[SSSD-users] sssd cache detection ?

Lukas Slebodnik lslebodn at redhat.com
Fri Jan 30 09:03:02 UTC 2015


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 at host ~]# netstat -tpn | grep sssd_be
tcp        0      0 10.34.129.86:56053      10.16.78.114:389        ESTABLISHED 7265/sssd_be

[root at host ~]# kill -USR1 `pgrep sssd$`
[root at host ~]# netstat -tpn | grep sssd_be

[root at host ~]# kill -USR2 `pgrep sssd$`
[root at 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 at 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


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