Setup Varnish on Port 80

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Sometimes you need to quickly setup Varnish, usually in an emergency (like, your website got featured on Reddit’s frontpage 😀 ), to quickly absorb most of the hits hitting your website.

But the webserver is already using port 80.
Now what ?

Pretty easy actually :

Setup Varnish on other port, say, 6081
Run an iptables command : to forward incoming traffic from port 80 to port 6081
Make sure Varnish uses 127.0.0.1:80 as the backend

Presto – now all the traffic hits Varnish first – which will process them in lightning speed.

Alright, so here’s the gory detail, also available on Pastebin.com : https://pastebin.com/2UBD7s05

Enjoy !

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apt-get update ; apt-get -y install varnish
# Varnish should be already configured to list on port 6081

# if in doubt, check /etc/default/varnish,

# and look for the following line :

#       DAEMON_OPTS="-a :6081
# edit varnish config

vi /etc/varnish/default.vcl
# make sure the .port line is set to 80, like this :

#       .port = "80";

# then save & exit
# enable Apache's expires & headers module

a2enmod  expires

a2enmod  headers
# setup caching for static files

# via .htaccess file

echo "Header unset ETag" >> /var/www/.htaccess

echo "FileETag None" >> /var/www/.htaccess

echo "<ifmodule mod_expires.c>" >> /var/www/.htaccess

echo "<filesmatch \"(?i)^.*\\.(ico|flv|jpg|jpeg|png|gif|js|css)$\">" >> /var/www/.htaccess

echo "ExpiresActive On" >> /var/www/.htaccess

echo "ExpiresDefault \"access plus 2 minute\"" >> /var/www/.htaccess

echo "</filesmatch>" >> /var/www/.htaccess

echo "</ifmodule>" >> /var/www/.htaccess
# enable caching in php.ini

vi /etc/php/7.0/apache2/php.ini
# make sure session.cache_limiter = public

# save & exit
# restart Apache

/etc/init.d/apache2 restart
###### now let's start forwarding traffic to Varnish ######
# enable port forwarding

echo 1 > /proc/sys/net/ipv4/ip_forward

vi /etc/sysctl.conf
# add this line at the end of the file :

# net.ipv4.ip_forward = 1
# now here's the command that will actually forward the traffic from port 80 to Varnish

# change eth0 to your computer's network interface name

iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 6081
# make sure this iptables setting will become permanent

apt-get -y install iptables-persistent

20 thoughts on “Setup Varnish on Port 80”

Now here’s the command that will actually forward the traffic from port 80 to Varnish.

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This entry was posted on Sunday, February 18th.

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lieur bray euy

Cool bro, i will follow step by step your instruction
Thanks for your info
Felix Andika

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