Setup Varnish on Port 80

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 !

========


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.

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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