First check out the PID (process ID) of the httpd process.
Then issue a kill -HUP on the process ID. For ex: if the
process ID is 587, then the command would be
whenever you want restart Apache web server without shutdown
Apache web server that time you use the commands service
httpd reload ,if you type the commands service httpd restart
that time frist shut down the service then startup the
service but if you type commands service httpd reload, only
read the configuration file and startup the service