Revision as of 19:24, August 23, 2014

Varnish

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Varnish is a webcache & http accelerator. Varnish will either serve cached content, or retireve content from the server, and cache it. Varnish will reduce I/O pressure from webservers.

Install

Emerge

Install www-servers/varnish

root # www-servers/varnish

Configuration

Configuration is controlled by /etc/varnish/default.vcl & /etc/conf.d/varnishd

/etc/varnish/default.vcl - varnish configuration file

vcl 4.0;
backend default {
    .host = "127.0.0.1";
    .port = "8080";
}

/etc/conf.d/varnishd - varnish configuration file

VARNISHD="/usr/sbin/varnishd"
VARNISHADM="/usr/bin/varnishadm"
CONFIGFILE="/etc/varnish/default.vcl"
VARNISHD_OPTS="-a 127.0.0.1:80"
VARNISHD_OPTS="${VARNISHD_OPTS} -u varnish -g varnish"

Varnish will fetch data from localhost:8080 and serve accelerated proxy data on localhost:80

BootService

To start varnish immediately:

root # rc-service varnishd start

To start varnish at boot:

root # rc-update add varnishd default

Verification

To verify that your traffic is going through varnish.

user $ curl -I https://www.varnish-cache.org/

Benchmarking

If your system has apache installed apache benchmark can show the power of varnish. The examples shown are running 500 requests with concurrency of 100 hits.

ab against a 3 worker cluster mode puma server

root # ab -n 500 -c 100 http://127.0.0.1:3000/index.html | grep Request

Requests per second: 110.92 [#/sec] (mean)

ab against the same server served through varnish

root # ab -n 500 -c 100 http://127.0.0.1/index.html | grep Request

Requests per second: 10268.42 [#/sec] (mean)

@@ Line 11: / Line 11: @@
 Install {{Package|www-servers/varnish}}
-<console>###i##www-servers/varnish</console>
+<console>###i## www-servers/varnish</console>
 ==Configuration==
-Configuration is controlled by /etc/varnish/default.vcl
+Configuration is controlled by /etc/varnish/default.vcl & /etc/conf.d/varnishd
 {{file|name=/etc/varnish/default.vcl|desc=varnish configuration file|body=
-# backend default {
+vcl 4.0;
-#     .host = "127.0.0.1";
+backend default {
-#     .port = "8080";
+     .host = "127.0.0.1";
-# }
+     .port = "8080";
+}
 }}
-Any traffic pointed at port 8080 will be through varnish.
+{{file|name=/etc/conf.d/varnishd|desc=varnish configuration file|body=
+VARNISHD="/usr/sbin/varnishd"
+VARNISHADM="/usr/bin/varnishadm"
+CONFIGFILE="/etc/varnish/default.vcl"
+VARNISHD_OPTS="-a 127.0.0.1:80"
+VARNISHD_OPTS="${VARNISHD_OPTS} -u varnish -g varnish"
+}}
+Varnish will fetch data from localhost:8080 and serve accelerated proxy data on localhost:80
 == BootService ==
 To start varnish immediately:
-<console>###i##rc-service varnishd start</console>
+<console>###i## rc-service varnishd start</console>
 To start varnish at boot:
-<console>###i##rc-update add varnishd default</console>
+<console>###i## rc-update add varnishd default</console>
 == Verification ==
 To verify that your traffic is going through varnish.
-<console>$##i##curl -I https://www.varnish-cache.org/</console>
+<console>$##i## curl -I https://www.varnish-cache.org/</console>
+== Benchmarking ==
+If your system has apache installed apache benchmark can show the power of varnish.  The examples shown are running 500 requests with concurrency of 100 hits.
+ab against a 3 worker cluster mode puma server
+<console>###i## ab -n 500 -c 100 http://127.0.0.1:3000/index.html | grep Request</console>
+Requests per second:    110.92 [#/sec] (mean)
+ab against the same server served through varnish
+<console>###i## ab -n 500 -c 100 http://127.0.0.1/index.html | grep Request</console>
+Requests per second:    10268.42 [#/sec] (mean)
 [[Category:Server]]

Difference between revisions of "Package:Varnish"