tree 4f0c611345f5d09e7617ec8c30d9085877bd68ea
parent ab3ebbc1b2851611992b53ae32b44b40a29f7b94
author Willy Tarreau <w@1wt.eu> 1565101591 +0200
committer Willy Tarreau <w@1wt.eu> 1565103684 +0200
encoding latin1

BUG/MEDIUM: checks: make sure to close nicely when we're the last to speak

In SMTP, MySQL and PgSQL checks, we're supposed to finish with a message
to politely quit the server, otherwise some of them will log some errors.
This is the case with Postfix as reported in GH issue #187. Since commit
fe4abe6 ("BUG/MEDIUM: connections: Don't call shutdown() if we want to
disable linger.") we are a bit more aggressive on outgoing connection
closure and checks were not prepared for this.

This patch makes the 3 checks above disable the linger_risk for these
checks so that we close cleanly, with the side effect that it will leave
some TIME_WAIT connections behind (hence why it should not be generalized
to all checks). It's worth noting that in issue #187 it's mentioned that
this patch doesn't seem to be sufficient for Postfix, however based only
on local network activity this looks OK, so maybe this will need to be
improved later.

Given that the patch above was backported to 2.0 and 1.9, this one should
as well.

(cherry picked from commit 5488a62bfbcadd33fca1255ca50f953d1f508a61)
Signed-off-by: Willy Tarreau <w@1wt.eu>