Varnish Summit 2016

2. DEBUG
HOW-TO

3. Arianna Aondio
Field Engineer
WHO AM I?
● Email: arianna.aondio@varnish-software.com
● Twitter: aondio_
● Github: aondio

4. AGENDA
● get the data
● possible problems
● which Varnish tools
● hands-on

5. There is a sentence appearing
more than once within this
presentation.
Find out which one and win
CHOCOLATE!

6. GET THE
DATA

7. VARNISHGATHER
# wget https://raw.githubusercontent.com/varnish/varnishgather/master/varnishgather
# sudo sh ./varnishgather
gathers stats, metrics and facts about your system in a .tar.gz archive

8. Stability
Functional
Capacity
Operational
PROBLEMS
Problems

9. STABILITY
Crash, panic or something else?
Get yourself a coffee, relax,
take your time and
get your hands dirty

10. FUNCTIONAL
Code not reached?
Wrong logic or expectations?
We have tools!

11. OPERATIONAL
Low hitrate?
High response times?
We have tools!

12. CAPACITY
Cache too small?
Wrong number of threads?
We have tools!

13. TOOLS

14. VARNISH TOOLS
VARNISHTEST
VARNISHNCSA
VARNISHHIST
VARNISHTOP
VARNISHLOG
VARNISHSTAT

15. HANDS-ON

16. Q & A