Joined by Rick Nelson, Technical Solutions architect from NGINX Server Density take you though the do's and don'ts of monitoring NGINX. Critical and non critical metrics to monitor, important alerts to configure and the best monitoring tools available.

1. How to monitor:
Nginx
David Mytton
Hangout on Air - Oct 2014
blog.serverdensity.com/monitor-nginx/

2. David Mytton

4. Server Density Architecture

5. Server Density Architecture
● ~100 servers - Ubuntu 12.04

6. Server Density Architecture
● ~100 servers - Ubuntu 12.04
● 50:50 virtual/dedicated

7. Server Density Architecture
● ~100 servers - Ubuntu 12.04
● 50:50 virtual/dedicated
● 200TB/m processed data

8. Server Density Architecture
● ~100 servers - Ubuntu 12.04
● 50:50 virtual/dedicated
● 200TB/m processed data
● Nginx, Python, MongoDB

9. Key metrics
● Requests
● Connections
● Status codes
● Server performance

10. Key metrics
● Requests
● Connections

11. Key metrics
● Requests
● Connections
Vanity

12. Key metrics
● Requests
● Connections
Vanity
Benchmark!

13. ngx_http_stub_status_module
● --with-http_stub_status_module
location /basic_status {
stub_status;
}

14. ngx_http_stub_status_module
● --with-http_stub_status_module
Active connections: 291
server accepts handled requests
16630948 16630948 31070465
Reading: 6 Writing: 179 Waiting: 106
accepts should == handled

15. Key metrics
● Status codes

16. Status codes
● 2xx = Success
● 3xx = Redirect
● 4xx = Client error
● 5xx = Server error

17. Status codes
● Mostly 2xx/3xx
● Sudden spikes?

18. Status codes
server {
access_log /var/log/nginx/access_log combined;
...
}

19. Status codes
tail -f /var/log/nginx/access_log

20. Status codes
$ ngxtop
running for 411 seconds, 64332 records processed: 156.60 req/sec
Summary:
| count | avg_bytes_sent | 2xx | 3xx | 4xx | 5xx |
|---------+------------------+-------+-------+-------+-------|
| 64332 | 2775.251 | 61262 | 2994 | 71 | 5 |
github.com/lebinh/ngxtop

21. Key metrics
● Server performance

22. Server performance
● CPU / load average
● Networking (connections)

23. Server Density

24. ngx_http_status_module
● Nginx+
demo.nginx.com/status.html

25. ngx_http_status_module
● Server Density Plugin
● Monitor backends, status
codes, requests
● Recommended alerts
serverdensity.com/nginx/

26. Summary
● Determine baseline key metrics

27. Key metrics
● Requests
● Connections
● Status codes
● Server performance

28. Summary
● Determine baseline key metrics
● Nginx metrics + server performance

29. Summary
● Determine baseline key metrics
● Nginx metrics + server performance
● Manual tools for real time

30. Summary
● Determine baseline key metrics
● Nginx metrics + server performance
● Manual tools for real time
● Set up a monitoring product

31. Useful resources
● http://nginx.org/en/docs/http/ngx_http_stub_status_module.html
● http://nginx.org/en/docs/http/ngx_http_status_module.html
● https://blog.serverdensity.com/monitor-nginx
● https://www.serverdensity.com/plugins/nginx

32. どもありがとうございます
＠davidmytton
david@serverdensity.com
blog.serverdensity.com