Installing varnish in a Linux environment

Varnish is a high-performance open-source HTTP accelerator, and Norway's largest online newspaper, Verdens Gang, used 3 varnish instead of the original 12 squid for better performance than before.

sudo apt-get install varnish-y

First, delete the/etc/varnish/default.vcl file and create a symbolic link from the exported varnish configuration:

sudo rm -rf /etc/varnish/default.vclsudo ln -s /var/www/html/magento/var/varnish.vcl /etc/varnish/default.vcl

Next, you will need to create a SYSTEMD service file for varnish. You can varnish.service from/lib/systemd/system/Copy to/Etc/systemd/system/directory:

sudo cp /lib/systemd/system/varnish.service /etc/systemd/system/

After you copy the file, you will need to make some changes to the Varnish.service file:

sudo nano /etc/systemd/system/varnish.service

Make the following changes:

[Unit]Description=Varnish HTTP acceleratorDocumentation=https://www.varnish-cache.org/docs/4.1/ man:varnishd[Service]Type=simpleLimitNOFILE=131072LimitMEMLOCK=82000ExecStart=/usr/sbin/varnishd -j unix,user=vcache -F -a :80 -T localhost:6082 -f /etc/varnish/default.vcl -S /etc/varnish/secret -s malloc,256mExecReload=/usr/share/varnish/reload-vclProtectSystem=fullProtectHome=truePrivateTmp=truePrivateDevices=true[Install]WantedBy=multi-user.target

Save the file when you are finished, and then restart the varnish service by using the following command:

sudo systemctl daemon-reloadsudo systemctl reload varnish.service

If everything works, you should be able to log on to the Magento backend by entering the following URL on your Web browser:

http://192.168.15.189/admin_wczta4

You can also check whether varnish is enabled by running the following command:

curl -I http://192.168.15.189/admin_wczta4

You should see that varnish is enabled:

Date: Fri, 07 Jul 2017 17:10:01 GMTServer: Apache/2.4.18 (Ubuntu)Set-Cookie: store=default; expires=Sat, 07-Jul-2018 17:10:03 GMT; Max-Age=31536000; path=/; HttpOnlySet-Cookie: PHPSESSID=irp2k8cmrhct0dfh18qk7ap0i4; expires=Fri, 07-Jul-2017 18:10:04 GMT; Max-Age=3600; path=/; domain=192.168.15.189; HttpOnlyExpires: Thu, 07 Jul 2016 17:10:04 GMTCache-Control: max-age=0, must-revalidate, no-cache, no-storePragma: no-cacheLocation: http://192.168.15.189/admin_wczta4/?SID=irp2k8cmrhct0dfh18qk7ap0i4X-Content-Type-Options: nosniffX-XSS-Protection: 1; mode=blockX-Frame-Options: SAMEORIGINContent-Length: 0Content-Type: text/html; charset=UTF-8X-Varnish: 2Age: 0Via: 1.1 varnish-v4Connection: keep-alive

Installing varnish in a Linux environment