varnish-apache-magento2

https://dzone.com/articles/how-to-configure-varnish-in-apache-with-magento-2

1) Install Varnish on Server
Connect your server using putty or terminal and run below command to install varnish
sudo apt-get install varnish

Once you install varnish you can check installed varnish version by running below command
varnishd -V

2) Configure Varnish in Magento
Step 1

Login to Magento admin panel 
Go to stores > Configuration > General > Web > Base URLs (Secure)  
Change the Offloader header to X-Forwarded-Proto from SSL_OFFLOADED and save the configuration
Step 2

Go to Stores -> Configuration -> Advanced -> System -> Full Page Cache
Change the Caching Application to Varnish Cache (Recommended) from the Built-in Cache.
Flush Magento cache
3) Add Varnish.vcl on Server
Login to ssh with root user and Rename the file [MAGENTO_ROOT]/var/varnish.vcl to [MAGENTO_ROOT]/var/default.vcl
Go to the location of varnish by the following command
cd /etc/varnish/

Take the backup of the original default.vcl, file, and put the default.vcl file which is exported from Magento.
mv default.vcl default.vcl.original

mv /var/www/html/magento/var/default.vcl.

4) Check DAEMON_OPTS
Open the /etc/default/varnish, locate for the DAEMON_OPTS. It should display like below
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DAEMON_OPTS=”-a :80 \
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T localhost:6082 \
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f /etc/varnish/default.vcl \
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p thread_pool_min=1 \
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p thread_pool_max=1500 \
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p http_resp_hdr_len=42000 \
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p http_resp_size=98304 \
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S /etc/varnish/secret \
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s malloc,768m”




5) Change Varnish Port From 6081 to 80
To change the varnish port from 6081 to 80, we need to edit the system service configuration as follows:
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Sudo nano /etc/systemd/system/multi-user.target.wants/varnish.service




The above command will open a file in which you need to find the line as below:
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ExecStart=/usr/sbin/varnishd -j unix,user=vcache -F -a :6081 -T 127.0.0.1:6082 -f
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/etc/varnish/default.vcl -S /etc/varnish/secret -s malloc,256m




And comment it with the hash symbol as below:
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#ExecStart=/usr/sbin/varnishd -j unix,user=vcache -F -a :6081 -T 127.0.0.1:6082 -f
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/etc/varnish/default.vcl -S /etc/varnish/secret -s malloc,256m




Below this line, add a line as following:
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ExecStart=/usr/sbin/varnishd -j unix,user=vcache -F -a :80 -T 127.0.0.1:6082 -f
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/etc/varnish/default.vcl -S /etc/varnish/secret -s malloc,1536m




6) Change the Apache Listening Port From 80 to 8080
● Open the Apache ports configuration file and change it as follows:

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Nano /etc/apache2/ports.conf
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Listen 80 -> Listen 8080
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Nano /etc/apache2/sites-available/magento.conf
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<VirtualHost *:80> -> <VirtualHost *:8080>




7) Restart Varnish and Apache Service
Now we need to run following commands for restart varnish and apache service and also for check their status:
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sudo systemctl daemon-reload
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sudo service apache2 restart
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sudo service apache2 status
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sudo service varnish restart
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sudo service varnish status




You can check the ports by the following command:
sudo netstat -ltnp | grep :80

8) Configure Varnish for the HTTPS or SSL
To make the varnish work with the HTTPS or SSL, you need to do reverse proxy. For reverse proxy you must enable the following modes:
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sudo a2enmod SSL
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sudo a2enmod proxy
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sudo a2enmod proxy_balancer 
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sudo a2enmod proxy_http




To enable reverse proxy to do as follows:
sudo nano /etc/apache2/sites-available/magento-ssl.conf

Locate the SSLEngine on and paste the following lines before the SSLEngine on
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ProxyPreserveHost On
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ProxyPass / http://127.0.0.1:80/
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RequestHeader set X-Forwarded-Port “443”
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RequestHeader set X-Forwarded-Proto “https”




Restart the apache by this command:
sudo service apache2 restart

Also, check the status of apache by this command:
sudo service apache2 status

9) Verify Varnish Cache Is Working or Not
To verify varnish is working or not, you can check it by the following command:
curl -I -v –location-trusted ‘https://www.example.com’

Using the below command will provide you with an updating list of URL requests going to the back-end (Misses).
varnishtop -i BereqURL

The below command will provide you with an updated list of ALL requests.
Varnishtop -i ReqURL

10) How to Remove (Uninstall) Varnish?
Sudo apt-get purge –auto-remove varnish
In apache and conf file, change the port to 80 as it was there before.
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nano /etc/apache2/ports.conf
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Listen 8080 -> Listen 80
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nano /etc/apache2/sites-available/magento.conf
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<VirtualHost *:8080> -> <VirtualHost *:80>
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sudo service apache2 restart


for correct purge check
varnishlog -g request -q 'ReqMethod eq "PURGE"'

and use cache:flush to see output - if status 200 everything works - if not allowed set purge host with server ip