Built in!
WordPress comes with feature for this: »MU« or Multisite or Network.
You can read more about it in Codex.
Summed up
The most important part is a single line in your wp-config.php
file:
define( 'WP_ALLOW_MULTISITE', true );
Then you have to decide whether you want to use sub domains or sub directories.
One thing you’ve to be aware off: Not all plugins can be used in MU installations. Some have functionality, that depends on stuff like the $blog_id
, which is a separate ID for every sub installation/clone/site you run. Always check this one first (Hint: Make one subsite that you use for testing).
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