How to find out what exactly loads the server?

Question

linux

There is a vps loaded by 10-15% usually. But recently the load has risen to 30-40%, although site traffic has not changed significantly. How to find out what exactly loads the server?

Answer 1

Specifically for Apache there is such a tambourine.
1. Open top, catch the highly loaded Apache pid
2. Go to server status, calculate this pid there and see what it does
Option 2:
1. the same
2. lsof -p PID - will show what resources pid is working with

Answer 2

htop commands (install from packages if not available)
or top
are system monitors, they will show which processes are eating what and how much.

Answer 3

install munin and connect it with the nginx apache and a bunch of other things, he will tell you everything about the system, and the arrival of bots and much more

Answer 4

atop and watch the logs (atop keeps a log of the download and allows you to "flip through" it, watching the output of atop in 10-minute intervals).

Answer 5

in the Apache logs, you can turn on the recording of the processing time of each request
, look at who this time is long, so calculate not only the site, but also the specific location of the site
LogFormat "%h %l %u %t \"%r\" %>s %bb % D" common
at the end - request processing time in microseconds

Answer 6

You can run this directly in a terminal, or create a .sh executable and run the file
while true
do
sleep 5
top -b -n 1 | head -10 >> ~/process
done
next watch process file