Today when I tried to add a new node I noticed linode now has Sydney region, and they offer a tool to migrate region: https://www.linode.com/docs/platform/disk-images/how-to-initiate-a-cross-data-center-migration-for-your-linode/
The process is pretty much painless except IP change, I was expecting linode to update network setting automatically, but that didn't happen :) it's easy to fix up though, log into the node via linode web console, then:
sudo ifconfig eth0 xxx.xxx.xxx.xxx, new IP can be found in linode control panel/etc/resolve.conf to point to new DNSsudo systemctl enable systemd-networkd