Nginx issue with two web nodes

Posted by HTF on Server Fault See other posts from Server Fault or by HTF
Published on 2012-06-07T21:56:06Z Indexed on 2012/06/07 22:42 UTC
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nginx

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caching

I'm running Wordpress website with Nginx and Memcached. I have simple DNS round robin balancing with A records pointing to both web servers. I've noticed the following entries in both web servers access logs:

192.168.1.10 example.com - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000
192.168.1.10 example.com - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000
192.168.1.10 example.com - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000
192.168.1.10 example.com - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000
192.168.1.10 example.com - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000

I've configured W3 Total cache plugin for Wordpress - pointing to loopback address (127.0.0.1:11211) on each Wordpress installation.

Is this because the webserver is trying to access content that is cached on the other web server? Shall I add IPs to W3 plugin of both web servers on each website (192.168.1.:11211, 192.168.1.2:11211)? I'm not sure if this related to Memcached or maybe some configuration issue on the server itself?

Regards

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