I serve my blog with the following WebStack:
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Debian GNU/Linux (what else)
See my sysctl.conf file
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Nginx
See my NGinx configuration
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PHP-FPM / APC
See my PHP configration
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Varnish
See my Varnish configuration
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Wordpress with the "WP Super Cache" and "Varnish HTTP Purge" plugins
Feel free to share and fork !