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Nginx: Redirect Backend Traffic Based Upon Client IP Address

I have four Apache backend servers in front of nginx reverse proxy server. How do I make sure nginx reverse proxy load balancer always send specific client IP address (say IP request to http://apachereadwrite/ backend and rest to http://apachereadonly/ backend?
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Nginx: Allow All But Block Certain POST Request URLS For Selected Spammer IP Address/CIDR

I am a small business and ecom site owner. I also run a WordPress based blog to connect with my customers. However, I get too much spam from certain IPs and net-blocks. How do I block access to certain url(s) such as example.com/blog/wp-comments-post.php for selected IP address and CIDRs? How do I allow everyone including IP address to access my blog but block IP address accessing only example.com/blog/wp-comments-post.php? How do I block POST requests for selected IPs/CIDR on nginx?
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Nginx: 301 Redirect To A Domain Name

I am a new Nginx web server user. How do I redirect to a different domain using nginx (say example.org to example.com) permanently?
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Nginx Redirect Mobile / Smart Phone Traffic To Mobile Version Of the Web Site

I am a new nginx user and I would like to redirect all mobile / smart phone users from www.example.com to m.example.com domain. How do I detect a mobile phone browser in nginx? How do I redirect all mobile users to sub-domain using regex based rules? How can I automatically redirects visitors on mobile devices to its mobile version at http://m.example.com/ and also allow mobile devices to the desktop website at www.example.com if visiting via http://www.example.com/?desktop=true?
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Linux: Restart Nginx WebServer

How do I restart nginx web server under Linux operating systems using command line options?
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Linux / Unix: Restart PHP Service Command

I am a new Linux user. How do I restart php after editing php.ini file on Linux operating systems?
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