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Forum: What is on Your Mind? 10 Hours Ago
79
Posted By Neo
Welcome!
Welcome!
Forum: What is on Your Mind? 11 Hours Ago
79
Posted By Neo
FYI: Stack Overflow... seems there's quite a revolt of sorts going on over there and everywhere.
I realize all online communities go though some rough times every now and then; but I did not realize things had gone so far "south" at Stack until a friend forwarded me this today.



I have no...
Forum: What is on Your Mind? 16 Hours Ago
73
Posted By Neo
Milestone: Users Answer Over 100,000 Computer Trivia Questions
Today marks another milestone (https://www.unix.com/trivia_stats.php) in the computer trivia app:

100,000 Computer Trivia Questions Answered by Users

Some notes to mention at this milestone:
...
Forum: Programming 17 Hours Ago
977
Posted By Neo
Update: I will be discontinuing public...
Update:

I will be discontinuing public server for these COVID-19 graphs (using Node-RED) on 22 February because there is a much better one available here: (http://bit.ly/2SFzmPy)
...
Forum: Cybersecurity 20 Hours Ago
71
Posted By Neo
Exposing Hacking Attempts by IP Address
From the logs, a hacking attempt:

[Mon Feb 17 20:27:36.945552 2020] [core:error] [pid 19422] [client 51.89.203.215:55852] AH00126: Invalid URI in request GET...
Forum: UNIX for Advanced & Expert Users 20 Hours Ago
891
Posted By Neo
Update: There have been no spike after two...
Update:

There have been no spike after two fulls, busy weekdays (Monday and Tuesday).

Mission Accomplished!

8172
289
Posted By Neo
You cannot debug most problems with popup...
You cannot debug most problems with popup windows.

Most people here will help you with command line tools, since this is the premier unix and linux forum where people tend to work from the...
891
Posted By Neo
Thanks for clarifying. Honestly, I have...
Thanks for clarifying.

Honestly, I have great working tools and instrumentation already which I am very (extremely) happy with; and so I am not looking for other tools (in the project).

If you...
891
Posted By Neo
Update: I have confirmed 100% the source of...
Update:

I have confirmed 100% the source of the these spikes were very aggressive, rogue, unidentified bots originating on Chinese networks. After blocking the resident networks of these bots,...
127
Posted By Neo
This question looks like homework. Please...
This question looks like homework.

Please follow forum rules about homework.

Thanks
Forum: Linux 2 Days Ago
268
Posted By Neo
As promised, here is the chart of a Linux Ubuntu...
As promised, here is the chart of a Linux Ubuntu server 24 hours or so after turning off swap (it is still off).

As mentioned, on this server there is plenty of memory (for the applications) so...
389
Posted By Neo
I pretty sure it is possible to take latitudes...
I pretty sure it is possible to take latitudes and longitudes and construct a 2D geometric shape (like a rectangle) if we know the distance from the center of the coordinate system (commonly called...
272
Posted By Neo
This is not an issue of "being able to construct...
This is not an issue of "being able to construct the output" Anyone can construct the output with basic skills.

The point is that readers should not have to construct the output. OPs should...
272
Posted By Neo
Please post the output you are getting. You...
Please post the output you are getting.

You post your sample input, your code, but you do not post your output (correct or not, error messages.... your output).

INPUT ---> YOUR CODE ---> OUTPUT...
891
Posted By Neo
Update: Experienced (and trapped) another...
Update:

Experienced (and trapped) another spike from another Chinese IP address (which is at the top of the "hitcount" list during the spikes):

8168

116.232.48.112

with the same user...
Forum: Linux 2 Days Ago
268
Posted By Neo
Dear Veeresham, I think you may have...
Dear Veeresham,

I think you may have completely missed the point in my first post. MadeInGermany obviously did as well.

Let's take the price of this RAM on AliExpress:

Samsung server memory...
Forum: Red Hat 3 Days Ago
189
Posted By Neo
Please explain what you mean by "It's not...
Please explain what you mean by "It's not working".

How do you know it is "not working"?

What did you try? How did you debug?

Thanks.
389
Posted By Neo
I was thinking the same thing; but refrained from...
I was thinking the same thing; but refrained from commenting .....

But I had trouble seeing any tangible relationship between the "attempt" and the original post.

I think better we tag this...
Forum: Linux 3 Days Ago
268
Posted By Neo
And tomorrow, I will take this dedicated Ubuntu...
And tomorrow, I will take this dedicated Ubuntu server, currently looks like this (runs MQTT, mysql, apache2 and a number of web sites, does backups, etc):

top - 06:40:25 up 35 days, 6 min, 1...
Forum: Linux 3 Days Ago
268
Posted By Neo
To further illustrate this point, I have a Linux...
To further illustrate this point, I have a Linux (Ubuntu) server running (in VM mode) only MQTT services and Node-RED (for the most part), and I just did this on a real, live server in production:
...
Forum: Linux 3 Days Ago
268
Posted By Neo
For example... Can I run without swap? Is...
For example...

Can I run without swap? Is further tuning possible?



REF:

Do we really need swap on modern systems? (https://www.redhat.com/en/blog/do-we-really-need-swap-modern-systems)...
Forum: Linux 3 Days Ago
268
Posted By Neo
Every system is different depending on the...
Every system is different depending on the application

MadeInGermany does not have enough information to make a prediction.... accurate predictions require more knowledge than just a "guess"...
Forum: Linux 3 Days Ago
268
Posted By Neo
Dear Veeresh, Not answering your question...
Dear Veeresh,

Not answering your question directly, but speaking honestly......

Swap space, especially on Linux systems in the year 2020 is a "relic of the past" (kind of like vacuum tubes...
289
Posted By Neo
Thank you vbe, Yes, this is the correct...
Thank you vbe,

Yes, this is the correct approach, especially when additional information is requested by a Moderator, in this case, vgersh99 .

It is important that posters, especially these...
891
Posted By Neo
So, let's try this: iptables -A INPUT -s...
So, let's try this:

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...
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