docs: Update preferred NBD device syntax
Mention the preferred URI form, especially since NBD is trying to standardize that form: https://lists.debian.org/nbd/2019/06/msg00012.html Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20190903145634.20237-1-eblake@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com>
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@ -297,9 +297,16 @@ qemu-system-i386 -drive file=iscsi://192.0.2.1/iqn.2001-04.com.example/1
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@item NBD
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QEMU supports NBD (Network Block Devices) both using TCP protocol as well
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as Unix Domain Sockets.
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as Unix Domain Sockets. With TCP, the default port is 10809.
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Syntax for specifying a NBD device using TCP
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Syntax for specifying a NBD device using TCP, in preferred URI form:
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``nbd://<server-ip>[:<port>]/[<export>]''
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Syntax for specifying a NBD device using Unix Domain Sockets; remember
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that '?' is a shell glob character and may need quoting:
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``nbd+unix:///[<export>]?socket=<domain-socket>''
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Older syntax that is also recognized:
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``nbd:<server-ip>:<port>[:exportname=<export>]''
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Syntax for specifying a NBD device using Unix Domain Sockets
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