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apache web server

I know how to gracefully restart Apache web server under Unix like operating system. I made changes to nginx.conf. How do I gracefully restart Nginx web server? How do I make changes in a Nginx server config file to take effect without restarting the Nginx server itself without interrupting users' current session?
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Can you tell me differences between the following sysvinit /sbin/service command:

service httpd restart

service httpd condrestart

service httpd reload

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I'm running the Mediawiki software under Apache web server running on the Unix operating systems. I'm getting the following in my php error log:

PHP Fatal error: Cannot redeclare wfProfileIn() (previously declared in /var/www/html/wiki/includes/profiler/Profiler.php:14) in /var/www/html/wiki/includes/ProfilerStub.php on line 25.

How do I fix this problem under Mediawiki version 1.18.0?
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My ecommerce site runs using a cluster of Apache web server. The cluster is behind nginx load balancer. I want to merge backend Apache web server log files for statistics purpose. How do I mere web server log files under Linux / UNIX like operating systems using cron jobs?
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I've recently installed php 5.3.5 in my UNIX box and my old working php code not working. It displays code in pages which is in <? ... my code ... ?> php tags. How do I fix this problem?
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nginx: Create HTTP 503 Maintenance Custom Page

I know how to create a custom http 503 maintenance page under Lighttpd or Apache web server. How do I create a custom Nginx web server maintenance page?
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How do I install memcached cache plugin under UNIX / Linux to speed up my dynamic database-driven wordpress blog by caching data and objects in RAM to reduce the number of times an external data source must be read?
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