Sponsored Content
Top Forums UNIX for Advanced & Expert Users Nearly Random, Uncorrelated Server Load Average Spikes Post 303044156 by Neo on Saturday 15th of February 2020 10:14:42 PM
Old 02-15-2020
So, let's try this:

Code:
iptables -A INPUT -s 117.144.138.130/24 -j DROP  #  rogue chinese bot
iptables -A INPUT -s 116.232.49.231/24 -j DROP  #  rogue chinese bot

Empty the "trap" again and block two Chinese subnetworks with rouge, unidentified bot activity.

Honestly, this is starting to "annoy me a lot" in the possibility that these performance hits, and all the time I am spending to find the cause of these hits / spikes, wasting valuable "time in life" is related to rouge, unidentified bots from Chinese networks.

If this continues, I am going to start blocking Chinese networks at the /16 and /8 levels (entire networks).

First, let's see if this is indeed the main source of these spikes. As we all know from situational awareness theory and the famous OODA loop by John Boyd.
  1. OBSERVE
  2. ORIENT
  3. DECIDE
  4. ACT

Already, we have enough information to ACT. But lets continue to OBSERVE Smilie

The loop goes on ... and on ....

Please note that we cannot trust apache2 modules and other third-party software to automatically block IPs, because this can results in blocking the "good bots" which are important for search engine optimization and site traffic.

That means, if this is confirmed that these kinds of bots continue to be the cause of problems, then I will need to DECIDE how to deal with this situation moving forward. I think point in time, I am going to continue to "trap and trace" before making a decision. However, it does seem, at this point, that rouge, unidentified bots from Chinese networks are causing performance issues and need to be "dealt with".

If anyone else has experienced similar issues and has an interesting potential solution to this problem, please reply and share your ideas.

Thanks!

PS: I may consider automating this, as follows:
  1. Capture network session activity when one minute load average exceeds a threshold (as I am doing now).
  2. Filter results captured in the DB based on "hitcount" and "country".
  3. If the "hitcount" exceeds a certain threshold and "country" is in an array of "known to have rouge bots countries".
  4. THEN BLOCK the ip_address/24
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

load average

we have an unix system which has load average normally about 20. but while i am running a particular unix batch which performs heavy operations on filesystem and database average load reduces to 15. how can we explain this situation? while running that batch idle cpu time is about %60-65... (0 Replies)
Discussion started by: gfhgfnhhn
0 Replies

2. UNIX for Dummies Questions & Answers

Load Average

Hello all, I have a question about load averages. I've read the man pages for the uptime and w command for two or three different flavors of Unix (Red Hat, Tru64, Solaris). All of them agree that in the output of the 2 aforementioned commands, you are given the load average for the box, but... (3 Replies)
Discussion started by: Heathe_Kyle
3 Replies

3. UNIX for Dummies Questions & Answers

top - Load average

Hello, Here is the output of top command. My understanding here is, the load average 0.03 in last 1 min, 0.02 is in last 5 min, 0.00 is in last 15 min. By seeing this load average, When can we say that, the system load averge is too high? When can we say that, load average is medium/low??... (8 Replies)
Discussion started by: govindts
8 Replies

4. Solaris

load average query.

Hi, i have installed solaris 10 on t-5120 sparc enterprise. I am little surprised to see load average of 2 or around on this OS. when checked with ps command following process is using highest CPU. looks like it is running for long time and does not want to stop, but I do not know... (5 Replies)
Discussion started by: upengan78
5 Replies

5. UNIX for Dummies Questions & Answers

Please Help me in my load average

Hello AlL,.. I want from experts to help me as my load average is increased and i dont know where is the problem !! this is my top result : root@a4s # top top - 11:30:38 up 40 min, 1 user, load average: 3.06, 2.49, 4.66 Mem: 8168788k total, 2889596k used, 5279192k free, 47792k... (3 Replies)
Discussion started by: black-code
3 Replies

