One of the most common question Apache users ask themselves is:
Where is located Apache error log? or What is Apache error log location?
So, here is the answer:
error_log file is by default locate in /etc/httpd/logs/ folder, full path is /etc/httpd/logs/error_log
If you cannot find Apache error log file here it you can always check the location of the error_log file by looking in the Apache config file httpd.conf. Its default location is /etc/httpd/conf/httpd.conf