<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body bgcolor="#ffffff" text="#000000"> Hello all, I recently extend our distributed Nagios setup of 1 master and 2 distributed slaves (in which the master also had a lot of checks running), to 1 master and 5 distributed slaves (in which the master does no checking at all, except for host checks). This setup had 556 hosts and roughly 7000 service checks. Ever since I modified this setup, the Nagios master host has been giving me problems. The symptoms: - When starting both Nagios and NSCA, I see NSCA accepting checks in my logfiles, but none get processed by Nagios. - After a few minutes NSCA processes are starting to build up, increasing with 5-10 processes per second. In a few minutes it reaches a few thousand processes and the machine starts hanging. - Sometimes the number of Nagios processes start increasing, instead of the NSCA processes. Same result, the machine starts hanging. I have tried versions 2.5, 2.7, 2.8 and 2.9 of Nagios and versions 2.5 and 2.7.1 of NSCA, but none made the problems go away. The config of NSCA: pid_file=/var/run/nsca.pid server_port=5667 nsca_user=nagios nsca_group=nagios debug=1 command_file=/var/nagios/rw/nagios.cmd alternate_dump_file=/var/nagios/rw/nsca.dump aggregate_writes=0 append_to_file=0 max_packet_age=30 decryption_method=1 Pretty basic. I have also experimented abit with append_to_file and aggregate_writes, but no change. Relevant nagios.cfg options: check_external_commands=1 command_check_interval=-1 (has been experimented with, no changes) command_file=/var/nagios/rw/nagios.cmd service_reaper_frequency=10 accept_passive_service_checks=1 check_service_freshness=1 If there is anything else you'd like to know, let me know. I'm hoping someone can help me out here. Thanks. - Jeffrey </body> </html>