#v3rp #v3rp_tokyo #tokyovcl

1. TDD VCL
@hmsk
2011/06/18

2. @hmsk
Kengo Hamasaki / @hmsk / id:hxmasaki
Varnish2.1.5
Varnish, Maatkit, Android, DevOps

4. VCL

5. VCL
Varnish Configuration Language
VCL -> C -> Binary
varnishd
1
...etc

6. http://www.varnish-cache.org/trac/wiki/VarnishInternals

7. http://www.varnish-cache.org/trac/wiki/VarnishInternals

8. http://www.varnish-cache.org/trac/wiki/VarnishInternals

9. sub vcl_fetch {
unset beresp.http.Set-Cookie;
if (!beresp.cacheable) {
return (pass);
} else if (beresp.status > 200) {
set beresp.ttl = 0m;
} else {
set beresp.ttl = 1h;
}
return (deliver);
}
http://www.varnish-cache.org/trac/wiki/VarnishInternals

10. ...?

12. VCL

13. VCL <-

14. VCL <-

15. VCL <-
<-

16. VCL <-
Message from VCC-compiler:
Expected an action, 'if', '{' or '}'
('input' Line 19 Pos 5)
purge_url(req.url);
<-
----#########----------
Running VCC-compiler failed, exit 1

17. VCL <-
<-
<-

18. VCL <-
log "[purge]" req.url;
log "[pipe]"req.url;
log "[hit]"req.url;
<-
log "[miss]"req.url;
log "[healthcheck-fail-OtherVarnish!]"req.url;
<-

19. VCL <-
<-
<-

20. We need Tests !

21. bin/varnishtest

22. bin/
varnishtest varnishncsa
varnilog varnishsizes
varnishreplay varnishtest
varnishstat
varnishtop
varnishadm
varnishhist

23. bin/
varnishtest varnishncsa
varnilog varnishsizes
varnishreplay varnishtest
varnishstat
varnishtop
varnishadm
varnishhist

24. varnishtest
VCL Varnish
Varnish (ACL)

25. varnishtest
VCL Varnish
# Start a varnish instance called "v1"
varnish v1 -arg "-b localhost:9080" -start
Varnish (ACL)

26. varnishtest
VCL Varnish
Varnish (ACL)

27. varnishtest
# Create a server thread called "s1"
VCL server s1 {
Varnish
# Receive a request
rxreq
Varnish # Send a standard response (ACL)
txresp -hdr "Connection: close" -body "012345n"
}
# Start the server thread
server s1 -start

28. varnishtest
VCL Varnish
Varnish (ACL)

29. varnishtest
# Create a client thread called "c1"
VCL client c1 {
Varnish
# Send a request
txreq -url "/"
Varnish # Wait for a response (ACL)
rxresp
# Insist that it be a success
expect resp.status == 200
}

30. $ varnishtest -v varnishtest.vcltest

31. TDD VCL
/

32. TDD VCL
/

33. ...!

34. VCL

35. Varnish
Mac Homebrew
$ brew install varnish3
https://gist.github.com/1027753

36. Vim (vcl.vim)
http://cvs.pld-linux.org/cgi-bin/cvsweb.cgi/packages/
vim-syntax-vcl/vcl.vim
Emacs (vcl-mode.el)
http://varnish-cache.org/svn/trunk/varnish-tools/
emacs/vcl-mode.el

38. watchr
varnishtest

39. watchr
varnishtest
[hamasaki@] # cat varnishtest.watchr
watch('(.*).vtest') { |md| system("/usr/local/bin/varnishtest -v #{md[0]}") }

40. Capistrano

41. $ cap varnish:deploy
$ cap varnish:purge
github

43. VMOD

44. VMOD
http://www.varnish-cache.org/docs/trunk/reference/vmod.html
Varnish 3.0
VCL
VCL
VMOD
VCL

45. VMOD
...
VCL
...

46. VMOD
if (req.http.Accept-Encoding) {
if (req.url ~ ".(jpg|png|gif|gz|tgz|bz2|tbz|mp3|ogg)
$") {
# No point in compressing these
unset req.http.Accept-Encoding;
} else if (req.http.User-Agent ~ "MSIE 6") {
unset req.http.Accept-Encoding;
...
} else if (req.http.Accept-Encoding ~ "gzip") {
set req.http.Accept-Encoding = "gzip";
VCL } else if (req.http.Accept-Encoding ~ "deflate") {
set req.http.Accept-Encoding = "deflate";
} else {
# unknown algorithm
unset req.http.Accept-Encoding;
}
... }

47. https://github.com/varnish/libvmod-example

49. VCL
TDD ->
VMOD

50. Thank you !
TDD VCL
@hmsk
2011/06/18