Difference between pages "Package:Apache-tools" and "Package:Varnish"

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m (remove toc, link to apache-tools, change curl -I to reflect funtoos use of varnish.)
 
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{{Ebuild
{{Ebuild
|Summary=Useful Apache tools - htdigest, htpasswd, ab, htdbm
|Summary=Varnish is a state-of-the-art, high-performance HTTP accelerator
|CatPkg=app-admin/apache-tools
|CatPkg=www-servers/varnish
|Maintainer=
|Maintainer=
|Homepage=http://httpd.apache.org/
}}
}}
<console>###i## emerge apache-tools</console>
'''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.


Apache benchmark tests webserver performance.  This polite test will show 5 requests with the concurrency level of 5 hits at once:
==Install==
===Emerge===


<console>###i## ab -n 5 -c 5 http://www.funtoo.org/Welcome
Install {{Package|www-servers/varnish}}:
This is ApacheBench, Version 2.3 <$Revision: 1604373 $>
<console>###i## emerge www-servers/varnish</console>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/


Benchmarking www.funtoo.org (be patient).....done
==Configuration==


{{note|as your varnish is local to your server, your server needs to be aware that it is behind a proxy, and configured for [http://en.wikipedia.org/wiki/X-Forwarded-For x-forwarded-for] or similar to fetch real users ip addresses instead of displaying 127.0.0.1 or localhost.}}


Server Software:        nginx
Configuration is controlled by /etc/varnish/default.vcl & /etc/conf.d/varnishd
Server Hostname:        www.funtoo.org
Server Port:            80


Document Path:         /Welcome
{{file|name=/etc/varnish/default.vcl|desc=varnish configuration file|body=
Document Length:       32731 bytes
vcl 4.0;
backend default {
    .host = "127.0.0.1";
    .port = "8080";
}
}}
 
{{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
 
=== c10k ===
For 10,000 concurrent connections (or not) a few configuration settings control the power of varnish.  If you're having varnish directly serve to the outside world, dial back concurrency to say 50 or 100 connections per ip. You must take into account corporations, and universities hammering several connections from a singular ip.  c10k is useful information for if varnish is behind a load balancer such as pound, nginx, or tengine, and all requests are internal and local.
 
{{file|name=/etc/conf.d/varnishd|desc=varnish concurrency settings|body=
VARNISHD_OPTS="-a 127.0.0.1:80 -p thread_pool_min=20 -p thread_pool_max=1000 -p thread_pool_add_delay=2 -s malloc,700M"
}}
 
{{file|name=/etc/varnish/default.vcl|desc=varnish concurrency settings|body=
backend default {
    .host = "127.0.0.1";
    .port = "8080";
    .connect_timeout = 600s;
    .first_byte_timeout = 600s;
    .between_bytes_timeout = 600s;
    .max_connections = 10000;
    # .port = "80" led to issues with competing for the port with apache.
}
}}
 
== BootService ==
 
To start varnish immediately:
<console>###i## rc-service varnishd start</console>
 
To start varnish at boot:
<console>###i## rc-update add varnishd default</console>
 
== Verification ==
To verify that your traffic is going through varnish.
<console>$##i## curl -I http://www.funtoo.org/Welcome</console>
 
== Benchmarking ==
{{package|app-admin/apache-tools}} 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)


Concurrency Level:      5
== SSL support ==
Time taken for tests:  0.419 seconds
Varnish does not support ssl. There are packages to get around this limitation:
Complete requests:      5
* {{package|stunnel}}
Failed requests:       0
* {{package|pound}}
Total transferred:      165849 bytes
HTML transferred:      163655 bytes
Requests per second:    11.94 [#/sec] (mean)
Time per request:      418.790 [ms] (mean)
Time per request:      83.758 [ms] (mean, across all concurrent requests)
Transfer rate:          386.74 [Kbytes/sec] received


Connection Times (ms)
== Media ==
              min  mean[+/-sd] median  max
{{#widget:YouTube16x9|id=JEF6_XC-2ZU}}
Connect:      60  63  2.7    63      67
Processing:  300  317  23.3    314    356
Waiting:      78  92  10.6    96    105
Total:        361  380  24.0    378    419


Percentage of the requests served within a certain time (ms)
  50%    370
  66%    387
  75%    387
  80%    419
  90%    419
  95%    419
  98%    419
  99%    419
100%    419 (longest request)
</console>
{{EbuildFooter}}
{{EbuildFooter}}

Revision as of 07:07, November 27, 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 # emerge www-servers/varnish

Configuration

   Note

as your varnish is local to your server, your server needs to be aware that it is behind a proxy, and configured for x-forwarded-for or similar to fetch real users ip addresses instead of displaying 127.0.0.1 or localhost.

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

c10k

For 10,000 concurrent connections (or not) a few configuration settings control the power of varnish. If you're having varnish directly serve to the outside world, dial back concurrency to say 50 or 100 connections per ip. You must take into account corporations, and universities hammering several connections from a singular ip. c10k is useful information for if varnish is behind a load balancer such as pound, nginx, or tengine, and all requests are internal and local.

   /etc/conf.d/varnishd - varnish concurrency settings
VARNISHD_OPTS="-a 127.0.0.1:80 -p thread_pool_min=20 -p thread_pool_max=1000 -p thread_pool_add_delay=2 -s malloc,700M"
   /etc/varnish/default.vcl - varnish concurrency settings
backend default {
    .host = "127.0.0.1";
    .port = "8080";
    .connect_timeout = 600s;
    .first_byte_timeout = 600s;
    .between_bytes_timeout = 600s;
    .max_connections = 10000;
    # .port = "80" led to issues with competing for the port with apache.
}

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 http://www.funtoo.org/Welcome

Benchmarking

app-admin/apache-tools 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)

SSL support

Varnish does not support ssl. There are packages to get around this limitation:

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Media


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