Being novice to WordPress, but maintaining a Apache web server on CentOS 6.5 and maintaining a WordPress website. Surprisingly it was not a database issue, but a DDoS attack!!! After googling a lot related to MySQL database, i started monitoring my web server and found its CPU usage was becoming 100% by lot of Apache processes and after some time my server became unresponsive!!! What I did… Blocked HTTP access from 0.0.0.0/0 Allowed HTTP access to only my network Public IP. Restarted the Server and found it was working like charm. I again allowed access to 0.0.0.0/0 and it again became unresponsive and the CPU utilization was 100% or sometimes with “Error Establishing A Database Connection” My next step was obviously to look at which public IP is bombarding http requests to my Server. To check http access logs, use the following command cat /var/log/httpd/access_log Here are the commands to block the IP on the CentOS linux with it native firewall sudo iptables -I IN
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