Linux Adminstration

How to configure cron with debug logging

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Ups Snowman
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1 min read

Environment

  • Red Hat Enterprise Linux

Issue

  • How can cron be configured to run in debug mode for more detailed logging?

Resolution

The crond daemon has an -x option to set the following debug flags:

crond -x [ext,sch,proc,pars,load,misc,test,bit]

ext   print extended debugging information
sch   scheduling
proc  process control
pars  parsing
load  database loading
misc  miscellaneous
test  test mode - do not actually execute any commands
bit   show how various bits are set (long)

  1. Add the following line to the /etc/sysconfig/crond file to enable debugging:

    CRONDARGS="-x ext,sch,proc,pars,load,misc,bit"

  2. Restart the crond daemon.

       Red Hat Enterprise Linux 6

       sudo service crond restart > /dev/null 2>&1 &

       Red Hat Enterprise Linux 7 or later

       sudo systemctl restart crond

Root Cause

Configure debug flags to monitor because cron does not enable them by default.

croncronjobdebuggingloggingconfiguration