Varnish
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Varnish Varnish Tips and Tricks
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This presentation was done by Alexander Kuznecov, our main System Administrator about Varnish Caching during Drupal Camp Kiev 2012.
Transcript of Varnish
Varnish
VarnishTips and Tricks
Varnish
Clients Webserver
Request
HTTP-accelerator
Varnish
Clients Webserver
Request
Request
Request
HTTP-accelerator
Varnish
Clients Webserver
Request
Request
Request
Fault
HTTP-accelerator
Varnish
HTTP-accelerator
Clients Webserver
Request
Request
Request
Varnish Request
SubsequentInitial
Varnish
Flow start
recv
pass lookup
miss hit
deliver
done
fetch pipe
error
hash
Varnish
ESIPage
ESIblock
content
TTL: 60m
ESIblock
TTL: 5m
TTL: 0
Varnish
ESI
<esi:include src="/esi/region/123" />
Varnish
VMODsEssential Varnish Modules
* EXTEND FUNCTIONALITY
* DISTRIBUTION BY SOURCE CODE (C)
Varnish
Tips and Tricks
Varnish
Drupal: cache anonymousreq.http.Cookie
recv
SESS(.{32})=([^;]*)cookie
pass
Varnish
Drupal: cache anonymousreq.http.Cookie
recv
SESS(.{32})=([^;]*)cookie
pass
Varnish
Drupal: cache bothreq.http.Cookie
recv
customcookie
pass
Varnish
Tools * varnishadm
* varnishtop
* varnishstat
* varnishlog* varnishnsca
* varnishd -C -f /path/to/vcl
Varnish
Cache Invalidation
varnishadm
wget / curl(PURGE HTTP method)
+ regular expressions- access to terminal
+ remote call- single URL
Varnish restart- full cache invalidation- permissions- downtime
Varnish
Mobile User-Agentsreq.http.user-agent
recv
User Agentcondition
redirecthash
Varnish
Backendsbackend default {
.host = "192.168.0.1";
.port = "80"; }
backend other {.host = "192.168.0.33";.port = "80";
}
Varnish
ACLacl internal {
"127.0.0.1";"localhost";
}
acl admins {"192.168.1.1";"192.168.2.0/24";! "192.168.2.88";
}
Varnish
Virtual hosts
include "/etc/varnish/virtual-hosts/example.com.vcl";
sub vcl_recv {
if (req.http.Host ~ "^example.com") {
call explcom_vcl_recv; }}
Varnish
HTTP-authentication
HTTPauth
recv
pass
Varnish
HTTP-authentication
!HTTP auth header
recv
error
req.http.Authorization
Varnish
HTTP-authentication
if (! req.http.Authorization ~ "Basic Zm9vOmJhcgo="){ error 401 "Restricted";}
$ echo -n "foo:bar" | base64
Varnish
Errorif (obj.status == 400) {
set obj.http.Content-Type = "text/html; charset=utf-8";synthetic {"
<html> <head> <title>400 Bad request</title> </head> <body> <h1>Error 400 Bad request</h1> <p>Bad request</p> </body> </html>"};
return (deliver);}
Varnish
Custom error pages
* Strict HTML
* Inline C
* Combined
Methods:
Varnish
Redirects
ERROR
Varnish
Redirects recv
error
condition
customerror code
error codeaction
Varnish
GeolocationVMOD «GeoIP»
set req.http.X-Country-Code = geoip.client_country_code();
recv
GeoIP headercondition
restrictaccess
redirect
Varnish
Custom TTL
set beresp.ttl = 10m;
if (beresp.http.X-TTL) {C{char *ttl;ttl = VRT_GetHdr(sp, HDR_BERESP, "\06X-TTL:");VRT_l_beresp_ttl(sp, atoi(ttl));}C
}
Varnish
Questions ?
