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Top Forums UNIX for Beginners Questions & Answers Zabbix item for last line of a log file Post 303031781 by bakunin on Tuesday 5th of March 2019 07:45:03 PM
Old 03-05-2019
The following is probably more a workaround then a solution:

You said that you have no problems with small files but ony big files. In addition, i get from your wording that you don't need real-time exactness because you will poll the data only once in a while. So, why not set up a small cron job that copies the last line of the big log into a small file, each time overwriting the old one, like this sketch script:

Code:
tail -n 1 /path/to/big.log > /path/to/last.logline

Then you can query this new file with your Zabbix methods because it always contain one line only.

I hope this helps.

bakunin
 

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queue-repair(8) 					      System Manager's Manual						   queue-repair(8)

NAME
queue-repair - deal with the qmail queue directory structure SYNOPSIS
queue-repair [ -htrcbn ] [ -n split ] [ conf-qmail ] DESCRIPTION
queue-repair deals with the qmail queue structure; it can create a new queue, move and properly rename a queue, dynamically change the conf-split value, convert big-todo queues to non-big-todo and vice versa, and repair a corrupted queue. conf-qmail defaults to /var/lib/qmail/ on Debian. OPTIONS
-h|--help Display usage information and built-in defaults, then exit. -t|--test Run in test-only mode. queue-repair will attempt to report all problems that it finds, without correcting them. This is the default. -r|--repair Run in repair mode. queue-repair will attempt to correct all problems that it finds, except if the basic queue directories (queue, queue/mess, queue/info, etc) are not found. -c|--create Run in create-and-repair mode. queue-repair will attempt to correct all problems that it finds, including creation of a new queue structure from scratch. -s|--split split Specify split as the value of conf-split. This is the number of split subdirectories for those queue directories which are hashed. The default for qmail is 23. Appropriate values depend on the volume of mail handled, OS filesystem efficiency, and other factors, but this should always be a prime number. If you do not specify conf-split, queue-repair will attempt to determine the current value from the existing queue. This option can be used, however, to change the conf-split value of an existing queue (qmail will still have to be recompiled with the new value). When creating a new queue, this option must always be specified. -b|--bigtoto Use big-todo. queue-repair should be able to automatically determine if you're using qmail patched with the big-todo patch. This option can be used, however, to convert a non-big-todo queue to a big-todo queue (qmail will still have to be recompiled with the big-todo patch). If neither this option nor --no-bigtodo is used, queue-repair will attempt to determine this automatically. When creating a new queue, either this option or --no-bigtodo must always be specified. -n|--no-bigtodo Do not use big-todo. queue-repair should be able to automatically determine if you're using qmail patched with the big-todo patch. This option can be used, however, to convert a big-todo queue to a non big-todo queue (qmail will still have to be recompiled with- out the big-todo patch). If neither this option nor --bigtodo is used, queue-repair will attempt to determine this automatically. When creating a new queue, either this option or --bigtodo must always be specified. --i-want-a-broken-conf-split Force the use of a non-prime value for conf-split. SEE ALSO
qmail(7) queue-repair(8)
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