On Jun 13, 2022, at 08:27, Sharma, Amit via lustre-discuss
<[email protected]<mailto:[email protected]>> wrote:
Hi Team,
can you please help me which ephemeral TCP ports need to be opened for luster
inter server communication.
Regards,
Amit
There are several answers here:
- the LNet socklnd acceptor listens on port 988 for *new* incoming connections
and needs to be open
- socklnd acceptor by default only allows connections *from* ("secure") port
988, unless "accept=all" is used
- after initial TCP connection establishment, *each* new client or server
connection will use 3 TCP sockets
(or more, see LU-12815 for details) on *other* ports, so these cannot be
blocked outright, but do not need
to allow connections
*Most* of the port 988 connections will be client->server, but occasionally if
there is a network problem and the client connection is dropped, then
server->client connections may be initiated to cancel a lock or similar. If
this server->client connection cannot be established, then the client may be
evicted.
Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Whamcloud
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