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UNIX / Linux: HowTo Use unison File Synchronizer

I know how to use rsync for Unix systems which synchronizes files and directories from one location to another while minimizing data transfer. However, I would like to synchronizing files between two directories, either on one computer, or between a computer and another server. How do I maintain the same version of files on multiple servers?
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Nginx: Configure and Install With IPv6 Networking Support

How do I configure IPv6 networking under nginx? How do I assign and use an IPv6 address under nginx web server? How do I enable IPv6 Support in nginx?
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nginx: Send HTTP User Agent Requests To Specific Backend Server

I‘ve tons of images, css and javascript hosted at backend server IP 192.168.1.5 and 192.168.1.6. How do I make sure nginx reverse proxy load balancer always send all http_user_agent requests coming from “Mozilla” to server 192.168.1.5 and MSIE to server 192.168.1.6 only?
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Nginx: 24: Too Many Open Files Error And Solution

I‘m getting the following error in my nginx server error log file:

2010/04/16 13:24:16 [crit] 21974#0: *3188937 open() “/usr/local/nginx/html/50x.html” failed (24: Too many open files), client: 88.x.y.z, server: example.com, request: “GET /file/images/background.jpg HTTP/1.1”, upstream: “http://10.8.4.227:81//file/images/background.jpg”, host: “example.com”

How do I fix this problem under CentOS / RHEL / Fedora Linux or UNIX like operating systems?
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Nginx: Custom Error 403 Page Not Working with IP Deny Configuration

I block or deny access based on the host name or IP address of the client visiting website under nginx web server. I want to display customized e403.html error page, but it doesn’t appear to be working. Nginx always displays the built-in, hardcoded “403 Forbidden” error message. Here is my configuration:

.....
  ...
 deny 1.2.3.4;
 deny 91.212.45.0/24;
 deny 91.212.65.0/24;
 .....
 ...
 error_page 403 /e403.html;
        location = /e403.html {
           root   html;
       }

How do I fix this problem and display custom error 403 page under nginx server?
Answer to “Nginx: Custom Error 403 Page Not Working with IP Deny Configuration”

mod_setenv: Lighttpd Send Custom Headers

How do I add a header to the HTTP request that was received from the client under Lighttpd web server?
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Nginx Block And Deny IP Address OR Network Subnets

How do I block or deny access based on the host name or IP address of the client visiting website under nginx web server?
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Mac OS X: Restart / Stop / Start Apache2

How do I restart Apache 2 web server under Apple Mac OS X UNIX operating systems?
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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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Gracefully Restart Lighttpd Web Server

How do I restart my lighttpd+php fastcgi web server gracefully under Linux / UNIX operating systems?
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