to input the password of the user in the remote host
>
> * "Cancel" and "Start" buttons at the bottom
>
> -------------
>
>
> This is the workflow/behavior I would expect of it:
>
> - clicking "Cancel" at any time will dismiss the window and nothing 
> happens;
>
> - clicking "Start" without remote_host field will issue an error 
> "remote host field
> cannot be blank" or something like that
>
> - clicking "Start" with a remote host field will start the process
>
> - clicking "Start" with remote host and only one of the user or 
> password filled
> will raise an error "both user and password fields must be filled".
>
> - if, **and only if **,  the user checks the checkbox "Delete VM 
> ....", the UI will
> delete the VM after the migration process is completed by using the 
> proper API
> (I believe it is DELETE /vms/name).
>
>
> This is all I have for the UI for this feature ATM. I'll update this 
> RFC if required.
>
>
> Please provide comments and suggestions. The final backend for this 
> feature
> will be submitted to the ML at the start of the next week.
>
>
> Let me know if there's any doubts about how Kimchi's live migration 
> backend
> works.
>
>
>
> Daniel
>
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