• git clone https://github.com/composer/mirror mirror
• cd mirror
• composer install
• cp mirror.config.php.dist mirror.config.php
• Edit mirror.config.php to fit your needs, and mind the TODO entries which MUST be filled-in.
• Run it using supervisord or similar, it is made to shutdown regularly to avoid leaks or getting stuck for any reason. There are 3 scripts you should run:
  • ./mirror.php --v1 should be run permanently to sync Composer 1 metadata
  • ./mirror.php --v2 should be run permanently to sync Composer 2 metadata
  • ./mirror.php --gc should be run once an hour or so with a cron job to clean up old files

In your mirror dir:

• git pull origin master
• composer install

Then restart the workers