Prerequisites
Nginx --with-http_sub_module <- with yum install, nginx comes with this module included.
nginx -V
nginx version: nginx/1.13.9
built by gcc 4.4.7 20120313 (Red Hat 4.4.7-18) (GCC)
built with OpenSSL 1.0.1e-fips 11 Feb 2013
TLS SNI support enabled
configure arguments: --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -pie'
```
How to set
- create a conf file with sub_filter directive
sub_filter '</head>' '<script type="text/javascript">var _gaq = _gaq || [];_gaq.push(["_setAccount", "UA-99999999-9"]);_gaq.push(["_trackPageview"]);(function() {var ga = document.createElement("script"); ga.type = "text/javascript"; ga.async = true;ga.src = ("https:" == document.location.protocol ? "https://ssl" : "http://www") + ".google-analytics.com/ga.js";var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(ga, s);})();</script></head>';
↑ replace UA-9999999-9 with appropriate UA ID
References
Add Google Analytics tracking code to HTML via nginx
https://gist.github.com/jirutka/5279057