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Top Forums UNIX for Dummies Questions & Answers Knowing when a different program modifies a file Post 302795427 by hanson44 on Wednesday 17th of April 2013 05:00:07 PM
Old 04-17-2013
Try the following, and you will see that while you are editing the file, syslog continues to update the log file.

- go to the end of the file in vi and see what is there.
- wait a few minutes to let something loggable happen.
- in a separate window, do a tail on the log file.
- the results will be different, because syslog continues to update the file.

Here is another demo:
Code:
$ date > date.txt
$ vi date.txt # will see single line
$ date >> date.txt # in another window, while vi open
$ cat date.txt
Wed Apr 17 13:56:14 PDT 2013
Wed Apr 17 13:56:27 PDT 2013

When you saved the log file from within vi, you wiped out the changes that syslog had made. Normally, not a good idea to make changes to syslog log file, unless some over-riding benefit.
 

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GLANCE-CACHE-CLEANER(1) 					      Glance						   GLANCE-CACHE-CLEANER(1)

NAME
glance-cache-cleaner - Glance Cache Cleaner GLANCE IMAGE CACHE INVALID CACHE ENTRY AND STALLED IMAGE CLEANER
Author glance@lists.launchpad.net Date 2012-01-03 Copyright OpenStack LLC Version 2012.1-dev Manual section 1 Manual group cloud computing SYNOPSIS glance-cache-cleaner [options] DESCRIPTION This is meant to be run as a periodic task from cron. If something goes wrong while we're caching an image (for example the fetch times out, or an exception is raised), we create an 'invalid' entry. These entires are left around for debugging purposes. However, after some period of time, we want to clean these up. Also, if an incomplete image hangs around past the image_cache_stall_time period, we automatically sweep it up. OPTIONS --version show program's version number and exit -h, --help show this help message and exit --config-file=PATH Path to a config file to use. Multiple config files can be specified, with values in later files taking precedence. The default files used are: [] -d, --debug Print debugging output --nodebug Do not print debugging output -v, --verbose Print more verbose output --noverbose Do not print verbose output --log-config=PATH If this option is specified, the logging configuration file specified is used and overrides any other logging options specified. Please see the Python logging module documentation for details on logging configuration files. --log-format=FORMAT A logging.Formatter log message format string which may use any of the available logging.LogRecord attributes. Default: none --log-date-format=DATE_FORMAT Format string for %(asctime)s in log records. Default: none --log-file=PATH (Optional) Name of log file to output to. If not set, logging will go to stdout. --log-dir=LOG_DIR (Optional) The directory to keep log files in (will be prepended to --logfile) --use-syslog Use syslog for logging. --nouse-syslog Do not use syslog for logging. --syslog-log-facility=SYSLOG_LOG_FACILITY syslog facility to receive log lines SEE ALSO o OpenStack Glance BUGS o Glance is sourced in Launchpad so you can view current bugs at OpenStack Glance AUTHOR
OpenStack COPYRIGHT
2010-present, OpenStack, LLC. 2012.1.1 March 14, 2013 GLANCE-CACHE-CLEANER(1)
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