I Will Do Install Varnish On Ubuntu 20.04

varnish.sh

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##3CONFIGURE VARNISH WITH APACHE

sudo apt update
sudo apt upgrade
sudo apt install apache2
sudo ufw allow http
sudo ufw allow https
sudo nano /etc/apache2/ports.conf
##Listen 8080

sudo nano /etc/apache2/sites-available/000-default.conf

##And replace the VirtualHost line with this one:
<VirtualHost *:8080>
Save the changes and close the file.

sudo apachectl configtest
#Syntax OK
sudo systemctl restart apache2
curl -I localhost

##Replace [your-server] with the IP address of your server or the domain. You should receive an output similar to this:

HTTP/1.1 200 OK
Date: Wed, 22 Dec 2021 12:30:53 GMT
Server: Apache/2.4.41 (Ubuntu)
Last-Modified: Wed, 22 Dec 2021 12:16:42 GMT
ETag: "2aa6-5d3bb183e45b1"
Accept-Ranges: bytes
Content-Length: 10918
Vary: Accept-Encoding
Content-Type: text/html