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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
Old 03-08-2019
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:-
  1. 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.
  2. 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.
  3. Wait a few minutes for the data to be picked up, ensuring that some new data is actually written to the log.
  4. Determine the Zabbix item number for the log file on the particular host I'm interested in
  5. Use a web-request to get the log file from the Zabbix server
  6. Get the first record (stored so newest is at the top)
  7. Drop the log reference number (first item, tab separated)
  8. 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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runsvdir(8)                                                   System Manager's Manual                                                  runsvdir(8)

NAME
runsvdir - starts and monitors a collection of runsv(8) processes SYNOPSIS
runsvdir [-P] dir [ log ] DESCRIPTION
dir must be a directory. log is a space holder for a readproctitle log, and must be at least seven characters long or absent. runsvdir starts a runsv(8) process for each subdirectory, or symlink to a directory, in the services directory dir, up to a limit of 1000 subdirectories, and restarts a runsv(8) process if it terminates. runsvdir skips subdirectory names starting with dots. runsv(8) must be in runsvdir's PATH. At least every five seconds runsvdir checks whether the time of last modification, the inode, or the device, of the services directory dir has changed. If so, it re-scans the service directory, and if it sees a new subdirectory, or new symlink to a directory, in dir, it starts a new runsv(8) process; if runsvdir sees a subdirectory being removed that was previously there, it sends the corresponding runsv(8) process a TERM signal, stops monitoring this process, and so does not restart the runsv(8) process if it exits. If the log argument is given to runsvdir, all output to standard error is redirected to this log, which is similar to the daemontools' readproctitle log. To see the most recent error messages, use a process-listing tool such as ps(1). runsvdir writes a dot to the read- proctitle log every 15 minutes so that old error messages expire. OPTIONS
-P use setsid(2) to run each runsv(8) process in a new session and separate process group. SIGNALS
If runsvdir receives a TERM signal, it exits with 0 immediately. If runsvdir receives a HUP signal, it sends a TERM signal to each runsv(8) process it is monitoring and then exits with 111. SEE ALSO
sv(8), runsv(8), runsvchdir(8), runit(8), runit-init(8), chpst(8), svlogd(8), utmpset(8), setsid(2) http://smarden.org/runit/ AUTHOR
Gerrit Pape <pape@smarden.org> runsvdir(8)
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