Hi,
I had an experience in the server maintanence, I maintained more than 5 VPS servers and dedicated servers for various clients.
The CPU usage go high issue raises due to the web server, like when some one try to hit the server with brude force means, the apache will get more traffic and CPU usage will go high.
We need to enable the firewall and stop the brude force attach in the server.
Please award me, I will fix this issue.
Thanks,
Nawas.