fixed a script issue in document 3-compute-resources #791
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It looks like there was a mistake in the document "docs/03-compute-resources.md"
the command was
ssh -n root@${IP} hostnamectl hostname ${HOST}
it should be
ssh -n root@${IP} hostnamectl set-hostname ${HOST}
as set-hostname is the correct flag.
and running with old command will give following error
Unknown operation hostname