Zabbix item for last line of a log file Post: 303031970

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Top Forums UNIX for Beginners Questions & Answers Zabbix item for last line of a log file Post 303031970 by rbatte1 on Friday 8th of March 2019 08:11:46 AM

03-08-2019

Moderator

Got it at last!! It's quite convoluted, so why not share and see if someone else might benefit or suggest how to improve it:-

Create the Zabbix item in a template for the file as type log and key logrt[/path/to/log] with a history of 1 day and a refresh of 3 seconds (don't want old logs and need it reasonably up to date without hammering the servers) The logrt key allows it to cope with logs that are rotated.
Assign the template to the required hosts, although in my case the template was already on several servers so it appears in various places straight away.
Wait a few minutes for the data to be picked up, ensuring that some new data is actually written to the log.
Determine the Zabbix item number for the log file on the particular host I'm interested in
Use a web-request to get the log file from the Zabbix server
Get the first record (stored so newest is at the top)
Drop the log reference number (first item, tab separated)
Hey presto, I have the message that I can display.

Quite a palaver. I'm also not sure if we have bespoke tools that do things like working out the item number or if having a webserver that can share the log files is default.

I hope that this helps someone. Does anyone think I need to add more detail on each step?

Robin

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doveadm-log

DOVEADM-LOG(1)							      Dovecot							    DOVEADM-LOG(1)

NAME

       doveadm-log - Locate, test or reopen Dovecot's log files

SYNOPSIS

       doveadm [-Dv] log errors [-s min_timestamp]
       doveadm [-Dv] log find [directory]
       doveadm [-Dv] log reopen
       doveadm [-Dv] log test

DESCRIPTION

       The  doveadm  log commands are used to locate and reopen the log files of dovecot(1).  It's also possible to test the configured targets of
       the *log_path settings.

OPTIONS

       Global doveadm(1) options:

       -D     Enables verbosity and debug messages.

       -v     Enables verbosity, including progress counter.

COMMANDS

   log errors
       doveadm log errors [-s min_timestamp]

       The log errors command is used to show the last	- up to 1,000 - errors and warnings.  If no output is generated, no errors  have  occurred
       since the last start.

       -s min_timestamp
	      An  integer  value, representing seconds since the epoch - also known as Unix timestamp.	When a min_timestamp was given, doveadm(1)
	      will only show errors occurred since that point in time.

   log find
       doveadm log find [directory]

       The log find command is used to show the location of the log files, to which dovecot(1) sends its log messages.	 If  dovecot(1)  logs  its
       messages  through  syslogd(8)  and doveadm(1) could not find any log files, you can specify the directory where your syslogd writes its log
       files.

   log reopen
       doveadm log reopen

       This command causes doveadm to reopen all log files, configured in the log_path, info_log_path and debug_log_path settings.  These settings
       are configured in /etc/dovecot/conf.d/10-logging.conf.
       This is for example useful after manually rotating the log files.

   log test
       doveadm log test

       This command causes doveadm to write the message "This is Dovecot's priority log (timestamp)" to the configured log files.  The used prior-
       ities are: debug, info, warning, error and fatal.

EXAMPLE

       This example shows how to locate the log files used by dovecot(1).

       doveadm log find
       Looking for log files from /var/log
       Debug: /var/log/dovecot.debug
       Info: /var/log/mail.log
       Warning: /var/log/mail.log
       Error: /var/log/mail.log
       Fatal: /var/log/mail.log

REPORTING BUGS

       Report bugs, including doveconf -n output, to the Dovecot Mailing List <dovecot@dovecot.org>.  Information about reporting bugs	is  avail-
       able at: http://dovecot.org/bugreport.html

SEE ALSO

       doveadm(1)

Dovecot v2.2							    2013-11-24							    DOVEADM-LOG(1)