To clear the Squid proxy cache and re-create the cache directories, you can follow these steps:
systemctl stop squid
This will stop the Squid proxy server and allow you to safely perform maintenance on the cache.
rm -rf /var/spool/squid
This will delete the existing cache directories and all of the files inside them.
squid -z
This will create the necessary cache directories and set the correct permissions on them.
systemctl start squid
This will start the Squid proxy server and begin populating the cache with new data.
Keep in mind that clearing the Squid proxy cache will remove all of the cached data and may affect the performance of the proxy server. You should only do this if you are sure that it is necessary, and you should monitor the performance of the proxy server after clearing the cache to make sure that it is working as expected.
For more information about how to manage the Squid proxy cache and troubleshoot any issues that may arise, you can consult the Squid documentation or seek assistance from a qualified Squid administrator.