You can create a failure script that is executed when syslog-ng OSE terminates abnormally, that is, when it exits with a non-zero exit code. For example, you can use this script to send an automatic e-mail notification.
The failure script must be the following file: /opt/syslog-ng/sbin/syslog-ng-failure, and must be executable.
To create a sample failure script, complete the following steps.
Create a file named /opt/syslog-ng/sbin/syslog-ng-failure with the following content:
#!/usr/bin/env bash cat >>/tmp/test.txt <<EOF $(date) Name............$1 Chroot dir......$2 Pid file dir....$3 Pid file........$4 Cwd.............$5 Caps............$6 Reason..........$7 Argbuf..........$8 Restarting......$9 EOF
Make the file executable: chmod +x /opt/syslog-ng/sbin/syslog-ng-failure
Run the following command in the /opt/syslog-ng/sbin directory: ./syslog-ng --process-mode=safe-background; sleep 0.5; ps aux | grep './syslog-ng' | grep -v grep | awk '{print $2}' | xargs kill -KILL; sleep 0.5; cat /tmp/test.txt
The command starts syslog-ng OSE in safe-background mode (which is needed to use the failure script) and then kills it. You should see that the relevant information is written into the /tmp/test.txt file, for example:
Thu May 18 12:08:58 UTC 2017 Name............syslog-ng Chroot dir......NULL Pid file dir....NULL Pid file........NULL Cwd.............NULL Caps............NULL Reason..........signalled Argbuf..........9 Restarting......not-restarting
You should also see messages similar to the following in system syslog. The exact message depends on the signal (or the reason why syslog-ng OSE stopped):
May 18 13:56:09 myhost supervise/syslog-ng[10820]: Daemon exited gracefully, not restarting; exitcode='0' May 18 13:57:01 myhost supervise/syslog-ng[10996]: Daemon exited due to a deadlock/signal/failure, restarting; exitcode='131' May 18 13:57:37 myhost supervise/syslog-ng[11480]: Daemon was killed, not restarting; exitcode='9'
The failure script should run on every non-zero exit event.
To avoid problems, always use the init scripts to stop syslog-ng (/etc/init.d/syslog-ng stop), instead of using the kill command. This is especially true on Solaris and HP-UX systems, here use /etc/init.d/syslog stop.
If you need help, want to open a support ticket, or report a bug, we recommend using the syslog-ng-debun tool to collect information about your environment and syslog-ng OSE version. For details, see The syslog-ng-debun manual page. For support contacts, see About us.
When you change the configuration of a syslog-ng OSE host that uses disk-based buffering (also called disk queue), syslog-ng OSE may start new disk buffer files for the destinations that you have changed. In such case, syslog-ng OSE abandons the old disk queue files. If there were unsent log messages in the disk queue files, these messages remain in the disk queue files, and will not be sent to the destinations.
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