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remote migration uses a websocket connection to a task worker running on the target node instead of commands via SSH to control the migration. this websocket tunnel is started earlier than the SSH tunnel, and allows adding UNIX-socket forwarding over additional websocket connections on-demand. the main differences to regular intra-cluster migration are: - source VM config and disks are only removed upon request via --delete - shared storages are treated like local storages, since we can't assume they are shared across clusters (with potentical to extend this by marking storages as shared) - NBD migrated disks are explicitly pre-allocated on the target node via tunnel command before starting the target VM instance - in addition to storages, network bridges and the VMID itself is transformed via a user defined mapping - all commands and migration data streams are sent via a WS tunnel proxy - pending changes and snapshots are discarded on the target side (for the time being) Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com> |
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