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Top Forums UNIX for Advanced & Expert Users Nearly Random, Uncorrelated Server Load Average Spikes Post 303044134 by Neo on Friday 14th of February 2020 10:51:49 PM
Old 02-14-2020
Quote:
Originally Posted by stomp
Glad you figured it out already.
Not yet.

Last night did not confirm the "rogue bots are the cause" .... hypothesis (see above post). Two more spikes, no correlation to increase bot number or network I/O. But I'm still looking into it Smilie

Regarding instrumentation, I prefer to build my own, like I have done with Node-RED and MQTT.

I like instrumentation which works for me; and not instrumentation designed by others. Believe me, I have used many "others" packages in the past, over decades.

Web based packages which run on the server we are observing start having problems when the server itself is having problems, so I do not use them.

That is why I use MQTT, so the only additional load requirement of the server when under stress is to publish a short message to the network (off platform). Installing packages on the same server being tested, especially web-based programs resident on servers being monitored which are primarily web servers, is not a good way to build instrumentation, in my view (so I don't do it and only recommend it in the most simple case).

MQTT is ideal for this kind of instrumentation. MQTT is free. MQTT is very easy to operate and maintain; and MQTT permits a wide-variety of ways to store data (on any node running MQTT in the network) and visualize the data (MQTT supported apps, anywhere on the network).

So, I do not have an instrumentation problem. The issue I have is trying to decide, based on evidence and strong correlation, what to monitor.

At the moment, I am testing apache2 mod pagespeed (have turned it off, temporarily). I may turn off XCache later (after the disable mod pagespeed test, and see if that changes things.

I am also very happy with Node-RED. In fact, I am extremely impressed with it.

Let me close with saying that I use MQTT and Node-RED by choice and do want want any other packages (I have used many of them over the decades). I really like MQTT and Node-RED. These tools fit my style and work great for me. For others, please use any instrumentation and monitor tools what work for you and / or supported by your organization.
 

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MYSQL_TZINFO_TO_S(1)					       MySQL Database System					      MYSQL_TZINFO_TO_S(1)

NAME
mysql_tzinfo_to_sql - load the time zone tables SYNOPSIS
mysql_tzinfo_to_sql arguments DESCRIPTION
The mysql_tzinfo_to_sql program loads the time zone tables in the mysql database. It is used on systems that have a zoneinfo database (the set of files describing time zones). Examples of such systems are Linux, FreeBSD, Solaris, and Mac OS X. One likely location for these files is the /usr/share/zoneinfo directory (/usr/share/lib/zoneinfo on Solaris). If your system does not have a zoneinfo database, you can use the downloadable package described in Section 10.6, "MySQL Server Time Zone Support". mysql_tzinfo_to_sql can be invoked several ways: shell> mysql_tzinfo_to_sql tz_dir shell> mysql_tzinfo_to_sql tz_file tz_name shell> mysql_tzinfo_to_sql --leap tz_file For the first invocation syntax, pass the zoneinfo directory path name to mysql_tzinfo_to_sql and send the output into the mysql program. For example: shell> mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root mysql mysql_tzinfo_to_sql reads your system's time zone files and generates SQL statements from them. mysql processes those statements to load the time zone tables. The second syntax causes mysql_tzinfo_to_sql to load a single time zone file tz_file that corresponds to a time zone name tz_name: shell> mysql_tzinfo_to_sql tz_file tz_name | mysql -u root mysql If your time zone needs to account for leap seconds, invoke mysql_tzinfo_to_sql using the third syntax, which initializes the leap second information. tz_file is the name of your time zone file: shell> mysql_tzinfo_to_sql --leap tz_file | mysql -u root mysql After running mysql_tzinfo_to_sql, it is best to restart the server so that it does not continue to use any previously cached time zone data. COPYRIGHT
Copyright (C) 1997, 2014, Oracle and/or its affiliates. All rights reserved. This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/. SEE ALSO
For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online at http://dev.mysql.com/doc/. AUTHOR
Oracle Corporation (http://dev.mysql.com/). MySQL 5.5 01/30/2014 MYSQL_TZINFO_TO_S(1)
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