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List:       sssd-users
Subject:    Re: [SSSD-users] sssd cache detection ?
From:       Jakub Hrozek <jhrozek () redhat ! com>
Date:       2015-01-30 10:26:52
Message-ID: 20150130102652.GC3114 () hendrix ! brq ! redhat ! com
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On Fri, Jan 30, 2015 at 10:03:02AM +0100, Lukas Slebodnik wrote:
> On (30/01/15 07:33), Ash Nand wrote:
> >Hi there.
> >
> >Does sssd export any library/function which would allow one to test if the
> >dataset *was* coming from a cache and NOT the real source (assuming source
> >outage)?
> >
> >I have a LDAP backend provider here with a generous cache timeout. I was
> >wondering if it would be possible to tap somewhere , to achieve something
> >equivalent to `getent -s sss passwd xxx` but only if/when user xxx was
> >cached by sssd and in offline mode.
> >
> >In other words detect when sssd is in offline mode, the sssd cache is
> >transparently servicing clients without resorting to parsing log files.
> >
> We do not have a command line utility to find out this state.
> There is ticket in trac to impement it.
> 
> You can use netstat utility for such purpose as a workaround.
> For demonstaration putposes I send signals to main sssd process to go offline
> and then online. And you need to run netstat as a root otherwise you will not
> see PID and name of sssd process (netstat -p)
> 
> [root@host ~]# netstat -tpn | grep sssd_be
> tcp        0      0 10.34.129.86:56053      10.16.78.114:389        ESTABLISHED 7265/sssd_be
> 
> [root@host ~]# kill -USR1 `pgrep sssd$`
> [root@host ~]# netstat -tpn | grep sssd_be
> 
> [root@host ~]# kill -USR2 `pgrep sssd$`
> [root@host ~]# netstat -tpn | grep sssd_be
> 
> tcp        0      1 10.34.129.86:56055      10.16.78.114:389        SYN_SENT    7265/sssd_be
> [root@host ~]# netstat -tpn | grep sssd_be
> tcp        0      0 10.34.129.86:56055      10.16.78.114:389        ESTABLISHED 7265/sssd_be
> 
> HTH
> 
> LS

You can also check the user's timestamps in the database using the
ldbsearch tool, expire him with sss_cache tool, lookup the user and then
check the timestamp was updated to current time.
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