I will do install Varnish: Open Source http Cache Server on Linux

varnish.sh

# If you need to install Varnish: Open Source http Cache Server on your ubuntu then contact with me:

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## Prerequisites ##
# Ubuntu 18.04 LTS
# Root privileges

# Step 1 - Install Apache Web server
# To start, install the Apache web server, Update the Ubuntu repository and then install Apache using the apt command.
sudo apt update -y
sudo apt-get upgrade -y 
sudo apt install build-essential checkinstall
sudo apt install ubuntu-restricted-extras
sudo apt install software-properties-common
sudo apt upgrade -o APT::Get::Show-Upgraded=true
sudo apt-show-versions | grep upgradeable
sudo apt install apt-show-versions
sudo apt update -y
sudo apt-get upgrade -y

# After the installation is complete, start the Apache service and enable it to run automatically at system boot time using the following systemctl commands.
systemctl start apache2
systemctl enable apache2

# Next, to allow everyone access to the web server, we must allow HTTP and HTTPS on our firewall rule.
# By default, Ubuntu comes with a firewall package named UFW.
# Open new SSH, HTTP and HTTPS ports using the following UFW commands.

ufw allow ssh
ufw allow http
ufw allow https

# Now start the firewall service and enable it to launch automatically at system boot.
ufw enable

# If you want to test the Apache web server, you can use the netstat command and make sure apache is running under port 80.
netstat -plntu

# Or you can use the following curl command.
curl -I localhost:80

# Test using the curl command.
curl -I localhost:80
curl -I localhost:8080

# Make sure you get the HTTP header as shown below.
# And we still get Apache content.

# Check the varnish log using the 'varnishncsa' command.
varnishncsa

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