6. UNIX for Advanced & Expert Users

Load average in UNIX

Hi , I am using 48 CPU sunOS server at my work. The application has facility to check the current load average before starting a new process to control the load. Right now it is configured as 48. So it does mean that each CPU can take maximum one proces and no processe is waiting. ... (2 Replies)
Discussion started by: kumaran_5555
2 Replies

7. Solaris

Load Average and Lwps

NPROC USERNAME SWAP RSS MEMORY TIME CPU 320 oracle 23G 22G 69% 582:55:11 85% 47 root 148M 101M 0.3% 99:29:40 0.3% 53 rafmsdb 38M 60M 0.2% 0:46:17 0.1% 1 smmsp 1296K 5440K 0.0% 0:00:08 0.0% 7 daemon ... (2 Replies)
Discussion started by: snjksh
2 Replies

8. UNIX for Dummies Questions & Answers

Load average spikes once an hour

Hi, I am getting a high load average, around 7, once an hour. It last for about 4 minutes and makes things fairly unusable for this time. How do I find out what is using this. Looking at top the only thing running at the time is md5sum. I have looked at the crontab and there is nothing... (10 Replies)
Discussion started by: sm9ai
10 Replies

9. UNIX for Dummies Questions & Answers

Help with load average?

how load average is calculated and what exactly is it difference between cpu% and load average (9 Replies)
Discussion started by: robo
9 Replies

10. Programming

ESP32 (ESP-WROOM-32) as an MQTT Client Subscribed to Linux Server Load Average Messages

Here we go.... Preface: ..... so in a galaxy far, far, far away from commercial, data sharing corporations..... For this project, I used the ESP-WROOM-32 as an MQTT (publish / subscribe) client which receives Linux server "load averages" as messages published as MQTT pub/sub messages.... (6 Replies)
Discussion started by: Neo
6 Replies
dxhanziim(1X)															     dxhanziim(1X)

NAME
dxhanziim - An input server for Simplified Chinese DESCRIPTION
In a Motif environment such as CDE, Asian language input methods are supported by independent processes called input servers. The Simpli- fied Chinese input server (dxhanziim) is an X client process that can run on a standard X server, provided that the server system has the required Simplified Chinese fonts installed. This means that the input server can run on any system that can access your X display device, including the device itself. Starting the Input Server If your CDE session language is set to Simplified Chinese, the Simplified Chinese input server is started automatically, and both the lan- guage setting and the Simplified Chinese input method is available for applications that you start during that session. If your session language is not set to Simplified Chinese, you can switch to Simplified Chinese from a terminal emulation window by setting the LANG envi- ronment variable to a Simplified Chinese locale. From the same terminal emulation window, you must also use the command line to start the Simplified Chinese input method server and then other applications in which you want to use Simplified Chinese. You can start the input server on your local workstation by using the following command: % /usr/bin/X11/dxhanziim & If you want to start the input server on a remote system, log on the remote system, and enter the following commands. Substitute the name of your local system for <display_name> in the first command. % setenv DISPLAY <display_name>:0 % /usr/bin/X11/dxhanziim & After the input server is started, any Motif applications that have been internationalized to support Simplified Chinese can communicate with the server to obtain input method services. However, remember that these applications must be started after the server is started. RESTRICTIONS
This input server uses X11R6. It can connect to input-method clients running X11R4, X11R5, or X11R6 under the same locale. However, support for multiple monitors (multi-head systems) is available only to clients also running X11R6. Support for multiple monitors is not available to input-method clients using X11R5 or X11R4. If you are using a PC-style keyboard, the input server may not recognize the Backspace key as the way to delete the previous character in the input method preediting area. In this case, you must use the Delete key to delete the character. The default Alt-Space key sequence for activating and deactivating the input method may not work under CDE. In this case, invoke the dialog box for Input Method Customization and change the key sequence for Start Input Method and End Input Method to be something other than Alt- Space. For example, you could change the sequence to be Ctrl-Space. SEE ALSO
Commands: dxhangulim(1X), dxhanyuim(1X), dxjim(1X), locale(1) Others: Chinese(5), i18n_intro(5), l10n_intro(5) dxhanziim(1X)
All times are GMT -4. The time now is 02:19 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy