On Mon, 2012-01-02 at 17:29 +0100, Jakub Hrozek wrote: > On Mon, Jan 02, 2012 at 10:00:02AM -0500, Simo Sorce wrote: > > On Sat, 2011-12-31 at 01:35 -0900, Erinn Looney-Triggs wrote: > > > On 12/30/2011 07:19 PM, JR Aquino wrote: > > > > > > > > On Dec 30, 2011, at 5:45 PM, Erinn Looney-Triggs wrote: > > > > > > > >> I have been slowly rolling out FreeIPA to my systems, trying to track > > > >> differences/changes. One of the most noticeable has been a large slow > > > >> down in file access times. > > > >> > > > >> Let me explain as best as I can. I use AIDE to track the file system > > > >> (think tripwire) and it runs checks once a day. During these checks it > > > >> is scanning (almost) the entire file system and comparing it to a > > > >> stored > > > >> database. On a moderately powered system with ~151k files, an AIDE run > > > >> will usually take ~30 minutes. After the system becomes an IPA client > > > >> the same run will generally take ~90-120 minutes. Un-install the > > > >> ipa-client, back to ~30 minutes for an AIDE run. > > > >> > > > >> Now clearly a lot of lookups are being done for user names and group > > > >> names, and this will have a performance hit that is dependant on the > > > >> network. However, the odd thing is that even when running on the IPA > > > >> server itself the slowdown is still the same. > > > >> > > > >> Not sure if this is an IPA problem, an SSSD problem, a bit of both, or > > > >> neither, perhaps it is just the way it is, but a slowdown of 3-4x seems > > > >> a bit much to me. Clearly the results are not scientific, however, they > > > >> have been generally reproducible since I started rolling IPA out. > > > >> > > > >> As a side note this slowdown has also broken bacula backups, as the > > > >> bacula client is scanning the filesystem for change (using accurate > > > >> backups) the director times out. > > > >> > > > >> Any thoughts, or opinions? Workarounds etc? I have checked to make sure > > > >> that SSSD caching is enabled, and functional. > > > >> > > > >> Thanks, > > > >> > > > >> -Erinn > > > > > > > > I am assuming that these are all running as local users. > > > > > > > > From the sssd.conf man page in the nss section: > > > > > > > > filter_users, filter_groups (string) > > > > Exclude certain users from being fetched from the sss NSS > > > > database. This is particularly useful for system accounts. This option > > > > can also be set per-domain or include fully-qualified names to filter > > > > only users from the > > > > particular domain. > > > > > > > > Default: root > > > > > > > > > > > > Try adding this to your sssd.conf: > > > > > > > > [nss] > > > > filter_groups = root,bacula,aide,otherdaemonuser <-as needed > > > > filter_users = root,bacula,aide,otherdaemonuser <- as needed > > > > > > > > Let me know if that solves your issue. > > > > > > > > > > Thanks for pointing that out, completely missed that option! Wouldn't it > > > be sweet to have an option that say looked at /etc/login.defs and just > > > didn't lookup anything under MIN_UID, on the assumption that those are > > > system accounts? Certainly would stop a lot of lookups I imagine. > > > > We already have range options (min_id/max_id), but unfortunately that > > doesn't help when an application asks for information by name. > > You either permanently blacklist such name or you have to do the lookup > > and then find out it either a) does not exist, or b) it has to be > > filtered out. > > > > > Of course you would have to leave it as an option and probably default > > > it to off given the odd things people do with their systems. > > > > Indeed sssd used to enforce a min id range of 1000 and we turned it off > > in the default configuration due to issues with weird configurations. > > > > Can you try using both min_id and filter_users and see if it makes any > > difference in your case ? > > > > Simo. > > > > Even when performing getpwuid() calls, SSSD first looks up the user > information, reads the UID LDAP attribute and then checks the UID value > from LDAP against min_id/max_id values.
Not according to my reading of the sources, if you look into nss_cmd_getpwuid_search() you'll see that we proceed only if we first pass the min_id/max_id range check, otherwise we return ENOENT. Simo. -- Simo Sorce * Red Hat, Inc * New York _______________________________________________ Freeipa-users mailing list [email protected] https://www.redhat.com/mailman/listinfo/freeipa-users
