On Tue, Feb 23, 2016 at 08:11:58AM +0100, Harald Dunkel wrote:
> On 02/22/2016 03:51 PM, Jakub Hrozek wrote:
> > 
> > Is there anything else in the logs (/var/log/sssd/*)
> > 
> 
> Only some events after sssd went away:
> 
> srvvm01:/var/log/sssd# cat sssd.log.1
> (Sun Feb 21 18:02:21 2016) [sssd] [monitor_restart_service] (0x0010): Process 
> [nss], definitely stopped!
> 
> srvvm01:/var/log/sssd# cat sssd_nss.log.1
> (Sun Feb 21 18:02:15 2016) [sssd[nss]] [sss_dp_init] (0x0010): Failed to 
> connect to monitor services.
> (Sun Feb 21 18:02:15 2016) [sssd[nss]] [sss_process_init] (0x0010): fatal 
> error setting up backend connector
> (Sun Feb 21 18:02:15 2016) [sssd[nss]] [nss_process_init] (0x0010): 
> sss_process_init() failed
> (Sun Feb 21 18:02:17 2016) [sssd[nss]] [sss_dp_init] (0x0010): Failed to 
> connect to monitor services.
> (Sun Feb 21 18:02:17 2016) [sssd[nss]] [sss_process_init] (0x0010): fatal 
> error setting up backend connector
> (Sun Feb 21 18:02:17 2016) [sssd[nss]] [nss_process_init] (0x0010): 
> sss_process_init() failed
> (Sun Feb 21 18:02:21 2016) [sssd[nss]] [sss_dp_init] (0x0010): Failed to 
> connect to monitor services.
> (Sun Feb 21 18:02:21 2016) [sssd[nss]] [sss_process_init] (0x0010): fatal 
> error setting up backend connector
> (Sun Feb 21 18:02:21 2016) [sssd[nss]] [nss_process_init] (0x0010): 
> sss_process_init() failed

Then unfortunately I can only suggest to set a more verbose debug_level
(maybe coupled with a logrotate settings to avoid flooding your disk
with logs) and monitor sssd.

Typically, this happens when the machine SSSD is running on is very
busy, the sssd_be process is blocked writing some large result from
LDAP, the monitor process considers it stuck and kills it. However, we
/should/ restart and reconnect the subprocesses.

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