[Samba] smbd process don't auto close

[Ryan]

The pic seems missing. Here's the info:
PID     Username     Group        Machine                                   Protocol Version  Encryption           Signing
----------------------------------------------------------------------------------------------------------------------------------------
112451  3000243      3000019      8.22.32.200 (ipv4:8.22.32.200:51106)      SMB2_10           -                    HMAC-SHA256
122045  3000245      3000019      8.22.32.187 (ipv4:8.22.32.187:51657)      SMB2_10           -                    HMAC-SHA256
122751  3000245      3000019      8.22.32.187 (ipv4:8.22.32.187:52258)      SMB2_10           -                    HMAC-SHA256
112844  3000243      3000019      8.22.32.200 (ipv4:8.22.32.200:51549)      SMB2_10           -                    HMAC-SHA256
28794   3000242      3000019      8.22.32.190 (ipv4:8.22.32.190:54824)      SMB2_10           -                    HMAC-SHA256
 
Service      pid     Machine       Connected at                     Encryption   Signing
---------------------------------------------------------------------------------------------
IPC$         112844  8.22.32.200   Thu Sep 27 02:52:11 PM 2018 CST  -            HMAC-SHA256
IPC$         28794   8.22.32.190   Thu Sep 27 03:06:30 PM 2018 CST  -            HMAC-SHA256
IPC$         122045  8.22.32.187   Thu Sep 27 02:54:42 PM 2018 CST  -            HMAC-SHA256
IPC$         112451  8.22.32.200   Thu Sep 27 02:52:03 PM 2018 CST  -            HMAC-SHA256
IPC$         122751  8.22.32.187   Thu Sep 27 02:54:50 PM 2018 CST  -            HMAC-SHA256
 
No locked files
 
C9C09AF2_HDC1:/var/lib/dhcp/db # ping 8.22.32.200
PING 8.22.32.200 (8.22.32.200) 56(84) bytes of data.
^C
--- 8.22.32.200 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 1999ms
 
C9C09AF2_HDC1:/var/lib/dhcp/db # ps -ef|grep smbd
root      50238  50225  0 Sep26 ?        00:00:04 /usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
root      51078  50238  0 Sep26 ?        00:00:00 /usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
root      51079  50238  0 Sep26 ?        00:00:00 /usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
root      76594  18795  0 15:20 pts/1    00:00:00 grep smbd
root     112451  50238  0 14:51 ?        00:00:00 /usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
root     112844  50238  0 14:52 ?        00:00:00 /usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
root     122045  50238  0 14:54 ?        00:00:00 /usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
root     122751  50238  0 14:54 ?        00:00:00 /usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
>
>Recently I find the smbd process does not close itself even it is invalid, or it close too slow. As the screenshot shows, the connection 112451 and 112844 were created because of the client 8.22.32.200 at Sep 27 02:52:11. And it still exist now at 15:30. But clearly 8.22.32.200 is not available any more. This VM was disabled by me early. The samba version is 4.5.16.
> 
>Does the smbd process not auto quit? If so, when I have many connections, my server can’t afford definitely. I find an answer to set auto close connection in http://www.spectrumscale.org/pipermail/gpfsug-discuss/2017-October/003975.html, the parameter:
>deadtime=10
>and TCP level:
>TCP_NODELAY SO_KEEPALIVE TCP_KEEPCNT=4 TCP_KEEPIDLE=240 TCP_KEEPINTVL=15
>But I didn’t find any description about these parameters. So I want to ask which is the right way to prevent this issue? And what is the effect?
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