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An example vmod for Varnish http://www.varnish-cache.org/project/…
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INSTALL: ======== The source tree is based on autotools to configure the building, and does also have the necessary bits in place to do functional unit tests using the varnishtest tool. Prerequisites: - Varnish source - version 3.0.3 or previous - libpcre3-dev - libtool Usage: ./autogen.sh ./configure VARNISHSRC=DIR [VMODDIR=DIR] VARNISHSRC is the directory of the Varnish source tree for which to compile your vmod. Both the VARNISHSRC and VARNISHSRC/include will be added to the include search paths for your module. Optionally you can also set the vmod install directory by adding VMODDIR=DIR (defaults to the pkg-config discovered directory from your Varnish installation). Make targets: make - builds the vmod make install - installs your vmod in VMODDIR if VMODDIR is not on the user space do 'sudo make install' instead On your VCL configuration: import threescale; set req.http.X-tmp = threescale.send_get_request_threaded("su1.3scale.net","80",req.url,""); set req.http.X-tmp = threescale.send_get_request("su1.3scale.net","80",req.url,"X-url-header: true;"); Integration modes: Use the appropriate VCL configuration file for the integration mode you would like to follow. vcl/default_3scale_simple.vcl - Varnish as a cache middleware between your API backend and the 3scale service. vcl/default_3scale_with_proxy.vcl - Varnish as an API proxy between API consumers and your API endpoints. In this setup, Varnish will be fully in charge of the integration with the 3scale service. Replace the default config file with one of the above: sudo mv /etc/varnish/default.vcl /etc/varnish/default.vcl.bkp sudo cp libmod-3scale/vcl/default_3scale_simple.vcl /etc/varnish/default.vcl sudo /etc/init.d/varnish restart It is always advisable to check the syslog for failures while testing tail -f /var/log/syslog | egrep 'varnish'