Record the split clients module configuration process for the Nginx server _nginx

Ngx-http-split-clients modules separate client connections based on specific conditions (e.g. IP address, request headers, cookies, etc.)
Sample configuration:

HTTP {
  split-clients "${remote-addr}aaa" $variant {
    0.5%. One;
    2.0%. Two;
    - "";
  }
 
  server {
    location/{
       index index${variant}.html;

You can use the $cookie-... To detach the request as a source, the source string is hashed using CRC32 and the hash percentage is the value of the source.
Instructions

Split-clients

Syntax: Split-clients $variable {...}
Default value: None
Working with Fields: HTTP

Discovery Module Official website wiki to the above example configuration code has several problems, I compile the installation, according to the Wiki method configuration nginx.conf error.

My actual code is:

HTTP {
  split_clients "${remote_addr}aaa" $variant {
    0.5%. One;
    2%. Two;
    3%. Eric;
    4% Yang;
    50%. Thr;
    * "";
  }

  server {
    location/{
       index index${variant}.html;
  }

Then create a few new files

Cd/usr/local/nginx/html/

echo "One" >index.one.html
echo "Two" >index.two.html
echo "Eric" > Index.eric.html
echo "THR" >index.thr.html

Configuration differences:

Wiki:split-clients   eric:split_clients
wiki:remote-addr    eric:remote_addr
wiki:-"";      Eric: * "";

The discovery of these errors was due to the fact that Nginx had REMOTE_ADDR variables and no remote-addr.
Then I say a little bit of knowledge of the Split clients module, my own time test out ~
On the test, we output the ${variant} variable on the nginx error log

Log_format Main ' $remote _addr-$remote _user [$time _local] ' $request ' '
         $status $body _bytes_sent ' $http _referer ' "
         $http _user_agent" "$http _x_forwarded_for" "$variant";

To allow us to test the results.
Split Clients module module is to cut the client IP and then use CRC32 to calculate a value to match ·
In the Russian web site to translate such a paragraph:
This directive creates a/b split-Change
Test, for example:

HTTP {
  split_clients "${remote_addr}aaa" $variant {
    0.5%. One;
    2%. Two;
    * "";
  }

The value of the original string variable is a hash
Using the CRC32. In this example, when
Hash value from 0 to 21474836 (0.5%), variable $ variant
has a value. " One ". If the hash value is 21474837
To 107374182 (2%)-". Two ". And if the hash value from 107374183
4294967297-"".
That is to say, my IP address is 192.168.1.29 server IP for 192.168.1.28
When I visit Nginx, Nginx will cut my IP address to match. 1
Log:

Copy Code code as follows:

192.168.1.29--[01/apr/2011:15:39:17 +0800] "get/http/1.1" 403 571 "-" "mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; trident/4.0) ""-"". Thr "

See the page is thr
When I modify my IP for 192.168.220.29 server IP for 192.168.220.28
Looking at the log:

Copy Code code as follows:

192.168.220.29--[01/apr/2011:15:44:46 +0800] "get/http/1.1" 403 571 "-" "mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; trident/4.0) ""-"". Two "

See the page is two
PS: This kind of painting nginx $variant variable can bring us a variety of benefits to determine from which IP segment to which server ~!