nginx logstash output

nginx.conf

# Output json-esque output for logstash to parse easily.

http {
    # ...
    
    log_format logstash_json '{"@timestamp": "$time_iso8601", '
                          '"remote_addr": "$remote_addr", '
                          '"remote_user": "$remote_user", '
                          '"body_bytes_sent": "$body_bytes_sent", '
                          '"request_time": "$request_time", '
                          '"status": "$status", '
                          '"request": "$request", '
                          '"request_method": "$request_method", '
                          '"http_referer": "$http_referer", '
                          '"http_x_forwarded_for": "$http_x_forwarded_for", '
                          '"http_x_real_ip": "$http_x_real_ip", '
                          '"upstream_response_time": "$upstream_response_time"'
                          '}';
    
    access_log /var/log/nginx/access.log logstash_json;
}