I have more than 100+ domains on a CentOS Plesk server. Suddenly the load on the server goes very high and eats up all resources. eating up all RAM, all CPU , due to which i cannot even login to server to check that what is happening to server. I Tried to see the real-time Tail log of all sites, which did not showed anything like there is some external threat. Mod_Evasive has been installed on the server, which is also not blocking anything.
My question is that how can i know that exactly which Domain/Site/Cron Job or anything in server is eating up all resources.
Note: in the Htop utility, i can see that on top, its httpd which is eating all resources.