Dx3webs Knowledge Base - How do I use varnish

1) Configure firewall to work with Docker

There is 1 step to ensure that CSF works with docker (this should only be done once)

Edit : /etc/csf/csfpost.sh

vi /etc/csf/csfpost.sh

add a single line

service docker restart

From an SSH terminal run

chmod +x /etc/csf/csfpost.sh
csf -a 172.17.0.0/16
sudo systemctl daemon-reload
sudo systemctl restart docker
sudo csf -r

2) Configure varnish

Make a directory for the varnish configuration file

mkdir /etc/varnish-live

Create the default.vcl file

vi /etc/varnish-live/default.vcl

Paste the attached default.vcl text. Edit the (two instance of) xxx.xxx.xxx.xxx and replace with the IP your site is attached to.

3) Create docker container

Ensure docker is installed from the Plesk extension catalog

Using the search bar enter "varnish"

from the Official Varnish docker image select the version you require based on this table.

Give the container a suitable name eg varnish-live varnish-staging

Tick "Automatically start after system reboot"

Untick " Automatic port mapping "

map the ports to a set that have not been used eg 32780 / 32781

Set "Volume mapping" to /etc/varnish | /etc/varnish-live (to match the setting above)

Set "VARNISH_SIZE" to a suitable figure for the size of your site eg 1G

Click OK

If everything is correct the container should start up.

3) Configuring magento

To ensure this works you will need to make 2 changes to your code base

index.php (and or pub/index.php) insert after <?php

$_SERVER['HTTPS']='on';

.htaccess (and or pub/.htaccess) insert at the top of the file

SetEnvIf X-Forwarded-Proto https HTTPS=on

4) Configure Plesk

Ensure that

Permanent SEO-safe 301 redirect from HTTP to HTTPS is OFF (you will get a redirect loop other wise)

5) Activate Varnish

Click the Docker Proxy Rules icon >> add rule >> Select the container you created >> OK

Traffic is now flowing through varnish.

6) Configure Magento to use Varnish

/opt/plesk/php/7.4/bin/php bin/magento config:set --scope=default --scope-code=0 system/full_page_cache/caching_application 2

(and to use redis as level 1 cache)

/opt/plesk/php/7.4/bin/php bin/magento setup:config:set --cache-backend=redis --cache-backend-redis-server=/var/run/redis/redis-server.sock  --cache-backend-redis-db=0

7) Tell magento where to flush cache

/opt/plesk/php/7.4/bin/php bin/magento setup:config:set --http-cache-hosts=xxx.xxx.xxx.xxx:zzzzz

Where zzzzz is the port used in step 3.

8) View varnish stats

Run (as root)

docker ps

This will give you the ID of your container.

docker exec -it xxxxxxxxxxxx bash

You are now logged into the container

varnishstat

You can now see your varnish stats in real time