[OpenAFS] Re: How to remove a bogus (127.0.1.1) server entry for readonly volume?

[Jeffrey Altman]

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On 12/9/2013 1:47 PM, Harald Barth wrote:
>>> Not in the listaddrs list but will it go away from the volume locatio=
n
>>> list?
>>
>> I don't understand this sentence.
>=20
> Is the 127.0.1.1 deleted or replaced as a replication site location if
> the server registers as 129.89.38.124 when previously known as
> 127.0.1.1.

In OpenAFS volume locations are tracked by file server UUID not by
ip-address.   At startup the file server registers it active address
list with the vldb.  These addresses are the ones that reported to
clients that query the VLDB for the addresses belonging to a particular
server.

The VL_GetEntryByNameU RPC returns the list of volume locations by
server UUID and partition.

The VL_GetAddrsU RPC returns the list of addresses for a specified
server UUID.

>> No, OpenAFS 1.6.5 detects 127/16; that is, 127.0.x.x. See src/rx/rx.h,=

>> rx_IsLoopbackAddr (in this specific case, called from GetServer in
>> src/volser/vos.c). This is a kind of balance (or an argument
>> compromise :) between trying to catch all loopback addresses an
>> administrator is likely to accidentally specify, but allowing a range =
of
>> 127/8 addresses if you actually do want to use loopback for testing or=

>> something.
>=20
> Then something in the server startup should probably check the same ran=
ge.

The file server constructs the address list either by calling
rx_getAllAddr() or afsconf_ParseNetFiles().   Both paths filter the
address list for loopback addresses.

It is of course possible that there is a bug in one of these code paths.
 All interested members of the community are welcome to read the source
code or debug a machine that is actively advertising a loopback address
to the VLDB.

Jeffrey Altman



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