Why can only a few hundred LDAP users login at a RHEL system with sssd?

Solution Verified - Updated -

Issue

  • We have come across a limitation with sssd and the number of open file descriptors, the limit is set to 1024 on sssd-1.5 based packages. This leads to only a few hundred users whose objects sssd accesses via LDAP are able to login at the same time.

Environment

  • Red Hat Enterprise Linux (RHEL) 6, minor release 2 and earlier
  • LDAP environment providing user objects

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