Accelerating the web with varnish

Accelerating the web with varnish

1.1 Questions

By configuring the varnish cache server, you achieve the following objectives:

Accelerate back-end Apache Web Services with varnish

Managing cache pages with the VARNISHADM command

To view the varnish status using the Varnishstat command

1.2 Solutions

Installing the varnish cache server through source compilation

Compiling and installing varnish software

Copying startup scripts and configuration files

Modify the configuration file, cache the proxy source Web server, and implement the Web Acceleration feature

Use 3 RHEL7 virtual machines, one as a Web server (192.168.2.100), one as a varnish proxy server (192.168.4.5,192.168.2.5), Another Test Linux client (192.168.2.100) for the deployment of the Web server, this experiment only need to install httpd software, start the service, and generate a test home file, the default httpd site root path is/var/www/html, Home document name is index.html

1.3 Steps

The implementation of this case needs to follow the steps below.

Step One: Build a Web server

1) Install the Web package with Yum

[Email protected] ~]# yum-y install httpd

2) enable the HTTPD service and set it to run automatically

[Email protected] ~]# systemctl start httpd; Systemctl Enable httpd

The HTTPD service listens for client requests via TCP 80 port by default:

[Email protected] ~]# NETSTAT-ANPTU | grep httpd

TCP 0 0::: +:::* LISTEN 2813/httpd

3) Create a test file for Web Access

Create a home page file named Index.html under the site root directory/var/www/html

[Email protected] ~]# echo "This is the test page for varnish. A.. ">/var/www/html/index.html

Step two: Deploy the varnish cache server

1) Compile and install the software

[[email protected] ~]# yum-y install gcc readline-devel pcre-devel//install software dependency Package

[[email protected] ~]# useradd-s/sbin/nologin varnish//Create account

[Email protected] ~]# TAR-XZF varnish-3.0.6.tar.gz

[Email protected] ~]# CD varnish-3.0.6

[Email protected] varnish-3.0.6]#/configure--prefix=/usr/local/varnish

[[email protected] varnish-3.0.6]# make && make install

2) Copy startup scripts and configuration files

[email protected] varnish-3.0.6]# CP redhat/varnish.initrc/etc/init.d/varnish

[email protected] varnish-3.0.6]# CP redhat/varnish.sysconfig/etc/sysconfig/varnish

[Email protected] varnish-3.0.6]# ln-s/usr/local/varnish/sbin/varnishd/usr/sbin/

[Email protected] varnish-3.0.6]# ln-s/usr/local/varnish/bin/*/usr/bin/

3) Modify the varnish file

[Email protected] ~]# Vim/etc/sysconfig/varnish

66 Line: Varnish_listen_port=80 #默认端口

89 Line: varnish_storage_size=60m #定义缓存大小

92 Line: Varnish_storage= "Malloc,${varnish_storage_size}" #基于内存方式缓存

4) Modify Agent configuration file

[Email protected] ~]# Mkdir/etc/varnish

[Email protected] ~]# cp/usr/local/varnish/etc/default.vcl/etc/varnish/

[[Email protected]~]# uuidgen >/etc/varnish/secret

[Email protected] ~]# VIM/ETC/VARNISH/DEFAULT.VCL

Backend Default {

. Host = "192.168.2.100"; IP to Port-end server

. Port = "80"; Renamed Port 80

}

[Email protected] varnish-3.0.6]#/etc/init.d/varnish

Usage:/etc/init.d/varnish {start|stop|status|restart|condrestart|try-restart|reload|force-reload}//is a self-bringing script that restarts the service .. Just wait for this script to work.

Step Three: Client testing

1) client opens browser access

[Email protected] ~]# Curl http://192.168.4.5

Step four: relevant technical points

1) View varnish log

[[email protected] ~]# varnishlog//varnish Log

[[email protected] ~]# VARNISHNCSA//access log

2) Update the cached data, after the background Web server updates the content of the page, the user Access Proxy sees the previous data, indicating that the data in the cache has expired and needs to be updated (the default is automatically updated, but not in real-time updates).

[Email protected] ~]# varnishadm–s/etc/varnish/secret–t 127.0.0.1:6082

Will go into one of these pages

200

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Varnish Cache CLI 1.0

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Linux,3.10.0-327.el7.x86_64,x86_64,-smalloc,-smalloc,-hcritbit

varnish-3.0.6 Revision 1899836

Type ' help ' for command list.

Type ' quit ' to close CLI session.

Varnish> Ban.url Page file name

Ban.url Page file name

Empty cached data, support regular expressions

Accelerating the web with varnish