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+---
+layout: post
+title: key=value logs with nginx
+date: 15.04.2014 18:24
+---
+
+In [Six Ways to Make Your Production Logs More Useful][fun-with-logs] [@roidrage][] talked about how to make your logs much more useful.
+One of the proposed solutions was to use a format that is more structured and thus easier to read: `key=value` logging.
+This way it's easy to parse for a human eye, but a machine will have no problems either.
+And of course your standard shell tools (with the combination of some basic regular expressions) will still work to find what you want in your logs.
+
+This blog and all of my other sites run on [nginx][] and with nginx it is very easy to use a custom log format.
+Just define a new `log_format`, give it a meaningful name and the layout you want. For example I use the following now:
+
+~~~shell
+log_format  keyvalue  'time=$time_iso8601 ip=$remote_addr user=$remote_user req="$request" '
+                  'status=$status bytes_sent=$body_bytes_sent req_time=$request_time ref="$http_referer" '
+                  'ua="$http_user_agent" forwarded="$http_x_forwarded_for"';
+~~~
+
+Put this in your `http {}` block and wherever you define a new access log file append `keyvalue` (or the name you have chosen) like this:
+
+~~~shell
+access_log  /var/log/nginx/access.log  keyvalue;
+~~~
+
+And voilà:
+
+~~~shell
+$ tail -1 /var/log/nginx/access.log
+time=2014-04-15T18:20:54+02:00 ip=127.0.0.1 user=- req="GET / HTTP/1.1" status=301 bytes_sent=184 req_time=0.000 ref="-" ua="curl/7.36.0" forwarded="-"
+~~~
+
+If you want to know which variables are available, read the [nginx docs][docs].
+
+
+
+[fun-with-logs]: http://blog.travis-ci.com/2014-04-11-fun-with-logs/
+[@roidrage]: https://twitter.com/roidrage
+[nginx]: http://nginx.org/
+[docs]: http://nginx.org/en/docs/http/ngx_http_log_module.html#log_format