How to configure Varnish with Apache on Ubuntu and CentOS

Varnish is used to make a website load speedily, as the cache is stored in RAM; to lowers down the server load, specifically CPU works; and to gain more and more visitors.
It can be installed and run either on Apache or Nginx. 

Use the following steps to install and configure Varnish on CentOS.

Step–1: Get the rpm for Varnish using the following command.

rpm --nosignature -i http://repo.varnish-cache.org/redhat/varnish-3.0/el5/noarch/varnish-release/varnish-release-3.0-1.el5.centos.noarch.rpm

Step–2: Use the following command to install Varnish

yum install varnish

Step – 3: Modify or change the VARNISH_LISTEN_PORT=6081 line to port 80, use the following command: VARNISH_LISTEN_PORT=80

Step – 4: Now, you need to save the file and edit the default configuration file of Varnish. The following command is used for this purpose:  vi /etc/varnish/default.vcl

Step – 5: Transform the backend default port to port 81 rather. As a result, the backend section will be as follows:

backend default {

 .host = "127.0.0.1";

 .port = "81";

}

Step – 6: To configure Apache on port 81, edit the apache httpd.conf. For editing the file, the following command is used:

vi /etc/httpd/conf/httpd.conf

Also, modify the listen line to port 81

Step – 7: Alter or change iptables firewall to permit connections on port 81

Using the below command to edit the iptables configuration file

vi /etc/sysconfig/iptables

Before the COMMIT, the following lines needs to be added.

-A INPUT -m state --state NEW -m tcp -p tcp --dport 81 -j ACCEPT

 

-A OUTPUT -m state --state NEW -m tcp -p tcp --dport 81 -j ACCEPT

Further, save the file and after that restart iptables

service iptables restart

Step – 8: Configure SELinux to connect apache on port 81, and then restart apache

vi /etc/selinux/config

Change SELINUX=enforcing to

SELINUX=permissive

Now, save the file and restart apache with the following command

service httpd restart

Step – 9: Configure and start Varnish

chkconfig varnish on

service varnish start

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