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Install and configure Varnish

sudo apt-get install varnish -y 
sudo systemctl start varnish
sudo systemctl enable varnish

netstat -plntu
netstat -nlpt
netstat -tulpn

sudo systemctl daemon-reload
sudo systemctl restart varnish
sudo systemctl restart nginx

sudo systemctl status varnish

[By default, Varnish is configured to listen on port 6081 for public access and 6082 for the backend]

sudo apt-get remove varnish -y 
sudo apt-get remove --auto-remove varnish
sudo apt-get purge varnish  -y 
sudo apt-get purge --auto-remove varnish
whereis varnish
sudo rm -rf /etc/varnish/
sudo apt clean
sudo apt autoremove

Config Magento Admin

From your Magento Admin dashboard click on the

STORES==> Configuration -> ADVANCED -> System -> ==> select Varnish Cache (Recommended)==>save the configuration, 
click on the Varnish Configuration link and click on the Export VCL for Varnish 4 button.
The varnish.vcl file which we will use will be exported in the directory /var/www/magento.lan/var/.

php bin/magento cache:flush

- Delete the /etc/varnish/default.vcl and symlink it to the exported varnish configuration.
sudo rm -f /etc/varnish/default.vcl
sudo ln -sf /var/www/html/magento.lan/var/varnish.vcl /etc/varnish/default.vcl

Varnish with NGINX

  • Now we need to change Nginx listening port from 80 to 8080 and enable Nginx SSL termination with HTTP2, to do that open the Nginx configuration file and change it as follows:

      sudo nano /etc/nginx/sites-available/magento.lan

  upstream fastcgi_backend {
    server   unix:/run/php/php7.0-fpm.sock;
  }

  server {
      server_name myMagentoSite.com www.magento.lan;
      listen 8080;
      set $MAGE_ROOT /var/www/magento.lan;
      set $MAGE_MODE production; # or developer

      access_log /var/log/nginx/magento.lan-access.log;
      error_log /var/log/nginx/magento.lanm-error.log;

      include /var/www/magento.lan/nginx.conf.sample;        
  }

  server {

      listen 443 ssl http2;
      server_name magento.lan www.magento.lan;

      ssl_certificate /etc/ssl/certs/ssl-cert-snakeoil.pem; # change with your SSL cert
      ssl_certificate_key /etc/ssl/private/ssl-cert-snakeoil.key; # change with your SSL key
      ssl_protocols              TLSv1 TLSv1.1 TLSv1.2;
      ssl_ciphers               'AES128+EECDH:AES128+EDH:!aNULL';
      ssl_session_cache    shared:SSL:10m;
      ssl_session_timeout 24h;
      keepalive_timeout 300s;

      location / {
  	proxy_pass http://127.0.0.1;
  	proxy_set_header Host $http_host;
  	proxy_set_header X-Forwarded-Host $http_host;
  	proxy_set_header X-Real-IP $remote_addr;
  	proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  	proxy_set_header Ssl-Offloaded "1";
  	proxy_set_header      X-Forwarded-Proto https;
  	proxy_set_header      X-Forwarded-Port 443;
  	#proxy_hide_header X-Varnish;
  	#proxy_hide_header Via;
  	proxy_set_header X-Forwarded-Proto $scheme;

      }

  }
  


  sudo systemctl restart nginx
  sudo systemctl restart varnish 
  php bin/magento setup:store-config:set --base-url="http://www.magento.lan"
  php bin/magento setup:config:set --http-cache-hosts=127.0.0.1:8080	
  php bin/magento cache:flush
  
  
  magento setup:config:set   \
  --db-ssl-key=""  \
  --db-ssl-cert=""  \
  --db-ssl-ca=/path/tho/ca.pem  \
  --db-ssl-verify  \
  --session-save=db

Check/Test Varnish

varnishncsa 
varnishlog
varnishd -V
varnishhist

Final verification

Now that you’re using the default.vcl generated for you by Magento, you can perform some final verifications to make sure Varnish is working. Verify HTTP response headers Use curl or another utility to view HTTP response headers when you visit any Magento page in a web browser.First, make sure you are using Magento’s developer mode; otherwise, you won’t see the headers.

curl -I http://www.magento.lan
curl -k -I http://www.magento.lan
curl -I http://www.magento.lan:80
curl -I http://www.magento.lan:8080
curl -I http://www.magento.lan:8081

curl -I -v --location-trusted 'http://www.magento.lan'
curl -I -v --location-trusted 'http://www.magento.lan/' > /dev/null | grep X-Magento

X-Magento-Cache-Control: max-age=86400, public, s-maxage=86400
Age: 0
X-Magento-Cache-Debug: MISS

[This value is also acceptable: X-Magento-Cache-Debug: HIT]


rm -rf  var/page_cache/* 

Check the var/page_cache/ directory.If the directory is empty, congratulations!

Clear Varnish Cache

  1. Clear Varnish Cache with Magento 2 If you set varnish backend port and hosts correctly in Magento settings as described above in this article, then when you clean, flush, or refresh the Magento cache, Varnish purges as well. How Magento cache clearing works with Varnish

  2. Clear entire Varnish Cache In order to clear entire Varnish cache, you can simply restart Varnish:

    sudo service varnish restart sudo systemctl restart varnish

3.flush the cache for a single domain in a multisite setup:

varnishadm "ban req.http.host ==http://www.magento.lan"
varnishadm -T 127.0.0.1:6082 -S /etc/varnish/secret ban "req.http.host == http://www.magento.lan && req.url == /"

This will clear cache for https://magento.lan/somepage/

Further Optimizations

To further optimize your Magento installation from you Magento admin dashboard:

  1. Go to STORES -> Configuration -> CATALOG -> Catalog -> Use Flat Catalog Category, select Yes and click Save Config.

  2. Go to STORES -> Configuration -> ADVANCED -> Developer -> JavaScript Settings and set both Merge JavaScript Files and Minify JavaScript Files to Yes and click Save Config..

  3. Go to STORES -> Configuration -> ADVANCED -> Developer -> CSS Settings and set both Merge CSS Files and Minify CSS Files to Yes and click Save Config.

  4. Consider using a CDN – Content Delivery Network Do not forget to flush the cache:

    php bin/magento cache:flush

Troubleshooting

Varnish Cache 503 Guru Meditation Error

varnishlog -q 'RespStatus == 503' -g request

#Monitor health probes
varnishlog -g raw -i backend_health

Disable varnish cache in Ubuntu, CentOS or Red Hat

In Ubuntu, we disable varnish by changing the port from 8080 to 80. in the varnish configuration file. Our Support Engineers do this by following the steps below:

1.Open /etc/varnish/default.vcl and change the .port to 80 and restart the services.

#Disable varnish cache

service varnish restart
service apache2 restart

#If our customers are using CentOS or Red Hat then we run the command below for disabling.
service varnish stop

The above command stops the varnish cache service running. And if our customer needs to uninstall varnish cache, then we do that by running the command below.

yum erase varnish

Remove varnish

service varnish stop
#CenOS
yum erase varnish
#Ubuntu
sudo apt-get remove varnish -y
sudo apt-get purge varnish

Ref: