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Re: slapd's sockets in CLOSE_WAIT
On Fri, 21 Jan 2000, Kurt D. Zeilenga wrote:
> At 11:15 AM 1/21/00 +0100, Giuseppe Lobiondo wrote:
> >I noticed that each user process opens a socket to the server and the
> >LDAP server has a lot of open sockets in CLOSE_WAIT state.
>
> The server is awaiting the TCP fin from the client...
> What's the state of the other side of the TCP stream?
..
for an "normal" connection I have:
zsh 14412 lobiondo 3u inet 2447675 TCP host.mi.infn.it:4126->host.mi.infn.it:ldap (ESTABLISHED)
newmail 14436 lobiondo 3u inet 2447675 TCP host.mi.infn.it:4126->host.mi.infn.it:ldap (ESTABLISHED)
slapd 29584 root 32u inet 2447676 TCP host.mi.infn.it:ldap->host.mi.infn.it:4126 (ESTABLISHED)
slapd 29586 root 32u inet 2447676 TCP host.mi.infn.it:ldap->host.mi.infn.it:4126 (ESTABLISHED)
slapd 29587 root 32u inet 2447676 TCP host.mi.infn.it:ldap->host.mi.infn.it:4126 (ESTABLISHED)
Connected on both sides.
For the connections in CLOSE_WAIT:
zsh 26305 abaldini 3u inet 2131575 TCP host.mi.infn.it:2356->host.mi.infn.it:ldap (CLOSE_WAIT)
newmail 26330 abaldini 3u inet 2131575 TCP host.mi.infn.it:2356->host.mi.infn.it:ldap (CLOSE_WAIT)
xbiff 26335 abaldini 3u inet 2131575 TCP host.mi.infn.it:2356->host.mi.infn.it:ldap (CLOSE_WAIT)
and no corrispondent on slapd's port.
the zsh process is awaiting for terminal input at this point. I don't
know why a fin was not sent to the server socket, can it depend on
nss_ldap?
----zsh
#strace -p 26305
about to attach 66c1
read(10, ...
# lsof -p 26305
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
zsh 26305 abaldini cwd DIR 8,48 1024 159745 /users/abaldini
zsh 26305 abaldini rtd DIR 8,10 1024 2 /
zsh 26305 abaldini txt REG 8,10 340548 20175 /bin/zsh
zsh 26305 abaldini mem REG 8,10 342206 24098 /lib/ld-2.1.1.so
zsh 26305 abaldini mem REG 8,6 44 331778 /usr/share/locale/en_US/LC_MESSAGES/SYS_LC_MESSAGES
zsh 26305 abaldini mem REG 8,6 93 329732 /usr/share/locale/en_US/LC_MONETARY
zsh 26305 abaldini mem REG 8,10 15129 24157 /lib/libtermcap.so.2.0.8
zsh 26305 abaldini mem REG 8,10 364235 24118 /lib/libnsl-2.1.1.so
zsh 26305 abaldini mem REG 8,10 4016683 24105 /lib/libc-2.1.1.so
zsh 26305 abaldini mem REG 8,10 243964 24136 /lib/libnss_files-2.1.1.so
zsh 26305 abaldini mem REG 8,10 342458 24190 /lib/libnss_ldap-2.1.1.so
zsh 26305 abaldini mem REG 8,10 235419 24144 /lib/libpthread-0.8.so
zsh 26305 abaldini mem REG 8,10 164797 24146 /lib/libresolv-2.1.1.so
zsh 26305 abaldini mem REG 8,6 29970 329730 /usr/share/locale/en_US/LC_COLLATE
zsh 26305 abaldini mem REG 8,6 508 329734 /usr/share/locale/en_US/LC_TIME
zsh 26305 abaldini mem REG 8,6 27 329733 /usr/share/locale/en_US/LC_NUMERIC
zsh 26305 abaldini mem REG 8,6 10428 329731 /usr/share/locale/en_US/LC_CTYPE
zsh 26305 abaldini 0u CHR 136,2 4 /dev/pts/2
zsh 26305 abaldini 1u CHR 136,2 4 /dev/pts/2
zsh 26305 abaldini 2u CHR 136,2 4 /dev/pts/2
zsh 26305 abaldini 3u inet 2131575 TCP host.mi.infn.it:2356->host.mi.infn.it:ldap (CLOSE_WAIT)
zsh 26305 abaldini 10u CHR 136,2 4 /dev/pts/2
> >I'm not sure but I think this is for the clients to reuse the same socket
> >later instead of creating a new one. (in slapd's daemon.c I've found
> >that the server sets the flag SO_REUSEADDR on sockets)
>
> Yes, but it doesn't relate to your problem. See setsockopt(3).
>
> >But since the open sockets are local it is possible for local processes
> >use Unix Domain sockets? (if yes how?)
>
> Not in OpenLDAP 1.x.
>
Are you going to introduce this on v 2.X?
Thanks a lot, Giuseppe Lo Biondo