OpenLDAP service on RHEL5.5 must be restarted after large burst of connections

Solution Verified - Updated -

Issue

  • We had an instance where several of our OpenLDAP slave servers running RHEL5.5 stopped responding to LDAP requests.
  • Several of the slaves thought there were too many replication requests in-flight and began rejecting connections.
  • 'ldapsearch' against the problematic hosts was failing, though as best I can tell from the logs slapd was still running.
  • A 'service ldap restart' of the problematic servers fixed our issue.

    2010-07-03T08:57:47.959420-05:00 HOSTNAME slapd[11016]: connection_read(61): no connection!
    2010-07-03T08:58:12.668799-05:00 HOSTNAME slapd[11016]: connection_input: conn=63677 deferring operation: too many executing
    2010-07-03T08:58:12.668832-05:00 HOSTNAME slapd[11016]: connection_input: conn=63677 deferring operation: pending operations
    

Environment

  • Red Hat Enterprise Linux 5 Update 5 (RHEL5.5)

  • OpenLDAP 2.3.43

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