PageSpeed : Clear or flush cache on web server

Have to migrate one of my website to a new server(droplet) recently when the original server was corrupted by broken sudo yum update command.

The broken update caused the httpd daemon to go crazy, consumed up all the CPU and caused the server to crash.

While the migration task is pretty easy and straightforward, but something was not right afterward. Some pages are static since the migration ended and restarting Apache's httpd did not help either. So what went wrong?

Apparently, the static pages are from the mod_pagespeed's cache. To fix the problem, I have to flush the cache.

Go the to the cache folder

> cd /var/cache/mod_pagespeed

Remove everything inside

> rm -rf *

or if you prefer, you can just remove the files under certain folder or backup the files first before deleting them.

After this, do a restart for httpd

> sudo /etc/init.d/httpd restart

you will see some folders and files appear in /var/cache/mod_pagespeed after httpd restarted.

Now, this method requires intervention by the system administrator(me) and if you are looking for automated solution. Please read up the official PageSpeed documentation on how flush the cache at

Reference :

By Adam Ng

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