Installing Ushahidi on nginx is mostly the same as installing on apache, however the .htaccess file won't work so you need to put the rewrite rules in the vhost config.
Here's an example nginx ushahidi config: https://gist.github.com/3847180
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In particular, the "Ushahidi Platform v3.x" section contains information that is often misleading. Many details about this version of Platform have changed since.
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For more documentation, please refer to https://docs.ushahidi.com
Installing Ushahidi on nginx is mostly the same as installing on apache, however the .htaccess file won't work so you need to put the rewrite rules in the vhost config.
Here's an example nginx ushahidi config: https://gist.github.com/3847180