Post on 11-May-2015
description
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 ?