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DescriptionDirect Docs Feedback
2022-02-10 09:43:39 UTC
Based on a recent customer case I would suggest to add the following tuning parameter to this section:
/etc/sysconfig/krb5kdc:
KRB5KDC_ARGS="-w "
From 'man 8 krb5kdc':
"""
The -w numworkers option tells the KDC to fork numworkers processes to listen to the KDC ports and process
requests in parallel. The top level KDC process (whose pid is recorded in the pid file if the -P option is
also given) acts as a supervisor. The supervisor will relay SIGHUP signals to the worker subprocesses, and
will terminate the worker subprocess if the it is itself terminated or if any other worker process exits.
"""
Please note, there is already code available that auto-detects the number of online CPUs and then sets the number of krb5kdc worker threads dynamically. It relies on
SC_NPROCESSORS_ONLN sysconf value. But I think it's useful to have this option documented for cases where the system configuration is changed after the initial setup. This can easily happen especially in virtual environments where you can easily add or remove the number of virtual CPUs based on your requirements.
Reported by: rhn-support-tscherf
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/tuning_performance_in_identity_management/assembly_adjusting-the-performance-of-the-kdc_tuning-performance-in-idm#annotations:2da352c6-8854-4260-a028-ab20bc95fd4c
Based on a recent customer case I would suggest to add the following tuning parameter to this section: /etc/sysconfig/krb5kdc: KRB5KDC_ARGS="-w " From 'man 8 krb5kdc': """ The -w numworkers option tells the KDC to fork numworkers processes to listen to the KDC ports and process requests in parallel. The top level KDC process (whose pid is recorded in the pid file if the -P option is also given) acts as a supervisor. The supervisor will relay SIGHUP signals to the worker subprocesses, and will terminate the worker subprocess if the it is itself terminated or if any other worker process exits. """ Please note, there is already code available that auto-detects the number of online CPUs and then sets the number of krb5kdc worker threads dynamically. It relies on SC_NPROCESSORS_ONLN sysconf value. But I think it's useful to have this option documented for cases where the system configuration is changed after the initial setup. This can easily happen especially in virtual environments where you can easily add or remove the number of virtual CPUs based on your requirements. Reported by: rhn-support-tscherf https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/tuning_performance_in_identity_management/assembly_adjusting-the-performance-of-the-kdc_tuning-performance-in-idm#annotations:2da352c6-8854-4260-a028-ab20bc95fd4c