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http_directory (string) - Path to a directory to serve using an HTTP server. The files in this
directory will be available over HTTP that will be requestable from the
virtual machine. This is useful for hosting kickstart files and so on.
By default this is an empty string, which means no HTTP server will be
started. The address and port of the HTTP server will be available as
variables in boot_command. This is covered in more detail below.
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http_port_min (int) - These are the minimum and maximum port to use for the HTTP server
started to serve the http_directory. Because Packer often runs in
parallel, Packer will choose a randomly available port in this range to
run the HTTP server. If you want to force the HTTP server to be on one
port, make this minimum and maximum port the same. By default the values
are 8000 and 9000, respectively.
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http_port_max (int) - HTTP Port Max