[Samba] many smbd processes when sync'ing sysvol

Alex Matthews qoole.samba at lillimoth.com
Wed May 8 06:23:11 MDT 2013

For reference, my smbd.conf is as follows:

# Global parameters
         workgroup = SMC
         realm = internal.stmaryscollege.co.uk
         netbios name = XEN-ARCH-AD-01
         server role = active directory domain controller
         printcap name = /etc/printcap
         load printers = no
         dns forwarder =
#DNS handled by BIND
         server services = -dns

         log level = 1
         max log size = 10240
         log file = /var/log/samba/samba.log.%d
         debug uid = yes
         debug timestamp = yes
         allow dns updates = secure
         nsupdate command = /usr/bin/nsupdate -g
         spn update command = /usr/sbin/samba_spnupdate

         idmap_ldb:use rfc2307 = yes
         winbind nss info = rfc2307

#Small file tuning
         read raw = no
         level2 oplocks = true

On 08/05/2013 10:10, Andrew Bartlett wrote:
> On Tue, 2013-05-07 at 21:55 +0100, Alex Matthews wrote:
>> Hi there,
>> I have three S4 servers running as AD DCs.
>> In order to keep the sysvol share in sync I'm using crontab to run the
>> following command:
>> /usr/bin/rsync -PavAX --delete root@<masterPDC>:/var/lib/samba/sysvol/
>> /var/lib/samba/sysvol/
>> However everytime this command is run a couple of extra smbd processes
>> are started on the <masterPDC> (between 2 and 5 processes) which never
>> exit and just sit there taking up resources. So, quite quickly I had a
>> system with over 500 smbd processes and no free memory which very
>> abruptly fell over and stopped serving genuine clients.
>> Has anyone else come across this issue/know what is causing it?
>> I have taken some level 10 logs of the smbd processes that get formed.
>> However I don't have access to them from my current location. I will
>> email them in tomorrow from work.
> My best guess is that the winbind part of samba's AD DC is making a
> connection, but never closing it.
> Andrew Bartlett

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