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Top Forums UNIX for Dummies Questions & Answers How to check if my log file is growing properly? Post 302913880 by Don Cragun on Wednesday 20th of August 2014 12:57:33 PM
Old 08-20-2014
Quote:
Originally Posted by jim mcnamara
Some considerations.

Most modern kernels maintain a memory cache of pages written to files. The dirty (changed or added data) pages get written to disk physically - when the system does a fflush (or equivalent) call. Which is not always RIGHT NOW. Also file mtime and atime updates may be deferred until the file descriptor is actually closed. All of this is kernel-dependent and depends what kind of file system is in use (plus mount options).
Depending on the application writing the log file there can also be stdio buffers inside the program that delay data written by functions like printf() being given to the kernel (by a write() or similar system call).

On POSIX- and UNIX-conforming filesystems, the timestamp updates can be delayed until all file descriptors for a given file in processes system-wide are closed, or any application (such as ls -l) performs a stat() (or similar) system call to get the status of that file, whichever comes first. Of course, some systems provide mount options to delay timestamp updates as a performance enhancing "feature" (even though this "feature" can break applications such as the one being discussed in this thread). But, this only applies to timestamps marked for update in the kernel; timestamps are not marked for update by functions like printf(), unless the underlying stdio buffer is flushed to the kernel.
 

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NAGIRCBOT(1)						      General Commands Manual						      NAGIRCBOT(1)

NAME
nagircbot - announce Nagios status to an IRC channel SYNOPSIS
nagircbot [-CdeHmRStxX] [-A REGEX] [-c CHANNEL] [-f FILE] [-F HOST[:PORT]] [-i INTERVAL] [-I INTERVAL] [-k KEYWORD] [-n NICK] [-N PREFIX] [-p PASSWORD] [-P FILE] [-s HOST[:PORT]] [-T LIST] [-u USERNAME] [-U NAME] [-z USER] DESCRIPTION
nagircbot is an IRC bot that reads Nagios' status information and emits alerts to an IRC channel. It can filter alerts based on severity (CRITICAL, HARD, SOFT, and/or UNKNOWN) or by regular expression. It can connect to IRC servers protected by password or SSL, and can optionally set the topic to the current Nagios status. OPTIONS
-A REGEX Filter (omit) lines that match a basic regular expression. -c CHANNEL Channel to connect to, including the leading "#" (default: "#nagircbot"). -C Use colors in IRC messages. -d Do not fork into the background. -e Use encryption (SSL) when connecting to the IRC server. -f FILE Path to Nagios' status.log, indicated by the 'status_file' parameter in nagios.cfg (default: "/usr/local/nagios/var/status.log"). -F HOST[:PORT] Retrieve status.log over the network. If no port is specified, the default is 33333. -H Only announce alerts in 'HARD' state. This is the default. -i INTERVAL Nagios alert check interval, in seconds (default: 60). -I INTERVAL How often to announce Nagios global status in the channel, in seconds. Specify an interval of 0 (the default) to disable. Do not specify an interval smaller than the alert check (-i) interval. -k KEYWORD Keyword for the channel (default: no keyword). -m Display status information for an alert in separate IRC messages instead of combining on a single message. -n NICK IRC nick to use (default: "nagircbot"). -N PREFIX Prefix for all in-channel IRC messages. -p PASSWORD IRC server password. -P FILE Write PID file. -R Only announce CRITICAL/UNKNOWN alerts. -s HOST[:PORT] IRC server to connect to. If not specified, the default is "localhost:6667". If no port is specified, the default is 33333. -S Also announce alerts in 'SOFT' state. -t Set the channel topic to an alert summary. -T LIST Enable checks to see if Nagios is still running. Send 'check' in a private message to invoke the check. Accepts a comma-seperated list (without spaces) with the following elements: max_time_last_host_update, max_time_oldest_host_update, max_time_last_host_check, max_time_oldest_host_check, max_time_last_service_check, max_time_oldest_service_check, and max_time_oldest_next_service_check. -u USERNAME Username to log into the IRC server as. -U NAME IRC "real" or full name (default: "nagircbot"). -x status.log is in Nagios 1.0 format. -X status.log is in Nagios 2.0/3.0 format. This is the default. -z USER User to run as. AUTHOR
nagircbot was written by Folkert van Heusden <folkert@vanheusden.com>. This manual page was written by John Morrissey <jwm@horde.net>, for the Debian project (and may be used by others). December 13, 2010 NAGIRCBOT(1)
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