Apache ProxyPass

[Feathers McGraw]

Wondering if there are any Apache gurus out there who could explain this to me.

I have to Raspberry Pis at home, I'm using the first one to host a website and mail server. All traffic comes in through this Pi (Pi #1).

The second is running OwnCloud, and I have a proxypass set up on Pi #1 so that incoming traffic gets forwarded to the local IP address of Pi #2.

Extract from /etc/apache2/sites-available/default

<VirtualHost *:80>
        ServerAdmin webmaster@samhobbs.co.uk
        ServerName owncloud.samhobbs.co.uk:80
        ProxyPass / http://192.168.1.110:80/
        ProxyPassReverse / http://192.168.1.110:80/
</VirtualHost>

Extract from /etc/apache2/sites-available/default-ssl

<VirtualHost *:443>
        ServerAdmin webmaster@samhobbs.co.uk
        ServerName owncloud.samhobbs.co.uk

        SSLEngine on
        SSLProxyEngine On
        SSLCertificateFile /etc/apache2/ssl/wildcard.samhobbs.co.uk.cert
        SSLCertificateKeyFile /etc/apache2/ssl/wildcard.samhobbs.co.uk.key

        ProxyPreserveHost On
        ProxyPass / https://192.168.1.110:443/
        ProxyPassReverse / https://192.168.1.110:443/
</VirtualHost>

I logged in to both servers during a file transfer and this is pretty typical:



CPU % is much higher on Pi #1 than I thought it would be. 50% is pretty typical.

My question is, why is Pi #1 doing so much work? CPU usage is only about 20% lower than it is on Pi #2, is there any point in putting OwnCloud on a separate Pi?

I've also had Pi #1 lock up a couple of times - couldn't open a SSH session and had to do a hard reset. Wondering why this happened to #1 and not #2?

Feathers