Let's customize logging of reverse proxy or time to check response time of application in real time.

Hi wonderful community!

 

So at the moment, a lot of companies understood WFH (working from home) is efficient for the productivity and services should much faster. Hence I will share typical use cases for investigating the slowness because the first thing is to measure the response time:

image.png

Today I would like to share some easy trick related to the configuration related to the reverse proxy which is used by the mostly on-premises setup of Atlassian product.

 

  • Let’s start from popular nginx:

             $upstream_response_time - keeps time spent on receiving the response from the upstream server; the time is kept in seconds with millisecond resolution. Times of several responses are separated by commas and colons like addresses in the $upstream_addr variable. 

Detailed info: https://nginx.org/en/docs/http/ngx_http_upstream_module.html

             $request_time - request processing time in seconds with a milliseconds resolution; time elapsed between the first bytes were read from the client and the log write after the last bytes were sent to the client. 

Detailed info: https://nginx.org/en/docs/http/ngx_http_log_module.html

 

Actually, I used 2 additional formats with next variables appmon, appmon_detailed: 

http {

...

log_format  main '$remote_addr - $remote_user [$time_local] "$request" '

                      '$status $body_bytes_sent "$http_referer" '

                      '"$http_user_agent" "$http_x_forwarded_for"';

log_format appmon '[$time_local] $remote_addr - $remote_user "$request" $status $body_bytes_sent $request_length "$http_referer" "$http_user_agent" $request_time $upstream_response_time';

log_format appmon_detailed '[$time_local] $remote_addr - $remote_user "$request" $status $body_bytes_sent $request_length "$http_referer" "$http_user_agent" $request_time $upstream_response_time $request_body';

server {

     ....

     access_log /var/log/nginx/jira.example.com.ssl.access.log appmon;

     …

So for how we can investigate the logs, if you don’t have log analyzer yet? Please, check the next command which is monitor query longer than 10sec.

tail -f -n10000  /var/log/nginx/jira.example.com.ssl.access.log |  awk '$NF>10'

 

As result you can see result like this, e.g. is’t problem with one of gadget: 

[08/Apr/2020:20:24:40 +0200] 10.10.10.236 - - "GET /rest/gadget/1.0/favfilters?showCounts=true&_=1586370267431 HTTP/2.0" 499 0 66 "https://jira.example.com/secure/Dashboard.jspa" "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.163 Safari/537.36" 11.544 11.543

Link to exporter Prometheus: https://github.com/nginxinc/nginx-prometheus-exporter

 

  • httpd (Apache HTTP server)            

            %D - The time taken to serve the request, in microseconds. 

                    or you can use that one

            %T - The time taken to serve the request, in seconds.

           Detailed info: http://httpd.apache.org/docs/current/mod/mod_log_config.html 

And you can adjust the log format in httpd.conf usign the below example:

LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\" %D"

Link to exporter: https://github.com/Lusitaniae/apache_exporter

 

  • HAProxy 

           Reference: https://www.haproxy.com/blog/exploring-the-haproxy-stats-page/

          If you do monitoring let’s use that exporter https://github.com/prometheus/haproxy_exporter

 

  • Varnish

that’s app pretty awesome software to do caching, next time I will how to do for the one of software of Atlassian suite. 

 

Hope it helps.

I will be happy if you add some comments and I will be happy if you provide what kind of reverse proxy do you use.

Cheers,

Gonchik Tsymzhitov

2 comments

LarryBrock
Community Leader
Community Leader
Community Leaders are connectors, ambassadors, and mentors. On the online community, they serve as thought leaders, product experts, and moderators.
April 9, 2020

Thanks for the great tips on performance monitoring @Gonchik Tsymzhitov !  With more employees working in a distributed state, information like this is very useful.

Like Gonchik Tsymzhitov likes this
Gonchik Tsymzhitov
Community Leader
Community Leader
Community Leaders are connectors, ambassadors, and mentors. On the online community, they serve as thought leaders, product experts, and moderators.
April 26, 2020

@LarryBrock  My pleasure

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