[lustre-discuss] need info regarding TCP ports for lustre

[Andreas Dilger]

On Jun 13, 2022, at 08:27, Sharma, Amit via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>> 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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