Varnish Cache is really, very fast and handles request at high speed. It typically speeds up delivery with a factor of 300 – 1000x, depending on your architecture.<\/p>\n\n\n\n
![\"\"](\"https:\/\/pheonixsolutions.com\/blog\/wp-content\/uploads\/2019\/05\/Screen-Shot-2019-05-01-at-5.51.52-PM.png\")
Varnish Cache webserver as Frontend and Apache webserver as backend<\/figcaption><\/figure><\/li><\/ul>\n\n\n\n prerequisite<\/h3>\n\n\n\n
- However, we need server running CentOS 7 with Apache installed with any version.<\/li><\/ul>\n\n\n\n
Procedure for installation of Varnish<\/h3>\n\n\n\n
Before installing Varnish in your server, you will have to install the EPEL repository.<\/p>\n\n\n\n
sudo yum install -y epel-release<\/code><\/pre>\n\n\n\nFor instance, install varnish in server<\/p>\n\n\n\n
yum install -y varnish<\/code><\/pre>\n\n\n\nAfter installation, you will need to start Varnish and enable it to start on boot.<\/p>\n\n\n\n
sudo systemctl start varnish\nsudo systemctl enable varnish<\/code><\/pre>\n\n\n\nMoreover, check the status of Varnish.<\/p>\n\n\n\n
sudo systemctl status varnish<\/code><\/pre>\n\n\n\nLikewise, check the version of Varnish <\/p>\n\n\n\n
sudo varnishd -V<\/code><\/pre>\n\n\n\nConfiguration of Varnish setup<\/h3>\n\n\n\n
The default varnish configuration file will be located in the
\/etc\/varnish<\/strong><\/code>\u00a0<\/strong>directory in CentOS 7.
To make Varnish work in front of Apache, you will need to set up some basic configurations like given details below.<\/p>\n\n\n\nBy default Varnish listens on\u00a0
port 6081<\/strong><\/code>. Use network tools such as netstat for confirmation.
You will need to change port6081<\/code>\u00a0to\u00a080<\/code>\u00a0so that website requests access the Varnish cache first<\/strong>. Similarly, you can do this by editing thevarnish.params<\/strong><\/code>\u00a0config file.<\/p>\n\n\n\nsudo nano \/etc\/varnish\/varnish.params\n<\/pre>\n\n\n\n
Change VARNISH_LISTEN_PORT<\/strong>\u00a0from\u00a0
6081<\/code>\u00a0to\u00a080<\/code>:<\/p>\n\n\n\nVARNISH_LISTEN_PORT=80\n<\/pre>\n\n\n\n
Save the file, then open the\u00a0
default.vcl<\/strong><\/code>\u00a0file. This file tells varnish to look for the server content:<\/p>\n\n\n\nsudo nano \/etc\/varnish\/default.vcl\n<\/pre>\n\n\n\n
All the above, update the Varnish to get the content on port
8080<\/code>.<\/p>\n\n\n\nbackend default {\n.host = \"127.0.0.1\";\n.port = \"8080\";\n}<\/pre>\n\n\n\nConfigure Apache [backend] To Work With Varnish<\/h3>\n\n\n\n
By default Apache listens on port\u00a0
80<\/strong><\/code>.
Similarly in the vein, you need to make Apache to run behind Varnish caching<\/strong> by changing the default Apache port to8080<\/code>.<\/p>\n\n\n\nTo do this, edit the\u00a0
httpd.conf<\/code> config file of Apache:<\/p>\n\n\n\nsudo nano \/etc\/httpd\/conf\/httpd.conf\n<\/pre>\n\n\n\n
Search for\u00a0
Listen 80<\/strong><\/code>\u00a0and replace it with\u00a0Listen 8080<\/strong><\/code>:<\/p>\n\n\n\nListen 8080\n<\/pre>\n\n\n\n
Save and close the file, restart Apache and Varnish to reflect the changes in port.<\/p>\n\n\n\n
sudo apachectl restart\nsudo systemctl restart varnish\n<\/pre>\n\n\n\n
Test the web severs<\/h3>\n\n\n\n
Now we have successfully configured Varnish and Apache running together.
To verify that Varnish is on and working, you can use thecurl<\/strong><\/code>command<\/strong> to view the HTTP header:<\/p>\n\n\n\ncurl -I http:\/\/localhost\n<\/pre>\n\n\n\n
- However, we need server running CentOS 7 with Apache installed with any version.<\/li><\/ul>\n\n\n\n